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Dan’s biceps muscle has a moment arm about the elbow joint of 0.029 m when the joint is held at a joint angle of 90 degrees and can produce a force of 615 N. His forearm is 0.21 m from the elbow joint center to the center of his hand where he grips a handle. His forearm has a mass of 1.2 kg and the center of mass is located directly above the elbow joint. How much force (magnitude only) can he deliver to the handle with force from his biceps?
A ball is released from rest and rolls down an incline plane, requiring 4 sec to cover a distance of 100cm down the plane, How far did it travel vertically while rolling down the olane
A geostationary communications satellite orbits the earth directly above the equator at an altitude of 35,800 km. Calculate the time it takes for a signal to travel from a point on the equator to the satellite
question two toroidal solenoids are wound around the same form so that the magnetic field of one passes through the
Consider the driven, damped harmonic oscillaror discussed. (a) Calculate the power dissipated by the damping force. (b) Calculate the average power loss, using the fact that the average of sin2( ?t+?) over a cycle is one-half.
A power supply that provides a voltage of 30.0V·sin(317·t), where t is in seconds, is connectedacross a resistor R = 199 W. Calculate the average power dissipated in the resistor
A 5 kg mass attached to a horizontal spring is pulled from its equilibrium position by 2 m and let go. what is the maximum velocity of the mass
A 300 turn solenoid with a length of 35cm and a diameter of 10cm carries a current of 0.234A. What is the speed of the electron
What is the potential energy of a comet of mass m around a star of mass M if it is in elliptical orbit that has a pericenter at a distance R and an apocenter at 4R? What is the total energy of the comet?
A rocket is launched at an angle of 56.0° above the horizontal with the initial speed of 101 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 28.0 m/s2. At this time, its engines fail and the rocket proceeds..
Spiderman's webbing has a cross sectional area of A = 10^-6 m^2. The Young's modulus of the silk is Y = 200 x 10^10 Pa, and has a breaking strength of 1 x 10^9 Pa. How far will it have stretched before breaking
How long must a 0.60-mm-diameter copper wire be to carrya 0.50 {\rm A} current when connectedto the terminals of a 1.5 {\rm V} flashligh tbattery? What is the current if the wire is half the length inpart A?
An electric motor operates a pump that irrigates a farmer’s crop by pumping 10 000 L of water a vertical distance of 8.0 m into a field each hour. The motor has an operating resistance of 22.0\Omega and is connected across a 110-V source.
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