Consider a child who is swinging. As she reaches the lowest point in her swing:
a. the tension in the rope is equal to her weight.
b. the tension in the rope is equal to her mass times her acceleration.
c. her acceleration is downward at 9.8 m/s2.
d. none of the above.
d
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What happens in the double-slit experiment with electrons if we place an electron detector just behind one of the slits?
A) This tells us which slit each electron comes through, and has no effect on the pattern formed on the screen. B) This tells us which slit each electron comes through, but it also changes the pattern formed on the screen. C) This provides no information concerning which slit each electron comes through, but it does change the pattern formed on the screen. D) This provides no information concerning which slit each electron comes through, and has no effect on the pattern formed on the screen. E) We can then predict the precise point at which the electron will strike the screen.
The Big Bang predicts that one in four atoms in the universe is helium
Indicate whether the statement is true or false
Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the rock tends at first to
A) continue in a circular path. B) follow a straight-line path. C) spiral inward. D) fall straight downward.
Banked Curves: A highway curve of radius 100 m, banked at an angle of 45°, may be negotiated without friction at a speed of
A. 22 m/s. B. 31 m/s. C. 44 m/s. D. 67 m/s.