A train travels 59 kilometers in 3 hours, and then 74 kilometers in 5 hours. What is its average speed?

Which of the following could be used to send an receive electromagnetic waves at the same time?

You throw a baseball straight up in the air so that it rises to a maximum height much greater than your height. Is the magnitude of the ball's acceleration greater while it is being thrown or after it leaves your hand? Explain.

Amplitude is a measure of a waves A; Speed B; Distance C; Energy D; Frequency

A 6.0-kg box slides down an inclined plane that slopes 39° to the horizontal. The box accelerates at a rate of 3.1 m/s^2. What is the coefficient of kinetic friction between the box and the surface of the inclined plane? 0.55 0.40 0.16 0.48

Which cannot be done by a machine A. increase force B. Increase work C. change direction of force D. increase velocity

Does air resistence decrease with speed

In one area, the lowest angle of elevation of the sun in winter is 23 ° 18 '. Find the minimum distance, x, that a plant needing full sun can be placed from a fence 4.63 ft high.

A wave has a wavelength of 50 m and a speed of 200 m/s. What is the frequency of this wave in hertz?

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?

Which of the following best describes the earth's average surface temperature for the past 900,000 years? A. a steady warming trend B. fairly steady temperatures until recently C. prolonged periods of cooling and warming D.