A step-up transformer steps up voltage by ten times. Neglecting slight losses, if 100 W of power go into the primary coil, the power coming from the secondary coil is
A) 1 W.
B) 10 W.
C) 100 W.
D) 1000 W.
E) none of the above
Answer: C
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A charge of +2 C is at the origin. When charge Q is placed at 2 m along the positive x axis, the electric field at 2 m along the negative x axis becomes zero. What is the value of Q?
a.
?3 C
b.
?6 C
c.
?7 C
d.
?8 C
Energy and Mass: If a particle has a total energy that is 5.00 times its rest energy, the speed of the particle is closest to which one of the following values?
A. 0.980c B. 0.985c C. 0.950c D. 0.990c E. 0.998c
Buoyant force acts upward on a submerged object because
A) it acts in a direction to oppose gravity. B) if it acted downward, nothing would float. C) the weight of fluid displaced reacts with an upward force. D) pressure against its bottom is greater than pressure against its top.
Globular clusters can be used to measure the distance of nearby galaxies
a. True b. False Indicate whether the statement is true or false