A 0.50-m long solenoid consists of 1 000 turns of copper wire wound with a 4.0 cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is
a. 0.090 mT.
b. 0.36 mT.
c. 23 mT.
d. 36 mT.
e. 45 mT.
E
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A certain bulb with a resistance of 95 ohms and labeled "150 W" is designated for use in a
A) 120-V circuit. B) 240-V circuit. C) either D) not enough information
A constant force is applied to an object that causes a certain displacement. If the angle between the force and the displacement is 135°, the work done by this force is
A) positive. B) negative. C) 0 J. D) Cannot be determined without knowing the magnitude of the displacement. E) Cannot be determined without knowing the magnitude of the applied force.
Young Earth developed a layered structure under the influence of
A) impact heating and convection in its interior. B) gravitational contraction and radioactive decay. C) meteorite bombardment. D) gravity and density segregation—the process of differentiation.
A quantity of monatomic ideal gas expands adiabatically from a volume of 2.5 liters to 6.3 liters. If the initial pressure is P0, what is the final pressure?
a. 2.5P0 b. 4.7P0 c. 5.0P0 d. 0.21P0 e. 0.43P0