Equilibrium: A 30.0-kg load is being held in place using massless wires in the ideal pulley arrangement shown in the figure. What is the magnitude of the force F?
Fill in the blank(s) with the appropriate word(s).
147 N
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As a particle moves along the x axis it is acted upon by a single conservative force given by Fx = (20 ? 4.0x) N where x is in m. The potential energy associated with this force has the value +30 J at the origin (x = 0). What is the value of the potential energy at x = 4.0 m?
a. ?48 J b. +78 J c. ?18 J d. +48 J e. +80 J
An object requires a force of 30 N to hold it under water. The object weighs 90 N in air. Its density is nearest:
The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because ___________just as in the Ptolemaic system
a. the Copernican system assumed the Earth was at rest at the center. b. the Copernican system used elliptical planetary orbits c. the Copernican system used uniform circular motion. d. the Copernican system assumed all planets orbited the Sun
T V ^(??1) is constant for an ideal gas undergoing an adiabatic process, where ? is the ratio of heat capacities Cp/Cv. This is a direct consequence of:
A. the zeroth law of thermodynamics alone B. the zeroth law and the ideal gas equation of state C. the first law of thermodynamics alone D. the ideal gas equation of state alone E. the first law and the equation of state