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Q. Comic-book superheroes are sometimes able to punch holes through steel walls.
(a) If the ultimate shear strength of steel is taken to be 2.50x 10^9 Pa, what force is required to punch through a steel plate 2.2cm thick? Assume the superhero's fist has cross-sectional area of 8.00x 10^1 cm2 and is approximately circular.
Your response differs significantly from the correct reply. Rework your solution from the beginning and check each step carefully.
(b) qualitatively, what would take place to the superhero on delivery of the punch? What physical law applies?
A car drives straight off the edge of a cliff that is 64-m high. The police at the scene of the accident note that the point of impact is 110-m from the base of the cliff. How fast was the car travelling while it went over the cliff.
A stand, string, a paper or plastic cup, a nail, a roll of paper towels or similar sized paper, coloured sand, or some other dry powdery product, and a ruler or measuring tape.
A cart of mass 6.8 kg is moving with a velocity of 15.2 m/s. It makes a head-on perfectly inelastic collision with a stationary cart B with mass 6.4 kg causing them to travel with the velocity 7.63 m/s. What is the velocity of cart B.
A child goes down a playground slide with an acceleration of 1.20 m/s2. Compute the coefficient of kinetic friction between child and slide if the slide is inclined at an angle of 32.2° below the horizontal.
When the projectile is at the top of its trajectory, an internal explosion causes it to separate into two fragments of equal mass. One of the fragments falls straight downward as though it had been free from rest.
From the shape of total energy vs. time plot, what can you conclude about the conservation of mechanical energy in your mass and spring system.
A rock of mass m = 1.0 kg is tied to a string of length L = 1.9 m and is twirled in a vertical circle. The speed v of the rock is constant; that is, it is the same at the top and the bottom of the circle. If the tension in the string is zero when the..
cientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 5.0kg projectile from rest to a speed of 4.0 x 103 m/s. The net force accelerating the projectile..
An ideal monatomic gas expands adiabatically from an initial temperature of 368 K and volume of 4.6 m3 to a final volume of 11 m3. If the initial pressure is 1.5 multiplied by Patm, how much work is completed on the gas.
A typical person radiates about 62 W of power at room temperature. Given this result, how long does it take for a person to radiate away the energy obtained by consuming a 230-calorie doughnut.
Calculate the coil's self-inductance. If the current decreases uniformly from 5.00 to 2.00 in 3.00, estimate the self-induced emf in the coil.
An object consists of a ball of weight W glued to the end of a uniform bar also of weight W. if you release it from rest, with the bar horizontal.
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