To send a beam laser-light beam to a space station just above the atmosphere near the horizon, aim your laser
A) above your line of sight.
B) below your line of sight.
C) along your line of sight.
Answer: C
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What centripetal acceleration is required to follow a circular path with a radius of 50 m at a speed of 20 m/s?
a. 6 m/s² b. 2 m/s² c. 8 m/s² d. 4 m/s²
A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg, and a 40.0-kg child sits on the other end. The beam balances when a fulcrum is placed below the beam a distance 1.10 m from the 30.0-kg child. How long is the beam?
A) 2.12 m B) 1.98 m C) 1.93 m D) 2.07 m E) 2.20 m
A small 4.0-µC charge and a small 1.5-µC charge are initially very far apart
How much work does it take to bring them to a final configuration in which the 4.0-µC charge is at the point x = 1.0 mm, y = 1.0 mm, and the 1.5-µC charge is at the point x = 1.0 mm, y = 3.0 mm? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 ) A) 27 J B) 13.5 kJ C) 54 J D) 13.5 J
For the wing of Problem 4-17, if the heat loss is expected to be 400W/m^2 on each side of the wing estimate the temperature distribution along the wing.
What will be an ideal response?