Which of the following correctly describes the formula for speed?

A. Speed equals direction plus time

B. Speed equals distance plus direction

C. Speed equals distance over time

D. Speed equals mass over time

How a diode can act as a capacitor?

A man drops a baseball off of the top of the Empire State Building. If the action force is the Earth pulling on the ball, then what is the reaction force?

Which statement best describes a relationship amongst hypotheses, theories, and laws? A hypothesis is used to explain laws and theories. A law is used to explain a hypothesis and theories. A hypothesis combines several theories.

List 3 different things a bus driver can do while driving to make the bus accelerate. This is for a physics class for 9th grade.

Johannes Kepler is best known for his work on planetary motion. a. True b. False

Determine the total mechanical energy of a 250 g baseball if it has a velocity of 30 m/s when it leaves the pitcher's hand 1.2m above the ground.

When distances were carefully measured from Earth to globular clusters above and below the Milky Way plane (where our view of them is not obscured by interstellar dust and gas), their distribution was found to be

Imagine you transfer heat into a gas. This heat splits up in two different ways: Additional thermal energy making the gas hotter and "fuel" for the gas to do work. Let's suppose, 64% of the transferred heat transforms into thermal energy.

How much heat is absorbed by a 61g iron skillet when its temperature rises from 5oC to 29oC?

Explain the relationship between motion and frame of reference.