When does kinetic friction occur in trying to push a heavy object?
a. When the object is still.
b. When the force you apply is smaller than the maximum static frictional force.
c. Just before enough force is applied to move the object.
d. When the force you apply is larger than the maximum static frictional force.
e. When the force you apply is insufficient to set the object in motion.
d
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Suppose there are 3 molecules in a container. If each molecule has a 1-in-2 chance of being in the left half of the container, what is the probability that there are exactly 2 molecules in the left half of the container?
A. 1/2 B. 1/3 C. 1/8 D. 3/8 E. 3/5
A particle (q = +5.0 ?C) is released from rest when it is 2.0 m from a charged particle which is held at rest. After the positively charged particle has moved 1.0 m toward the fixed particle, it has a kinetic energy of 50 mJ. What is the charge on the fixed particle?
A. ?2.2 ?C B. +6.7 ?C C. ?2.7 ?C D. +8.0 ?C E. ?1.1 ?C
If the momentum of an electron is 1.95 × 10-27 kg?m/s, what is its de Broglie wavelength?
A) 340 nm B) 210 nm C) 170 nm D) 420 nm E) 520 nm
The molar specific heat is the amount of heat required to raise the temperature of what amount of matter by one unit of temperature?
A) one tooth B) one unit of mass of a material C) one mole of a substance D) two moles of a substance E) one molecule of a substance