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High-impact activities such as jogging can cause considerable damage to the cartilage at the knee joints. Peak loads on each knee can be eight times body weight during jogging. The bones at the knee are separated by cartilage called the medial and lateral meniscus. Although it varies considerably, the force at impact acts over approximately 11.0 cm^2 of this cartilage. Human cartilage has a Young's modulus of about 25.0 MPa (although that also varies). By what percent does the peak load impact of jogging compress the knee cartilage of a 72.0 kg person? What would be the percentage for a lower-impact activity, such as power walking, for which the peak load is about four times body weight.
Two blocks with masses m = 16.7 kg and M = 70.1 kg are not attached. The coefficient of static friction between the blocks is 0.45 but the surface beneath M is frictionless. What is the minimum force F required to hold m against M?
The eyepiece of a compound microscope has a focal length of 2.60 cm , and the objective lens has = 0.760 cm. calculate the distance between the lenses when the microscope is adjusted for a relaxed eye
A spring with constant k = 40 N/m is at the base of africtionless, 30.0 degree-inclined plane. how far along the incline will it travel before it stops
A photon is scattered 60.0° during a collision with an electron, which is initially at rest and gains a speed of 6.00× 106 m/s during the collision
A stone is dropped from the roof of a building; 1.30s after that, a second stone is thrown straight down with an initial speed of 23.0m/s , How long did it take the first stone to reach the ground
Diagnostic ultrasound of frequency 4.50 MHz is used to examine tumors in soft tissue. What is the wavelength in air of such a sound wave
A merry-go-round with, radius 3 m rotates freely with an angular speed of 2/pi rev/s. Its kinetic energy is 4000 J. What is the final angular speed of the merry-go-round and the person after the person jumps on
A transformer has 3,840 turns in the secondary. Calculate the output voltage and the number of the number ofturns of the primary
A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. What is the average power radiated by the source
a pitcher delivers a fast ball with a velocity of 43 m/s to the south. the batter hits the ball and gives it a velocity of 51 m/s to the north. what was the average acceleration of the ball
The value of F B. ds along closed path in a magnetic field is given by 6.28 X 10 T.m. What is the total current that passes througn this closed path?
q1. a 35.0-kg child swings in a swing supported by two chains each 2.90 m long. the tension in each chain at the lowest
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