To increase the time the athletes are made to fall either on a cushioned bed or sand bed
In order to increase the time of the athlete's fall to stop after making the jump. This decreases the rate of change of momentum and hence the force.
In a high jump athletic event, the athletes are made to fall either on a cushioned bed or sand bed to to increase the time of the athlete's fall to stop after making the jump . If the time elapsed increases , the force will decrease . Due to decreases of the rate of change of momentum , the force will decrease .
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How is velocity different from speed?
Velocity is based on distance.
Velocity includes direction.
Velocity can be an average or instantaneous.
Answer:
Velocity is based on distance.
Explanation:
Speed-is the time which an object is moving.
Velocity-is the direction of an object's movement.
Answer:
Velocity includes direction.
Explanation:
speed is only the rate which an object moves while velocity is the rate and directions which an object moves.
Octane is a component of gasoline. It reacts with oxygen, O2 , to form carbon dioxide and water. Is octane an element or a compound? How can you tell?
Octane is a compound since it is composed of more than two elements of the periodic table.
What is octane?Octane is a linear hydrocarbon made up of hydrogen and carbon molecules, which makes it an organic molecule. Octane will be part of the composition of gasoline. The quality of the gasoline is measured by the octane number, the more octane there is, the higher the octane number and the better the quality of the gasoline.
It is a compound since it is said to be if it is made up of more than two elements from the periodic table. The elements of the compound cannot be separated by physical processes such as filtration or decantation, but only by chemical processes.
Therefore, we can confirm that octane is a compound since it is composed of more than two elements of the periodic table.
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Which of the following is not true for a load-extension graph up to the limit of proportionality?
a) It is a straight line
b) It can cross the y-axis at any point
c) Extension ÷ load always equals the same value
d) If the load is doubled, then the extension is doubled
Answer:
Explanation:
Which of the following is not true for a load-extension graph up to the limit of proportionality?
a) It is a straight line (TRUE)
(See graph)
b) It can cross the y-axis at any point (FALSE)
c) Extension ÷ load always equals the same value (TRUE)
ΔL / P = 1/k (k - stiffness)
d) If the load is doubled, then the extension is doubled
P = k·ΔL
2·P = k·(2·ΔL)
compute the position and the focal lenght of a converging lens of which will profuce the image of a lamp magnified 4 times on a screen 10cm from the lamp
here
u = distance from object and mirror
v = length of image
f = focal distance
m = magnification
A 30.0 kg object is falling in air and experiences a force due to air resistance of 50.0 N. What is the net force acting on the object?
A) -244 N
B) -110 N
C) 94 N
The net force acting on the object will be 244 in downward direction
Forces acting on a freely falling body will be
1) Force due to gravity ( in downward direction ) or gravitational force
2) Force due to air resistance ( in upward direction )
Net force = Force due to gravity - Force due to air resistance
= - mg + Force due to air resistance
= - 30 * 9.8 + 50
= - 294 + 50 = -244 N
correct answer is
A) -244 N
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A 4 kilogram object accelerates at 2.5 m/s2. What is the net force in Newtons of the object?
The net force in Newtons of the object is 10N.
Solution:
m1 = 4kg
a = 2.5m/s²
Force m = ma
F = 4 * 2.5 = 10N.
The greater the net force acting on an object the greater its acceleration. Newton's second law of motion summarizes these relationships. We can rewrite the acceleration equation above to find the net force. The net force on an object is the combined effect of all compressive and tensile forces actually acting on the object.
When the forces pushing or pulling an object are unbalanced the object accelerates in the direction of the net force. The net force is the sum of all the individual forces acting on an object. Newton's first law can be viewed as a special case of Newton's second law when the net force F is zero. The acceleration must also be zero.
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Consider a 3 kg, uniform, horizontal rod with a length of 2 m. What is the magnitude of the gravitational torque about a point located 13 cm from the left-most edge? Round to two
decimal places and express the answer in Sl units
The magnitude of the gravitational torque 6.47 Nm.
Gravitational torque is performed at the middle of the drum that is intersecting the axis of rotation (i.e. r = zero), inflicting a fee of torque 0. The route of the net torque across the center of mass is difficult to determine directly. Gravity offers no torque, and friction and ordinary forces supply opposing torques.
The center of mass of the rod
= R = 2/2
= 1
So torque τ = r × F
τ = r F
Torque at point P = τ p
= r × m g
τp = ( 1 - 0.13 ) × 2 × 9.8
=17.052 N m
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A 10 kg block should be pushed up a steep plan, with a slope of 37 °, at constant speed. What should be the size of the force needed in this case, if the friction coefficient is 0.5? b) What should be the size of the force needed to push the block with a=2 m-s¹?
a) The magnitude of force needed is 29.49 N.
b) The magnitude of force needed to push the block with a=2 m-s⁻² is 49.49 N.
What is friction?Friction is a form of relative force that works as resistance between two bodies that are in touch with one another. In other words, there is a force that opposes the relative motion of two bodies when they are in contact.
Given parameters:
Mass of the block; m = 10 kg.
Slope of the plan; θ = 37°.
Coefficient of friction, μ = 0.5.
Taking acceleration of gravity; g = 9.8 m/s².
a)Hence, magnitude of force needed = friction force = μ× normal force
= μmgsin37°
= 0.5 × 10 × 9.8 × sin 37°
= 29.49 N.
b) The magnitude of force needed to push the block with a=2 m-s⁻² is = friction force + ma
= 29.49 N +10×2 N
= 49.49 N.
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A guitar string of length 30 cm and stretched under a tension of 78 n has a certain fundamental frequency. How long would a pipe, open at both ends, need to be to play the same fundamental frequency? a 15-cm long piece of the guitar string has a mass of 0. 4 g. The speed of sound in air is 340 m/s.
0.6 m long would a pipe, open at both ends, need to be to play the same fundamental frequency .
Frequency, in physics, the number of waves passing through a fixed point in a unit of time. Also, the number of cycles or oscillations per unit time experienced by an object in periodic motion. An object in periodic motion is said to undergo a cycle or oscillation after returning to its original state through a series of events or positions. See also angular velocity. A simple harmonious movement.
The period or time interval required to complete a cycle or oscillation is 1/2 second, then the frequency is 2/second. If the period is 1/100 hour, the frequency is 100 per hour. In general, frequency is the reciprocal of duration or time interval. That is, frequency = 1/duration = 1/(time interval). The frequency of the moon's orbit around the earth is just over 12 cycles per year. His A string on the violin has a frequency of 440 vibrations or cycles per second.
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if the mass and the momentum of an object are given
The formula for linear momentum is p = mv. The relationship between momentum and an object's mass and speed is straightforward. Therefore, an object's momentum increases with increasing mass or velocity. The vector of momentum p has the same direction as the vector of velocity v.
Linear Momentum:
The product of an object's mass, m, and its velocity, v, is the vector quantity known as linear momentum. It is represented by the letter "p," which is also used to denote momentum. Please be aware that the body's momentum always points in the same direction as its vector of velocity. Because it is a conserved quantity, a system's overall momentum is always constant. kg/s is the unit of linear momentum.
Complete question:
If the mass and the momentum of an object are given, how do we find the velocity?
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A piece of clay sits 0.22 m from the center of a potter’s wheel.
If the potter spins the wheel at an angular speed of 20.5 rad/s, what is the magnitude of the centripetal acceleration of the piece of clay on the wheel?
Answer in units of m/s2.
The magnitude of the centripetal acceleration of the piece of clay on the wheel will be 4.51 [tex]m/s^{2}[/tex]
When an object is moving in a circle , it experiences an acceleration towards the center of the circle is known as Centripetal acceleration
centripetal acceleration = radius * ([tex]omega^{2}[/tex])
= 0.22 * 20.5
= 4.51 [tex]m/s^{2}[/tex]
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(please help answer with solution 50 points)
A golfer can hit a golf ball a horizontal distance of over 300 m on a good drive What maximum height will a 301.5 m drive each if it is launched at an angle of 25.0" to the ground? (Hint: At the top of its flight, the ball's vertical velocity com ponent will be zero.)
The maximum height of the ball is 35.1m.
Solution:
The angle of launch, theta = 25 degree
Let the initial velocity of launch be u
For a horizontal range , R = 301.5 m = u^2 * sin(2*theta) /g
301.5 = u^2 * sin(2*25) /9.81
u = 62.14 m/s
The maximum height , hm = (u * sin(theta))^2 /2g
hm = (62.14 * sin(25) )^2 /(2*9.81) m
hm = 35.1 m
At its highest point, the vertical velocity is zero. As the object falls toward the Earth its vertical velocity increases again, but points in the opposite direction to its initial vertical velocity. This is because gravity acts vertically downward, causing deceleration and making the vertical component of velocity zero. Projectile Motion for Vertical Velocity Calculator is an online tool for calculating the vertical velocity of particles in projectile motion.
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What trend do you observe in the Total Energy column at all the positions?
Do you notice a pattern in the Total Energy column for all the spots where the skater turns and returns in the opposite direction? Its highest value at those locations.
How does energy work in Example?Various types of energy are present. These include, for instance, energy from light, heat, mechanical motion, gravity, electricity, sound, chemicals, nuclear or atomic energy, and so forth. It is possible to alter or convert one form into another.
What kind of energy comes primarily from?The main energy sources in the environment are fossil fuels like coal, oil, natural gas, uranium, and biomass. With the exception of biomass, none of the principal fuel sources are renewable. Renewable energy sources including geothermal energy, the sun's rays, the wind's movement, and the water's flow are also considered primary sources.
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What is the magnitude of the net displacement of a point on the rim of the blade during the deceleration?.
The correct answer is net displacement of a point on the rim of the blade during the deceleration is 10.0 in or 0.254 m 10.0 i n o r 0.254 magnitude .
Magnitude in physics is simply described as "distance or quantity." It shows the size or direction that an object moves in either an absolute or relative sense. It is a way of expressing something's size or scope. Magnitude in physics often describes a length or a size. A scalar is used to indicate a force's magnitude, which is the amount to which the body it is acting on will be accelerated by the force (a single number). The force's strength can also be considered in terms of its magnitude. An attribute of a mathematical object that indicates whether it is bigger or smaller than other things of the same kind is its magnitude or size.
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analyze will pushing on a car always change the cars mechanical energy ?
Pushing on a car will not change cars mechanical energy because it does not create mechanical energy.
Mechanical energy is the energy of either an item in motion or the energy that is saved in object via their position. Mechanical strength is also a driving force of renewable strength.
There are types of mechanical energy: Potential energy and Kinetic energy. Combined, the sum of the 2 is called the overall mechanical power. Mechanical power is countless in nature.
Advantages of Mechanical energy are that this energy source does not not run out and can also be transformed into different types of power. Disadvantages of mechanical energy is that the machines that permit you to have the benefits of mechanical energy can create protection issues and also grow to be worn out and costly to fix.
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You've been waiting for the bus and your hands become cold. When you get onto the bus and sit down, you put your hands under your legs to warm up. After a while your hands feel warmer but your legs feel colder. Explain this with regards to what you know about thermal energy transfer
All metabolic process requires the transmission of energy. Because total energy is conserved, there will be no energy loss or gain in a system, and to maintain this balance, energy will be transferred from a lower energy location to a higher energy place.
What is thermal energy?Thermal energy is energy in the form of heat that may be transferred from one component to the other in the same way that any other energy type can.
When energy is conserved in a system, there is no net gain or loss of energy. As a result, energy lost in one area flows to the other sections. Any energy form can go from a low-intensity area to a high-intensity area.
When our hands chill, we may warm them up by rubbing them on our legs. Where heat energy is transmitted from our legs to our hands in order to warm them. Thus, the temperature is delivered to a cooler component from a hot part in this case.
This is an example of heat transfer, thus our legs cool down because part of their temperature is transferred to our hands, but our body's total temperature remains balanced.
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114.0 g of water is heated using 67.0 W of power, with perfect efficiency. How long will it take to raise the temperature of the water from 15° C to 25° C?
Water will take a time of 71.2 seconds to raise the temperature of the water from 15° C to 25° C.
What is the specific heat capacity?The specific heat capacity can be demonstrated as the quantity of heat needed to increase the temperature in one unit of material by one degree celcius.
Whenever the energy will be lost or absorbed the temperature of the material will be changed:
Q = mCΔT
Given, the mass of the water, m = 114 Kg
The change in the temperature = 25 - 15= 10 °C
The specific heat capacity of the water, C =4.184 J/g°C
The time can be calculated for the given change in temperatures as:
P × t = m×C ×ΔT
67 W × t = 114g × (4.184 J/g°C) × 10 °C
t = 71.19 sec
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A person kicks a ball into the air with a force Fo. The figure shows the position of the ball at various times. What is the net force on the ball
and its acceleration at the highest point shown?
Net force at highest position is force due to gravity= m*g
net acceleration of ball at highest point is = g towards ground
What is force?Force can be understood as the push or pull on an object with mass that causes it to change its velocity. Force is external and is capable of changing a body's state of rest or motion.
When a person kicks the ball with initial force Fo, then energy associated with this force is transferred to the ball in the form of momentum change and hence velocity of ball is non zero.
In this case impulse imparted by the force is equal to change in momentum of the ball.
The only force acting on the ball at his highest is is the force due to gravity.
Net force on ball = m *g
a = F/m
= m*g/m=g
Net force at highest position is force due to gravity= m*g
net acceleration of ball at highest point is = g towards ground
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A museum curator moves artifacts into place on many different display surfaces consider the following table giving approximate values for coefficient of friction.
What is Fs,mar for moving a 154 kg aluminum sculpture across a horizontal steel
platform? The acceleration of gravity is
9.81 m/s².
Answer in units of N.
Static friction is 0 N ≤ [tex]f_{max}[/tex] ≤ 920.612N
Maximum static friction is 920.612N
Kinetic friction is 709.324N
How do kinetic and static friction differ?Kinetic and Static Friction The friction that exists between two systems when they are in touch and immobile with respect to one another is known as static friction. Kinetic friction is the friction that occurs when two systems are in contact and moving in relation to one another.
Aluminum and steel have a static friction coefficient of [tex]\mu_{k}[/tex] =0.47 and a kinetic friction coefficient of [tex]\mu_{s}[/tex] = 0.61 respectively.
Given.
Mass = 154 kg
The weight of the sculpture made of aluminum will exert a normal force equal to that of the steel platform. This is,
N = mg
The static friction is now calculated by multiplying the normal force by the coefficient of static friction. From 0 to limiting friction, the static friction ranges.
The maximum static friction that a body can experience in order to prevent motion is known as the limiting friction.
The limiting friction value, often known as the maximum static friction, is given as:
[tex]f_{max} = \mu_{s} N =\mu_{s} mg[/tex] = 0.61 ×154×9.8 = 920.612N.
Static friction is defined as follows:
0 N ≤ [tex]f_{max}[/tex] ≤ 920.612N.
The frictional force that affects a body as it is moving while being acted upon by forces is known as kinetic friction. As a result, the product of normal force and the coefficient of kinetic friction is kinetic friction. Kinetic friction is a persistent force that opposes.
So, the formula for kinetic friction is:
[tex]f_{k}[/tex] = [tex]\mu_{k}[/tex]N
[tex]f_{k}[/tex] = [tex]\mu_{k}[/tex]mg
[tex]f_{k}[/tex] = 0.47×154×9.8
[tex]f_{k}[/tex] = 709.324N.
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The 7.4 N weight is in equilibrium under
the influence of the three forces acting on it.
The F force acts from above on the left at
an angle of a with the horizontal. The 5.9 N
force acts from above on the right at an angle
of 44° with the horizontal. The force 7.4 N
acts straight down.
Ĵ
44°
5.9 N
7.4 N
What is the magnitude of the force F?
Answer in units of N.
part 2 of 2
What is the angle a of the force F as shown
in the figure?
a) Magnitude of force is 5.37N
b) Angle of force is - 37.88°
What is force?In physics, we define a force is an influence that can change the motion of object. A force can cause an object with mass to change to accelerate.
Given force from above is 5.9N
∑Fₓ = F₁ₓ + F₂ₓ+F₃ₓ = 0
F₂ cos 44° + Fₓ = 0
Fₓ = - 5.9 cos44°
= - 4.24 N
Given force that acts downward as 7.4N
∑Fy= Fy1+ Fy2 +Fy3 =0
Fy+ 5.9 sin 44° - 7.4= 0
F = 3.30 N
F =√Fₓ² +Fy²
= 5.37 N
b) angle of force= tan⁻¹ (3.30/-4.24)
= - 37.88°
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The ratio of blue paint to yellow paint is 5:6 in order of blue paint are used how many ounces of yellow painy are needed to creat green?
There are 36 ounces of yellow paint.
Both blue and yellow paint reflect intermediate wavelengths. Therefore, if you mix blue and yellow paint the mixture will appear green. I have found that blues and greens produce predominantly cyan or turquoise tones but mixing colors is never the right thing to do with darker or lighter grays.
Mixing blue and green makes him a tertiary color on the color wheel, teal. Blue-green is similar to turquoise or the color of the sea. This is one of the most common and popular tertiary colors. For a light aqua color mix cobalt blue with white. The primary colors are red blue and yellow. Primary colors cannot be mixed with other colors. They are the source of all other colors.
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Choose whether the given unit is a unit of power or a unit of energy.
unit of power: joule/sec (J/s)
unit of energy: watt x year (Wyr) (costs about $1)
unit of energy: calorie (cal)
unit of energy: kilojoule (kJ)
unit of power: kilowatt (kW)
unit of power: watt (W)
unit of energy: kilowatt x hour (kWh) (costs about $0.10)
unit of power: megawatt (MW)
unit of energy: kilocalorie (kcal)
unit of power: kilowatt x hr / year (kWh / yr)
unit of energy: joule (J)
unit of power: gigawatt (GW)
Different units of power given in the question is: joule/sec (J/s), kilowatt (kW), watt (W), megawatt (MW), kilowatt x hr / year (kWh / yr), gigawatt (GW).
Different units of energy given in the question is: calorie (cal), kilojoule (kJ), kilowatt x hour (kWh), kilocalorie (kcal), joule (J).
What is energy?Energy has the capacity to bring about change, such as motion. To execute tasks (like lifting a box), energy is needed. A battery can store a certain amount of energy, just as a certain quantity of fuel, such as food, can.
The joule is the base unit of energy. This indicates that no matter how quickly a box is picked up, a job like lifting it requires a specific number of joules.
What is power?Power is the ratio of the amount of energy utilized to the time it took to use it. It measures how quickly energy is used or transported. Its watt measurement equals one joule of energy used every second.
Hence, units of energy is equal to products of unit of time and unit of power and they can easily interchange.
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A golf ball leaves the club with a horizontal velocity of 10 m/s and a
vertical velocity of 15 m/s. Calculate the resultant velocity of the golf ball.
The resultant velocity of the golf ball is 18.03 m/s
What is Resultant velocity?
An object's total vector velocity is the sum of its component vector velocities. The scalar product of an object's mass and acceleration vector equals the sum of the vector forces acting on it. If indeed the two objects stick together again after impact, divide the total momentum even by sum of the masses. You will then be given the two objects' resultant velocity as a result. In the aforementioned example, 50 would be divided by the total mass of the masses, which really is 10, yielding a speed of 5 metres per second.
Horizontal velocity= 10 m/s
Vertical velocity= 15 m/s
Resultant velocity= [tex]\sqrt{100+225}[/tex] = [tex]\sqrt{325}[/tex] = 18.03 m/s
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According to the psychoanalytic perspective a personality personality is based on
The psychoanalytic perspective states that a personality is based on the childhood experiences as well as unconscious mind.
What do you mean by psychoanalytic perspective?
In English, the terms psychoanalytic and psychoanalytical are employed. The latter phrase, which is older, originally just meant "related to the investigation of the human psyche." However, both titles evolved to refer to that as psychoanalysis became recognized as a separate therapeutic discipline. Even while both are still in use, psychoanalysis is the more common descriptor nowadays. Humans are defined as having sexual and violent urges from the perspective of a psychoanalytic lens.
Psychoanalytic theory of personality: a psychoanalytic approach that focuses on each person's unconscious thoughts, beliefs, and memories. It says that these traits affect our personalities and behaviors.
The three level of consciousness are:
Consciousness
According to Freud, every human has a conscious mind that stores all of the information they are aware of about their surroundings. Any ideas, emotions, or even easily recalled memories are all included in the conscious mind. It's all we already know and are conscious of.
Preconsciousness
The level immediately beneath aware is known as preconscious. Everything that is not in the conscious mind but may very simply be recalled and become conscious is included in the preconscious mind.
Unconsciousness
The unconscious mind is the third and last degree of consciousness. Anything that is suppressed, seems to have been forgotten, or any emotion or thought that is not conscious is what is known as the unconscious mind. This could include mistreatment or bullying of children toward their parents.
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A proton and an electron are moving with the same velocity v perpendicular to a uniform
magnetic field B. Answer the following (explaining the answer):
a) What kind of trajectory each particle follows? (Draw it)
b) Is the value of an electric field E the same for both particles if we want it to make the particles move following a straight-line trajectory? Why?
c) What’s the kinetic energy change before and after applying the electric field?
Data: Proton mass is, approximately, 1836 times electron’s mass.
When E depends on the strength of the magnetic field and velocity, the strength of the electric field must also be the same to maintain a straight-line motion without deviating from it.
What is kinetic energy?The energy that an object has because it is moving is determined by the initial energy in physics. It is defined as the amount of effort required to accelerate an object of known weight from resting to its specified velocity. The body keeps its kinetic energy after gaining it during acceleration, barring speed changes. When slowing from its current pace to a point of rest, the body expends the same amount of energy.
(a)
The magnetic field is on the page and the image is attached.
(b)
The magnetic force must be balanced with force due to the electric Field.
Eq = qvB sinθ
Eq = qvB sin 90
E =vB
(c)
The kinetic energy of the particle with velocity v and mass m,
KE = 1/2 mv²
The proton's kinetic energy is 1836 times more than that of the electron since it is more heavy than it is.
The shift in kinetic energy will then be equal to zero if there is no increase in velocity between before and after the electric field is applied.
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Below are sample standard word problems involving application of Newton's laws of motion.
1. A box with mass 10.5 kg moves on a ramp that is inclined at an angle of 50.0∘ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is μk = 0.310. Calculate the magnitude of the acceleration of the box if you push on the box with a constant force F = 125.0 N that is parallel to the ramp surface and directed up the ramp, moving the box up the ramp.
2. A 60.0-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.760 and 0.410, respectively. What horizontal pushing force is required to just start the crate moving and slide the crate across the dock at a constant speed? Note: Two FBDs will be provided here. The first FBD is for the crate that is about to move and the second FBD is for the crate that is already in motion at a constant speed.
Disregard the calculation part, your task is to (a) identify the forces acted on the object (in bold) and (b) draw its FBD. For Part A, you will be graded based on the correctly identified force. For each wrongly identified force, it will be deducted from your correct ones. For Part B, you will be graded based on the accuracy and completeness of your FBD with 5 points as the maximum score and 0 point as the lowest score.
The magnitude of the acceleration of the box if you push on the box with a constant force F = 125.0 N that is parallel to the ramp surface and directed up the ramp is 9.96 m / s²
N = m g cos θ
N = 10.5 * 9.8 * cos 50°
N = 65.86 N
∑ [tex]F_{x}[/tex] = m a
F - f = m a
F - μ N = m a
125 - ( 0.31 * 65.86 ) = 10.5 * a
125 - 20.42 = 10.5 a
a = 104.58 / 10.5
a = 9.96 m / s²
To just start the crate to move,
Fs = μs m g
Fs = 0.76 * 60 * 9.8
Fs = 446.88 N
To slide the crate across the dock at a constant speed,
F = μk m g
F = 0.41 * 60 * 9.8
F = 241.1 N
Therefore,
1 ) a = 9.96 m / s²
2 ) Fs = 446.88 N ; F = 241.1 N
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What force has to be overcome in order for your balloon car to start to move? Once it is moving and all the air is expelled why does your car keep moving? What causes it to stop?
It has to overcome friction and air resistance in order for your balloon car to start to move
What is a balloon car?
For balloon-powered car, the contracting balloon pushes the air in the balloon backwards. That means the air in the balloon is pushing balloon forwards. The balloon is joined to car, so the car rolls. The motion is nothing to do with pushing on the air behind car.
There are two main forces acting on balloon rocket car: Friction and Air resistance. The friction force is resistance between two objects sliding against each other. While building your car identify places where objects will be rubbing against each other creating friction. In order to get car to move, we need an unbalanced force. In other words, the force of air coming out of balloon must overcome the forces acting on the car. We will want to reduce friction and air resistance to help your car move.In the case of balloon car, the action is the air rushing out of the balloon, pushing against air behind the car. The opposite or equal reaction is that the air behind car pushing against the car with the same force, causing the car to propel forwards.The weight of car is too great and nothing moves: As the car weight increases, friction between axle and straw, wheel and axle, and wheel and floor increase. There comes a point where the forces from friction are greater than the force from air blowing out the balloon.Learn more about balloon car at https://brainly.com/question/13293570
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which has the greater acceleration: a car that increases its speed from 50 km/h to 60 km/h, or a bike that goes from 0 km/h to 10 km/h in the same time? Explain.
Answer:
They have the same acceleration.
Explanation:
50km/h to 60km/h = 10km/h
0km/h to 10 km/h = 10km/h
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Answer:
they have a same acceleration
Explanation:
50km/h to 60 km/h=10km/h
0km/h to 60 km/h=10km/h
A round stone rolls towards the edge of 21 meter cliff. As it reaches the edge of the cliff,
it is moving forward with a speed of 6.7 m/s. How far, horizontally, from the cliff face
will the rock land?
Answer:
13.9 m
Explanation:
Find time to fall vertically from 21 m to ground then multiply this TIME by the horizontal rate of 6.7 m/s
d = 1/2 a t^2
21 = 1/2 (9.81) t^2 shows t = 2.069 s
2.069 s * 6.7 m/s = 13.9 m
If the same amount of energy was applied to an equal mass of water at
20 °C, what would its final temperature be? The specific heat capacity of
water is 4200 J/kg °C.
If the same amount of energy was applied to an equal mass of water at 20 °C, its final temperature is 100 °C
q = m C ΔT
ΔT = T - To
q = Heat quantity
m = Mass
C = Specific heat capacity
ΔT = Change in temperature
T = Final temperature
To = Initial temperature
q = 1680 KJ
m = 5 kg
C = 4200 J / kg °C
To = 20 °C
q = m C ( T - To )
1680000 = 5 * 4200 ( T - 20 )
T - 20 = 80
T = 100 °C
Therefore, the final temperature would be 100 °C
The given question is incomplete. The complete question is:
1680 KJ is applied to 5 kg of water. If the same amount of energy was applied to an equal mass of water at 20 °C, what would its final temperature be? The specific heat capacity of water is 4200 J/kg °C.
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