A rectangular wire loop (length = 60 cm, width = 40 cm) lies completely within a perpendicular and uniform magnetic field of magnitude of 0.5 T. If the length of the loop starts increasing at a rate of 20 mm/s at time t = 0, while the width is decreasing at the same rate, what is the magnitude of the induced emf at time t = 4.0 s?
a. 6.8 mV
b. 5.2 mV
c. 3.6 mV
d. 8.4 mV
e. 10 mV
c
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A block of mass m is on a rough surface, with a spring attached and extended. As the block moves up the incline a small distance, how many forces are exerted on the mass? the switch is closed?
Consider the field lines of the electric dipole in this diagram, relative to the w-axis and the z-axis. 
In which direction does the electric field point where the two axes intersect?
A. 45° up and to the right, parallel to the z-axis: 
B. 45° down and to the left, parallel to the z-axis: 
C. 45° down and to the right, parallel to the w-axis: 
D. 45° up and to the left, parallel to the w-axis: 
Simple Harmonic Motion: A sewing machine needle moves in simple harmonic motion with a frequency of 2.5 Hz and an amplitude of 1.27 cm.(a) How long does it take the tip of the needle to move from the highest point to the lowest point in its travel?(b) How long does it take the needle tip to travel a total distance of 11.43 cm?
What will be an ideal response?
It is bright everywhere. You have been able to travel around, and it's clear that you are not inside a star. Yet your surroundings seem as bright as looking directly at the Sun
As you travel around, you notice that you cannot find a single neutral atom anywhere, nor can you find any nucleus besides those of hydrogen and helium. While it is hot (a few thousand degrees Kelvin), it is nowhere near the temperature needed for nuclear fusion. Where are you? A) You are in the planetary nebula that the Sun will form about 5 billion years from now. B) You are in an accretion disk around a supermassive black hole. C) You are in the universe more than 10100 years in the future. D) You are in the universe during its first 380,000 years. E) You are in the central regions of a quasar.