The calculated efficiency of heat engine during each cycle is 25%.
What is heat engine and its efficiency?A heat engine is a machine that transforms heat energy into usable mechanical work for people. The process is carried out using a straightforward apparatus. The ratio of the work a heat engine performs to the heat it absorbs throughout each cycle is referred to as the heat engine's efficiency. It can also be referred to as the heat engine's thermal efficiency. If there is the greatest difference between the hot and cold reservoirs, a heat engine can operate at its maximum efficiency. There is no unit for efficiency.
A formula and a symbol can be used to indicate the efficiency of the heat engine, which is a fraction of the heat and useful work produced. The formula for heat engine efficiency is,
η= [tex]\frac{W}{Q1}[/tex]
where,
η= Thermal efficiency, W= Acquired useful work, Q1= Given heat energy
The energy given to the heat engine= 400 Joule
And the energy exhausted by the heat engine= 300 Joule
So, during each cycle of operation, the engine's efficiency can be calculated by:
η= [tex]\frac{Q1-Q2}{Q1}[/tex]
η= [tex]\frac{400-300}{400}[/tex]
η= [tex]\frac{1}{4}[/tex]
Therefore, this heat engine is found to be 25% efficient.
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you hold the can stationary for half a minute, waiting for a friend on a ladder to take it. how much work do you do during this time?
While you hold the can stationary for half a minute, waiting for a friend on a ladder to take it, you do not do any work during this time.
What is work not done in physics?
No work, as used above, is accomplished until the object is moved in some fashion and a component of the force travels along the path the object is moved along. No energy is transferred to a heavy object while it is held still since there is no displacement.What does "doing work" entail in physics?
The work is the quantity of energy that is moved from one thing or form to another. The act of transmitting such energy is called working. Applying a force over a distance is necessary for performing tasks. Energy is either transferred into or out of an object depending on the sign of the work that has been done on it.To learn more about work done, follow the link https://brainly.com/question/14900441
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the distance between the objective and eyepiece of a telescope is 50 cm. the focal length of the eyepiece is 5 cm. what is the angular magnification of this telescope?
The telescope in question has an angular magnification of -2, and its objective and eyepiece are 50 cm apart. The focal length of the eyepiece is 5 cm.
What do you mean by angular magnification?When measured from a specific point in the instrument, as is the case with magnifiers and binoculars, the ratio of the tangents of the angles subtended by an object and its image is known as angular magnification.
Given,
f₀ = 50 cm
f[tex]_{e}[/tex] = 5 cm
u₀ = -2 m = -200 cm
The telescope is used for distinct vision.
∴ d=25 cm
By Using the lens equation,
[tex]\frac{1}{v_{0}} = \frac{1}{f_{0}} +\frac{1}{u_{0}}[/tex]
[tex]\frac{1}{v_{0}} = \frac{1}{50} +\frac{1}{200}[/tex]
[tex]\frac{1}{v_{0}} = \frac{3}{200}[/tex]
∴ v₀ = 200/3 cm
By using the lens equation for the eye piece,
[tex]v_{e}[/tex] = d = -25 cm
[tex]\frac{1}{u_{e}} = \frac{1}{v_{e}} -\frac{1}{f_{e}}[/tex]
[tex]\frac{1}{u_{e}}[/tex]= [tex]-\frac{1}{5} - \frac{1}{25}[/tex]
[tex]\frac{1}{u_{e}} = - \frac{6}{25}[/tex]
∴ [tex]u_{e}[/tex] = -25/6 cm
Lets check, Magnification is M=M₀×M[tex]_{e}[/tex]
∵ M = [tex]\frac{v_{0} }{u_{0}}[/tex] × [tex]\frac{v_{e} }{u_{e} }[/tex]
M = [tex]\frac{200/3}{-200}[/tex] × [tex]\frac{-25}{-25/6}[/tex]
M = −2
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an 0.45-kg object is being pulled with a tension force of 14.2 n at a constant velocity of 3.41 m/s. what is the force of friction acting on the object?
The forces of friction acting on the object are 12.67 N.
Friction is the force resisting the relative motion of sturdy surfaces, fluid layers, and material factors sliding towards each specific. There are numerous styles of friction. Dry friction is a strain that opposes the relative lateral movement of two stable surfaces in touch.
Calculation:-
ma - 14.2 N = Friction force
14.2 N - 0.45 × 3.41 = 12.67 N
Friction is the shape of contact pressure. It exists between the surfaces that are in touch. The frictional force relies upon the character of the floor in contact. The rougher the ground, the extra friction is involved. The frictional force is proportional to the urgent pressure, which is the burden of the body. it's miles impartial of the place of the touch.
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after traveling 1 mm , is the kinetic energy of the plastic cart greater than, less than, or equal to the kinetic energy of the lead cart? explain.
Using the concepts of work, we got that kinetic energy of plastic cart is same as kinetic energy of the lead cart after travelling 1mm.
We know very well that
work done on the object=Force × displacement=change in kinetic energy
When both of plastic cart and lead cart moves 1mm displacement, in that case force exerted by the ground to stop the body is same.
Therefore, work done on the object is same for both and change in kinetic energy is same for both of the carts.
Hence, after traveling 1 mm , the kinetic energy of the plastic cart is same as the kinetic energy of the lead cart.
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in what tasks or jobs could refraction be dangerous. Please help its very urgent!!
The tasks that refraction can be dangerous is when a person is always on a swimming pool that does looks shallower than it was due to the light that is being emitted from the bottom of the pool and thus bends at the surface as a result of refraction of light and also when a person is Working in the light-production crew.
Does refractive error pose a threat?Two papers from very different parts of the world, Australia and India, published in the late 1990s, emphasized the fact that uncorrected refractive error was a significant contributor to blindness and the primary cause of vision impairment.
Therefore, When the retina is not properly illuminated by the eye, refractive error occurs. It might result in vision blur. If your child exhibits any symptoms of eye issues, you should take them to an eye doctor for a thorough eye examination.
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A 24-v battery is powering a light bulb with a resistance of 2. 5 ohms. What is the current flowing through the bulb?.
The current flowing through the light bulb is 9.6 Amperes.
According to the Ohm's Law, the potential difference or voltage across a conductor is directly proportional to the current to the current flowing in the conductor, so,
V ∝ I
V is voltage, I is current,
V = IR
Here, the voltage of the battery is 24V.
The resistance of the light bulb is 2.5 Ohms,
Now, putting values,
24 = 2.5I
I = 9.6 A.
So, the current flowing through the light bulb is 9.6A.
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what magnitude of (constant) force applied horizontally at the axle of the wheel is necessary to raise the wheel over a step obstacle of height h
The engine's torque is transferred to the wheel's periphery and acts as a force pushing the road back (via friction between the tire and the road surface).
The car is propelled forward by the ground's reaction force (Newton's third law). There is a vertical downward force produced by the weight of the car.Force can be applied to either the wheel or the axle of a wheel and axle. The input force is what is referred to as. The direction of the applied force cannot be altered by a wheel and axle.To gain mechanical advantage, a tangential force applied to the big disk's periphery can apply a stronger force on a load coupled to the axle.
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What is the speed of a plane that traveled 3000 miles from New York to California in 5 hours?
Answer:
answer is 1200
Explanation:
using speed derivation
Answer:
Explanation:
V = 3 000 / 5 = 600 miles / hour
two barges full of salted toad guts have a collision. the red barge has a mass of 150000kg and is traveling northwest at 0.25m/s. the blue barge has a mass of 1000000kg and is traveling southeast at 0.1 m/s. after the collision the blue barge has a velocity of 0.32m/s to the northwest. what is the final velocity of the red barge? in the collision elastic?
The final velocity of the red barge in the collision elastic is 0.311 m/s when it collides with blue barge pf mass 1000000 kg.
Final velocity(v3) of the red barge is calculated by following formula
m1×v1+ m2×v2= (m1+m2)v3
Substituting the value of m1= 150000 kg, v1= 0.25 m/s, m2= 1000000 kg, v2= 0.32 m/s
150000 × 0.25+ 1000000×0.32= (150000+1000000)×v3
37500+ 320000= 1150000×v3
357500= 1150000×v3
v3= 0.311 m/s
What is elastic collision velocity? The velocity of the target particle after a head-on elastic impact in which the projectile is significantly more massive than the target will be roughly double that of the projectile, but the projectile velocity will remain virtually unaltered.For more information on elastic collision velocity kindly visit to
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About how much greater is the gravitational force exerted by the moon on the near side of the earth than on the far side?.
The moon exert 7% more gravitational fore on the near side of the earth than the far side of the earth.
Define gravitational force?
The gravitational attraction attracts any two things in the cosmos, whether they have equal masses or not. Furthermore, Newton's Universal Law of Gravitation asserts that everything, including you, pulls every other item in the universe. Newtons, abbreviated N, are the unit of gravitational force.
Gravity (from Latin gravitas 'weight') is a basic interaction in physics that produces mutual attraction between all entities having mass or energy. Gravity is by far the weakest of the four basic interactions, roughly 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force, and 1029 times weaker than the weak interaction.
The distance between the moon and earth was =3.84 x 10^8m
earth radius was =6.37 x 10^6m
gravitational force near side = Fn=GMmxM/(D-r)^2------>1
gravitational force far side= Ff=GMmxM/(D+r)^2---------->2
(Fn-Ff/Fn) x 100
=1-({(D-r)^2}/(D+r) ) x 100
=1- (098/1.02)^2 x 100
= 7%
The moon has 7% more gravitational force at near side than far side.
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As a fish swims deeper into the ocean, the pressure on its body is
a. decreases
b.increases
As a fish swims deeper into the ocean, the pressure on its body is:
b.increases
The pressure on the upper surface of the water is the lowest where there is not so much water as of little water pressure, along with a little atmospheric pressure, but if you go deep inside the water the pressure will increases. As on the lower surface of water, the pressure is highest due to heavy water pressure from upwards along with atmospheric pressure. So if a fish swims deeper into an ocean the water will exert more pressure than it is on the upper, to the body of the fish, so the pressure increases.
If a boat moves toward north at 10.0 km/hr relative to the river, while the speed of the river current is 5.0 km/hr to the south, what is the actual speed of the boat from an observer on the river bank?
Answer:
Absolute Speed Va = 5.0 km/h (North)
Explanation:
Velocity addition rule:
"In classical mechanics, the absolute velocity of a point is equal to the vector sum of its relative and translational velocities".
[tex]\Vec{V_a}= \Vec{V_r}+\Vec{Ve}\\[/tex]
Given:
Vr = 10.0 km/h - relative speed (North)
Ve = 5.0 km/h - carrying speed (South)
___________________
Va - ? - Absolute Speed
Va = Vr (North) - Ve (South);
Va = 10.0 - 5.0 = 5.0 km/h (North)
What do you think it would be like to live in a binary star system? If Earth was to orbit around two stars, what might be different on Earth?
Binary stars certainly have habitable zones where liquid water may exist on the planet's surface but it may be difficult for life to gain a foothold. Colder than 16 degrees Fahrenheit minus 100 degrees on Earth.
Orbital binaries are planets orbiting two stars instead of one star. Two stars orbit each other in a binary star system, but planets usually orbit farther from the center of the system than either star but can be in stable orbits around one of the stars in the binary system. A planet is known.
No planet in a binary system is likely to have the stable orbits necessary for the evolution of life. Earth is probably very rare in that it has a stable orbit at just the right distance from a benign star and maintains that orbit for the required 4.5 billion years. We say that planets orbit stars, but that's not entirely true. Planets and stars actually orbit around a common center of gravity. This common center of gravity is called the centroid.
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A 20.0 kg object is at rest, and then speeds up to 16.0 m/s. how much work was done on this system? 320 j 2,560 j 2,880 j 5,120 j
Answer:
Explanation:
Given:
M = 20.0 kg
V₀ = 0 m/s
V = 16.0 m/s
___________
A - ?
A = M·V² / 2
A = 20.0·(16.0)² / 2 = 2 560 J
Answer: B 2560j
Explanation:
i got it right on edge 2022
What are the 4 forms of globalization?.
The four sorts of globalization are economic globalization, Social globalization, Political globalization, and Cultural globalization.
Globalization is a time period used to explain how exchange and technology have made the arena right into an extra connected and interdependent location. Globalization also captures in its scope the economic and social changes which have come approximately as an end result.
Globalization is the phrase used to explain the developing interdependence of the sector's economies, cultures, and populations, brought about by using move-border exchange in items and services, era, and flows of funding, humans, and records. free exchange agreements, such as the North American loose exchange agreement and the Trans-Pacific Partnership are examples of financial globalization. Multinational businesses, which function in two or extra international locations, play a massive role in economic globalization. Political globalization.
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What can we do to prevent collisions?.
Collisions are the act when two bodies come in direct physical contact with each other and there is some destruction caused.
Collisions are seen almost everywhere be it in space or on Earth.
Sometimes the collision happens to be destructive and sometimes the momentum is increased.
But when a vehicle collides with each other and a galaxy collides with other galaxy, this tends to bring disasters.
Collision depends on the mass of the body and the velocity at which the body is moving.
Since the mass can't be changed, what we can alter is the velocity.
Therefore, if we decrease the velocity and reduce acceleration then the collisions can be prevented.
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the voltage across a capacitor is given by find expressions for the current, power, and stored energy. sketch the waveforms to scale versus time.
The loss of voltage brought on by the passage of current through a resistance is known as voltage drop.
What is Voltage Drop?The cable's resistance and reactance grow proportionately with its length. This means that VD is a problem that is especially prevalent where there are long cable runs, such as in large buildings or on expansive properties like farms. In any single phase, line to line electrical circuit, this technique is frequently used to size conductors properly. Use a voltage drop calculator to determine this.Current flowing through electrical cables is always impeded or met with resistance. VD is defined as the voltage loss (in volts) caused by cable "impedance" that occurs throughout all or a portion of a circuit.Insufficient VD can result in lights that flicker or burn dimly, heaters that heat inefficiently, and motors that run hotter than necessary and eventually burn out. In this situation, less voltage is pushing the current, which makes the load work harder.To Learn more About voltage drop refer to:
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pleeeeeease help 50pts
Hearing loss is often due to...
loss of hair cells.
deterioration of the ear canal.
puncturing of the eardrum.
connective muscles wearing thin.
What is the speed of the glider as it enters the first gate? (Recall the linearized kinematic equationy/t = 1/ 2 gt + Vo.) Describe how to reach this value, then calculate the initial velocity for each of the six trials. Calculate the average. You do not need to show the calculation but must present all six values in a table with the average.
We may use kinematic equations to explain and forecast the motion moving objects. However, we do not yet have a precise equation that links acceleration.
What is a speed series of questions?Speed is defined as the ratio of the completed distance to the time required to cover that distance. Since speed only includes a part and no magnitude, it is a proportionality constant.
How do you respond to a question regarding Speed?By subtracting the distance traversed by the time needed to get there, speed is computed. To calculate the passing time, multiply the ranges by the speed. To calculate the distance, multiply the speed by both the time. These equations may be abbreviated as s=d/t.
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Joey is riding in an elevator which is accelerating upwards at 2.0 m/s2. The elevator weighs 300.0 kg, and Joey weighs 60.0 kg. What is the tension in the cable that pulls the elevator upwards?
A) 4200 N
B) 9800 N
C) 3700 N
D) 5200 N
4200 N is the tension in the cable that pulls the elevator upwards.
The correct option is A.
What does tension ?Tension is the force that is sent through a rope, thread, or wire whenever two opposing forces pull on it. Along the whole length of the wire, the tensile stress pulls equally on all objects at the ends. Every physical object that comes into contact with that other one exerts force on it.
Briefing:We employ the following formula to determine the cable's tension.
Formula:
T = mg+ma............ Equation 1
Where:
T is the cable's tension.
M = Mass of the elevator and the Joey
Accelerating with a
g = Gravitational acceleration
Considering the query,
Given:
m = (300+60) = 360 kg
a = 2 m/s²
g = 9.8 m/s²
Substitute these values into equation 2
T = (360×9.8)+(360×2)
T = 3528+720
T = 4248 N
T ≈ 4200 to the nearest hundred.
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it takes 2.81 msms for the current in an lrlr circuit to increase from zero to 0.75 its maximum value. part a determine the time constant of the circuit. express your answer to two significant figures and include the appropriate units.
The time constant of the circuit is 2.10 s.
How do you find time constant in a circuit?The product of the circuit resistance (in ohms) and the circuit capacitance yields the RC time constant, often known as tau, the time constant (in seconds) of an RC circuit (in farads)The equation T = R*C in seconds is used to get the time constant,.An RLC circuit's transient response and time constant can be extracted from simulations in one of two ways: Simply fit the circuit's time-domain response (natural log scale) using a transient simulation, as was mentioned before, and determine the transfer function from the slope.The formula for an RL circuit's time constant is =L/R.The time constant specifies the amount of time it takes for a signal to be reduced to 1/e, or roughly 37%, of the output signal.Given data :
product of the circuit resistance = 2.81 msms
circuit capacitance = 0.75
By applying the equation T = R*C in seconds is used to get the time constant.
T = R x C =
= 2.81 x 0.75 = 2.10 s
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Push downward on a trunk at an angle 25 deg. below the horizontal with a force of 750 N. If the trunk is on a flat surface and the coefficient of static friction between the surface and the trunk is 0.61, what is the most massive trunk you will be able to move?
The most massive trunk you will be able to move with a force of 750 N at an angle 25 deg. below the horizontal is 81.86 kg
W = m g
f = μ N
W = Weight
m = Mass
g = Acceleration due to gravity
f = Frictional force
μ = Co-efficient of friction
N = Normal force
F = 750 N
θ = 25°
μ = 0.61
∑ Fy = 0
N - F sin θ - W = 0
N = F sin θ + W
∑ Fx = 0
F cos θ - f = 0
F cos θ - μ N = 0
F cos θ - μ ( F sin θ + W ) = 0
F cos θ - μ F sin θ - μ W = 0
F cos θ - μ F sin θ - μ m g = 0
750 cos 25° - 0.61 * 750 sin 25° - 0.61 * m * 9.8 = 0
682.5 - 192.15 - 5.99 m = 0
m = 490.35 / 5.99
m = 81.86 kg
Therefore, the most massive trunk you will be able to move is 81.86 kg
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Calculate the temperature increase ΔT in a 1.40 kg sample of water that results from the conversion of 19% of the gravitational potential energy directly to heat energy in the world's tallest waterfall, the 807-m ‑tall Salto Angel in Canaima National Park, Venezuela.
The increase in temperature of the 1.4 kg sample of water that results form the conersion of 19% of the gravitational potential energy directly to heat is 0.36°C.
Increase in temperature (ΔT)?Increase in temperature is the positive difference between the final and the intial temperatures of a body.
To calculate the increase in temperature (ΔT), We use the formula below.
Formula:
ΔT = 0.19gh/c............. Equation 1Where:
ΔT = Increase in temperatureg = Acceleration due to gravityh = Height c = Specific heat capacity of waterFrom the question,
Given:
h = 807 mg = 9.8 m/s²c = 4184 J/kgKSubstitute these values into equation 1
ΔT = (0.19×807×9.8)/4184 ΔT = 0.36°CHence, the increase in temperature of the the water is 0.36°C.
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How can this set up be changed to increase the mechanical advantage?
A. Shorten the distance between the spring scale and the fulcrum.
B. Move the fulcrum closer to the clay block.
C. Place a second clay block next to the first clay block.
D.Place a second clay block next to the first clay block.
The mechanical advantage Moves the fulcrum closer to the clay block. Option B.
You can increase the mechanical advantage of the lever by increasing the power arm or decreasing the load arm. The mechanical advantage of the lever can be increased by increasing the power arm or decreasing the load arm. To increase the mechanical advantage, we need to increase the force arm and decrease the load arm.
Decreasing incline increases mechanical advantage. However, the load has to travel long distances. The ideal mechanical advantage of an incline is the length of the incline divided by the vertical incline which is called the run-to-elevation ratio. Moving the fulcrum closer to the load increases the mechanical advantage. -Moving power away from the pivot increases mechanical advantage.
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Answer: It's B, Move the fulcrum closer to the clay block.
Explanation: I took the test.
a baseball bat hits the ball with variable force. the ball weighs 0.145 kg and comes toward and (after hit) away from the batter both with 40 m/s, in opposite directions. find the maximum force fmax from the bat.
The maximum force from the bat which hits the ball with a speed of 40 m/s is 5.8 N
The mass of the ball is 0.145 g
The speed of the ball after being hit is 40 m/s
As we need to find the maximum force, let the time taken to hit the ball be 1 s
The force from the bat can be found using the formula,
F = ma
where F is the force from the bat
m is the mass of the ball
a is the acceleration of the ball
But we know that
a = s/t
where s is the speed of the ball being hit
t is the time taken
Let us substitute this in the above equation, we get
F = ms/t
F = 0.145 x 40 / 1
= 5.8
Therefore, the force from the bat is 5.8 N
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an ice skater spins at 3.5 rev/s with his arms are extended. he draws his arms in and spins at 8.3 rev/s. by what factor does his moment of inertia change in the process?
The moment of inertia changes by a factor of 0.42. Moment of inertia is defined as the quantity represented by a body that resists angular acceleration.
Moment of inertia, a quantitative measure of the rotational inertia of a body in physics - i. H. The resistance that a body exhibits to changing its rotational speed about its axis by the application of a torque (torque). Axes can be internal or external and can be fixed or unfixed. The law of conservation of inertia is given by the following equation.
Iω = I'ω'
where I is the initial inertia, ω is the initial angular velocity, I' is the final inertia, and ω' is the final angular velocity.
ω = 2.5 rev/s, ω' = 6 rev/s, i.e.:
Iω = I'ω'
I(2.5) = I'(6)
I' = 0.42I
moment of inertia increased by 0.42 change.
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an airplane is flying in a horizontal circle at a speed of 51.4 m/s. the 102 kg pilot does not want his radial acceleration to exceed 11.1 g. the acceleration of gravity is 9.8 m/s 2 . what is the minimum radius of the circular path?
Acc. to the given statement: The minimum radius of the circular path is 2335m.
What is Radius?Any line segment connecting a circle's or sphere's center to its perimeter is considered the object's radius.
What is acceleration (a)?Acceleration: the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it speeds up or decelerates.
What is the Gravity?The force that pulls items toward the center of a planet or other entity is called gravity. The force experienced by objects towards earth is called Gravity.
To calculate the minimum radius of the circular path we use the formula for max acceleration given below.
amax=v2/rmin
Solving and rearranging the formula for minimum radius, we get the following:
rmin =v2/ amax
now putting values acc to the given data:
rmin=51.42/11.1×9.81
rmin =2335 m
So, The minimum radius of the circular path is 2335m.
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What has a greater effect
on an object's kinetic energy-increasing its
speed by 50 percent or increasing its mass by
75 percent?
Answer:
kinetic energy by 50 percent
which power mode first goes into a low-power mode for computers, and then to hibernate mode when the system is almost out of power?
The User Account Control dialog box comes when you access one of your data files. You cannot change the desktop resolution setting because it is fixed.
There is no distinction between a user account and a user profile. Windows 10 Settings has taken the role of Windows Control Panel. The CPU processes instructions through a process known as "fetch-execute." The first instruction in the sequence is retrieved, executed (by, for instance, adding two numbers), and then the next instruction is retrieved, executed, and so on. System modal, modal, and modeless dialog windows are the three distinct varieties. Modal dialog windows are frequently used by programs to display messages and set up software. All open windows will be simultaneously minimized when you click the Show Desktop button.
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A traw rocket i launched with a net Force of 1. 5 N. The traw rocket ha a ma of 0. 005 kg. What i the acceleration of the rocket
The acceleration of the rocket is 300 m/[tex]s^{2}[/tex].
F = ma
Here, F = force, given = 1.5 N
m = mass, 0.005 kg
Put these values in formula, F = ma
a = F/m
a = 1.5/0.005
a = 300 m/[tex]s^{2}[/tex]
Therefore, the acceleration of the rocket is 300 m/[tex]s^{2}[/tex].
Acceleration, rate at which speed changes with time, in phrases of each speed and direction. A factor or an item moving in a straight line is accelerated if it accelerates or slows down.
Unit of acceleration is the meter in keeping with second according to second, m/[tex]s^{2}[/tex]. Definition. The newton is that pressure which, whilst acting on a mass of one kilogram, produces an acceleration of one meter per second per second.
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