A certain light source blinks once per second in its own frame of reference. As you recede from the blinking source, you observe the frequency of blinks to be
A) less than 1 Hz.
B) 1 Hz.
C) more than 1 Hz.
Answer: A
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Which kind of interstellar spacecraft collects its fuel during its passage?
A) interstellar ark B) matter-antimatter rocket C) solar sail D) interstellar ramjet
Fluid Flow: An ideal incompressible fluid flows at 0.252 m/s through a 44-mm diameter cylindrical pipe. The pipe widens to a square cross sectional area that is 5.5 cm on a side. Assume steady flow throughout the system.(a) What is the speed of the fluid through the square section of pipe?(b) What is the flow rate in liters per minute?
What will be an ideal response?
The acceleration of a Tesla that maintains a constant velocity of 120 km/h over a time of one-half hour is
A) 60 km/h. B) 120 km/h. C) 240 km/h. D) zero because of no change in velocity.
Heat Engines: A heat engine with an efficiency of 30% performs 2500 J of work. How much heat is discharged to the lower temperature reservoir?
A. 5800 J B. 8300 J C. 750 J D. 1400 J E. 7100 J