An airplane with a wingspan of 60.0 m flies parallel to the Earth's surface at a point where the downward component of the Earth's magnetic field is 0.400 l0-4 T. If the induced potential between wingtips is 0.600 V, what is the plane's speed?
a. 338 m/s
c. 250 m/s
b. 375 m/s
d. 417 m/s
[Ques. 2] Suppose a 0.30-kg mass on a spring that has been compressed 0.10 m has elastic potential energy of 1.5 J. What is the spring constant?
a. 10 N/m
c. 200 N/m
b. 20 N/m
d. 300 N/m
[Ques. 3] A 0.200-m wire is moved parallel to a 0.500-T magnetic field at a speed of 6.00 m/s. What emf is induced across the ends of the wire?
a. 1.00 V
c. 2.25 V
b. 0.600 V
d. zero
[Ques. 4] The oxygen molecule (O2) may be regarded as two masses connected by a spring. In vibrational motion, each oxygen atom alternately approaches, then moves away from the center of mass of the system. If each oxygen atom of mass m = 2.67 10-26 kg has a vibrational energy of 6.4 10-21 J and the effective spring constant is 50 N/m, then what is the amplitude of oscillation of each oxygen atom?
a. 3.2 10-11 m
c. 1.1 10-11 m
b. 1.6 10-11 m
d. 8.0 10-12 m
[Ques. 5] A sensitive ammeter is connected to a wire loop and placed within the magnetic field of a strong horseshoe magnet. The ammeter shows a deflection when:
a. the wire is moved parallel to the field. b. neither wire nor magnet is moving.
c. the wire's axis is parallel to the field. d. the wire is moved perpendicularly to the field.
[Ques. 6] A 0.20-kg block rests on a frictionless, level surface and is attached to a horizontally aligned spring with a spring constant of 80 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. A frictional force of 0.3 N exists between the block and surface. What is the speed of the block when it passes through the equilibrium point after being released from the 4.0-cm displacement point?
a. 0.45 m/s
c. 0.72 m/s
b. 0.63 m/s
d. 1.2 m/s
[Ques. 7] The units Tm2/s are equivalent to:
a. V.
c. W.
b. N/m.
d. webers.
[Ques. 8] A 0.20-kg block rests on a frictionless, level surface and is attached to a horizontally aligned spring with a spring constant of 80 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. What is the speed of the block when it passes through the equilibrium point?
a. 2.1 m/s
c. 0.80 m/s
b. 1.6 m/s
d. 0.57 m/s
[Ques. 9] A coil is placed in a magnetic field and has a flux FB through it. The coil is stressed so that its area reduces to 60 of its original value. If the plane of the coil stays the same and the flux through it remains the same, how must the magnetic field change?
a. It must increase by 60.
c. It must decrease by 40.
b. It must increase by 120.
d. It must increase by 67.
[Ques. 10] A 0.20-kg mass is oscillating on a spring over a horizontal, frictionless surface. When it is at a displacement of 2.6 cm from equilibrium, it has a kinetic energy of 2.7 J and a spring potential energy of 2.2 J. What is the maximum speed of the mass during its oscillation?
a. 3.7 m/s
c. 6.0 m/s
b. 4.7 m/s
d. 7.0 m/s
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