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1. Someone shoots a gun while holding their arm stiffly outstretched in front of them and with the back of their shoulder braced against a wall. The bullet leaving the gun has a mass of 2.5 g and is traveling at 380 m/s (.22 caliber). It reaches this velocity (from rest) in 0.0001 s. Assuming that all of the recoil force is directed along the axis of the bones of the forearm, what is the stress in the arm bone? This of the arm as being one long bone, and the cross-sectional area of this bone is 3 cm2.
a. 6.8x109 dyn/cm2b. 4.0x109 dyn/cm2c. 9.4x108 dyn/cm2d. 3.2x109 dyn/cm2e. 7.2x108 dyn/cm2
2. Treat this problem with the simple pendulum in mind. A person pulls a bowling ball 0.5 m behind them and lets gravity cause it to swing forward. Just as the ball reaches the highest point in front of them, they let go. What does the ball's path look like after being released? (NOTE: no need to show work)
How far does the block move before coming to a stop - If momentum id conserved, where did the momentum of the block go?
q1. a spring with spring constant 12.5 hangs from the ceiling. a 400 ball is attached to spring and allowed to come to
An electric field of 120000 N/C points due west at a certain spot. What is the magnitude of force that acts on a charge of -7.8C at this spot.
consider a 300 mm x 300 mm window in an aircraft. for a temperature difference of 80degc from the inner to the outer
Two systems are formed from a converging lens and a diverging lens, as shown in parts a and b of the drawing. (The point labeled "Fconverging" is the focal point of the converging lens.) An object is placed inside the focal point of lens 1 at a dista..
A mass less spring with force constant k = 225 N/m is oriented horizontally and fixed on one end. What is the speed of the block after it leaves the spring
During a thunderstorm the electric field at a certain point in the earth's atmosphere is 1.11 105 N/C, directed upward, Find the acceleration of a small piece of ice of mass1.08 10-4 g
Suppose that you find the volume of all the oceans to be 1.4\times10^9\; \rm km^3 in a reference book. What is this volume in cubic meters
A massive steel cable drags a 25-kg block across a horizontal, frictionless surface. A 90.0 N force applied to the cable causes the block to reach a speed of 4.5m/s in 1.5s. What is the difference in tension between the two ends of cable.
The electric field caused by a certain point charge has a magnitude of 6800N/C at a distance of 0.200m from the charge
a two-resistor voltage divider employing a 3.3-kq and a 6.8-kq resistor is connected to a 9-v ground-referenced power
A firecracker resting on a level street explodes into three pieces of equal mass. Immediately after the explosion, the first piece is moving north at 125 m/s, and the second piece is moving east at 75.0 m/sec. What is the velocity of the third piece ..
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