Which of the following particles has not been observed experimentally?
a. photon
b. graviton
c. antiproton
d. Z0 boson
b
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Uniform Circular Motion: A car goes around a circular curve on a horizontal road at constant speed. What is the direction of the friction force on the car due to the road?
A. tangent to the curve in the forward direction B. tangent to the curve opposite to the direction of the car's motion C. perpendicular to the curve outward D. perpendicular to the curve inward E. There is no friction on the car because its speed is constant.
A refrigerator has a coefficient of performance of 4 . If the refrigerator absorbs 30 cal of heat from the cold reservoir in each cycle, the heat expelled (in cal) into the heat reservoir is
a. 40.5 b. 37.5 c. 36.5 d. 34.5 e. 22.5
Momentum: Two satellites with equal masses of 100 kg are traveling toward each other in deep space. They have identical speeds of 0.600c. The satellites collide and somehow manage to stick together. What is the mass of the combined object after the collision?
A. 200 kg B. 225 kg C. 250 kg D. 275 kg E. 300 kg
The majority of Earth's atmosphere is found within which atmospheric layer?
A. stratosphere B. van Allen Belts C. troposphere D. ionosphere E. ozone layer