A 50.0-kg block is being pushed up a 15.0° slope by a force of 300 N which is directed 30.0° below the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the acceleration of the block?
A) 0.164 m/s2
B) 0.967 m/s2
C) 1.20 m/s2
D) 2.20 m/s2
E) 0.528 m/s2
A
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Free Fall: A ball is projected upward at time t = 0 s, from a point on a flat roof 90 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground. The initial velocity of the ball is 80.5 m/s. Consider all quantities as positive in the upward direction. The vertical velocity of the ball when it is 89 m above the ground is closest to
A. -81 m/s. B. -64 m/s. C. -48 m/s. D. -32 m/s. E. -97 m/s.
Hubble's law can be applied to measure the distance of the constellation of Orion.
Answer the following statement true (T) or false (F)
Ice crystals in nearly frozen liquid water make up a
A) microscopic slush. B) region of lower density. C) both of these D) neither of these
A 30-mF capacitor is charged to 80 V and then connected across an initially uncharged capacitor of unknown capacitance C. If the final potential difference across the 30-mF capacitor is 20 V, determine C
a. 60 mF b. 75 mF c. 45 mF d. 90 mF e. 24 mF