What is less dense region of a compression wave

Friction exists only when two objects rub against each other. A. True B. False

Which is likely to produce the brightest spectra? A. Holographic gratings B. Reflection gratings on plastic C. Transmission gratings on glass D. Replica transmission gratings on plastic

A m=7.2 gram object is accelerated at a rate of a=2.9 m/s^2. What force (in millinewtons) does the object experience? No need to add the unit (already given).

The force you have to overcome to start an object moving is a. rolling friction b. static friction c. sliding friction d. air resistance

If you were creating a lamp by hand what type of material would you chose for the wiring and what material would you chose to coat the wiring? Why

A 6.0 kg box slides down an inclined plane that makes an angle of 39° with the horizontal. If the coefficient of kinetic friction is 0.19, what is the magnitude of the acceleration, in m/s2, of the box down the slope?

Identify the following as a suspension or a colloid. sand in water

A cyclist starts at a position of 0 m and takes 3 s to move east to a position of + 8 m. He then cycles west to a position of + 5 m which takes an additional 2 s. What is the cyclist's displacement? a. + 11mb. - 8mc. - 5m d. + 5m

What happens when you shoot a bullet into the sky?

If you want to lift a 5-kg box to a height of 2 meters, how much work must be done? O A. 2J O B. 50 J O C. 98 J O D. 100