If the universe is flat
a. its age will be equal to 1/H.
b. its age will be equal two-thirds of 1/H.
c. the density of the universe is less than the critical density.
d. the density of the universe is greater than the critical density.
e. dark matter accounts for a small fraction of the density of the universe.
B
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Saturation and condensation are more likely to occur in
A) warm air than in cool air. B) air with a low relative humidity. C) cool air than in warm air. D) an adiabatic air mass.
Calculate the linear speed due to the Earth's rotation for a person at the equator of the Earth. The radius of the Earth is 6.40 × 10^6 m
a. 74.0 m/s b. 233 m/s c. 465 m/s d. 73.0 m/s
A soda can with a small amount of water is on a hot stove. Soon steam comes from its opening. When the can is quickly inverted into a pan of water, the can is crushed by
A) suction of the can interior. B) condensation. C) atmospheric pressure. D) a drop in temperature.
A 1.5-kg cart attached to an ideal spring with a spring constant of 20 N/m oscillates on a horizontal, frictionless track
At time t = 0.00 s, the cart is released from rest at position x = 10 cm from the equilibrium position. (a) What is the frequency of the oscillations of the cart? (b) Determine the maximum speed of the cart. Where does the maximum speed occur? (c) Find the maximum acceleration of the mass. Where does the maximum acceleration occur? (d) How much total energy does this oscillating system contain? (e) Express the displacement as a function of time using a cosine function.