All waves are produced by something that is doing this

Estimate the number of table tennis balls that would fit (without being crished) into a room that is 4 m long, 4 m wide, and 3 m high. assume that the diameter of a hall is 3.8 cm

Water has a high specific heat capacity. This means that a lot of energy is needed to change its temperature. True or false?

A object of mass 33 is dropped from a height of 85 meters. Calculate the average power developed by the object in falling through this distance. Take g as 9.81 m/s^2 give the answer in watts to three significant figures

Which one of the following polarizations of light is impossible for mass less photons? a. Transverse b. Circular c. Longitudinal d. Elliptical

How are nuclear chain reactions controlled in nuclear power plants?

Using the atomic symbol above report how many protons, neutron, and electrons an atom of neon contains.

Which of the following is not shorthand to describe one of the three types of ecological relationships? +/+ -/+ +/0 -/0

Which is a characteristic of an electromagnetic wave?

What does the ozone layer absorb? a. Microwaves c. UV radiation b. X-rays d. Infra-red radiation

An object is undergoing shm with period 0.900 s and amplitude 0.320 m. at t = 0 the object is at x = 0.320 m and is instantaneously at rest. calculate the time it takes the object to go (a) from x = 0.320 m to x = 0.160 m and (b) from x = 0.