One side of the Moon continually facing Earth is

A) a passing phenomenon.
B) a cosmic coincidence.
C) tidal lock.


Answer: C

Physics & Space Science

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A 1.1kg seagull takes off from a piling along the California coast and accelerates within 0.50s to a flight speed of 7.5m/s along a horizontal path. What average power was developed by the bird’s wings as it accelerated?

A. 62W B. 8.3W C. 33W D. 250W

Physics & Space Science

A 4.00-kg block rests on a 30.0° incline as shown in the figure. If the coefficient of static friction between the block and the incline is 0.700, what magnitude horizontal force F must act on the block to start it moving up the incline?

A) 34.0 N B) 51.1 N C) 54.7 N D) 84.0 N E) 76.4 N

Physics & Space Science

An electron is held up against the force of gravity by the attraction of a fixed proton some distance above it. How far above the electron is the proton?

A) 1.5 m B) 2.3 m C) 3.7 m D) 4.6 m E) 5.1 m

Physics & Space Science

Evaluate the success of demand side management techniques in decreasing the demand for power plants. Could the method have worked better?

What will be an ideal response?

Physics & Space Science