A 90.% efficient transformer supplies 3.0 Amperes at 6.0 volts. If the input voltage is 120. v, what is the input current?
What will be an ideal response?
0.17 A
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A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
A. 8.2 m B. 15.8 m C. 13.5 m D. 11.0 m E. 4.9 m
A satellite is in a circular orbit about the Earth at an altitude at which air resistance is negligible. Which of the following statements is true?
a. There is only one force acting on the satellite. b. There are two forces acting on the satellite, and their resultant is zero. c. There are two forces acting on the satellite, and their resultant is not zero. d. There are three forces acting on the satellite. e. None of the preceding statements are correct.
For a nova to occur, the system must have already been a
A) astrometric binary. B) detached binary. C) spectroscopic binary. D) mass-transfer binary. E) eclipsing binary.
A very small object carrying -6.0 ?C of charge is attracted to a large, well-anchored, positively charged object. How much kinetic energy does the negatively charged object gain
if the potential difference through which it moves is 3.0 mV? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) 0.50 kJ B) 18 nJ C) 6.0 ?J D) 0.50 J