A boy runs 30 m east, 40 m north, 50 m west. what is his net displacement?

Consider a weather balloon floating in the air. There are three forces acting on this balloon: the force of gravity is FG, the force from lift towards balloon is FL, and the force from the wind is labeled Fw.

how much chemical energy must be supplied to a car engine if we want it to produce 5000J of kinetic energy and it is 45% efficient

Skater 1 has a mass of 45 kg and is at rest. Skater 2 has a mass of 50 kg and is moving slowly at a constant velocity of 3.2 m/s [E]. Skater 3 has a mass of 75 kg and is moving quickly at a constant velocity of 9.6 m/s [E].

A scientist launches a 100 g ball from a catapult as part of an experiment. The ball travels at 500 m/s after launch. The catapult weighs 2,000 g and has a slight recoil. Which relationship best describes the recoil of the catapult

Ice cubes, icicles, snowflakes, and glaciers are water in ...

Enise is riding her bike and falls to the ground. During the collision, she hits both grass and cement. Which best explains why Denise had fewer injuries to the area of her body that hit the grass?

A rock is dropped into the Grand Canyon. It takes 18 seconds to hit the bottom. Calculate how deep the canyon is.

A change from one form of energy into another is called a. gravitational potential energy. b. work. c. conservation of energy. d. an energy transformation

4. An airplane must achieve a velocity of 71 m/s for takeoff. If the runway is 1000 m long, what must the acceleration be?

As the average kinetic energy of the particles in a gas increases, which of the following occurs?