At the beach you see a friend facing away from you. Keeping quiet you can cause her to turn around by
A) staring intently at her back.
B) tossing small pebbles at her back.
C) although staring will be less effective, both will affect a turn-around.
D) none of the above
Answer: B
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Many medium-mass stars will expel its outer atomosphere to form a(n) _______________ nebula as they age
Fill in the blank(s) with correct word
A 1.5-kg mass attached to spring with a force constant of 20.0 N/m oscillates on a horizontal, frictionless track. At t= 0, the mass is released from rest at x= 10.0 cm. (That is, the spring is stretched by 10.00 cm
) (a) Determine the frequency of the oscillations. (b) Determine the maximum speed of the mass. Where does the maximum speed occur? (c) Determine the maximum acceleration of the mass. Where does the maximum acceleration occur? (d) Determine the total energy of the oscillating system. (e) Express the displacement as a function of time.
A cylinder containing an ideal gas has a volume of 3.0 m3 and a pressure of 1.0 × 10^5 Pa at a temperature of 300 K. The cylinder is placed against a metal block that is maintained at 900 K and the gas expands as the pressure remains constant until the temperature of the gas reaches 900 K. The change in internal energy of the gas is 9.0 × 10^5 J. Find the change in entropy of the block
associated with the heat transfer to the gas. a. 0 c. -1700 J/K b. +670 J/K d. -1100 J/K