All matter in the Universe consists of many substances called elements.

true or faluse

When the temperature if the air is 25 degrees celsius, the velocity of a sound wave traveling through the air is approximately

If planet A is four times as far from the sun as planet C, then the period of its orbit will be__ times as long

You can jump 3 m (10 feet) off of a diving board and into a swimming pool and be uninjured. However, if you jumped from the same height onto concrete it would be very bad. Use principles of impulse and momentum to explain why this is the case.

A ball traveling with an initial momentum of 5.1 kgm/s bounces off a wall and comes back in the opposite direction with a momentum of - 4.3kgm/s. What is the change of momentum of the ball? What impulse is required to produce this change?

The power needed for a 1000 kg car to climb a 5 degree slope is 20,000 Watts. How long did it take if the distance along the slope is 70 m? You may assume the friction and air resistance is negligible.

given that a car's distance from a stop sign t seconds since it started moving is represented by d=t2-2t determine the car's average speed over each interval of elapsed time

A ball hits a wall. What is true about the magnitude of the force experienced by the ball compared with the force experienced by the wall? OA. The ball experiences more force than the wall. OB. The ball experiences less force than the wall.

A swimmer jumps from a waterfall thats is 8.5 m high from the lake below. How fast must he run horizontally to dive 2.5m away from the base of the waterfall?

What happens (as far as energy goes) when a molecule of gas strikes the wall of a container?

The boom of a fire truck raises a fireman (and his equipment - total weight 280 lbf) 60 ft into the air to fight a building fire.