The force of friction between two surfaces is independent of the area of contact between the surfaces
Indicate whether the statement is true or false
TRUE
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A simple pendulum of length 2.00 m is used to measure the acceleration of gravity at the surface of a distant planet. If the period of such a pendulum is 7.00 s, what is the acceleration of gravity?
A) 7.89 m/s2 B) 6.78 m/s2 C) 1.61 m/s2 D) 0.513 m/s2 E) 17.8 m/s2
What is postulated to have caused a sudden inflation of the early universe?
A) the energy absorbed by giant quantum fluctuations B) the energy released from the "freezing out" of the strong force from the GUT force C) the energy released from the annihilation of matter and antimatter D) the energy absorbed by the separation of the electromagnetic and weak forces E) the energy released in the fusion of protons and neutrons to produce helium
A beetle (black dot on the top view shown below) sits on a rapidly rotating turntable. The table rotates faster and faster, and eventually the beetle loses its grip. What is its subsequent trajectory relative to the ground (assuming it cannot fly)?
A. A
B. B
C. B
D. D
E. E
According to kinetic theory, a typical gas molecule in thermal equilibrium at room temperature has a kinetic energy K = 6.00 × 10?21 J, regardless of mass. Estimate the speed at room temperature of a hydrogen molecule H2 (m = 3.34 × 10?27 kg) and a xenon atom (m = 2.00 × 10?25 kg). [kB = 1.38 × 10?23 J/K]
What will be an ideal response?