An artificial satellite moves at a steady 25,000 km/hr in a circular orbit around Earth. Is it accelerated?
A) Yes, because its speed is changing.
B) Yes, because its direction of motion is changing.
C) No, because its speed is unchanging.
D) No, because its direction of motion is unchanging.
E) No, for both reasons C and D.
B
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Which horse moves faster in m/s on a merry-go-round?
A) one near inner rail B) one near outer rail C) both move at the same speed in m/s.
What is the approximate surface temperature of a star with moderate hydrogen absorption lines and moderate ionized calcium absorption lines?
A) 4,500 K B) 5,500 K C) 3,500 K D) 6,500 K
An electron in a hydrogen atom makes a transition from the n = 4 to the n = 3 energy state. Determine the energy (in eV) of the emitted photon
a. 0.54 b. 0.66 c. 0.85 d. 1.51 e. 10.2
What is the film temperature?
What will be an ideal response?