Any external force that acts against movement is called

A. gravity

B. efficiency

C. resistance

D. momentum

Determining the pH of substances such as purple grape juice and catsup using test strips can be difficult. Why?

Which of the following is the correct definition of thermal energy? A. energy resulting from the flow of charge particles, such as electrons or ions B. energy created by sound waves C.

Who was Stephen Hawking?

Does speed, velocity or both describe a rate?

A bicycle is a compound machine, true or false

Acceleration is a scalar quantity true or false

Find a numerical value for rhoearth, the average density of the earth in kilograms per cubic meter. Use 6378km for the radius of the earth, G=6.67*10-11m3 / (kg⋅s2), and a value of g at the surface of 9.80m/s2.

The driver of a car traveling at 32 m/s applies the brakes and undergoes a constant deceleration of 2.25 m/s^2.

The ability of an object to vibrate by absorbing energy at its natural frequency is called?

A hurricane in the Gulf of Mexico to 15 hours to travel 360 kilometers. What is the average speed of this hurricane in kilometers per hour?