Compared with the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is
A) relatively small.
B) equally huge.
C) not enough information
Answer: B
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Photon Momentum: What is the momentum of a photon of light that has a wavelength of 480 nm? (h = 6.626 × 10-34 J ? s)
A. 1.1 × 1027 kg?m/s B. 2.2 × 1027 kg?m/s C. 1.8 × 1027 kg?m/s D. 1.4 × 1027 kg?m/s E. 2.0 × 1027 kg?m/s
Work is done
A. By the component of the force parallel to the displacement B. Only if the entire force is parallel to the displacement C. By the component of the force perpendicular to the displacement D. By all forces
A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is
A) 10%. B) 20%. C) 50%. D) 80%. E) need more information
The switch is closed in the figure below. After a long time compared with the time constant of the circuit, what will the current be in the 2-V resistor?