The ecliptic plane is
A) the plane of Earth's orbit around the Sun.
B) the plane of the Moon's orbit around Earth.
C) the plane of our solar system's orbit around the Milky Way Galaxy.
D) a flat disk of material that lies between the Sun and Earth.
E) the plane defined by Earth's equator.
B) the plane of the Moon's orbit around Earth.
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A transformer with 600 turns on the primary coil is used to decrease the voltage from 3000 V to 120 V for home use. How many turns should be in the secondary coil?
a. 600 turns b. 15000 turns c. 24 turns d. 3720 turns
A basketball bounces off the floor. It is difficult to apply conservation of momentum usefully to the ball–earth system in this case because
A. The system is not isolated. B. A basketball does not bounce perfectly elastically. C. Air friction is significant. D. We can’t easily measure the earth’s velocity. E. The law doesn’t apply to contact interactions.
A parallel-plate capacitor has plates of area 0.80 m2 separated by a distance of 3.0 mm. What is this capacitor's capacitance?
A) 270 F B) 70 F C) 2.4 × 10-9 F D) 4.8 × 10-10 F E) 3.6 × 10-10 F
To excite the second harmonic in a jumprope, you have to change the frequency from the fundamental. The new frequency must be
A. the same as the fundamental frequency, but you'll need a larger wavelength. B. smaller. C. larger. D. the inverse of the fundamental frequency.