A proton with mass 1.67 × 10^-27 kg moves in an accelerator with speed of 0.900c. What is its kinetic energy? (c = 3.00 × 10^8 m/s)
a. 1.95 × 10^-10 J
c. 3.70 × 10^-10 J
b. 1.00 × 10^-10 J
d. 1.35 × 10^-10 J
A
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A) tidal forces from Jupiter B) tidal forces from the Sun C) the competing gravitational tugs of Mars and Jupiter D) orbital resonances with Jupiter
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A 50.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300 and the coefficient of kinetic friction is 0.200
What is the friction force on the box if (a) a horizontal 140-N push is applied to it? (b) a horizontal 175-N push is applied to it?