The radiation source closest to us originates in
A) medical treatments.
B) all kinds of power plants.
C) our own bodies.
D) none of the above
Answer: C
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A rectangular coil having N turns and measuring 15 cm by 25 cm is rotating in a uniform 1.6-T magnetic field with a frequency of 75 Hz. The rotation axis is perpendicular to the direction of the field
If the coil develops a sinusoidal emf of maximum value 56.9 V, what is the value of N? A) 2 B) 4 C) 8 D) 10 E) 6
A bar (L = 80 cm) moves on two frictionless rails, as shown, in a region where the magnetic field is uniform (B = 0.30 T) and into the paper. If v = 50 cm/s and R = 60 m?, what is the magnetic force on the moving bar?
a.
0.48 N to the right
b.
0.48 N to the left
c.
0.32 N to the left
d.
0.32 N to the right
e.
None of the above
What is the mass of a ball moving at 3 m/s with a momentum of 48 kg?m/s?
A) 4 kg B) 12 kg C) 16 kg D) 144 kg E) none of these
A gray opaque surface has an emissivity of 0.8 at 400ºF. Determine the radiosity if it is irradiated at 1000 Btu/hr?ft^2.
What will be an ideal response?