A 16-kg mass is placed on a 25° incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.574 and the coefficient of sliding friction is 0.519 . The mass is given a shove causing it to slide down the incline. Taking down the incline as positive, what is the acceleration of the mass while it is sliding?
a. 0.47 m/s2
b. –0.47 m/s2
c. –0.96 m/s2
d. 0.96 m/s2
e. 14.50 m/s2
b
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Time Dilation: Suppose one twin takes a ride in a spaceship traveling at a very high speed to a distant star and then back again, while the other twin remains on Earth. Compared to the twin who remained on Earth, the astronaut twin is
A. younger than the Earth-twin. B. the same age as the Earth-twin. C. older than the Earth-twin. D. The ages cannot be determined from the information provided.
The masses of stars are generally in the range of 30 to 0.1 solar masses.
Answer the following statement true (T) or false (F)
Two stars have the same absolute magnitude, but one lies twice as far from Earth as the other. It will appear half as bright
Indicate whether the statement is true or false
A 30-N box is pulled upward 6.0 m along the surface of a ramp that rises at 37° above the horizontal. How much work does gravity do on the box during this process?
A) -1100 J B) -110 J C) -140 J D) -180 J E) 120 J