Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.The quantity mv is
a. the kinetic energy of the crate.
b. the potential energy of the crate.
c. the linear momentum of the crate.
d. the work you do on the crate.
e. the power you supply to the crate.
c
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What age does radiometric dating give for Moon rocks and meteorites?
a. zero b. about 6000 years c. about 4 million years d. about 4 billion years e. about 14 billion years
Calculate the temperature drop from the center line to the surface for a 2.5 cm diameter rod having a thermal conductivity of 26 W/(m K) if the rate of heat removal from its surface is 1.6 MW/ m2 .
In a cylindrical fuel rod of a nuclear reactor, heat is generated internally according to the
equation
GIVEN
• A cylindrical rod with internal generation and heat removal from its surface
• Outside diameter (Do) = 2.5 cm=0.025 m
• Rate of heat generation is as given above
• Thermal conductivity (k) = 26 W/(m K)
• Heat removal rate (q/A) = 1.6 MW/m2
FIND
• The temperature drop from the center line to the surface (?T)
ASSUMPTIONS
• The heat flow has reached steady state
• The thermal conductivity of the fuel rod is constant
• One dimensional conduction in the radial direction
SKETCH
A very long thin wire produces a magnetic field of 0.0050 × 10-4 T at a distance of 3.0 mm. from the central axis of the wire. What is the magnitude of the current in the wire? (?0 = 4? × 10-7 T ? m/
A) A) 7.5 mA B) 1.7 mA C) 3300 mA D) 24,000 mA
Imagine a magnetic field pointing into the plane of this page. An electron moves across the paper from left to right. The direction of the magnetic force on the electron will be
A. out of the plane of the paper. B. in the plane of the paper and toward the bottom of the page. C. into the plane of the paper. D. in the plane of the paper and toward the top of the page. E. in the plane of the paper and opposite the electron's velocity.