
How much kinetic energy does a 0.30-kg stone have if it is thrown at 44 m/s?...
a) A 75.2-kg jogger runs with a velocity of 2.85 m/s. How much kinetic energy does the jogger have? b) During a football game, a 70-kg running back runs with a speed of 5.15 m/s while a 120-kg lineman runs with a speed of 2.20 m/s. Which player has the greater inertia? Why?
Kinetic energy is the energy of motion. How much kinetic energy does a spherical asteroid with a 1 km diameter have if it is made out of iron (has a density of about 8 kg m-3) and hits Earth at a relative velocity of 10 km s-1?
4. Kinetic energy is the energy of motion. How much kinetic energy does a spherical asteroid with a 1 km diameter have if it is made out of iron (has density of about 8 kg m-3) and hits Earth at a relative velocity of 10 km s-1? Convert your answer to megatons of TNT (1 megaton of TNT = 4.18 x 1015 joules).
A stone with mass m = 0.700 kg is thrown vertically upward into the air with an initial kinetic energy of 610 J. The drag force acting on the stone throughout its flight is constant, independent of the velocity of the stone, and has a magnitude of 0.600 N. What is the maximum height reached by the stone? What is the speed of the stone upon impact with the ground?
1. A stone is thrown vertically upward with a speed of 24.0 m/s. (a) how fast is it moving when it is at a height of 13.0 m? (b) how much time is required to reach this height? 2. A helicopter is ascending vertically with a speed of 5.40 m/s. At a height of 105 m above Earth, a package is dropped from the helicopter. How much time does it take for the package to reach the ground?
A 10-kg stone is thrown straight upward with the initial speed of 20.0 m/s. How high will it go if the average force of air resistance opposing its motion equals 0.20 N?
A stone is thrown vertically upward with a speed of 12.0 m/s from the edge of a cliff 75.0 m high; (a) How much time does it take in order for the stone to reach the maximum height? (b) What is the maximum height measured from the edge of the cliff? (c) How much time (from the instant the stone is projected) does it take to reach the bottom of the cliff? (d) What is its speed just before reaching...
1. How much kinetic energy does an object of mass m traveling with a velocity vx in the x-direction have? 2. How much kinetic energy does an object of mass m traveling with a velocity ~v = vx ˆi + vy ˆj have? 3. Since the pythagorean theorem states that v ^2 = v ^2 x + v ^2 y , we can write the kinetic energy as K = 1/2mv^2 x + 1/2mv^2 y . Does this mean that...
How fast (in m/s) must a 2,613 kg elephant move to have the same kinetic energy as a 62 kg sprinter running at 11 m/s?
A stone is thrown horizontally at a speed of 5.0 m/s from the top of a cliff 79.3 m high. (a) How long does it take the stone to reach the bottom of the cliff? (b) How far from the base of the cliff does the stone hit the ground? (c) What are the horizontal and vertical components of the stone's velocity just before it hits the ground? m/s (vertical) m/s (horizontal)