You carry a 20-N box 5 m horizontally across a room. The work you do is __________
Fill in the blank(s) with correct word
zero
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A material that can permanently deform extensively before breaking is ______________.
Fill in the blank(s) with the appropriate word(s).
The mass of an atom of carbon-12 (Z = 6) is less than the mass of 6 protons and 6 neutrons because of __________
Fill in the blank(s) with correct word
What is the mean free path of molecules in an ideal gas in which the mean collision time is 3.00 × 10-10 s, the temperature is 300 K,
and the mass of the molecules is 6.00 × 10-25 kg? Assume that the molecules are moving at their root-mean-square speeds. The Boltzmann constant is 1.38 × 10-23 J/K. A) 7.22 × 10-8 m B) 4.32 × 10-8 m C) 9.19 × 10-8 m D) 1.39 × 10-8 m E) 6.71 × 10-8 m
Identical point charges (+20 ?C) are placed at the corners of an equilateral triangle with sides of 2.0-m length. How much external energy is required to bring a charge of 45 ?C from infinity to the midpoint of one side of the triangle?
a. 26 J b. 16 J c. 23 J d. 21 J e. 12 J