What type of boson is responsible for the electromagnetic force?
a) gluon
b) photon
c) electron
d) graviton
e) W boson
Ans: b) photon
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A. 0.33 kcal/kg ? C° B. 0.75 kcal/kg ? C° C. 1.3 kcal/kg ? C° D. 7.5 kcal/kg ? C°
A 7.5 × 1014 Hz laser emits a 7.7-?s pulse, 5.0 mm in diameter, with a beam energy density of 0.51 J/m3. What is the amplitude of the electric field of the emitted waves? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
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A ball vibrates back and forth from the free end of an ideal spring having a force constant (spring constant) of 20 N/m
If the amplitude of this motion is 0.30 m, what is the kinetic energy of the ball when it is 0.30 m from its equilibrium position? A) 0.45 J B) 0.90 J C) 0.22 J D) 0.00 J E) 1.4 J
A 10-g bullet moving horizontally with a speed of 2.0 km/s strikes and passes through a 4.0-kg block moving with a speed of 4.2 m/s in the opposite direction on a horizontal frictionless surface. If the block is brought to rest by the collision, what is the kinetic energy of the bullet as it emerges from the block?
a. 0.51 kJ b. 0.29 kJ c. 0.80 kJ d. 0.13 kJ e. 20 kJ