Suppose you watch a leaf bobbing up and down as ripples pass it by in a pond. You notice that it does two full up and down bobs each second. Which statement is true of the ripples on the pond?
A) They have a wavelength of two cycles per second.
B) They have a frequency of 4 hertz.
C) We can calculate the wavelength of the ripples from their frequency.
D) They have a frequency of 2 hertz.
D
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A feather and a coin will have equal accelerations when falling in a vacuum because
A) their velocities are the same. B) the force of gravity is the same for each in a vacuum. C) the force of gravity does not act in a vacuum. D) the ratio of both the feather's and coin's weight to mass is the same. E) none of the above
A 2-kg rifle is horizontally suspended by a pair of strings so that recoil can be measured. The rifle fires a 0.001-kg bullet at a speed of 200 m/s. The recoil velocity of the rifle is about
A) 0.001 m/s. B) 0.01 m/s. C) 0.1 m/s. D) 1 m/s. E) none of the above
An electron is released from rest at a distance of 9.00 cm from a fixed proton
How fast will the electron be moving when it is 3.00 cm from the proton? (k = 1/4??0 = 8.99 × 109 N ? m2/C2, e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg, mproton = 1.67 × 10-27 kg) A) 75.0 m/s B) 106 m/s C) 130 m/s D) 1.06 × 103 m/s E) 4.64 × 105 m/s
Three satellites are launched into space connected together. Once in deep space, an explosive charge separates the three satellites and they move apart. The satellites each have different masses with m1 < m2 < m3 . Which of the following statements is always true?
a. The one with mass m1 receives the greatest impulse. b. The one with mass m3 receives the greatest impulse. c. The all must receive equal impulses. d. Although one or more of the above statements could be true in special cases, they are not always true.