A car accelerates at 2 m/s2. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 20 m/s? A. 2 seconds B. 10 seconds C. 20 seconds D. 40 seconds E. none of the above

A hydraulic system for a dentist's chair is designed to be able to lift 3,112 newtons. The surface area over which this force is applied is 707 cm 2. What force must be applied to the activator end of the system if the button has a surface area of 3.

If two objects of unequal mass collide, both objects will continue to move in the direction ofL A. the smaller object's momentum B. the larger object's momentum C. the smaller object's resistance D. the larger object's resistance

An 8000-kg engine pulls a 40,000 kg train along a level track and gives it an acceleration a1 = 1.20 m/s 2. What acceleration (a2) would the engine give to a 16,000-kg train?

Carbon-14 has a half-life of 5730 years after how many half lives will 120 g of carbon-14 decay to 15 g A. One B. Two C. Three D. Four

On a cool morning, Uyen's breath can form a cloud when she breathes out. Which changes of state are most responsible for Uyen seeing her breath in this way?

Explain why your weight would be less in the moon than on earth even though your mass would not change. Use the law of universal gravitation in your explanation.

ions are atoms or groups of atoms that have a positive or negative charge. which of the following statements is true of ions?

1. According to the nebular theory, the solar system formed from? A. accretion of protoplanets. B. a large, thin cloud of dust and gas. C. colliding planetesimals. D. all of the above 2.

What is the difference between tangential acceleration and centripetal acceleration?

A ball rolls down a ramp. The ball has a mass of 1 kg and it has 18 joules of kinetic energy. What is the ball's speed?