Two identical cars are traveling around the same curve on a highway. One of them is moving at 60 mph, and the other is moving at 30 mph. The centripetal force acting on the car moving at 60 mph is __________ the value of the centripetal force acting on the car moving at 30 mph
a. one quarter
b. one half
c. the same as
d. twice
e. four times
E
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The star Betelgeuse appears red; the star Rigel appears blue. What accounts for this difference? a. Betelgeuse and Rigel have different chemical compositions
b. Betelgeuse is moving away from Earth, Rigel is moving toward Earth. c. Betelgeuse is moving toward Earth, Rigel is moving away from Earth. d. The surface of Betelgeuse is hotter than the surface of Rigel. e. The surface of Betelgeuse is cooler than the surface of Rigel.
An effective theory must:
A) have been proven. B) must have been around for centuries or longer. C) be continuously tested. D) include mathematical formulae.
The four states of matter are solid, fluid, gas, and plasma
a. True b. False Indicate whether the statement is true or false
When a football in a field goal attempt reaches its maximum height, how does its speed compare to its initial speed?
A) It is zero. B) It is less than its initial speed. C) It is equal to its initial speed. D) It is greater than its initial speed. E) Cannot be determined without additional information.