At what frequency should a 200-turn, flat coil of cross sectional area of 300 cm2 be rotated in a uniform 30-mT magnetic field to have a maximum value of the induced emf equal to 8.0 V?

a. 7.5 Hz
b. 7.1 Hz
c. 8.0 Hz
d. 8.4 Hz
e. 16 Hz


b

Physics & Space Science

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Fill in the blank(s) with correct word

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Explain individual galaxies or clusters of galaxies do not expand in size despite the overall expansion of the universe implied by Hubble's Law

What will be an ideal response?

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A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?

a. ?14 J b. ?12 J c. ?10 J d. ?16 J e. ?25 J

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a. True b. False Indicate whether the statement is true or false

Physics & Space Science