If you set up an experiment with two different independent variables, then the results would be

A toy train rolls around a horizontal 1.0-m-diameter track. the coefficient of rolling friction is 0.10. how long does it take the train to stop if it's released with an angular speed of 40 rpm?

15 g of lead (specific heat = 0.128 J/g Celsius) at 120 Degrees Celsius is placed on a glacier of ice at 0 degrees Celsius. How much ice melts? (Lf of ice = 333 J/g)

Determine the kinetic energy of a 1000kg roller coaster car that is moving with a speed of 20.0m/s

A ballistic pendulum shoots a ball of mass 1 kg at initial velocity 13 m/s. if the mass of the pendulum is 8 kg how high does the pendulum go in meters? round your answer to two decimal places

A motor was overheating because of low voltage at its terminals. A transformer was installed to correct the problem. What is the secondary voltage of the transformer required to be in order to supply 240 volts to the motor?

Recent measurements of the expansion rate of the universe reveal that the expansion rate of the universe is doing something astronomers did not expect. What is that?

List three machines or devices that depend on gravity to work.

Daily summer solar radiation levels at polar latitudes are caused by the high intensity of radiation per unit surface area rather than by long periods of daylight.

Predict whether the hottest part of a room will be near the ceiling, in the center, or near the floor, given that there is a hot-air vent near the floor.

Does light always travel at the same speed?