A spring has an unstretched length of 10 cm. it exerts a restoring force f when stretched to a length of 11 cm. part a for what length of the spring is its restoring force 3f?

A person riding on a bus hears the sound from a horn on a car that is stopped. What is different about the sound when the bus is approaching the car compared to when the bus is moving away from the car?

List three observations that show how light carries energy.

The direction of the electric field is everywhere tangent to the field-lines, in the sense of the arrows on the lines.

If the mass of an object is 100kg and the acceleration due to gravity is 9.8m/s^2 what is the weight of the object

What happens during one half-life of a radioactive isotope?

Strictly speaking, as more and more skyscrapers are built on the surface of the Earth, does the day tend to become longer or shorter? And strictly speaking, does the falling of autumn leaves tend to lengthen or shorten the 24-hour day?

For each description, choose the fault it describes. Fault types may be used more than once. A. Strike-Slip fault B. Reverse Fault C.

If a sugar has 11 oxygen atoms, how many hydrogen atoms does it contain?

Why do clouds tend to form around 3:00pm and 6:00am?

Why does sound travel faster under water?