What type of waves are used to transmit cellular telephone messages?

A 60-gallon water heater is initially filled with water at 66°F. Determine how much energy, in Btu, needs to be transferred to the water to raise its temperature to 104°F. Given: The water properties at an average water temperature of 85ºF rho = 62.

Magnetic fields affect certain metals but especially the metal

A football player pushes against another player trying to block him from moving any farther down the field. Which term best describes this example? milar you would want to mention that

Why are infrared telescopes useful for exploring the structure of the galaxy? why is it important to make observations at both near-infrared and far-infrared wavelengths?

A pebble is dropped into a pool of water and generates a wave that has a frequency of 7 waves/sec and a speed of 2.94 m/s. What is the wavelength

The engine that powers a crane burns fuel at a temperature of 1500 oC. It is cooled by air at a temperature of 20 oC. The crane is used to lift a 1000 kg steel girder 30 m into the air.

The portion of a light ray that falls on a surface is a/an

Give the definition for diffusion. (A) gas molecules mix unequally average distance between collisions (B) gas molecules escape from a container into a vacuum through a small hole (C) gas molecules mix equally (D) gas molecules spread out in a

As resistance goes up, what happens to the current?

1. A 0.828-nm photon collides with a stationary electron. After the collision, the electron moves forward and the photon recoils backwards. a) Find the momentum of the electron. b) Find the kinetic energy of the electron.