A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 ? is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (?t), where A = 80 ?T and ? = 50? rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?
a. 11 mA
b. 18 mA
c. 14 mA
d. 22 mA
e. zero
a
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What is the primary way in which high-mass stars recycle material into the interstellar medium?
A) through stellar winds and supernova explosions B) through the formation of planetary nebulae C) through protostar formation D) through stellar winds alone
The pressure relief valve is opened on a thin-walled cylindrical tank, with the radius-to-wall thickness ratio of 128, thereby decreasing the lon-gitudinal strain by 150 3 1026. Assume E 5 73 GPa and ? 5 0.33. The original internal pressure in the tank was approximately:
(A) 370 kPa
(B) 450 kPa
(C) 500 kPa
(D) 590 kPa
You are on the surface of an object, and you have a fairly clear view out into space. It might be very nice, except for one major drawback: You are very squashed
Also, light you observe from distant objects is apparently slightly blueshifted (compared to what it normally looks like). The surface of the object is composed primarily of carbon and oxygen, and the horizon distance is about the same as that on Earth. By observing the stellar background for a few weeks, you realize that there are several planets orbiting your object. Where are you? A) You are on the surface of Earth. B) You are on the surface of a planet that is somewhat more massive than Earth. C) You are on the surface of a white dwarf. D) You are "on" an accretion disk around a black hole. E) You are on the surface of a neutron star.
When you are standing by an air conditioning vent in an indoor swimming pool area, you feel a lot cooler if you are wet than if you are dry. Why?
What will be an ideal response?