The resistance of a wire can be increased by
a. making the wire longer. b. lowering the temperature of the wire.
c. making the wire thinner. d. making the wire shorter.
a, c
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Arvin the Ant travels 30 cm eastward, then 25 cm northward, and finally 10 cm westward. In what direction is Arvin now in with respect to his starting point?
a. 59° N of E b. 29° N of E c. 29° N of W d. 51° N of E
In a Galilean telescope, the eyepiece is a diverging lens, while the objective lens is a converging lens. This means that:
A. The image that the observer looks at is inverted B. The image that the observer looks at subtends a larger angle than the object does C. The image that the observer looks at is virtual D. The image that the observer looks at is real
Radiation pressure: A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. Radiant energy, having an intensity of 300 W/m2, is incident normally upon the vanes. What is the radiation pressure on the blackened vane? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) 
A. 1.0 × 10-10 Pa B. 1.0 × 10-9 Pa C. 1.0 × 10-8 Pa D. 1.0 × 10-7 Pa E. 1.0 × 10-6 Pa
A centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration. A point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed
(a) What is the average angular acceleration of the centrifuge as it spins up? (b) How many revolutions does the centrifuge make as it goes from rest to its final angular speed?