In the bohr model of the hydrogen atom, the speed of the electron is approximately 2.48 * 106 m/s. find the central force acting on the electron as it revolves in a circular orbit of radius 4.8 * 10-11 m. answer in units of n.

A transformer supplies 60 watts of power to a device that is rated at 20 volts (rms). The primary coil is connected to a 120-volt (rms) ac source. What is the current I1 in the primary coil?

A piece of wood and a piece of steel are at the same temperature; however, the steel feels hotter. This is because the steel has

Which of the following statements about revitalization movements is incorrect? a. The purpose of revitalization movements is to reform society. b. Revitalization movements always fail because they require too much change to be tolerated. c.

What do hydroelectric plants use to generate electrical energy?

What is a strong, short-lived magnet created by a looped electrical current.

A space probe produces a radio signal pulse. If the pulse reaches Earth 12.3 seconds after it is emitted by the probe, what is the distance from the probe to Earth?

Do substances that heat up quickly have high or low specific heat capacity?

A substance has a specific heat of 0.870 J/g°C. It requires 2,000.0 joules to increase the temperature of 10.0 grams of the substance from its original temperature to its final temperature. By how many degrees did the substance increase? A 87.

How many earth years does it take mars to orbit the sun

Which represents a system that is almost completely closed?