A 328-kg car moving at 19.1 m/s in the +x direction hits from behind a second car moving at in the same direction
If the second car has a mass of and a speed of right after the collision, what is the velocity of the first car after this sudden collision?
A) 18.2 m/s B) -14.0 m/s C) 24.2 m/s D) 14.0 m/s
D
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Recall Galileo's Leaning Tower experiment. With negligible air resistance, a heavy and a light object fall
A) with equal accelerations. B) with the same increases in speed. C) to the ground in equal times. D) all of the above
Which of the following radiations has the smallest frequency?
a. Infrared b. Visible c. Ultraviolet d. X-rays
A 1.37-kg block is held in place against the spring by a 74-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 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 0.24. The velocity of the block is at C. The block moves on to D, where it stops. The initial compression of the spring is closest to A) 2.7 cm. B) 1.4 cm. C) 0.96 cm. D) 5.3 cm. E) 3.6 cm.
Starburst galaxies are invisible in the infrared range
Indicate whether the statement is true or false