The Pioneer probes carry what kind of physical time capsule?
A) a small engraved plaque
B) a gold-plated record containing pictures, multilingual greetings and music
C) a DVD containing pictures
D) these probes do not carry a physical time capsule
A
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Photons of red light cause a surface to emit photoelectrons with maximum kinetic energy K(red). If photons of blue light of the same intensity are now used in the experiment, which of the following statements is true about the photoelectrons emitted (if any are emitted)?
A. no photoelectrons are emitted B. maximum K(blue) < K(red) C. maximum K(blue) = K(red) D. maximum K(blue) > K(red) E. none of these choices are true
Which of the following is not an appropriate use of OUHMWPE?
(a) Milk bottles (b) Parachute lines (c) Bow string (d) Tug tow rope
What color are most of the stars closest to the Sun?
What will be an ideal response?
You are designing an ac generator with a maximum emf of 8.0 V. If the generator coil has 200 turns, each with a cross-sectional area of 0.030 m2,
what should be the frequency of the generator in a magnetic field of 0.030 T? A) 7.5 Hz B) 7.1 Hz C) 44 Hz D) 8.0 Hz