Observer A sees a pendulum oscillating back and forth in a relativistic rocket and measures its period to be TA
Observer B moves along with the rocket and measures the period of the pendulum to be TB. What is true about these two time measurements?
A) TA = TB
B) TA < TB
C) TA > TB
D) TA could be greater or smaller than TB depending on the direction of the motion.
C
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Conduction: A heat-conducting rod, 0.90 m long and wrapped in insulation, is made of an aluminum section that is 0.20 m long and a copper section that is 0.70 m long. Both sections have a cross-sectional area of 0.00040 m2. The aluminum end and the copper end are maintained at temperatures of 30°C and 230°C, respectively. The thermal conductivities of aluminum and copper are 205 W/m ? K (aluminum) and 385 W/m ? K (copper). What is the temperature of the aluminum-copper junction in the rod with steady state heat flow?
A. 100°C B. 93°C C. 86°C D. 80°C E. 74°C
At what orientation angle relative to the magnetic field direction does the magnetic potential energy of a magnetic dipole have its largest value?
a) 0° b) 45° c) 90° d) 135° e) 180°
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If 
and 
, what is the magnitude of the vector 
?
A. 42
B. 22
C. 64
D. 90
E. 13
A microwave oven operates with sinusoidal microwaves at a frequency of 2400 MHz. The height of the oven cavity is 25 cm and the base measures 30 cm by 30 cm
Assume that microwave energy is generated uniformly on the upper surface of the cavity and propagates directly downward toward the base. The base is lined with a material that completely absorbs microwave energy. The total microwave energy content of the cavity is 0.50 µJ. What is the amplitude of the electric field? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2) A) 1600 V/m B) 1900 V/m C) 2200 V/m D) 2500 V/m E) 2800 V/m