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- An object is propelled along a straight-line by a force. If the net force were doubled, its acceleration would
- A 10-N falling object encounters 10 N of air resistance. The net force on the object is
- A feather and a coin dropped in a vacuum fall with equal
- Two pool balls, each moving at 2 m/s, roll toward each other and collide. Suppose after bouncing apart, each moves at 4 m/s. This collision violates conservation of
- The ground speed of an airplane that has an airspeed of 100 km/h when it is in a 100-km/h crosswind is
- Without air resistance, a projectile fired horizontally at 8 km/s from atop a mountain will
- Consider an escalator at an angle of 45 degrees above the horizontal that moves with a velocity of 2.0 m/s. The vertical component of its velocity is about
- A 5000-kg freight car runs into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg Car?
- A sandbag is motionless in outer space. A second sandbag with 3 times the mass moving at 12 m/s collides with it and they stick together, and move at a speed of
- A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is
- Two projectiles are fired at equal speeds but different angles. One is fired at an angle of 30 degrees and the other at 60 degrees. The projectile to hit the ground first will be the one fired at(neglect air resistance)
- A bullet fired horizontially hits the ground in 0.5 s. If it had been fired with twice the speed in the same direction, it would have hit the ground in
- Strictly speaking, if any electrical device in your car is turned on(such as an air conditioner, headlights, or even a radio), more gasoline is burned by the engine. This statement is
- In the vacuum of outer space, there is no
- A "weightless" astronaut in an orbiting shuttle is
- A lunar month is about 28 days. If the Moon were farther from the Earth than it is now, The lunar month would be
- A projectile is fired vertically from the surface of the Earth at 10 km/s. The projectile will
- Consider a monkey wrench released at rest at the far edge of the solar system. Suppose that it drops to the Earth by virtue of only Earth's gravity. It will strike Earth's surface with a speed of about
- A rocket fired vertically at 11.2 km/s will escape the Earth. If it is instead fired horizontally at this speed, free from obstructions, will it still escape the Earth?
- What prevents satellites such as the space shuttle from falling?
- The average momentum of a 70-kg runner who covers 400 m in 50 s is
- A boxer punches a sheet of paper in midair and brings it from rest up to a speed of 40 m/s in 0.05 s. If the mass of the paper is 0.01 kg, the force of impact on the paper is about
- A projectile is thrown into the air at an angle of 50 degrees and lands on a target that is at the same level the projectile started. It will also land on the target if it is thrown at an angle of
- The reason a bullet has more kinetic energy than the recoiling rifle from which it is fired is because the force on the bullet acts over a longer
- An open freight car rolls friction-free along a horizontal track in a pouring rain that falls vertically. As water accumulates in the car, its speed

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