when a book falls from a shelf to the ground without anyone pushing on it, no work is done to the book. True or False

A fl oor polisher has a rotating disk that has a 15-cm radius. The disk rotates at a constant angular velocity of 1.4 rev/s and is covered with a soft material that does the polishing.

How much work must be done to bring three electrons from a great distance apart to 3.5*10-10 m from one another (at the corners of an equilateral triangle) ?

A ball pushed with a force of 13.5 N accelerates at 6.5 m/s^2 to the right. What is the mass of the ball?

A car takes 8s to increase its velocity from 10m/s to 30m/s. what is its average acceleration?

Energy from the sun comes from fusion. What happens during that reaction? A. Carbon dioxide turns into oxygen B. hydrogen turns into helium C. helium turns into hydrogen D. oxygen turns into carbon dioxide

Which of these rocks are formed by volcanic activity? select the two correct answers. a. marble b. basalt c. limestone d. granite e. sandstone

Which source is most likely an authority on the subject? Dr. Vale, a pediatrician, discusses electrical circuitry on her home-improvement website. Jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches.

What methods can be used to break down substances into elements

8. A gas is contained in a horizontal piston-cylinder apparatus at a pressure of 350 kPa and a volume of 0.02 m3. Determine the work done by the piston on the gas if the cylinder volume is increased to 0.15 m3 through heating.

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?