A 2.5-kg box, sliding on a rough horizontal surface, has a speed of 1.2 m/s when it makes contact with a spring (see the figure)
The block comes to a momentary halt when the compression of the spring is 5.0 cm. The work done by the friction, from the instant the block makes contact with the spring until is comes to a momentary halt, is -0.50 J.
(a) What is the spring constant of the spring?
(b) What is the coefficient of kinetic friction between the box and the rough surface?
What will be an ideal response?
Answer: (a) 1040 N/m (b) 0.41
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A. 35 ft3. B. 41 ft3. C. 47 ft3. D. 53 ft3. E. 59 ft3.
Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 73 hours the star becomes dimmer for about 2 hours
The change in brightness alternates between a small change and a large change. The most likely explanation is that ________. A) the star is a member of an eclipsing binary star system B) the star is periodically ejecting gas into space, every 73 hours C) the star is a Cepheid variable D) the star is a white dwarf
When you pay your electric bill, what are you paying for, exactly?
A. The electrical charge you used the previous month B. The electrical energy you used the previous month C. The voltage you used the previous month D. The electrical power you used the previous month E. None of these choices are correct
Which of the following is true of the Ptolemaic model of the Universe?
A) It predicted the positions of the planets with fair accuracy at first. B) It went against Aristotle's beliefs of the Universe. C) It strengthened the first principles of Aristotle. D) It placed Earth at the exact center of the Universe.