The car will not drive off the cliff.
Motion is the phenomenon in which an object changes its position. Motion is represented in terms of displacement, distance, velocity, acceleration, speed, and time.
We know that [tex]v^{2} - u^{2} = 2aS[/tex] where,
v= final velocity
u = initial velocity
a = acceleration/deacceleration
S = distance
Given , v = 32m/s , u =0 and a = 8 m/s^2
Putting these values in above equation we get,
S = 64m
Given cliff is at a distance of 65m.
So the car will not fall off the cliff.
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PLEASE HELP!! 25 POINTS!!!
Please draw or show a picture of a free body diagram of a car slowing down.
a free body diagram of a car slowing down would typically include the following elements:
The car, represented by a rectangle or square
The ground or road, represented by a horizontal line or plane
An arrow pointing downward representing the force of gravity acting on the car
An arrow pointing horizontally to the right representing the force of friction acting on the car
An arrow pointing horizontally to the left representing the applied force or deceleration of the car
The diagram would also include any other relevant forces, such as air resistance or the force of the brakes, represented by additional arrows. It is important to label each force with its magnitude and direction to understand the forces acting on the car and how they affect its motion.
Question 2 4 pts Goals that are short-term, specific, and moderately challenging lead to
O greater success
O self-actualization
O increased internal attributions.
O increased external attributions.
Short-term, precise, and moderately difficult goals are more likely to be achieved.
The current work connects goal setting to transformational leadership, whereas leading through goals is typically linked with a task-oriented leadership style. Employees participated in a two-time point online survey to learn more about how transformational leadership affects followers' commitment to the firm, work happiness, and proactive behavior. Results show that transformative leaders have an impact on how much followers value organisational goals and believe they are attainable. This objective attribute transmission of transformational leadership's impact on followers' work attitudes and proactive behaviour was discovered through many mediation analyses. Goal significance and goal attainability, however, appear to be of varying importance for the various outcomes.
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The Moon does not crash into Earth because: its in Earth's gravitational field the net force on it is zero it is beyond the main pull of Earth's gravity its being pulled by the Sun as well as by Earth none of the above
It is freely falling but it has a high tangential velocity.
The correct answer is D.
Is the net force on the moon zero?
There cannot be zero net force acting on the Moon. There will be no circular orbit since there will be no net force acting on the Moon. The motion will be carried out by the Moon.
Why does the moon not have a gravitational pull?
The gravity at the Moon's surface is about 1/6th as strong as that at Earth, or 1.6 meters per second every second. The Moon's surface gravity is weaker because it has a smaller mass than Earth. The gravity at the Moon's surface is about 1/6th as strong as that at Earth, or 1.6 meters per second every second.
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I understand that the question you are looking for is
The Moon does not crash into the Earth because:
(a) the net force on it is zero.
(b) it is beyond the main pull of the Earth's gravity.
(c) it is being pulled by the Sun as well as by the Earth.
(d) it is freely falling but it has a high tangential velocity.
8. do the earth and the moon always cast shadows? what do we call the occurrence where the earth passes within the shadow of the moon? when the moon passes within the shadow of the earth?
Yes, they both cast shadows. A eclipse occurs when one enters the shadow of the other.
Solar eclipse: Earth in shadow of Moon.
Lunar eclipse: Moon in shadow of Earth.
A solar eclipse is the result of one celestial body being completely or partially obscured by another celestial body along the line of sight of an observer. A solar eclipse occurs when the moon passes between the earth and the sun, obscuring all or part of the sun's disk. A lunar eclipse occurs when the Moon passes through the Earth's shadow, making the Moon's surface completely or partially obscured.
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suppose a ramp is used to move a heavy object into a van. suppose also that the van door is 18 inches off the ground. a.if the bottom of the ramp rests on the ground 4 feet from the van, what is the slope of the ramp?b.if the ramp cannot have a slope of more than 1.2 inches per foot, how far from the van should the ramp rest
Answer: 1/3 inch up per foot across 1/2 inch up per foot.
What is slope?
--Slope, slant mean to incline away from a relatively straight surface or line used as a reference.
--To slope is to incline vertically in an oblique direction: The ground slopes (upward or downward ) sharply here.
In above we need to find the the slope of the ramp
i.e Vandoor is 18 inch from the ground
So 4/12 = 1./3 inch up per foot
--Relative motion is the calculation of the motion of an object with regard to some other moving or stationary object.
Thus, the motion is not calculated with reference to the earth, but is the velocity of the object in reference to the other moving object as if it were in a static state.
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1/3 inch up per foot across 1/2 inch up per foot.
What is slope?Slope, slant mean to incline away from a relatively straight surface or line used as a reference. To slope is to incline vertically in an oblique direction: The ground slopes (upward or downward ) sharply here.
In above we need to find the the slope of the ramp
i.e., Van door is 18 inch from the ground
So 4/12 = 1./3 inch up per foot
Relative motion is the calculation of the motion of an object with regard to some other moving or stationary object.
Thus, the motion is not calculated with reference to the earth, but is the velocity of the object in reference to the other moving object as if it were in a static state.
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a(n) 1.21 kg sphere makes a perfectly inelastic collision with a second sphere that is initially at rest. the composite system moves with a speed equal to one-third the original speed of the 1.21 kg sphere. what is the mass of the second sphere? answer in units of kg.
The mass of the second sphere is 2.42kg when a 1.21 kg sphere makes a perfectly inelastic collision with a second sphere that is initially at rest.
Given mass of first sphere (m1) = 1.21kg
initial speed of second sphere (u2) = 0 as it is at rest
Let initial speed of first sphere = u1
let mass of second sphere = m2
speed of composite system after collision (v) = 1/3u1
We know from the conservation of momentum we have :
m1u1 = (m1+m2)v
1.21xu1 = (1.21+m2)x1/3u1
m2 = 3.63 - 1.21 = 2.42 kg
Hence the mass of second sphere = 2.42kg
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suppose that a polar bear's foot has a diameter of . what is the angular size of the foot at an angular-diameter distance of ?
3.4×10^-4 rad is the minimum possible angular size of the bear's foot.
Here, if the distance dA reaches infintiy then at such a limit the angular size will be 0.
What is angular size ?Angular size is the angle that is formed when two days meet at a single point. Angular size is the same as angular diameter.
Angular size ∅= linear size D / distance d
Calculation:For small angles Ф, the diater of the polar bear's foot will be:
l=daФ
=Ф=1/da
=Ф=0.1 /0.5×10³=3.2×10∧-4 rad
Thus, minimum possible angular size of the bear's foot will be hen the distance da approaches infinity. For such a limit, the angular size will be Ф=0
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how many coulombs of electric charge are required to deposit 25.0 g cu(s) at the cathode in the electrolysis of cuso4(aq)?
75984 coulombs of electric charge are required to deposit 25.0 g cu(s) at the cathode in the electrolysis of cuso4(aq)
The molar. mass of Cu. is 63.5 g/mol
25.0 g Cu corresponds to 25/63.5 = 0.3937 mol
Cu ²+ + 2e- → Cu
1 mole of Cu is deposited by 2 moles of electrons.
0.3937 moles of Cu is deposited by 2 × 0.3937 = 0.7874 moles of electrons.
Coulombs of electric charge required = 0.7874 × 96500 = 75984 coulombs
A promising method for producing carbon-free hydrogen from nuclear and renewable sources is electrolysis. Water is split. into hydrogen. and oxygen by a process. called electrolysis. In a device known as an electrolyzer, this reaction occurs. The size of an electrolyzer can vary, from small, appliance-sized machinery that is ideal for small-scale distributed hydrogen production to big, central production facilities that could be connected directly to renewable or other non-greenhouse gas-emitting sources of energy generation.
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a plane electromagnetic wave with wavelength 500 nm travels in free space in the direction ( 3/2, 1/2, 0) with its electric field ~e, of amplitude 200 v/ m, traveling along the z direction. write the expressions for the electric and magnetic fields associated to this wave.
v = λf. Any electromagnetic wave traveling across empty space will travel at the speed of light, which is 3*108 m/s.As long as f = c, electromagnetic waves can be of any wavelength or frequency.
How is the path of an em phenomena determined?An E&M wave's direction of propagation can be determined by pointing the right hand's fingers in the direction of the field, curling them in the direction of magnetic field, then pointing the thumb in that direction.
What long does it take an electromagnetic signal to move one meter through empty space?In vacuum, all electromagnetic waves move at the same speed.About 300 million metres every sec (3.0 x 108 m/s) is what is known as the speed of light.
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2. the uniform 150-lb beam is initially at rest when the forces are applied to the cables. determine the magnitude of the acceleration of the mass center and the angular acceleration of the beam at this instant.
The acceleration of the mass center is [tex]a = 7.857 rad / s^2[/tex]
and the angular acceleration of the beam at this instant, [tex]a_{G} = 34.1 ft/ s^2[/tex]
The mass moment of inertia of the beam :
Thus Ig = 1/2 ml^2
this implies Ig = 1/2 ( 150/ 32.2 ) (12^2)
Thus the required value of Ig = 55.90 slug ft^2
Sigma f of x = m(a g)x
which is equal to Sigma f of x = 21.47 ft/s^2 --------- 1
because 200 cos 60 = 150/ 32.2 (ag)x
and Sigma f of y = m a (g)y = 26.45 ft^2 --------2
because 200 sin 60 = 55.90α + 100(6)
The acceleration of the mass centre is a = 7.857 rad / s^2
Thus the magnitude of the acceleration is
aG = [tex]\sqrt{21.47^2+ 26.45^2}[/tex]
aG = 34.1 ft/ s^2
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) a 4.0-kg object is attached to a spring of spring constant 10 n/m. the object is displaced by 5.0 cm from the equilibrium position and let go. what is the period of vibration?
x(t)=Acos(ωt) The amplitude of the periodic motion, x (t) = A cos |A|, is the maximum magnitude of the object's displacement. is the angular frequency of motion given by 2T 2 T, where T is the period of periodic motion, or the time required to complete one full cycle.
How to Calculate the Amplitude of Simple Harmonic Motion ?
Periodic motion is defined as an object that moves back and forth over the same path. A restoring force acts to bring the moving object back to its equilibrium position. A simple harmonic motion occurs when the restoring force is proportional to an object's displacement.
The following equation describes a simple harmonic motion.
x ( t ) = A cos ( t ) | A | is the periodic motion's amplitude, which is the maximum magnitude of the object's displacement. is the angular frequency of motion given by 2 / T, where T is the period of periodic motion, the time required to complete one full cycle.
Therefore, the total period of vibrations in harmonic motion :4 | A | gives the total distance traveled in one complete cycle as an object oscillates.
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what device in a laser printer provides voltages to the corona wires? group of answer choices acps dcps hvps corona assembly
HVPS is the device in a laser printer provides voltages to the corona wires.They operate by positively charging a drum with a heated wire.
which is subsequently passed over by a laser that reverses the charge where it lands. The picture or text that will be printed is represented by the portions of the drum that are now negatively charged.The toner particles adhere to the negatively charged regions of the drum when a toner roller is moved over it. Electrical stimulation known as high-voltage pulsed stimulation (HVPS) is used to maintain and extend range of motion, avoid or delay muscular spasm, and retrain muscles..In a corona discharge, the neutral fluid, generally air, is ionized to produce an area of plasma surrounding the electrode, which allows a current to flow from the electrode with a high potential into the plasma-filled region.
complete question:
What device in a laser printer provides voltages to the corona wires?
A. Corona assembly B. ACPS C. DCPS D. HVPS
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two carts mounted on an air track are moving toward one another. cart 1 has a speed of 0.9 m/s and a mass of 0.54 kg. cart 2 has a mass of 0.67 kg. (a) if the total momentum of the system is to be zero, what is the initial speed (in m/s) of cart 2? (enter a number.)
Answer:
v=0.725
Explanation:
p=mv so momentum of cart 1 is 54x0.9=
0.486 kg•m/s,,, cart 2 has a momentum of 0.67v according to the formula for momentum, so we know that
0.67v+0.486=0.0
now subtract 0.486 from each side to
get
-0.486=0.67v
divide by 0.67 on each side to get
v=0.725
Using the picture below, what must take place for the book to move in the direction of the movement arrow?
-A force must be applied to the top of the book to make sure that it is equal to the force of friction.
-The friction of the table must increase and the friction of the book decrease to allow for movement.
-The friction must be removed for any movement to take place.
-A force in the direction of the desired movement must be applied causing the forces to be unbalanced.
For the book to move in the direction of the movement arrow, a force in the direction of the desired movement must be applied causing the forces to be unbalanced.
option D is the correct answer.
What is the Newton's first law of motion?Newton's first law of motion states that an object at rest or uniform motion in a straight line will continue in that path unless it is acted upon by an external force and it will move in the direction of the applied force.
Also, from Newton's second law of motion, which states that the force applied to an object is directly proportional to the product of mass and acceleration of the object.
Mathematically, Newton's second law of motion is written as;
F (net) = ma
F - Ff = ma
where;
F is the applied force on the objectFf is the force of friction opposing the motion of the objectm is the mass of the objecta is the acceleration of the object.Thus, for the book to move, the force of friction must be overcame by the applied force and this create an unbalanced force acting on the book. Also, the book will move in the direction of the net force acting on it.
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a block of wood has specific gravity 0.80. when placed in water, what percent of the volume of the wood is above the surface?
20% of the total volume of a wood is above the surface.
Explain the term specific gravity?Specific gravity, also referred to as relative density, is a measurement of a substance's density in relation to water's density.The specific gravity may be calculated by dividing the substance's weight in grams by its volume in cc.An individual block of wood has a specific gravity of 0.80.
The ratio of the a material's density compared to that of a standard substance is its specific gravity, sometimes referred to as relative density.The term "buoyancy" refers to the upward force a fluid applies to a submerged item in a gravitational field.When an object is submerged in a fluid, the pressure applied to its bottom surface is greater than the pressure applied to its top surface because pressure in fluids increases with depth.Thus, 20% of the total volume of a wood is above the surface.
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what would make his observation time more effective? conducting a single 30-minute observation conducting multiple 60-minute observations at different times conducting a single 3-hour observation
Conducting multiple 60-minute observations over the course of several hours would give a more complete picture than making a single observation for a longer or shorter period of time.
Which method of the gathering data is most objective?Quantitative data gathering techniques frequently rely on mathematical calculations, thus the information gathered in this way is typically regarded as being more objective and trustworthy than qualitative data.
Which of the following tasks would be an illustration of data collection by observation?calculating how many pieces can be put together in an hour by a worker. A restaurant chain employs Mikayla in the planning division.
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which of the following statement(s) is/are correct? i) stars like the sun generate energy through nuclear fusion. ii) the most stable nucleus in terms of binding energy per nucleon is 56fe. iii) the core of nuclear fission reactors consists of uranium enriched in 235u surrounded by a moderator which slows down the neutrons from the 235u.
The correct option is (ii) the most stable nucleus in terms of binding energy per nucleon is 56fe.
Excluding lighter nuclei, the average binding energy per nucleon is about 8 MeV.The maximum binding energy per nucleon occurs around the mass number A = 50 and corresponds to the most stable nuclei. The Fe56 iron nucleus is located near the peak with a value of binding energy per nucleon of approximately 8.8 MeV. It is one of the most stable nuclides in existence.Nuclei with very low or very high mass numbers have less binding energy per nucleon and are less stable because the lower the binding energy per nucleon, the easier it is to split the nucleus into its individual nucleons.Nuclei with low mass numbers can undergo nuclear fusion, where light nuclei fuse together under certain conditions so that the final product can have a higher binding energy per nucleon.Nuclei with high mass numbers can undergo nuclear fission, where the nucleus splits into two daughter nuclei with the release of neutrons. The daughter nuclei will have a greater binding energy per nucleon.To study more about nuclear fusion -
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a figure skater is spinning slowly with arms outstretched. she brings her arms in close to her body and her moment of inertia decreases by 1/2. by what factor does her rotational kinetic energy change?
The moment of inertia is in half as she draws her arms closer to her torso. A double increase in angular velocity.
What is the straightforward meaning of velocity?The shift that an object / particle experiences with regards to time is expressed vectorially as velocity. The meter / second (m/s) is the accepted unit of flow speed (also known as speed).
How do you calculate velocity?The vector quantity velocity (v), denoted by equation v = s/t, quantifies displacement (not change in position, s), over change in time (t). Velocity (or rate, ) is a scalar number, denoted by the formula r = d/t, that quantifies the average distance (d) so over change in time (t).
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You make yourself and your friend a cup of hot chocolate and add vanilla ice cream. You quickly enjoy yours, but your friend takes a long time to come, so you get to observe theirs as a science experiment.
In what direction does the heat flow? (2 points)
Describe how the kinetic energy of the hot chocolate changes once you add the ice cream. (2 points)
How does the kinetic energy of the ice cream change once you put it in the hot chocolate? (2 points)
What happens to the temperature of each substance? Be specific. (2 points)
When will the temperature of the ice cream and the hot chocolate stop changing? (2 points)
1) The heat would flow from the hot chocolate to the ice cream.
2) The chocolate is going to decrease in its kinetic energy.
3) The ice cream would increase in its kinetic energy
4) The temperature of the hot chocolate would decrease while the temperature of the ice cream would increase
5) The temperature of the ice cream and the hot chocolate would stop changing when thermal equilibrium is attained.
What is the kinetic energy?Let us take our minds back to the kinetic theory of matter. We know that according to the kinetic theory matter, matter is composed of small particles that are in constant motion. We also define the temperature of the body as a measure of the average kinetic energy of the molecules of the body.
In this case, we can see that the chocolate is at a higher temperature thus its particles have a higher kinetic energy and the kinetic energy would flow from the hot chocolate to the cold ice cream. The kinetic energy of the ice cream would increase once it comes into contact with the hot chocolate.
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using the travel time curve you have printed from the course content (note: each division between the minutes is 20 seconds): if the time difference between the first arrival of p waves and the first arrival of s wave is 4 minutes 10 seconds, what is the approximate distance to the epicenter?
Using travel time , the distance of wave to epicenter is 7.5 x 10¹⁰m.
Dr. Robert Butler briefly described how to use seismic travel time curves. You can observe P- and S-wave arrivals on a seismogram and calculate how far the earthquake was from your station. A travel time curve is a plot of arrival times, usually of a P or S wave, recorded at various points as a function of distance from the seismic source. Seismic velocities in the ground can be calculated from the slopes of the resulting curves.A seismic wave traveling through an isotropic homogeneous medium will propagate at a constant speed. Thus, the time required for a seismic wave to travel from source to receiver in a homogeneous earth layer with velocity is simply given by the formula t=d/v , where is the distance traveled in the layer. In a seismic survey, we measure the travel times between the source and the receiver and use this data to estimate the properties of the subsurface. Basic seismic interpretation methods assume that the Earth is composed of a series of uniform layers and attempt to calculate the thicknesses, velocities, and sometimes dips of each layer. We will discuss specific techniques for calculating layer thicknesses and velocities in the reflection and refraction survey sections.D=vt
1 min =60 sec
4min= 60x 4=240 sec
Total time difference=240+10=250sec
D=3 x 10⁸ x 250=7.5 x 10¹⁰m
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Label the structures of the vertebra. Lumbar vertebra Transverse process 1 Vertebral foramen 5 DONE FEATURES Body of vertebra Spinous process Superior articular process Superior view Pedicle Inferior articular procOSS Vertebral arch Lateral view Lamina < Prev 42 of 50 !!! Next >
There are five lumbar vertebrae situated in the lumbar region of the spine.
Brief about five lumbar vertebrae situated in the lumbar region?
There are five lumbar vertebrae situated in the lumbar region of the spine.It has large ,kidney shaped body.The vertebral foramen is triangular in shape.It has a short spinous processes situated posterior to the body .The pedicle arises from the body of the vertebra and joins with the lamina to form vertebral arch.The lamina is the portion of bone which attaches spinous process with the vertebral arch .The superior and inferior articular processes have facets for articulation with the adjacent vertebrae.The superior and inferior articular processes are seen in lateral view of the vertebra.Therefore, There are five lumbar vertebrae situated in the lumbar region of the spine.
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a 1.2 kg book is lying on a 0.77 m -high table. you pick it up and place it on a bookshelf 2.0 m above the floor. during this process, how much work does gravity do on the book?
According to the given statement 20.49J work does gravity do on the book.
What is work in a physics?When an object changes over a range by an external force, at least a portion of that force must be applied there in plane of the displacement. This is known as work in physics. Stimulates into an object to cause some displacement is what is referred to as work. The ability to perform tasks is referred to as energy. The work is consistently the same. ’s kinetic energy are two examples of the various types of energy. Joule is the SI sequence of tasks (J). The work accomplished by a force with one newton creating a motion of one meter is known as a joule.
Briefing:W=Fd
W=mgd=mgh
W=(1.7kg)(9.8m/s^2)(2m-0.77m)
W=20.49J
The work is equal to 20.49J.
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how much work is done by the environment in the process shown in the figure?
Work done by the environment is [tex]-1J[/tex]
Initial kinetic energy, [tex]K_{i} =4J[/tex]
Initial potential energy, [tex]U_{i} =1J[/tex]
Final potential energy, [tex]U_{f} =2J[/tex]
Final kinetic energy, [tex]K_{f} =1J[/tex]
Final thermal energy, [tex]E_{th} =1J[/tex]
The work that an object can perform as a result of its mobility is measured by its kinetic energy.
The entire energy in any process is always conserved, according to the law of energy conservation. As a result, the process's final kinetic energy is computed as
[tex]K_{i} + U_{i} + W_{ext} = K_{f} + U_{f} + E_{th}[/tex]
Substituting the values from the energy bar chart given,
[tex]4+1+ W_{ext}=1+2+1[/tex]
[tex]W_{ext}= -1J[/tex]
In physics, Work is the energy transferred to or from an object thru the application of force alongside a displacement. it's miles a trendy mechanical amount. In its only form, for a regular pressure aligned with the path of motion, the paintings equal the product of the force of electricity and the gap traveled. A pressure is stated to do positive paintings if while carried out it has a thing within the path of the displacement of the factor of software. A force does bad work if it has an issue contrary to the direction of the displacement on the factor of application of the force.
As an example, whilst a ball is held above the floor and then dropped, the work performed via the gravitational pressure on the ball as it falls is wonderful and is the same as the load of the ball (a force) accelerated with the aid of the distance to the ground (a displacement). If the ball is thrown upwards, the paintings performed with the aid of its weight are negative and are identical to the burden accelerated by the displacement in the upwards route.
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Complete Question:
How much work is done by the environment in the process shown in the figure? Is energy transferred from the environment to the system or from the system to the environment?
a 5.0 kg obkect slides fown a surfaced incline at an angle of 30 degrees from the horizontal. The total distance moved by the object along the plane is 10 meters. The work done on the object by the normal force of the surface is:_____.
a. 0.25 kJ
b. zero
c. 0.50 kJ
d. 0.43 kJ
e. 0.58 kJ
B. Zero, The work done on the object by the normal force of the surface is zero. work done is measured in joules (J) and force is measured in newtons (N).
How to solve?The body is inclined at θ=30°,
s=10m, m=5kg
Work done by the object = FsCosθ
but the surface is a friction-less, this means coefficient of friction =0
F=μR
F=0*R
F=0
W=FScosθ
W=0*SCosθ
Work done =0
What is the difference between work and Work done?There is connection between work and energy, in a sense that when there is a net force doing work on an object, the object's kinetic energy will change by an amount equal to the work done.
What is Work done on the system?If force is applied on a system and the it experiences a displacement then the work is said to be done on the system. If a system applies a force on something and causes displacement then the work is said to be done by the system.
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an inductor, a capacitor, and a resistor are all connected in series across an ac source. if the resistance, inductance, and capacitance are all doubled, by what factor does each of the following quantities change? indicate whether they increase or decrease: (a) the resonance angular frequency; (b) the inductive reactance; (c) the capacitive reactance. (d) does the impedance double?
(a) Angular frequency is halved by doubling the all parameters, like resistance, inductance and capacitance.
since all parameters are doubled.
we have,
[tex]R_{2[/tex] is [tex]2R_{2[/tex]
[tex]C_{2[/tex] is [tex]2C_{2[/tex]
[tex]L_{2[/tex] is [tex]2L_{2[/tex]
Since angular frequency ω is dependent on inductance L and capacitance C
ω= 1/√LC
1/√4
= 1/2
so, angular frequency is halved.
(b) inductive reactance does not change.
Xl= ωL
= 1/2×2
=1
(c) Capacitive reactance does not change.
Xc = ωC
= 1/2×2
= 1
So, capacitive reactance does not change.
(d) Impedance is doubled.
We have, Z = [tex]\sqrt{R^{2+(Xl-Xc)^{2}[/tex]
where z= impedance
R= Resistance
Xl = inductive reactance
Xc = capacitive reactance
So, after solution Z= 2
So, Impedance is doubled.
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Which statement is true of a
simple machine?
A. Simple machines are used to create friction.
B. Simple machines have many moving parts.
C. Simple machines are very basic and make
work easier.
D. Simple machines are always electrical.
A machine is a physical system that use power to exert forces, regulate movement, and carry out an activity. Simple machines are very basic and make work easier.
What is machine ?
A machine is a physical system that use power to exert forces, regulate movement, and carry out an activity. The phrase is frequently used to describe both natural biological macromolecules, such as molecular machines, and man-made devices, such as those using engines or motors.
Any tool that simplifies work by adjusting a force is a machine. Every time a force pushes an item over a distance, work is done. Work = Force x Distance is an equation that measures the amount of work that is completed. You exert force on a machine when you operate it.
Simple machines are often used to lift big items with a pulley, to ride a bicycle, or to cut with a pair of scissors. It should be noted that a machine cannot be both a force multiplier and a speed multiplier.
Thus, option C is correct.
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a car is traveling 16 m/s when the driver sees a child standing in the road. he takes 0.8 s to react, then steps on the brakes and slows at 7.0 m/s2. how far does the car go before it stops?
When driver see the child standing on road his speed is 20 m/s
So here at that instant his reaction time is 0.8 s
He will cover a total distance given by product of speed and time
d₁ = v*t
d₁ = 16 * 0.8
d₁ = 12.8
now after this he will apply brakes with acceleration a = 7 m/s^2
so the distance covered before it stop is given by
v(f)² - v(i)² = 2ad
0 - (16)² = 2 * (-7)* d₂
d₂ = 18.2
so the total distance covered by it
d = d₁ + d₂
d = 12.8 + 18.2
d = 31 m
Therefore, the distance covered before the car stops is 31 m
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4. if a curve with a radius of 95m is perfectly banked (no friction) for a car traveling at 88km/h, (a) what is the angle of the banking? (b) what must the coefficient of static friction be for a car traveling at 115km/h around the same turn?
a) The angle of the banking, is = 32.65° b) Coefficient of static friction is = 0
What is coefficient of static friction?The ratio of the maximum static friction force between the surfaces in contact before movement commences to the normal force is called the coefficient of static friction.
Given radius of the banked curve is, r = 95 m.
Given, v= 88 km/hr
Maximum speed of the car for which road is banked is,
=(88km/1hr) *(1000m/1km) *(1hr/60min)*(1min/60sec)
= 24.44m/s
As we know, tanФ = v² /r*g
= 24.44² /(95 * 9.8)
= 0.641
Ф = tan⁻¹(0.641)
= 32.65°
μ=(v²/r- g tan Ф) / (g + v²/r tanФ)
= (24.44² /95- 9.8 * 0.641)/ (9.8+( 24.44² * 0.641 /95))
= (6.28 - 6.28) / [9.8 + 4.02)]
= 0
Coefficient of static friction is = 0
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for orbits of greater altitude, is the period longer or shorter? is the speed faster or slower?
That period is longer as well as the speed is slower, according to the supplied statement.
What is speed and how is it used?An example of an amphetamine is speed. It's a stimulant for the nervous system that releases significant amounts of dopamine. Dopamine is a neurotransmitter in the brain linked to reward and pleasure. Amphetamines come in a variety of varieties.
What is street speed?Although it is occasionally used it to apply to certain other amphetamines, speed is the main thoroughfare for amphetamine sulphate. It typically appears as an off-white to pink powder and occasionally as crystals. It can also be found in the form of a paste, which is often white, grey, or brown in color and can be grippy and wet.
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radha climbs a 80 metre high hill within 4 minutes. Calculate her power. the weight of her body is 40 kg
Answer:
Below
Explanation:
Power = work/time and work = F * distance and Force = ma
power = m * a * d / seconds
40 * 9.81 * 80 / ( 4*60) = 130.8 Watts
The calculated power is when Radha climbs a 80 meter high hill within 4 minutes and her weight is 40kg.
Power is rate of doing work, Power is work divided by time.
In this problem Radha is climbing hill which is 80 meter in height. her weight is 40kg, writing weight in Si Unit (newton), we have to multiply it by acceleration due to gravity, Hence weight in newton will be 40×9.8= 392N.
Radha have to force herself by 392N to climb hence force is 392N.
Given,
Force = 392N
height = 80m
Time = 4 minute = 4×60 = 240s
Power = Work/time = F×s÷t = 392×80÷240
Power = 31360/240 = 130.6 W
Hence power calculated is 130.6 W.
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