A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the collision with the wall?
A) 200 m/s2 B) 1300 m/s2 C) 1500 m/s2 D) 2800 m/s2 E) 0 m/s2
D
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As a result of friction between internal parts of an isolated system
a. the total mechanical energy of the system increases. b. the total mechanical energy of the system decreases. c. the total mechanical energy of the system remains the same. d. the potential energy of the system increases but the kinetic energy remains the same. e. the kinetic energy of the system increases but the potential energy of the system remains the same.
A Boeing 737 airliner has a mass of 20 000 kg and the total area of both wings (top or bottom) is 100 m2 . What is the pressure difference between the top and bottom surface of each wing when the airplane is in flight at a constant altitude?
a. 1 960 N/m2 b. 3 920 N/m2 c. 7 840 N/m2 d. 4 560 N/m2 e. 3 070 N/m2
What is the first known human-made material?
(a) Ceramic (b) Bronze (c) Flint arrowheads (d) Copper
An airplane flies in a semi-circular arc in order to simulate “weightlessness” for its occupants. If the radius of the semicircular path it flies is 3500 m, what is the speed at which the plane flies?
A. 357 m/s B. 580 m/s C. 185 m/s D. 1180 m/s