Earth is held in its orbit by the gravitational force of the Sun. Therefore, the force that the Sun exerts on Earth is ____ that Earth exerts on the Sun.
A. greater than
B. smaller than
C. the same as
Ans: C. the same as
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Galileo's observations of the entire phase cycle of Venus proved that Ptolemy's epicycles could not be correct in keeping Venus between us and the Sun
Indicate whether the statement is true or false
Dielectrics: A parallel-plate capacitor with plate separation of 4.0 cm has a plate area of 6.0 × 10-2 m2.What is the capacitance of this capacitor if a dielectric material with a dielectric constant of 2.4 is placed between the plates, completely filling the space? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 3.7 × 10-12 F B. 3.7 × 10-14 F C. 16 × 10-14 F D. 32 × 10-14 F E. 32 × 10-12 F
Equilibrium: A 3.00-m-long ladder, weighing 200 N, leans against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.00 m away from the wall. The ladder is not completely uniform, so its center of gravity is 1.20 m from its base. What force of friction must the floor exert on the base of the ladder to prevent the ladder from sliding down?
A. 93.3 N B. 130 N C. 28.3 N D. 102 N E. 150 N
During a slow adiabatic expansion of a gas:
A. the pressure remains constant B. energy is added as heat C. work is done on the gas D. no energy enters or leaves as heat E. the temperature is constant