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If you jump from a desktop and land stiff-legged on a concrete floor, you run a significant risk that you will break a leg. To see how that happens, consider the average force stopping your body when you drop from rest from a height of 0.80 m and stop in a much shorter distance d. Your leg is likely to break at the point where the cross-sectional area of the bone (the tibia) is smallest. This point is just above the ankle, where the cross-sectional area of one bone is about 1.60 cm2.
A bone will fracture when the compressive stress on it exceeds about 1.60 x i08 N/rn2. If you land on both legs, the maximum force that your ankles can safely exert on the rest of your body is then about the following. 2(1.60 x 10^8 N/m^2)(1.60 x 10^-4 m^2) = 5.12 x10^4 N Calculate the minimum stopping distance d that will not result in a broken leg if your mass is 50.0 kg.
At the Indianapolis 500, you can measure the speed of carsjust by listening to the difference in pitch of the engine noisebetween approaching and receding cars. How fast is it going
What is the fundamental minimum uncertainty in a dimension of the position of the electron in the previous problem if its momentum is simultaneously deliberate to a precision of plus or minus one percent (two percent total)?
Four point charges of magnitude 3.9 µC are at the corners of a square of side 3 m. Find the electrostatic potential energy if all the charges are negative
An amusement park ride called the Rotor consists of a room in the shape of a vertical cylinder (1.90 m in radius) which, once the riders are inside, begins to rotate, forcing them to the wall. When
Find what is the distance between the common center of the diffraction patterns and the first occurrence of the spot where a dark fringe from one pattern falls on top of a dark fringe from the other pattern
A string length 2.0 m and linear mass density 25.0 mg/m vibrates at a fundamental frequency of 450.0 Hz. What is the speed of the transverse strin waves
an isolated quantity of an ideal gas at 290.9 k has a volume of 12.97 l at a pressure of 1.84 atm. what is the pressure
an unstable particle called the pion has a mean lifetime of 25 ns in its own rest frame. a beam of pions travels
an isolated conducting sphere has a 9 cm radius. one wire carries a current of 1.000 002 0 a into it. another wire
Two identical +45.3 nC point charges A and B, with masses of 3.0*10^-9 kg each, are fixed in place with a distance of 2.54 cm between them. Calculate the speed of charge B when it has reached a distance of 3.68 cm away from charge A
When cars are equipped with flexible bumpers, they will bounce off each other during low-speed collisions, thus causing less damage. Find the speed of the lighter car just after the collision
A block of mass m1 = 17 kg slides along a horizontal surface (with friction, μk = 0.49) a distance d = 2.45 m before striking a second block of mass m2 = 7.5 kg. How far does block 2 travel, d2, in meters, before coming to rest
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