The mass of a neutron is ________ the combined mass of a proton and an electron
A) less than
B) equal to
C) more than
C
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Reactance: A 0.200-H inductor is connected to a 60.0-Hz 120-V rms source.(a) What is the inductive reactance?(b) What is the rms current to the inductor?(c) If both the inductance and the frequency were doubled, what would be the rms current?
What will be an ideal response?
Star A has a temperature 3 times that of star B. Both star A and star B are the same physical size. Which statement about star A and star B below is correct?
A) Star A is redder and dimmer than star B. B) Star A is bluer and dimmer than star B. C) Star A is redder and brighter than star B. D) Star A is bluer and brighter than star B. E) Star A and star B have the same color, but star A is brighter.
A ball rolls off a shelf and hits the floor below 0.25 second later. To find the speed of the ball as it left the shelf, we would need
A. to repeat the experiment. B. the distance measured along the floor to the point of impact. C. the weight of the ball. D. the height of the table.
A coil is placed in a magnetic field and has a flux ?B through it. The coil is stressed so that its area reduces to 75% of its original value. If the plane of the coil stays the same and the flux through it remains the same, how must the magnetic field change?
a. It must increase by 25%. b. It must increase by 33%. c. It must increase by 125%. d. It must decrease by 25%.