An 0.80-kg block is held in place against the spring by a 67-N horizontal external force (see the figure). The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s upon separation from the spring
The block descends a ramp and has a velocity v2 = 1.9 m/s at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction over this section is 0.39. The velocity of the block is v3 = 1.4 m/s at C. The block moves on to D, where it stops. The spring constant of the spring is closest to
A) 3900 N/m.
B) 2600 N/m.
C) 2000 N/m.
D) 1600 N/m.
E) 1100 N/m.
Answer: A
You might also like to view...
Suppose the Moon's orbit were unchanged, but it rotated faster (meaning it did not have synchronous rotation). Which of the following would be true?
A) The Moon would go through its cycle of phases (from one new Moon to the next) in less time than it does now. B) We would no longer always see nearly the same face of the Moon. C) Tides would be stronger; that is, higher high tides and lower low tides. D) High tides would occur more frequently than they do now. E) All of the above are true.
At the moment of a total eclipse, the moon lies along a line from the Earth to the Sun. If your normal weight is 600 N, how much is your weight decreased by the combined pull of the Sun and Moon? MSun = 2.0 × 1030 kg,rS-E = 1.5 × 108 kmMMoon = 7.4 × 1022 kg,rM-E = 3.8 × 105 km
What will be an ideal response?
The direction of the magnetic field of a bar magnet is
a. in the direction opposite to that in which a compass would point. b. in any direction. c. away from the south pole. d. away from the north pole.
Voids contain about what percentage of the universe's mass?
A) 0 B) 5-10 C) 40-50 D) 100 E) cannot be determined