A mass 
is connected by a light string that passes over a pulley of mass M to a mass 
as shown in the figure. Both masses move vertically and there is no slippage between the string and the pulley. The pulley has a radius of 20.0 cm and a moment of inertia of 1?2 
If 
is 3.00 kg, 
is 6.00 kg and M is 4.00 kg, then what is the acceleration of the masses?
A. 5.05 
B. 4.75
C. 4.05
D. 3.44
E. 2.67
E. 2.67
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The type of radiation that fogged Becquerel’s photographic plates was probably
A. Alpha radiation. B. Beta radiation. C. Gamma radiation. D. Either alpha or beta radiation. E. Either beta or gamma radiation.
The addition of aluminum fins has been suggested to increase the rate of heat dissipation from one side of an electronic device 1-m-wide and 1-m-tall. The fins are to be rectangular in cross section, 2.5-cm-long and 0.25-cm-thick. There are to be 100 fins per meter. The convective heat transfer coefficient, both for the wall and the fins, is estimated at 35 W/(m2 K). With this information, determine the per cent increase in the rate of heat transfer of the finned wall compared to the bare wall.
GIVEN
Aluminum fins with a rectangular cross section
Dimensions: 2.5-cm-long and 0.25-mm-thick
Number of fins per meter = 100
FIND
The per cent increase in the rate of heat transfer of the finned wall compared to the bare wall
ASSUMPTIONS
Steady state heat transfer
SKETCH
A horizontal desk surface measures 1.3 m by 1.0 m. If the Earth's magnetic field has a magnitude of 0.44 mT and is directed 65
below the horizontal, what is the magnetic flux through the desk surface?
a. 
b. 
c. 
d. 
During the Kelvin-Helmholtz contraction phase, a protostar has a much ________ brightness as compared to the Sun
Fill in the blank(s) with correct word