What was the initial working hypothesis for how plants gained mass?

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of + 2.4 μC?

A bowling ball is dropped from rest. what is the ball's velocity after falling for 4 seconds?

If 2 grams of element X combine with 4 grams of element Y to form compound XY, how many grams of element Y would combine with 46 grams of X to form the same compound?

What would happen if the ozone layer were completely destroyed? A: X-rays and gamma rays would no longer get through the atmosphere. B: Meteorites would be able to fall through the atmosphere and would destroy life of all types.

Increasing the price of water is one way to prevent the abuse of the water supply by both consumers and industry. True False

Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car acceleration?

Why can crevasses in glaciers only be 50 meters deep? A. Plastic flow occurs below that depth. B. Glaciers cannot be thicker that 50 Meters. C. Surges prevent plastic flow below that depth. D. Basal slip occurs below that depth.

What are the changes to Earth's surface that occur as a result of plate movement

Two spaceships are approaching each other. (a) If the speed of each is 0.9c relative to Earth, what is the speed of one relative to the other?

Mechanical work is done an object when a force displaces the object in the direction of the force or a component of the force. True or false?