If the 5th order minimum in the diffraction pattern is at 40°, what is the highest order minimum in the pattern?
A)
6
B)
11
C)
8
D)
7
E)
9
D
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What do we mean when we say that a particle is weakly interacting?
A) It interacts with other particles only through the weakest force, gravity. B) It interacts only with other weak particles, such as neutrinos. C) It doesn't interact with any type of baryonic matter. D) It interacts with other particles only through the weak force. E) It interacts with other particles only through the weak force and the force of gravity.
If the z-component of the magnetic field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation Bz(x, t) = (1.25 ?T) cos[(3800 m-1)x - (1.14 × 10-12 rad/s)t],
what is the largest that the y component of the electric field can be? (c = 3.0 x 108 m/s) A) 375 N/C B) 4.17 × 10-15 N/C C) 3.75 × 108 N/C D) 4.17 × 10-9 N/C E) 1.25 × 106 N/C
Heat transfer from an electronic circuit board is to be determined by placing a model for the board in a wind tunnel. The model is a 15-cm-square plate with embedded electrical heaters. The wind from the tunnel air is delivered at 20°C. Determine the average temperature of the model as a function of power dissipation for an air velocity of 2.5 and 10 m/s. The model is pitched 30° and yawed 10° with respect to the flow direction. The surface of the model acts as a blackbody.
GIVEN
• A Model square electronic circuit board pitched 30° and yawed 10° in a wind tunnel
• Length of a side (L) = 15 cm = 0.15 m
• Air temperature (T?) = 20°C = 293 K
• Air velocity (U?) = 2.5 m/s or 10 m/s FIND
• The average surface temperature of the model (Ts) as a function of power dissipation (Q )
ASSUMPTIONS
Steady state
The surface of the model acts as a black body (? = 1.0)
The wind tunnel acts as a black body enclosure at the air temperature.
SKETCH
The small circles in the diagram below represent the positions along the x axis of a body at equal time intervals. Assume the body moves in a straight line
This diagram is most likely to describe
a.
a swimmer swimming laps.
b.
an exercise on a rowing machine.
c.
a person on a treadmill.
d.
a tennis ball during a volley.
e.
a runner who tripped, fell, rose, and continued racing.