A ball of mass 0.5kg is released form rest at a height of 30m. how fast is it going when it hits the ground? acceleration due to gravity is g-9.8m/s^2

How much work (in j) must be done to lift a stack of bricks, which has a mass of 400 kg, from the ground to a height of 3 m? (g = 10 m/s2) ?

What is the recommended amount of time that a teenager should be participating in physical activity A: 30 min B: 60 min C: 45 min D: 15 min

What's the net force acting on an 18-kg object if an acceleration of 3.0 m/s2 is produced?

A 68.4-g sample of potassium chloride was added to 200.0 g of water at 20oC. Is the solution saturated, unsaturated, or supersaturated? Use Figure 8-2 to answer this question.

How do you solve this system of equations. x+y-z = 0 5.08x - 9.96y = 5.31 9.96y - 14.72z = - 10.37?

Matching fossils go with what hypothesis?

The most powerful tugboats in the world are built in Finland. Theseboats exert a force with a magnitude of 2.85 * 10^6N. Suppose one ofthese tugboats is trying to slow a huge barge that has a mass of 2.0 * 10^7kg and is moving with a speed of 3.

Which of the following describes a chemical change A. burning paper B. freezing water C. melting ice D. bending a wire

Which of the following must be true of a quantized measurement? A. It cannot be precisely known. B. It can only be a measurement of energy. C. It must have a smallest possible value. D.

A silver bar 0.125 meter long is subjected to a temperature change from 200°C to 100°C. What will be the length of the bar after the temperature change? A. 0.0000189 meterB. 0.00002363 meterC. 0.124764 meterD. 0.00023635 meter