What causes thunder?

a. static electricity in the air

b. the sudden heating of the air by a lightning bolt

c. the movement of raindrops and hail within the cloud

d. the formation of raindrops out of rapidly condensing water vapor?

What is the symbol for the speed of light? A. c B. l C. s D. v

Which factor has no effect on the motion of a mass on a spring? displacement mass period velocity acceleration

In the formula 4h²o how many total hydrogen atoms are there

Assume that at t1=0.25s the velocity of the object is v1=5.0cm/s. find the following velocities of the object: v0 at t0=0.0s, v2 at t2=0.50s, v3 at t3=0.75s, and v4 at t4=1.0s.

Which of the following is true of machines? A. Machines increase the amount of force required to do a task. B. Machines reduce the total amount of work required to do a task. C. Machines increase the total amount of work required to do a task. D.

Inert gas used to make bright city lights True or False

A boulder on top of a cliff has a potential energy of 12400J. How high above is the boulder?

If the graph represents speed what is measured on the x and y axes

It is difficult to lift a heavy stone than the lighter one on the earth, why?

The vapor pressure of ethanol at 25 degrees C is 7.83 kPa. Calculate the vapor pressure in atm. Round answer to 3 significant digits.