A ball is thrown with a velocity of 40 m/s at an angle of 30° above the horizontal and attains a certain range R. At what other angle will this ball attain the same range keeping its initial velocity the same?
A) 15°
B) 90°
C) 120°
D) 60°
E) All other angles will give different ranges.
D
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A champion athlete can produce one horsepower (746 W) for a short period of time. The number of 16-cm-high steps a 70-kg athlete could ascend in one minute while expending one horsepower is
A. 4. B. 7. C. 65. D. 408. E. 4567.
The farthest point of the Sun from the equator is known as the
a. declination. b. solstice. c. latitude. d. equinox.
A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil and capped at both ends with tight-fitting pistons
The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at the same level. What is the initial force that must be applied to the smaller piston in order to start lifting the car? For purposes of this problem, neglect the weight of the pistons. A) 727 N B) 926 N C) 2900 N D) 3330 N E) 1.20 kN
Dinosaurs were abundant during the
A) Paleozoic era. B) Devonian era. C) Mesozoic era. D) Cenozoic era.