An object moving at a constant speed requires 6.0 s to go once around a circle with a diameter of 4.0 m. What is the magnitude of the instantaneous acceleration of the particle during this time?
a. 2.2 m/s2
b. 2.7 m/s2
c. 3.3 m/s2
d. 3.8 m/s2
e. 4.4 m/s2
a
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Ray says that interference effects cannot be observed with visible light because random phase changes occur in time intervals less than a nanosecond. Stacy says that doesn't matter if collimated light from a single source reaches multiple openings. (They are arguing about a light source 50.0 cm away from two 0.0100-mm-wide slits, 2.00 mm apart, with a screen 1.00 m away from the slits.) Which one, if either, is correct, and why?
A. Ray, because the phases at the two slits will be random and different. B. Ray, because it takes light over 3 ns to travel 1.00 m to the screen. C. Stacy, because the difference in time of travel from the source to the slits is no more than about 7 × 10?12 s. D. Stacy, but only if a lens is placed in front of the slits. E. Both, because interference of light never occurs outside a physics lab.
If the same impulse is applied to a ping-pong ball and a baseball, the change in the ping-pong ball's momentum will be ________ the baseball's.
What will be an ideal response?
A current in a solenoid coil creates a magnetic field inside that coil. The field strength is directly proportional to:
a. Both A and B are valid choices. c. the coil area. b. the current. d. None of the above choices are valid.
What happens during the apparent retrograde motion of a planet?
A) The planet appears to move eastward with respect to the stars over a period of many nights. B) The planet moves through constellations that are not part of the zodiac. C) The planet rises in the west and sets in the east. D) The planet moves backward in its orbit around the Sun. E) The planet moves backward through the sky.