A current-carrying 2.0-cm long segment of wire is inside a long solenoid (radius = 4.0 cm, n = 800 turns/m, current = 50 mA). The wire segment is oriented perpendicularly to the axis of the solenoid. If the current in the wire segment is 12 A, what is the magnitude of the magnetic force on this segment?
a. 22 mN
b. 16 mN
c. 18 mN
d. 12 mN
e. 0 mN
D
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Bainite is formed by the following procedure with a eutectoid composition carbon steel starting at 800°C (1472°F):
(a) Quench to 500°C (932°F), then hold for 100 seconds, then cool to room temperature. (b) Quench to 600°C (1112°F), then hold for 100 seconds, then cool to room temperature. (c) Quench to 700°C (1292°F), then hold for 100 seconds, then cool to room temperature. (d) Quench to room temperature in 10 seconds.
Protoplanets
a. grew in size primarily by accretion. b. grew in size primarily by condensation. c. are still visible today as the terrestrial planets. d. grew in size by collecting the particles in the solar wind. e. grew in size by the collision and coalescing of planetesimals.
A particle (mass = 6.0 mg) moves with a speed of 4.0 km/s in a direction that makes an angle of 37° above the positive x axis in the xy plane. At the instant it enters a magnetic field of (5.0 ) mT it experiences an acceleration of (8.0 ) m/s2 . What is the charge of the particle?
a. ?4.8 ?C b. 4.0 ?C c. ?4.0 ?C d. 4.8 ?C e. ?5.0 ?C
How much heat is required to change one gram of 0°C ice to 120°C steam?
A) 48.7 cal B) 120 cal C) 540 cal D) 730 cal E) 1505 cal