A hollow cylinder with an inner radius of 4.0 mm and an outer radius of 30 mm conducts a 3.0-A current flowing parallel to the axis of the cylinder. If the current density is uniform throughout the wire,
what is the magnitude of the magnetic field at a point 12 mm from its center? (?0 = 4? × 10-7 T ? m/A)
A) 7.2 × 10-6 T
B) 8.0 × 10-6 T
C) 8.9 × 10-7 T
D) 7.1 × 10-8 T
A
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A 6.0 kg box slides down an inclined plane that makes an angle of 39° with the horizontal. If the coefficient of kinetic friction is 0.19, at what rate does the box accelerate down the slope?
A) 4.7 m/s2 B) 5.2 m/s2 C) 5.5 m/s2 D) 6.2 m/s2
Saturn is noticeably oblate because:
A) it has strong magnetic fields that deform its shape. B) its powerful gravity acts stronger on the closer poles than the distant equator. C) it is a fluid body that is spinning rapidly. D) it is tidally distorted by the pulls for its satellite system. E) All of the above are correct.
During each cycle, a heat engine takes in 4.0 J of heat, does 1.0 J of work, and expels 3.0 J of heat. What is its efficiency?
What will be an ideal response?
Discuss why Pluto is no longer considered a planet
What will be an ideal response?