A piano wire of linear mass density 0.0050 kg/m is under a tension of 1350 N. What is the wave speed in this wire?
A) 130 m/s
B) 260 m/s
C) 520 m/s
D) 1040 m/s
C
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A charged particle is placed at rest in the middle of a vacuum chamber, an enclosure that has been emptied of all matter. Consider some point X near a particular corner of the chamber
Neglecting all influences other than the charged particle, what can be said regarding electric fields and electric forces at point X? A) The is an electric field at X, but no electric force. B) There is both an electric field and an electric force at X. C) There is neither an electric field nor an electric force at X. D) There is no electric field at X but there is an electric force at X. E) It is impossible to answer this question without knowing what kind of charge the particle has.
Pressure: Calculate the pressure exerted on the ground due to the weight of a 79-kg person standing on one foot. if the bottom of the person's foot is 13 cm wide and 28 cm long.
A. 2.1 × 104 Pa B. 2.2 × 103 Pa C. 4.8 × 104 Pa D. 5.3 × 104 Pa
A 16 solar mass main sequence star is at a smaller distance than a 1solar mass mainsequence star. Which star appears brighter?
a) cannot tell with the information given b) stars are approximately the same brightness c) the 16 solar mass main sequence star d) depends on the phase of the Moon e) the 1 solar mass main sequence star
Work: You throw a baseball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down.
A. The work is positive on the way up and positive on the way down. B. The work is positive on the way up and negative on the way down. C. The work is negative on the way up and positive on the way down. D. The work is negative on the way up and on the way down because gravity is always downward.