Of EM waves having these wavelengths, which would be visible?
a. 100 nm
b. 500 nm
c. 1000 nm
d. 1 nm
e. none of the above
B
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A circular loop carrying a current of 1.25 A is oriented in a magnetic field of 0.22 T. The loop has an area of 0.10 m2 and is mounted on an axis, perpendicular to the magnetic field, which allows the loop to rotate. If the plane of the loop is oriented parallel to the field, what torque is created by the interaction of the loop current and the field?
a. 0.018 N?m b. 2.8 N?m c. 0.028 N?m d. 0.014 N?m e. 57 N?m
A 50-gram sample of dry ice (solid CO2) is placed in a 4-liter container. The system is sealed and allowed to reach room temperature (20°C). By approximately how much does the pressure inside the container increase when the dry ice turns to gas? (Ignore the initial volume of the sample.)
A 9.00 kg mass is connected to a spring with a spring constant of 4.00 N/m. The velocity is given by the expression v(t) = 10.0 cm/s sin
+ 8.00 cm/s cos
What is the maximum displacement of the simple harmonic motion?
A. 25.1 cm B. 30.5 cm C. 35.3 cm D. 40.4 cm E. 45.5 cm
A large number of 3.8 cm OD pipes carrying hot and cold liquids are embedded in concrete in an equilateral staggered arrangement with center line 11.2 cm apart as shown in the sketch. If the pipes in rows A and C are at 16°C while the pipes in rows B and D are at 66°C, determine the rate of heat transfer per foot length from pipe X in row B.
GIVEN
A large number of pipes embedded in concrete as shown below
Outside diameter of pipes (D) = 3.8 cm
The temperature of the pipes in rows A and C = 16°C
The temperature of the pipes in rows B and D = 66°C
FIND
The rate of hat transfer per foot length from pipe X in row B
ASSUMPTIONS
Steady state, two dimensional heat transfer
Uniform thermal conductivity in the concrete
SKETCH
