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) 1.3 mA
B) 9.2 mA
C) 7.5 mA
D) 4.2 mA
E) 2.6 mA
E
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A toy rocket is launched vertically from ground level (y = 0.00 m), at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase
At the instant of engine burnout, the rocket has risen to 72 m and acquired a velocity of 30 m/s. The rocket continues to rise in unpowered flight, reaches maximum height, and falls back to the ground with negligible air resistance. The speed of the rocket upon impact on the ground is closest to A) 48 m/s B) 44 m/s C) 39 m/s D) 54 m/s E) 59 m/s
The primary source of the Sun's energy is
A) oxidation of carbon in the core. B) dark energy. C) gravitational collapse of the helium towards the core. D) the weak force creating energy from uranium decay. E) the strong force fusing hydrogen into helium.
A man in a gym is holding an 8.0-kg object at arm's length, a distance of 0.55 m from his shoulder joint. What is the torque about his shoulder joint due to the object if his arm is horizontal?
A) 0.24 N ? m B) 4.4 N ? m C) 43 N ? m D) 15 N ? m E) 0 N ? m
What is the symbol for the element whose atoms have 92 protons each?
a. Nb b. U c. Zn d. None of these