It takes 40 J to push a large crate 4 m across a floor. The force exerted on the crate is
A) 4 N.
B) 10 N.
C) 40 N.
D) 160 N.
E) 1600 N.
Answer: B
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The weight of the insulation in a spacecraft may be more important than the space required. Show analytically that the lightest insulation for a plane wall with a specified thermal resistance is the insulation that has the smallest product of density times thermal conductivity.
GIVEN Insulating a plane wall, the weight of insulation is most significant FIND Show that lightest insulation for a given thermal resistance is that insulation which has the smallest product of density (?) times thermal conductivity (k) ASSUMPTIONS One dimensional heat transfer through the wall Steady state conditions
Charge is distributed uniformly on the surface of a spherical nonconducting shell. A point particle with charge q is inside. The electrical force on the particle q is least when:
A) it is near the inside surface of the shell B) it is at the center of the shell C) it is halfway between the shell center and the inside surface D) it is near, but not at, the center of the shell E) all of the above (the force is zero everywhere inside)
A barge is 10 m wide and 60 m long and has vertical sides. The bottom of the boat is 1.2 m below the water surface. What is the weight of the barge and its cargo, if it is floating in fresh water of density 1000 kg/m3?
A) 3.5 MN B) 6.4 MN C) 6.8 MN D) 7.1 MN E) 9.5 MN
The most important effect in clearing the solar nebula of gas and dust was
a. impacts by planetesimals. b. the solar wind. c. the Sun's magnetic field. d. the asteroid belt. e. radiation pressure.