Assume molecules have an average diameter of 3.00 × 10^?10 m. How many times larger is the mean free path than the diameter at one atmosphere and 0°C?
a. 500
b. 300
c. 700
d. 1 000
e. 2 500
b
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A 10-kg block on a rough horizontal surface is attached to a light spring (force constant = 1.4 kN/m). The block is pulled 8.0 cm to the right from its equilibrium position and released from rest. The frictional force between the block and surface has a magnitude of 30 N. What is the kinetic energy of the block as it passes through its equilibrium position?
a. 4.5 J b. 2.1 J c. 6.9 J d. 6.6 J e. 4.9 J
The halo in the Milky Way is a part of the _____ of the galaxy
A) disk component B) spherical component C) central bulge D) spiral arms
What did Galileo discover about Jupiter that supported Copernicus?
What will be an ideal response?
Besides the aerosol sprays, another source of chlorofluorocarbons is
A) fossil fuels. B) biomass fuels. C) Both of the above. D) refrigerants. E) jet exhaust.