Question 1 a ball is thrown straight up with a speed of 30, Ask an Expert

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Question 1 A ball is thrown straight up with a speed of 30 m/s. How high will it be above its initial height after 2.5 s?

Question 2 A 20 gram bullet is moving at a speed of 140 m/s when it strikes a large block of wood and lodges 3.0 cm into the wood. What is the magnitude of the average force decelerating the bullet during this event?

Question 3 A wheel with rotational inertia of 2.0 kg?m2 is spinning at a rate of 3.0 rev/s. What average torque would be required to stop this wheel in at time of 10.0 s?

Question 4 A balloon holds 240 m3 of helium. ?air = 1.29 kg/m3 ?He = 0.197 kg/m3 What is the maximum weight (empty balloon + cargo) that the balloon can lift?

Question 5 A 2.0-kg mass moves with a speed of 5.0 m/s. It collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses after the collision?

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