An 80 kg skateboarder moving at 3 m/s pushes off with her back foot to move faster.

If her velocity increases to 5 m/s, what is her change in kinetic energy as a result?

J

How much work did she perform?

J

A box is sliding up an incline that makes an angle of 14.0° with respect to the horizontal. the coefficient of kinetic friction between the box and the surface of the incline is 0.180. the initial speed of the box at the bottom of the incline is 2.

A 0.500 kg rock is whirled in a vertical circle of a radius 0.60 m. the velocity of the rock at the bottom of the swing is 4.0 m/s. what is the acceleration A 3.3 m/s^2 B 26.6 m/s^2 C 13.3 m/s^2 D 6.6 m/s^2

When two waves in the same medium hit each other, the resulting displacement of the medium is when two waves in the same medium hit each other, the resulting displacement of the medium is always larger than the displacement due to either wave acting

While wearing rubber-soled shoes, you rub a helium balloon on your sweater. the balloon becomes negative charged. now release the balloon. when the balloon is at the ceiling, you are

A 6,000-km undersea glass fiber phone line crosses the Atlantic ocean connecting the US and France. (a) How long does it take for a message to transverse this link?

Why did the chicken cross the road.

A 98.1 kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.69 rad/s. A monkey drops a 9.29 kg bunch of bananas vertically onto the platform.

7. A type of non-renewable energy would be: O wind O petroleum O water solar

A refrigerator is a system. The energy input into the refrigerator system (in the form of electricity) is the same as the amount of energy output from the system. Which of the following best describes the energy output of the system?

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.