A circular coil of radius 5.0 cm and resistance 0.20 ? is placed in a uniform magnetic field perpendicular to the plane of the coil. The magnitude of the field changes with time according to B = 0.50e-20t T
What is the magnitude of the current induced in the coil at the time t = 2.0 s?
A) 4.2 mA B) 2.6 mA C) 7.5 mA D) 1.3 mA E) 9.2 mA
B
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Which of the following statements is true of the third reaction in the proton-proton chain?
A) It yields a helium atom. B) It emits a neutrino. C) It emits a gamma ray. D) It yields carbon dioxide.
What is happening deep inside a star while it expands into a subgiant?
A) It is fusing hydrogen to produce helium in the core. B) It is fusing hydrogen to produce helium in a shell around the core. C) It is fusing helium to produce carbon in the core. D) It is fusing helium to produce carbon in a shell around the core. E) It is not fusing any element; it is contracting and heating up.
A tennis ball bounces on the floor three times, and during each bounce 23% of its kinetic energy (assuming that at the collision with the floor the ball-Earth system only had kinetic energy) is converted to internal energy
How high does it go after the third bounce, if we released it 4.0 m from the floor? A) 180 cm B) 18 cm C) 180 mm D) 240 cm
A 160 lb person has a mass of 160/32 = 5 slugs. A 160 lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. After moving downwards at constant speed, the elevator is slowing down at 2 m/s2 as it is coming to rest
a. 150 lb c. 170 lb b. 160 lb d. none of the above