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As a person walks, the femur (upper leg bone) slides in a socket in the hip. This socket contains cartilage and synovial fluid, giving it a low coefficient of friction. Consider a 68kg person walking on a horizontal sidewalk. Typically, both legs together comprise 34.5% of a person's weight.
Part A Find the frictional force on the bone in the hip joint. Assume ? =0.003.
Part B If this person were walking on the Moon, where g = 1.67 m/s2, what would be the frictional force at the hip joint?
Part C With age or with osteoarthritis, the synovial fluid can dry up, resulting in a much higher coefficient of friction. If this coefficient increases 100-fold (which can happen), what would be the frictional force (on Earth)?
It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. Find out the angular speed of the wheel at t = 2.30 s.
A block has an initial speed V(o) > 0 on a linear trajectory on the surface with friction coefficient u and air resistance (F = cv^2). Derive an equation that will represent the velocity (V) as a function of the position of the block (x). So V(x).
Assume that the volume of the empty spaces between the candes is negligible. If the height of the candes in the container increases at the rate of 0.270 cm/s, at what rate (kilograms per minute) does the mass of the candies in the container increa..
A diverging lens (f = -12 cm) is located 20.0 cm to the left of a converging lens (f = 34.5 cm). A 3.00 cm tall object stands to the left of the diverging lens, exactly at its focal point.
Car A uses tires for which the coefficient of static friction is 1.1 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 25 m/s. Car B uses tires for which the coefficient of static friction is 0.65 on the s..
Compute the average number of ion pairs produced along the entire paths of 12.0 MeV electrons that are brought to rest in air. Would number of ion pairs produced in soft tissue be significantly different.
An 850g- iron block is heated to 370C and placed in an insulated container (of negligible heat capacity) containing 41.0g of water at 23.0C a).What is the equilibrium temperature of this system? The average specific heat of iron over this temperat..
Illustrate what is the magnitude of the apparent weight of a 78kg astronaut 5200km from the center of the Earth's moon in a space vehicle moving at constant velocity?
The donor paid gift tax of $14,000 on the transfer. If Laura later sells the property for $110,000, illustrate what is her recognized gain or loss?
suppose that they have same internal energy, which will have a higher temperature: a metal knife in thermal equilibrim with a hot griddle or a 1kg block of ice at -25C or seven 12g ice cubes at -25C.
A hollow sphere is rolling along a horizontal floor at 7.0 m/s when it comes to a 39^circ incline. How far does it go up the incline before coming to a stop and roll back down.
A dentist uses a small mirror of radius 44mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 13 mm from the tooth, what is magnification of the image.
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