Explain why and how theories may be changed or replaced over time.

Janet jumps off a high diving platform with a horizontal velocity of 2.43 m/s and lands in the water 1.3 s later. How high is the platform? The acceleration of gravity is 9.8 m/s2.

How much force is needed to accelerate a 1000Kg car at a rate of 3m/s2?

Charlie throws a ball up into the air. While the ball is airborne, which is the greatest force acting on the ball to slow it down? A. applied force B. friction force C. gravitational force D. normal force

What is the smallest number of whole logs (rho = 715 kg/m3, radius = 0.0815 m, length = 2.76 m) that can be used to build a raft that will carry four people, each of whom has a mass of 84.0 kg?

How to find initial velocity in projectile motion problems when you are not given the vlocity?

A measure of the energy of motion of the particles in a substance is its

What is the final velocity of the combined bumper cars A 225 kg red bumper car is moving at 3.0 m/s. It hits a stationary 180 kg blue bumper car. The red and blue bumper cars combine and hit a stationary green bumper car of mass 150 kg.

0.4-L glass of water at 20°C is to be cooled with ice to 5°C. The density of water is 1 kg/L, and the specific heat of water at room temperature is c = 4.18 kJ/kg·°C. The specific heat of ice at about 0°C is c = 2.11 kJ/kg·°C.

Regions in a sound wave where particles are farthest apart are called

What will happen to thermal condictivity of a substance if its thickness is doubled? Also give reason.