A child drops a ball from a window. The ball strikes the ground in 3.0 seconds. What is the velocity of the ball the instant before it hits the ground?

A spring with k = 500 N/m stores 704 J. How far is it extended from the equilibrium position

You are on a train traveling east at speed of 16 m/s with respect to the ground. Your friend is sitting on another train traveling west at 12 m/s. As you walk toward the back of your train at 2.

If a bouncing ball has a total energy of 20 j and a kinetic energy of 5 j, the ball's potential energy is ...

which of the following is not considered a physical property? the density of copper or the toxicity of an acid

Lexy throws a dart with an initial velocity of 25m/a at an angle of 60 degrees relative to the ground. What is the approximate vertical component of the i ritual velocity?

When blue light of wavelength 450 nm falls on a single slit, the first dark bands on either side of center are separated by 45.0

An object is moving east, and its velocity changes from 65 m/s to 25 m/s in 10 seconds. Which describes the acceleration? 4 m/s2 in negative acceleration 4 m/s2 in positive acceleration 9 m/s2 in positive acceleration 9 m/s2 in negative acceleration

Two students walk in the same direction along a straight path at a constant speed-one at 0.90 m/s and the other at 1.90 m/s. •How far would the students have to walk so that the faster student arrives 5.50 min before the slower student? A.) 460s B.

During the process of accretion, each planet-in-the-making, or proto-planet, grew in size and mass. The amount of gravity for the proto-planets is best represented by which graph?

Theories and Laws. • How are they alike? • How are they different? • Can you explain why scientific theories will change over time? • Give an example of a scientific theory that has changed.