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Imagine the motion of the human forearm in throwing a dart. Because of the force M applied by the triceps muscle, the forearm can rotate regarding an axis at the elbow joint. Suppose that the forearm has the dimensions 0.28m from axis of elbow to dart pin and 0.025m from axis of elbow to muscle. The moment of inertia is 0.065kg/m2 (including the effect of the dart)relative to the axis at the elbow. Suppose also that the force M acts perpendicular to the forearm. Ignoring the effect of gravity and any frictional forces, Decide the magnitude of the force M needed to give the dart tangential speed of 5.0 m/s in 0.10s, starting from rest.
A bicyclist is finishing his repair of a flat tire when a friend rides by with a constant speed of 3.27 m/s. What is his speed when he catches up
A Federation starship ( 2.20×10^6kg ) uses its tractor beam to pull a shuttlecraft ( 2.20×10^4kg ) aboard from a distance of 12.0km away. The tractor beam exerts a constant force of 4.0×104N on the shuttlecraft. Both spacecraft are initially at..
As a bacterium swims through water it propels itself with its flagella so as to overcome the frictional drag forces and move at, more or less, constant velocity of 100 micrometers/s for periods of time. If the frictional drag force on a bacterium is ..
Light passes from medium A into medium B at an angle of incidence of 44 degrees. The index of refraction for A is 1.25 times that of B. What is the angle of refraction? Express your answer using two important figures. What is the ratio of the speed o..
One solenoid is centered inside another. The outer one has a length of 48.0cm and contains 6600 coils, What is the mutual inductance of these solenoids
Suppose that two objects attract each other with a gravitational force of 16 units. If the distance between the two objects is doubled, what is the new force of attraction between the two objects
A laser beam aimed from the earth is swept across the face of the moon. at what speed does the laser light move across the moon's surface
ccccthe Zambesi river in Africa rushes over Victoria Falls at a rate of 25 x 10^6 gallons per minute. The falls are 108 m high, 1 gallon equals 3.785 x 10^-3 m^3 (or 0.1337 cubic foot), and the water has a density of 1.00 x 10^3 kg/m3 (each cubic foo..
A girl rides an escalator that moves her upward at a constant speed. As the girl rises, how do her gravitational energy and kinetic energy change.
A 11.2 kg object oscillates at the end of a vertical spring that has a spring constant of 1.90 104 N/m. Calculate the frequency of the dampened oscillation
The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. determine the recovery time (in hours) of the unit
A 3.80-mm-wide bolt is viewed with a9.30-cm-focal-length lens. A normal eye views the image at its near point. Calculate the angular magnification
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