The condition for rolling without slipping is that the center of mass speed is
A) Vcm= r ?2
B) Vcm = 2 r ?
C) Vcm = r ? / 2
D) Vcm = r ?
E) Vcm = r2 ?
D
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An electromagnetic wave has a peak electric field of 3.0 kV/m. What is the intensity of the wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 24 kW/m2 B) 12 kW/m2 C) 8.0 kW/m2 D) 4.0 kW/m2
Which of the following materials has the largest conductivity (at 20°C)?
A) copper B) platinum C) silver D) iron E) glass
You push downward on a box at an angle 25° below the horizontal with a force of 750 N. If the box is on a flat horizontal surface for which the coefficient of static friction with the box is 0.76,
what is the mass of the heaviest box you will be able to move? A) 59 kg B) 68 kg C) 54 kg D) 82 kg
In a ______________the atoms are in regular arrangements.
Fill in the blank(s) with the appropriate word(s).