When you drop a rock from a cliff, which of the following happens?

Only the rock falls to the Earth

Only the Earth falls up to meet the rock

The rock and the Earth fall towards each other

None of the above

How did the discovery of subatomic particles affect the classification of reactions?

When a loose brick is resting on a wall, it has energy. When the brick is pushed off the wall and is falling down, the amount of energy is decreasing while the amount of energy is increasing.

A child sits on the edge of a spinning merry go round that has a radius of 1.5. The child's speed is a 2m/s. What is the child's acceleration?

The engine of a motorcycle did an amount of work W while reaching a speed of v. If the engine could perform work 4W then the final speed would be?

What shall be the effect on the least count of spherometer if number of divisions on its circular scale be doubled?

What is the density of a rock which has a mass of 35 grams and a volume of 7.0 cubic centimeters?

Which statement best describes the relative conductivity of semiconductors? a. They are the most conductive elements. b. They are the least conductive elements. c. They are more conductive than metals but less conductive than nonmetals. d.

A tire swing is released from some initial height such that the speed of the tire at the bottom of the swing is 2.5 m/s. What is the initial height of the tire? Note: g = 9.8 m/s2 A 0.13m B 0.16m C 0.32m D 3.1 m

Paleoclimatologists study the climate and its changes throughout earths history. what observation by paleoclimatologists led scientists to predict that the average temperature of the planet is rising due to the combustion of fossil fuels?

Which is bigger, a kilometer or a mile?