A rock falls 30 m. Its KE before it strikes the ground is 4,392 J. What is the

mass of the rock?

A. 15 kg

B. 146 kg

C. 1.5 kg

D. 3.0 kg

Which equation is balanced? H2 + O2 + H2O + O2 H2 + O2 + H2O 2H2 + O2 + 2H2O 4H2 + O2 + H2O + O

Which are examples of negative feedback? Check all that apply

Suppose you have an isolated system in which two objects about to collide have equal and opposite momenta. If the collision is totally inelastic, what can you say about the motion after the collision?

A bicyclist rides with a constant speed of 7 m/s. What is his initial speed?

How do you know that waves sent from the sun to earth are not mechanical waves? Explain

A cartoon plane with four engines can accelerate at 8.9 meters per second squared

Convert 1087 ft/s to mi/hr

Using the atomic symbol above report how many protons, neutron, and electrons an atom of neon contains.

Which of the following is not shorthand to describe one of the three types of ecological relationships? +/+ -/+ +/0 -/0

Which is a characteristic of an electromagnetic wave?