A train travels 53 kilometers in 4 hours, and then 90 kilometers in 3 hours. What is the average speed

two small balls are suspended on parallel threads of the same length so that they touch each other in the vertical position. the mass of the first ball is 0.4kg and the mass of the second ball is 200g.

A swing oscillates 8 times in 12 seconds what is its period what is its frequency

A device to measure electrical potential energy difference, or voltage, is called a (n) a. ammeter. b. voltmeter. c. series meter. d. Ohm meter.

Why are bells made up of metals instead of wood?

The angle of incidence and angle of reflection are measured relative to the

Express 9.39 x 109 seconds in terms of days

What is the energy equivalent of 5.0 kg of mass? be sure to show all work to support your answer?

An ant carries food at a speed of 1 cm/s. How long will it take the ant to carry a cookie crumb from the kitchen table to the ant hill, a distance of 50 m? Express your answer in seconds, minutes and hours.

What must you know in order to determine the gravitational force between two objects?

When seen from an airplane, a rainbow sometimes forms a complete circle. When this happens, the plane's shadow is a. in the center of the rainbow. b. totally outside the rainbow. c. in the upper part of the rainbow. d. Nowhere. There is no shadow. e.