What is the primary cause of Earth's seasons?
What will be an ideal response?
Earth's rotation axis is tilted with respect to the plane of its orbit around the sun
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The surface of Venus has been studied
a. using radar maps made from Earth. b. using radar maps made from satellites orbiting Venus. c. using spacecraft that have landed on the surface of Venus. d. all of the above e. only b and c
Beats: Two taut strings of identical mass and length are stretched with their ends fixed, but the tension in one string is 1.10 times greater than in the other. Waves on the string with the lower tension propagate at 35.2 m/s. The fundamental frequency of that string is 258 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency?
A. 11.0 Hz B. 9.00 Hz C. 13.7 Hz D. 12.6 Hz E. 17.1 Hz
The circuit below contains three 100-W light bulbs and a capacitor. The emf ? = 110V. At the instant the switch S is closed, which light bulb is brightest?
A. A B. B C. C D. A and B E. All three are equally bright.
A long solenoid (1 000 turns/m) carries a current of 25 mA and has an inside radius of 2.0 cm. A long wire which is parallel to and 4.0 cm from the axis of the solenoid carries a current of 6.0 A. What is the magnitude of the magnetic field at a point on the axis of the solenoid?
a. 51 mT b. 61 mT c. 43 mT d. 81 mT e. 1.4 mT