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Most of the motion generated by joints in the human body are examples of levers. An example of a third class lever is the forearm; the force which generates the motion is located in between the pivot point and the resistance force. The elbow acts as the pivot point, the biceps muscle pulls up on the forearm to move the mass which is held in the hand. Imagine you are holding an object in your hand with your forearm horizontal and your upper arm vertical so your elbow creates a 90° angle. If your biceps attach to your forearm 0.0597 m from the elbow and make an angle of 30.0° with the vertical while a 3.14 kg mass is held in your hand 29.03 cm from the elbow, what force is exerted by the biceps muscle? Ignore the mass of the forearm.
Ted Williams hits a baseball with an initial velocity of 120 miles per hour (176 ft/s) at an angle of ? = 35 degrees to the horizontal. what is the maximum height of the stadium
A 1.4 kg object at x= 2.00m, y = 3.10m moves at 3.96 m/s at an angle of 45 degrees north of east. Calculate the magnitude of the object's angular momentum
A soccer ball is kicked with an initial horizontal velocity of 18.0 m/s, find How far from where it was kicked will the ball land
At a given instant, a particle with a mass of 5.00 x 10^-3 kg and a charge of 3.50 x 10^-8 C has a velocity of magnitude 2.00 x 10^5 m/s in the +y direction. What is the magnitude and direction of the magnetic force on the particle
Two charged bodies exert a force of .145N on each other. If they are now moved so they are one fourth as far apart, what force is exerted.
A weight of 45.0 N is suspended from a spring that has a force constant of 180 N/m. Determine the maximum value of the driving force
The potential difference across a resting neuron in the human body is about 70 mV, How much power does the neuron release
A 120cm3 box contains helium at a pressure of 1.50atm and a temperature of 80.0?C. What is the final pressure in each box
After the collision (assumed elastic), the second ball is moving along the positive y axis. Elucidate the final direction of the first ball, and what are their two speeds?
A 10.0 g piece of clay is launched horizontally at 108-g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 148 N/m
A 38.0 kg child swings in a swing supported by two chains, each 3.04m long. The tension in each chain at the lowest point is 429N. Find out the child's speeds at the lowest point.
A small sphere of charge q1 = 0.872 µC hangs from the end of a spring. When another small sphere of charge q2 = -0.642 µC is held beneath the first sphere, the spring stretches by d = 3.57 cm from its original length.
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