Compared with a car moving at some original speed, how much work must the brakes of a car supply to stop a car that is moving twice as fast.

What does the blue arrow in the remote control box represent?

If only 10% of the energy at one trophic level is passed on the next, what happens to the rest?

The force of gravity acting on a body is 675 newtons. Find the mass of the body to the nearest kilogram. A. 15 kg B. 1,488 kg C. 69 kg D. 6,615 kg

A thin 2 m long string with mass 10 g is stretched between two ends. The string vibrates in the second harmonic which has frequency 50 Hz, and the amplitude of the oscillations is 3 cm.

A pendulum makes 40 vibrations in 20 seconds. Calculate its period?

Which of the following do not involve a direction? Check all that apply. A. Time B. Velocity C. Distance D. Acceleration

What does deltaX mean in physics?

Which activity involves using fossil fuels directly or indirectly? 1) eating fresh fruit for a snack 2) cooking hot dogs on a campfire 3) using crayons to color 4) walking to school

Which of the following objects would have the most inertia? A. A sphere with a radius of 5 cm and a mass of 34 grams. B. A sphere with a radius of 4 cm and a mass of 15 grams. C. A sphere with a radius of 8 cm and a mass of 27 grams. D.

A boy slides a book across the floor using a force of five and over a distance of 2M what is the kinetic energy of the book after he slides at assume there is no friction