A copper wire of 1.0 cm2 cross-sectional area would have to be how long to have a resistance of 1.0 ohm?
A) 5.9 m
B) 5.9 Mm
C) 5.9 km
D) 5.9 × 102 m
E) 5.9 × 104 m
C
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Photon Energy: A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
In the vulcanization of tires, the carcass is placed into a jig and steam at 149°C is admitted suddenly to both sides. If the tire thickness is 2.5 cm, the initial temperature is 21°C, the heat transfer coefficient between the tire and the steam is 150 W/(m2 K), and the specific heat of the rubber is 1650 J/(kg K), estimate the time required for the center of the rubber to reach 132°C.
GIVEN
• Tire suddenly exposed to steam on both sides
• Steam temperature (T?) = 149°C
• Tire thickness (2L) = 2.5 cm = 0.025 m
• Initial tire temperature (To) = 21°C
• The heat transfer coefficient (hc) = 150 W/(m2 K)
• The specific heat of the rubber (c) = 165 J/(kg K)
FIND
• The time required for the central layer to reach 132°C
ASSUMPTIONS
• Shape effects are negligible, tire can be treated as an infinite plate
SKETCH
A ball is thrown at an angle of ? above the horizontal. If there is no acceleration due to gravity the ball will follow a straight-line path
Indicate whether the statement is true or false
A dog is standing in the bed of a pickup truck. The bed is coated with ice, causing the force of friction between the dog and the truck to be zero. The truck is initially at rest, and then accelerates to the right, moving along a flat road
As seen from a stationary observer (watching the truck move to the right), the dog A) does not move left or right, but the back of the truck moves towards the dog. B) moves to the left, as the truck moves to the right, causing the dog to slide towards the back of the truck. C) moves to the right at the same rate as the truck, so it doesn't slide. D) moves to the right, but not as quickly as the truck is moving to the right, causing it to slide towards the back of the truck.