A 2.00 kg object is dropped from a height of 20.0m and loses 25.0 J of energy due to air resistance as it falls. What is its speed just before it hits the ground?
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A 2.00 kg object is dropped from a height of 20.0m and loses 25.0 J of energy due to air resistance as it falls. What is its speed just before it hits the ground?
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- A 5.0 kg object is moving at 2.29 m/s? By what factor does its kinetic energy change if its speed doubles? Answer: timesA 0.40 kg block can slide up and down a rough 10-m-high, 30-m-long slope. At the bottom, a stiff spring with spring constant 800 N/m is compressed 0.50 m and used to launch the block up the slope. The friction force on the block from the slope is 1.2 N. What is the speed of the block when it reaches the top of the slope? When apply the following energy principle to this question, assuming the system is block+earth+spring+slope, which of the energy term is positive? Select all apply. ΔK + ΔUg + ΔUsp + ΔEth + ΔEch = WexternalA 0.475-kg ball is thrown straight downward with a speed of 2.21 m/s from a platform 11.2 m above the ground. Air resistance does -6.81 J of work on the ball during its decent. What is the speed of the ball (in m/s) just before it hits the ground?
- 47.A particle of mass 4.0 kg is constrained to move along the x-axis under a single force F(x)=-cx³, where c= 8.0 N/m³. The particle's speed at A, where x = 1.0 m, is 6.0 m/s. What is its speed at B, where x = -2.0 m? SolutionA force of 16 N is applied to a 4.5 kg object (initially at rest) for a time of 5.6 s. What is the speed of the object afterwards? Assume a level, frictionless surface.A 72 kg student traveling in a car with a constant velocity has a kinetic energy of 2.0 104 J. What is the speedometer reading of the car in km/h?
- An object of mass 2.0 kg is dropped from a height of 1.0 metres. It lands with a speed of 1.8 m/s. How much energy was lost due to air resistance? (Give your answer to 2 s.f., expressed as a magnitude) Your Answer: AnswerA toy robot powered by an electric motor accelerates from rest to 0.740 m/s in 20.0 ms. The total mass of the robot is 825 g. What is the average power (in W) delivered to the robot by the motor during its acceleration?