Imagine you serve a tennis ball with an initial speed of 10 m/s in a direction 10° below the horizontal. What is its speed at the peak of its trajectory?
A. 10 m/s
B. 9.8 m/s
C. 1.7 m/s
D. 0 m/s
E. There is no “peak” to this tennis ball’s trajectory.
F. Other (specify)
E. There is no “peak” to this tennis ball’s trajectory.
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If the efficiency of a reversible engine is 28%, what is its COP (performance coefficient) operated (a) as a refrigerator, and (b) as a thermodynamic pump?
What will be an ideal response?
Light is incident on a double-slit. The fourth bright band has an angular distance of 7.0° from the central maximum. What is the distance between the slits (in ?m)? (Assume the frequency of the light is 5.4 × 1014 Hz.)
A. 27 B. 21 C. 24 D. 18 E. 14
Which statement correctly describes units that can be used to measure energy and power?
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The right image was obtained when only part of Io was in sunlight. Based on the colors, which part of the surface was in sunlight?
A) the left side B) the right side C) only the peaks of the volcanoes