By adjusting a TV image with a remote you can
A) affect only the image.
B) participate with the action on the screen.
C) both of these
D) neither of these
Answer: A
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Waves on a String: Transverse waves travel at 43.2 m/s in a string that is subjected to a tension of 60.5 N. If the string is 15.9 m long, what is its mass?
A. 0.515 kg B. 0.216 kg C. 0.366 kg D. 0.597 kg
Why must telescopes observing at long infrared (that is, far-infrared) wavelengths be cooled to low temperatures?
What will be an ideal response?
An electron is released from rest at the negative plate of a parallel-plate capacitor. If the distance across the plates is 5.0 mm and the potential difference across the plates is 20 V, with what velocity does the electron hit the positive plate? (me = 9.1 × 10^-31 kg, e = 1.6 × 10^-19 C)
a. 1.3 × 10^6 m/s c. 2.7 × 10^6 m/s b. 1.0 × 10^6 m/s d. 5.3 × 10^6 m/s
Of all his laws, Kepler was proudest of the third. Why was it so appealing in his search for cosmic harmony?
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