A long straight wire (diameter = 2.0 mm) carries a current of 30 A. What is the magnitude of the magnetic field 2.5 mm from the axis of the wire?
a. 3.2 mT
b. 2.8 mT
c. 2.4 mT
d. 3.6 mT
e. 3.0 mT
c
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A tractor T is pulling a trailer M with a constant velocity. If the velocity is 20 m/s and M = 200 kg and T = 500 kg, then the force on the trailer due to the tractor is
A. 600 N forward.
B. 450 N backward.
C. 200 N backward.
D. 35 N forward.
E. 0.
A steel guitar string with a diameter of 0.300 mm and a length of 70.0 cm is stretched by 0.500 mm while being tuned. How much force is needed to stretch the string by this amount? Young's modulus for steel is 2.0 × 1011 N/m2
What will be an ideal response?
The latent heat of vaporization of water is roughly 10 times the latent heat of fusion of water. The amount of heat required to boil away 1 kg of water is 10 times the amount of heat required to melt 1 kg of ice
Indicate whether the statement is true or false
Why are white dwarf supernovae more useful than massive star supernovae for measuring cosmic distances?
A) White dwarf supernovae all have roughly the same true peak luminosity, while massive supernovae come in a wide range of peak luminosities. B) We can see only white dwarf supernovae in distant galaxies, not massive star supernovae. C) White dwarf supernovae are much more common than massive star supernovae. D) White dwarf supernovae obey Leavitt's law, while massive supernovae do not.