The reason we have periods of darkness that we call night is because

A red train travelling at 72 km/h and a green train travelling at 144 km/h are headed toward each other along a straight, level track.

What is meant by having a magnetic property?

A student throws a set of keys vertically upward to his fraternity brother, who is in a window 4.00 m above. the brother's outstretched hand catches the keys 1.50 s later.

This type of tissue appears empty but is actually the storehouse of energy, while protecting and insulating many organs.

Modern wind turbines are larger than they appear, and despite their apparently lazy motion, the speed of the blades tips can be quite high - many times higher than the wind speed. a typical modern turbine has blades 56 m long that spin at 13 rpm.

What are the forces that make an object move

Which causes a rainbow in the sky? a. Sunlight (white light) is refracted as it passes through different layers in the atmosphere. b. Sunlight (white light) refracts when it passes through droplets of water in the atmosphere. c.

A solenoid used to produce magnetic fields for research purposes is 2.4 m long, with an inner radius of 30 cm and 1500 turns of wire. When running, the solenoid produced a field of 1.1 T in the center.

Which statement correctly describes the nucleus of the atom? The nucleus of the atom contains the electrons. The nucleus of the atom is mostly empty space. The nucleus of the atom surrounds the center of the atom.

Inner planets that are composed mainly of rock and metal are called