The magnetic fields of a pair of nearby magnets can
A) only add.
B) cannot add or subtract.
C) add or subtract by vector rules.
Answer: C
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Power: When 5.00 A is flowing through an 10.0-? device, how much power is being dissipated in the device?
A. 50.0 W B. 250 W C. 500 W D. 2.50 kW
Which of the following is not a suitable application for a noble metal?
(a) Large parts in sea water, such as a ship hull (b) Catalytic converters (c) Human body implants (d) Satellite parts
A large slab of steel 0.1-m-thick contains a 0.1-m-diameter circular hole, whose axis is normal to the surface. Considering the sides of the hole to be black, specify the rate of radiative heat loss from the hole. The plate is at 811 K, the surroundings are at 300 K.
GIVEN
• A large slab of steel with a hole whose axis is normal to the surface
• Slab thickness (S) = 0.1 m
• Hole diameter (D) = 0.1 m
• Plate temperature (T1) = 811 K
• Temperature of surrounding (T?) = 300 K
FIND
• The rate of radiative heat loss from the hole (qr)
ASSUMPTIONS
• The sides of the hole are black
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
A 70-kg high jumper leaves the ground with a vertical velocity of 6.0 m/s. How high can he jump?