A boat with mass 950 kg is heading into the harbor at a speed of 10.0 m/s. How much work is required to slow the boat to 1.0 m/s?
a. 4.8E+4 J
b. 9.4E+4 J
c. 4.7E+4 J
d. 2.3E+4 J
d
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A drinking glass has a diameter of 2.5 inches and is 5.5 inches tall. What is the volume of the drinking glass in cubic centimeters?
A) 170 cubic cm B) 440 cubic cm C) 350 cubic cm D) 710 cubic cm E) 530 cubic cm
A projectile that is fired vertically at 5 km/s from the Earth's surface will
A) go into a circular orbit about Earth. B) go into an elliptical orbit about Earth. C) rise and fall back to Earth's surface. D) none of the above
This is a "thought" question. Why are few galaxies outside our own galaxy seen by our eyes in the circle around the sky where the Milky Way is located? This is because
a. there aren't any galaxies in those directions. b. dust in the Milky Way blots out our view of galaxies in those directions. c. the missing mass is in those directions. d. a massive explosion has blown galaxies away from those directions.
A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m. If the coefficient of kinetic friction between the sled and the surface is 0.20, what was the initial speed of the sled?
A) 9.8 m/s B) 6.3 m/s C) 3.6 m/s D) 7.2 m/s E) 8.9 m/s