The speed of waves in stretched string depends on which of the following?
A. the tension in the string
B. the amplitude of the waves
C. the wavelength of the waves
D. the frequency of the waves
A. the tension in the string
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This graph shows how the time dilation factor (t?/t) depends on the speed of an object moving by you. How fast does an object have to be moving for you to see its time running about 20% slower than normal (about 80% of normal)?
A) 0.6c B) 0.2c C) 0.8c D) None of the choices are correct; time must be the same for everyone.
Is it feasible to construct an air-filled parallel-plate capacitor that has its two plates separated by 0.10 mm and has a capacitance of 1.0 F? Why or why not?
What will be an ideal response?
A proton moves across the Earth's equator in a northeasterly direction. At this point the Earth's magnetic field has a direction due north and is parallel to the surface. What is the direction of the force acting on the proton at this instant?
a. toward the northwest b. out of the Earth's surface c. into the Earth's surface d. toward the northeast
Radioactive decay was discovered in 1896 by
a. Ernest Rutherford. b. Niels Bohr. c. Henri Becquerel. d. Marie and Pierre Curie.