F Oscillations and Gravitation (7.5-7.6 and 13.1-13.2) Quiz

10 points each (300 points total)

 

70.  The escape speed from the moon is what fraction of Earth's escape velocity?

(Earth/Lunar mass ratio = 81.3; Earth/Lunar radius ratio = 3.67)

    a. 0.17

    b. 0.21

    c. 0.41

    d. 0.045

 

71.  The escape velocity is how many times the orbital velocity?

    a.   

    b.    2

    c.   

    d.    4

 

72.  Who was the first person to realize that the planets move in elliptical paths around the sun?

    a. Kepler

    b. Brahe

    c. Einstein

    d. Copernicus

 

73.  A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars.  The acceleration of gravity at the satellite, as compared to the acceleration of gravity on the surface of Mars, is

    a. zero.

    b. the same.

    c. one-third as much.

    d. one-ninth as much.

    e. one-sixteenth as much.

 

74.  What is the escape velocity from the solar system (SUN) leaving from our position 93. million miles from the sun?

      a.  4 x 102 m/s    b.  4 x 103 m/s    c.  4 x 104 m/s   d.  4 x 105 m/s

 

 

75.  Your starship, the TOP-QUARK, is in a counter-clockwise "parking orbit" around the planet VULCAN, as shown, in order to achieve escape velocity, the direction your retro-rockets should be facing is

    a. graph A

    b. graph B

    c. graph C

    d. graph D

 

76.  A spaceship is traveling to the moon.  At what point is it beyond the pull of earth's gravity?

    a. When it gets above the atmosphere

    b. When it is half-way there

    c. When it is closer to the moon than it is to earth

    d. It is never beyond the pull of earth's gravity.

 

77.  Satellite A has twice the mass of satellite T, and rotates in the same orbit.

    a. The speed of T is twice the speed of A.

    b. The speed of T is half the speed of A.

    c. The speed of T is one-fourth the speed of A.

    d. The speed of T is equal to the speed of A.

78.  Two asteroids, of the same mass, have a gravitational potential energy U.  If a third asteroid, of the same mass, moves toward them, to a position such that the distances between the three asteroids are the same, the gravitational potential energy of the system will have changed by

    a. U

    b. 2U

    c. 3U

    d. 4U

 

79. Consider a small satellite moving in a circular orbit (radius r) about a spherical planet (mass M).  The period does not depend upon

    a. the planet mass

    b. the radius r

    c. the satellite mass

    d. g at the satellite position

 

80. A spherically symmetric planet has four times the earth's mass and twice its radius.  If a jar of peanut butter weighs 12 N on the surface of the earth, how much would it weigh on the surface of this planet?

    a. 6 N

    b. 12 N

    c. 24 N

    d. None of the above

 

81. An astronaut goes out for a "space-walk" at a distance above the earth equal to the radius of the earth.  Her acceleration will be

    a. zero

    b. g

    c. 1/2 g

    d. 1/4 g

 

82. The constant K in Kepler's Third Law is the same for all the planets in our solar system, but is different for planetary systems orbiting other stars.

    a. True

    b. False

 

83. Kepler's 3rd law says T2/r3 = K.  What does the constant K depend upon?

    a. period

    b. size

    c. mass

    d. temperature

84. The speed of Halley's comet, while traveling in its elliptical orbit around the sun,

    a. is constant.

    b. increases as it nears the sun.

    c. decreases as it nears the sun.

    d. is zero at two points in the orbit.

 

85. The following statements refer to man-made, artificial satellites in orbit around earth.  Which is an accurate statement?

    a. It is possible to have a satellite traveling at either a high speed or at a low speed in a given circular orbit.

    b. Only circular orbits are possible for artificial satellites.

    c. A satellite in a large diameter circular orbit will always have a longer period of revolution about the earth than will a satellite in a smaller circular orbit.

    d. The velocity required to keep a satellite in a given orbit depends on the mass of the satellite.

    e. The period of revolution of a satellite moving about the earth is independent of the size of the orbit it travels.

 

86. The height of the tides is influenced by:

    a. the moon

    b. the sun

    c. the uneven surface of the Earth

    d. all of the above

    e. none of the above

 

 

The following question(s) refers to the wave shown below.

 

87. The amplitude is

    a. 2 m.

    b. 4 m.

    c. 8 m.

    d. cannot be determined from given information.

 

 

88. The frequency is

    a. 0.5 Hz.

    b. 1 Hz.

    c. 2 Hz.

    d. 4 Hz.

    e. cannot be determined from the given information.

 

89. A pendulum makes 12 complete swings in 8 s.  (a) What is its frequency?  (b) What is its period?

     a.  1.5 Hz, 0.67 sec   b.  0.67 sec,  1.5 Hz    c.  3.5 Hz,  0.286 sec 

     d.  0.286 sec,  3.5 Hz

 

90. What happens to a simple pendulum's frequency if both its length and mass are increased?

    a. It increases.

    b. It decreases.

    c. It remains constant.

    d. It could remain constant, increase, or decrease; it depends on the mass to length ratio (mass density)

 

91. If you take a given pendulum to the moon, where the acceleration of gravity is less than on earth, the resonant frequency of the pendulum will

    a. increase.

    b. decrease.

    c. not change.

    d. either increase or decrease; it depends on its length to mass ratio.

 

92. A mass is attached to a vertical spring and bobs up and down between points A and B.  Where is the mass located when its kinetic energy is a maximum?

    a. At either A or B

    b. Midway between A or B

    c. One-fourth of the way between A and B

    d. None of the above

 

 

93. A mass on the end of a massless spring undergoes SHM.  Where is the instantaneous acceleration of the mass greatest?

    a. A and C

    b. B

    c. C

    d. A and D

 

94. A simple pendulum consists of a mass M attached to a weightless string of length L.  For this system, when undergoing small oscillations

    a. the frequency is proportional to the amplitude.

    b. the period is proportional to the amplitude.

    c. the frequency is independent of the mass M.

    d. the frequency is independent of the length L.

 

 

95. The equation of motion of the wave shown is

    a. y = 1.0 sin (pt)

    b. y = 0.5 sin (40t)

    c. y = 0.5 cos (pt)

    d. y = 0.5 cos (40t)

    e. none of the above.

96. Increasing the mass m of a mass-and-spring system causes what kind of change on the resonant frequency of the system?

    a. The frequency increases.

    b. The frequency decreases.

    c. There is no change in the frequency.

    d. The frequency increases if the ratio k/m is greater than or equal to 1 and decreases if the ratio k/m is less than 1.

 

97. Increasing the spring constant k of a mass-and-spring system causes what kind of change in the resonant frequency of the system?  (Assume no change in the system's mass m.)

    a. The frequency increases.

    b. The frequency decreases.

    c. There is no change in the frequency.

    d. The frequency increases if the ratio k/m is greater than or equal to 1 and decreases if the ratio k/m is less than 1.

 

98.

 

99. Simple pendulum A swings back and forth at twice the frequency of simple pendulum B.  Which statement is correct?

    a. Pendulum B is twice as long as A.

    b. Pendulum B is twice as massive as A.

    c. The length of B is 1.41 times the length of A.

    d. The mass of B is 1.41 times the mass of A.