When a nucleus emits a beta particle, its atomic number
A) increases by 1.
B) decreases by 1.
C) increases by 2.
D) decreases by 2.
E) none of the above
Answer: A
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A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s. What average force of air friction was exerted on the stone as it fell?
A) 4.1 N B) 2.9 N C) 0.13 kN D) 7.2 N E) 1.2 N
A rectangular coil (0.20 m × 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.080 N / m. What is the current in the coil?
a. 5.0 mA b. 1.7 A c. 8.3 mA d. 1.0 A e. 42 mA
A ray of light traveling in a calm pond strikes the surface at an angle of incidence which is 2° larger than the critical angle. This ray will
A. be refracted toward the normal to the surface in the air. B. undergo total internal reflection and not enter the air at all. C. be refracted away from the normal to the surface in the air.
If an equivalent amount of work is done in a shorter period of time
A. more power is required B. the same amount of power is required C. less power is required