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Superman leaps in front of Lois Lane to save her from a volley of bullets. In a 1-minute interval, an automatic weapon fires 156 bullets and each of mass is 8 gram at 360 m/s. The bullets strike his mighty chest, which has an area of 0.71 m2. Obtain the average force exerted on Superman chest if the bullets bounce back after an elastic, head-on collision.
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A 5.70-kg ball is dropped from a height of 12.0m above one end of a uniform bar that pivots at its center. The bar has mass 6.00kg and is 4.80m in length. At the other end of the bar sits another 5.10-kg ball, unattached to the bar. The dropped ball ..
Four identical charges (+2uC each) are brought from infinity and fixed to a straight line. The charges are located .4 m apart. Determine the electric potential energy of this group.
Playing near a road construction site, a child falls over a barrier and down onto a dirt slope that is angled downward at 42° to the horizontal, What is the coefficient of kinetic friction between the child and the slope
Water is at rest at the bottom of a well of depth h = 7.82 m. A pump lifts mass at a rate of dm/dt = 119 kg/minute from the well and ejects it with a speed v = 3.74. m/s. find P, the power (energy per time) needed to do this work
A 7.00-kg object undergoes an acceleration given by a with arrow = (3.00 i hat + 7.00 j hat) m/s2.
A 1.83 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.442 and the coefficient of kinetic friction is 0.240. How much force is needed to begin moving the book
A copper wire has radius r = 0.0245 cm, is 3.05 m long, has resistivity ρ = 1.72 · 10−8 Ω m, and carries a current of 0.360 A. The wire has density of charge carriers of 8.50 · 10^28 electrons/m^3.
A small jet that has passenger windows which are 30 cm by 36 cm is flying at a speed of 225 m/s. The pressure inside the plane is atmospheric pressure and the density of air in the plane is 1.29 kg/m3.
A basketball player makes a jump shot. The 0.607 kg ball is released at a height of 1.97 m above the floor with a speed of 7.22 m/s, What is the work done on the ball by air resistance
A police car has a 1000Hz siren. It is traveling at 35m/s on a day when the speed of sounds through air is 350m/s. What change of frequency does the observer hear
while in a third floor office building you notice a ball moving straight upward just outside the window. it takes 0.17
Explain why you are safe and unaffected inside a car that is struck by lightning. Also explain why it might not be safe to step out of the car just after the lightning strike, with one foot in the car and one on the ground.
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