how much chemical energy must be supplied to a car engine if we want it to produce 5000J of kinetic energy and it is 45% efficient

An ice cube melts into liquid water. Then, the liquid water evaporates into water vapor. The ice cube melting is an example of a and the water evaporating is an example of a

A Journey through the solar system

A certain metal having a work function of 5.4 eV is illuminated with light of frequency 2.7 x 1015Hz. Determine the stopping potential (in V) that is required to stop the most energetic ejected electrons.

An electricity-generating station needs to deliver 20 MW of power to a city 1.0 km away. A common voltage for commercial power generators is 22 kV, but a step-up transformer is used to boost the voltage to 230 kV before transmission.

Calculate the potential difference two charges when 6 joules of energy is needed to bring a charge of 0.01C close to the other charge.

What does Kepler's second law state? A. Planets travel in ellipses. B. Planets sweep equal areas in equal times. C. A planet's apparent backward movement is termed retrograde motion. D.

Why do charges build up in a cloud

How does the wave model of electrons orbiting the nucleus account for discrete energy values?

An ecosystem is all the populations of organisms that live together and A. the microorganisms that depend on them. B. the organisms that generate energy from sunlight. C. the physical factors with which they interact. D.

Which statement about magnetic poles is accurate? A) Same magnetic poles attract, while different magnetic poles repel. B) Same magnetic poles attract, while different magnetic poles attract.