A 50.0-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 20.7° below the horizontal is applied to the box. The coefficient of kinetic friction between the box and the surface is 0.300
What is the acceleration of the box? A) 1.21 m/s2
B) 1.77 m/s2
C) 2.84 m/s2
D) 3.54 m/s2
E) 5.14 m/s2
A
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The magnitudes of two horizontal displacements are 4 m and 9 m, respectively. Given that the vectors may be in either the plus or the minus direction, they cannot be added together to give a total displacement of
a. –13 m. b. –5 m. c. 5 m. d. 13 m. e. 4 m.
The position of a mass that is oscillating on a spring is given by x = (18.3 cm) cos[(2.35 s-1)t]. What is the frequency of this motion?
A) 0.426 Hz B) 1.34 Hz C) 2.67 Hz D) 0.128 Hz E) 0.374 Hz
During Spring Tides the high tides are higher
Answer the following statement(s) true (T) or false (F)
The Drake equation calculates N. What is N?
A) the number of intelligences in the entire universe B) the number of technical civilizations in our galaxy presently C) the number of stars with habitable planets D) the number of planets with life in the universe E) the number of planets in just our galaxy