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The patellar tendon attaches to the tibia at the tibial tuberosity. The tibial tuberosity is 7 cm from the center of the knee joint. The patellar tendon pulls at a 35 degree angle to tibia. If the patellar tendon produces an external torque around the knee joint equal to 400 Nm how large is the force?
an x-ray tube uses a 20000 volt difference to accelerate electrons across a 3cm gap between the plates of a parallel
The drawing shows two positive charges q1 and q2 fixed to a circle. At the center of the circle they produce a net electric field that is directed upward along the vertical axis. Decide the ratio q2/q1.
The overhead projector used in our lectures form (approximately) 2m-tall images of transparencies that are 30 cm tall. The screen is approximately 3m from the projector.Using these numbers, what must the focal length of the projector lens , in cm?
What was the change in velocity of the scooter.what mass may be placed 2 cm away from the other end of the bar to keep the bar horizontal.
You hold a spherical salad bowl 90 in front of your face with the bottom of the bowl facing you. The salad bowl is made of polished metal with the 30 radius of curvature. Where is the image of your 2.0 tall noses located.
A hot-air balloon is rising straight up with a speed of 2.78 m/s. A ballast bag is released from rest relative to the balloon when it is 2.15 m above the ground. How much time elapses before the ballast bag hits the ground?
A glass lens has a convex surface with radius 25.0 cm and a concave surface with a radius of 50.0 cm. The glass has index of refraction of 1.51. Calculate the focal length of this lens
An automobile traveling 100km/h overtakes a 1.50 km long traintraveling in the same direction on a track parallel to theroad. How far will the car have traveled in this time
“A standard bowling ball weighs 18 pounds. You wish to hold a bowling ball in front of you, with the elbow bent at a right angle. Suppose that your biceps attaches to your forearm at 2.5 cm out from the elbow joint, and that your biceps muscle pulls ..
Light enters a container of liquid at an angle of 42 degree to the normal; Evaluate the index of refraction of this liquid
A gasoline engine takes in1.61×104 {\rm J} of heat and delivers3900 {\rm J} of work per cycle. The heat isobtained by burning gasoline with a heat of combustion of4.60×104 {\rm J}/{\rm g}.
a car is traveling at 25 ms when the driver spots a large pothole in the road a distance of 30 m. ahead. she
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