The magnifying power of a telescope with a primary lens of focal length 1 m and an eye piece of 0.5 m focal length is _____
A) 2
B) 5
C) 8
D) 10
A
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Assume when using a meter stick measuring can be done so that the last significant figure is in the tenth of a millimeter digit. If you are measuring an object with length between 25 and 53 cm, how many significant figures will result if you only use the part of the meter stick between the 3-cm and 85-cm positions?
a. 1 b. 2 c. 3 d. 4 e. more than 4
Which best describes the relationship between two systems in thermal equilibrium?
a. No net energy is exchanged. c. Masses are equal. b. Volumes are equal. d. The velocity is zero.
A 1-kg rock is suspended from the tip of a horizontal meterstick at the 0-cm mark so that the meterstick barely balances like a seesaw when its fulcrum is at the 25-cm mark. From this information, the mass of the meterstick is
A) 1/4 kg. B) 1/2 kg. C) 3/4 kg. D) 1 kg. E) none of the above
A child's toy is suspended from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8 N. If this is the "action force," what is the "reaction force"?
A) the string pulling downward on the ceiling with an 8-N force B) the ceiling pulling upward on the string with an 8-N force C) the string pulling upward on the toy with an 8-N force D) the toy pulling upward on the Earth with an 8-N force E) the toy pushing downward on the Earth with an 8-N force