A changing current in one loop of wire can induce a current in another loop of wire even though the wires do not touch. The induced current appears almost instantaneously for loops close together. How can this energy exchange happen?
a. This is one of those things for which science has no adequate explanation yet.
b. The second loop is affected by the thermal exchange from the heating of the first loop.
c. It is a gravitational effect on the electrons.
d. It is done via an electromagnetic wave.
d
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Rotational Dynamics: The drum shown in the figure has a radius of 0.40 m and a moment of inertia of 2.3 kg ? m2 about an axis perpendicular to it through its center. The frictional torque at the drum axle is 3.0 N ? m. A 14-m length of rope is wound around the rim. The drum is initially at rest. A constant force is applied to the free end of the rope until the rope is completely unwound and slips off. At that instant, the angular speed of the drum is 23 rad/s. The drum then slows down at a constant rate and comes to a halt. In this situation, what was the magnitude of the constant force applied to the rope?
A. 51 N B. 40 N C. 29 N D. 18 N E. 7.5 N
This graph shows how the apparent brightness of an eclipsing binary system changes with time. Which of the four labeled regions represents the system at a time when one star is eclipsing the other?
A) I B) II C) III D) IV E) both II and IV F) both I and II
An astronaut has landed on an asteroid and conducts an experiment to determine the acceleration of gravity on that asteroid
He uses a simple pendulum that has a period of oscillation of 2.00 s on Earth and finds that on the asteroid the period is 11.3 s. What is the acceleration of gravity on that asteroid? A) 0.307 m/s2 B) 1.66 m/s2 C) 1.74 m/s2 D) 5.51 m/s2 E) 0.0544 m/s2
Why would something like eating raw oysters be potentially harmful?
What will be an ideal response?