A material's capacity to transmit fluids is called its
a. permeability.
b. solifluction.
c. drift.
d. porosity.
a
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A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A horizontal 140-N force is applied to the box. What is the friction force on the box?
A) 140 N B) 42 N C) 16.5 N D) 160 N E) 0.00 N
A 1 500-kg experimental rocket sled at rest on level frictionless rails is loaded with 55.0 kg of propellant. It exhausts the propellant in a 20-s "burn." The rocket moves at 155 m/s after the burn. What average force is experienced by the rocket during the burn?
a. 4.26E+2 N b. 1.16E+4 N c. 1.21E+4 N d. 1.94E+2 N e. 2.33E+5 N
Which statement below is NOT an assumption made in the molecular model of an ideal gas?
a. The average separation between molecules is large compared with the dimensions of the molecules. b. The molecules undergo inelastic collisions with one another. c. The forces between molecules are short range. d. The molecules obey Newton's laws of motion. e. Any molecule can move in any direction with equal probability.
Sound travels through the air in the form of
1) transverse waves, 2) longitudinal waves, and radio signals travel through the air in the form of 3) transverse waves. 4) longitudinal waves.