According to Newton's laws, if an object is moving in a straight line with a constant speed:
A) it will continue to do so until it runs out of energy.
B) it will continue to do so unless compelled by an outside force to do otherwise.
C) it will move more and more slowly, in the same direction, until it comes to a complete stop.
D) it will eventually come to a stop and reverse directions.
E) it will gradually move faster and faster until it reaches the speed of light.
Ans: B) it will continue to do so unless compelled by an outside force to do otherwise.
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A. 20 g B. 14 g C. 24 g D. 26 g
At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
A. 16 m/s B. 45 m/s C. 23 m/s D. 20 m/s E. 36 m/s
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If the hydrogen atom is in the n = 4 state, what is the largest number of photons that can be emitted as the atom goes back to the ground state?
A) 0 B) 4 C) 2 D) 3 E) 1 F) 5