Which two bodies show evidence of heavy cratering?
a. Mercury and Venus
b. Mercury and Earth
c. Mercury and Earth’s Moon
d. Earth and Venus
e. Earth and Mars
Answer : c. Mercury and Earth’s Moon
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The only two forces acting on a body have magnitudes of 20 N and 35 N and directions that differ by 80°. The resulting acceleration has a magnitude of 20 m/s2. What is the mass of the body?
a. 2.4 kg b. 2.2 kg c. 2.7 kg d. 3.1 kg e. 1.5 kg
Earth's magnetism demonstrates that:
A) part of Earth's core must be a liquid metal. B) Earth's core is completely made of nickel. C) a large part of Earth's crust is made up of metal. D) Earth's crust is mainly composed of magnetic material.
A particle experiences a force given by F(x) = ? - ?x3. Find the potential field U(x) the particle is in. (Assume that the zero of potential energy is located at x = 0.)
A) U(x) = -?x + x4 B) U(x) = ?x - x4 C) U(x) = 3?x2 D) U(x) = -3?x2
A sealed container holds 0.020 moles of nitrogen (N2) gas at a pressure of 1.5 atmospheres and a temperature of 290 K. The atomic mass of nitrogen is 14 g/mol
The Boltzmann constant is 1.38 × 10-23 J/K and the ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K. The average translational kinetic energy of a nitrogen molecule is closest to A) 4.0 × 10-21 J. B) 6.0 × 10-21 J. C) 8.0 × 10-21 J. D) 10 × 10-21 J. E) 12 × 10-21 J.