Relative to the frame of the observer making the measurement, at what speed parallel to its length is the length of a meterstick 60 cm?
A) 0.60c B) 0.70c C) 0.50c D) 0.90c E) 0.80c
E
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Quasars are caused by galaxy collisions in the early Universe
a. True b. False Indicate whether the statement is true or false
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 816 and 260°C, respectively. Determine the rate of heat transfer by radiation between the plates in W/m2 and the radiative heat transfer coefficient in W/(m2 K).
GIVEN
• Two large parallel plates, approximately black bodies
• Temperatures
? T1 = 816°C = 1089 K
? T2 = 260°C= 533 K FIND
(a) Rate of radiative heat transfer (qr/A) in W/m2 (b) Radiative heat transfer coefficient (hr) in W/(m2 K) ASSUMPTIONS
• Steady state prevails
• Edge effects are negligible
SKETCH
PROPERTIES AND CONSTANTS
Stefan-Boltzmann constant (?) = 5.67 ? 10–8 W/(m2 K)
A helicopter is flying horizontally with a speed of 444 m/s over a hill that slopes upward with a 2% grade (that is, the "rise" is 2% of the "run")
What is the component of the helicopter's velocity perpendicular to the sloping surface of the hill? A) 8.9 m/s B) 220 m/s C) 435 m/s D) 444 m/s
In Fizeau's experiment to measure the speed of light, the wheel has 475 notches and rotates with a speed of 40.0 rev/sec. Light passing through one notch travels to the mirror and back just in time to pass through the next notch
If the distance between the wheel and the mirror is 7890 m, what is the speed of light measured by this experiment? A) 3.00 × 108 m/s B) 3.00 × 10-8 m/s C) 3.22 × 108 m/s D) 3.22 × 10-8 m/s E) 2.25 × 108 m/s