Reverberation time of a room can be increased by covering the walls with better reflectors of sound
a. True
b. False
Indicate whether the statement is true or false
True
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You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 4 cm wide but 7 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.
Three masses are located as follows: a 3.0-kg mass is at the origin, a 4.5-kg mass at (0.0 m, 4.0 m), and a 2.5-kg mass at (3.0 m, 0.0 m). What is the gravitational energy of the system of masses? G = 6.67 x 10-11 N•m2/kg2
A) -3.8 × 10-10 J B) -3.9 × 10-10 J C) -5.4 × 10-10 J D) -3.2 × 10-10 J E) -3.5 × 10-10 J
A resting blood pressure of 140 over 90 or more is considered hypertension.
Answer the following statement(s) true (T) or false (F)
Work-Energy Theorem: A driver, traveling at 22 m/s, slows down her 2000 kg truck to stop for a red light. What work is done on the truck by the friction force of the road?
A. -2.2 × 104 J B. -4.4 × 104 J C. -4.8 × 105 J D. -9.7 × 105 J