A cyclist does work at the rate of 500. W while riding. With how much average horizontal force does the wheel push when she is traveling at 10. m/s?
What will be an ideal response?
50. N
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Astronomers measure distances across the sky as _____
A) angles expressed in units of degrees and subdivisions of degrees B) volume expressed in units of gallons and pints C) energy expressed in units of calories and joules D) length expressed in units of miles and yards
What is the maximum kinetic energy (in eV) of a photoelectron when a surface, whose work function is 5.0 eV, is illuminated by photons whose wavelength is 400 nm?
a. 3.1 b. -1.9 c. 1.9 d. 0 e. 1.2
A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 39.6 kHz. A car is approaching him at a speed of 35.0 m/s
The wave is reflected by the car and interferes with the emitted sound producing beats. What is the frequency of the beats? The speed of sound in air is 343 m/s. A) 5000 Hz B) 4500 Hz C) 8490 Hz D) 9000 Hz E) 4250 Hz
What force(s) are responsible for the collapse of an interstellar cloud?
a. nuclear b. gravity c. electric d. magnetic e. both c and d