A brass wire (d 5 2.0 mm, E 5 110 GPa) is pretensioned to T 5 85 N. The coefficient of thermal expansion for the wire is 19.5 3 1026/°C. The temperature change at which the wire goes slack is approximately:
(A) 15.7 °C
(B) 212.6 °C
(C) 112.6 °C
(D) 218.2 °C
(C) 112.6 °C
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Based on the H-R diagram shown above, what is the spectral type of a main-sequence star with a luminosity 100 times greater than that of the Sun?
A) O B) A C) G D) M
One number has three significant figures and another number has four significant figures. If these numbers are added, subtracted, multiplied, or divided, which operation can produce the greatest number of significant figures?
a. the addition b. the subtraction c. the multiplication d. the division e. All the operations result in the same number of significant figures.
A double-convex lens is formed from a piece of plastic with an index of refraction of 1.70. The radius of the front surface has magnitude 20 cm, and the radius of the back surface has magnitude 30 cm. What is the focal length of this lens?
A) 86 cm B) -86 cm C) 43 cm D) -17 cm E) 17 cm
The rotating systems shown in the figure differ only in that the two identical movable masses are positioned a distance r from the axis of rotation (left), or a distance r/2 from the axis of rotation (right)
You release the hanging blocks simultaneously from rest, and call tL the time taken by the block on the left and tR the time taken by the block on the right to reach the bottom, respectively. The bar, pulley, and rope have negligible mass, the rope does not slip, and there is no friction in the axle of the pulley. Under these conditions A) tL = tR. B) tL = tR. C) tL = tR. D) tL = 2tR. E) tl = 4tR.