A book is placed on a chair. Then a videocassette is placed on the book. The floor exerts a normal force
a. on all three.
b. only on the book.
c. only on the chair.
d. upwards on the chair and downwards on the book.
e. only on the objects that you have defined to be part of the system.
c
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Two resistors of 5.0 and 9.0 ? are connected in parallel. A 4.0-? resistor is then connected in series with the parallel combination. A 6.0-V battery is then connected to the series-parallel combination
(a) What is the current through the 4.0-? resistor? (b) What is the current through the 5.0-? resistor? (c) What is the current through the 9.0-? resistor?
An electron is accelerated from rest through a potential difference of 1.02 MeV. If the rest energy of the electron is 0.51 MeV, how fast is the electron moving?
A. 0.57 c B. 0.30 c C. 0.67 c D. 0.90 c E. 0.94 c
What do you see orbiting Earth in this photo?
A) the Hubble Space Telescope B) the world's largest visible-light telescope C) the Spitzer infrared telescope D) the International Space Station
Suppose a ball is dropped from shoulder height, falls, makes a perfectly elastic collision with the floor, and rebounds to shoulder height. Compare the magnitudes of the impulses delivered to the ball by gravity and by the floor during this entire motion.
A. The floor delivers an upward impulse, but gravity does not deliver a total impulse B. The two impulses have the same magnitude C. The impulse delivered by the floor is half as large as the impulse delivered by gravity D. The impulse delivered by the floor is twice as large as the impulse delivered by gravity