A pebble is dropped from a cliff. Neglecting air resistance, if the rock falls for 4 seconds. How fast is it moving?

The most likely region of the radio spectrum for communication with other civilizations is in the "water hole." What part of the spectrum is this?

When the particles in a medium vibrate perpendicular to the direction the wave is traveling, this type of waves is called a: A. Transverse wave B. Longitudinal wave C. Surface wave D. Tidal wave

An elevator car, with a mass of 450 kg is suspended by a single cable. At time = 0s, the elevator car is raised upward. The tension on the cable is constant at 5000N during the first 3 seconds of operation.

Niels Bohr's theory was based on evidence from a beam of particles that scattered after hitting thin gold foil. Evidence that an atom will actually emit colors when heated. The experimental results of other scientists.

Comparing sound waves with different frequencies and wavelengths traveling through air, 1. the speed of the wave doesn't depend on the frequency or the wavelength. 2. the higher the frequency, the greater the amplitude of the wave. 3.

As the army approached the bridge into the city, the commander told them to break step. He did not want the soldiers to march in cadence.

Plaskett's binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. This statement implies that the masses of the two stars are equal (see figure below).

A police car drives with a constant speed of 60 m/h. How long will it take to travel a distance of 180 kilometers?

What force is responsible for your sensation of weight?

Science fiction movies that include explosion sound effects for battles in space are not scientifically correct. Why is this? A. The sound from an explosion can only be transmitted by air. B.