1.If you are about to be struck by lightning, your hair might stand on end.

a. true
b. false

2.Not every lightning strike produces thunder.

a. true
b. false

3.Lightning can sometimes occur on hot and humid summer evenings when there are no thunderstorms.

a. true
b. false

4. For a negative polarity lightning strike, in which direction does the stepped leader travel (upward or downward)

a. true
b. false

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

Which are true about beta reactions? there will be more than one answer. a. it has no change b. it doesn't change the mass of the number c. it has a mass of 0.0005 atoms d. it causes transmutation.

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s