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“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 vertically upward, that is, it acts at right angles to the forearm. Also assume that the ball is held 38 cm out from the elbow joint. Let the mass of your forearm be 4.6 kg and suppose its center of gravity is located 19cm out from the elbow joint. How much force should your biceps muscle apply to forearm in order to hold out the bowling ball at the desired angle?
Radon is a radioactive gas, commonly found in the basement of ahouse. It has a half- life of 3.8 days. What is the decay constant of radon
Water flows over a waterfall 10 meters to a turbine. Water flows at a rate of 10kg/sec. How much power is delivered to the turbine
A block "A" of mass 3 kg on the table is connected to another block "B" of mass 2 kg hanging beneath by a string of negligible mass which passes through the hole. Calculate the unknown angular speed
A star is moving away from the Earth at the speed of 200 km/s. What will be the wavelength of a spectral line that would have the wavelength of 500 nm if the star were at rest.
the electric field between the plates of a parallel-plate capacitor is horizontal uniform and has a magnitude e. a
A ball thrown straight up from the ground passes a window 5.6 m up. An observer looking out the window sees the ball pass the window again, going down, 2.6s later
The electric field on the surface of a 11 cm diameter sphere is perpendicular to the sphere and has a magnitude 51 kN/C. What is the electric flux through the sphere
a simple harmonic oscillator consists of a 100 g mass attached to a spring whose force constant is 104 dyne cm. the
the sun emits light waves with a power of 4x1026 watts. determine the intensity of light waves from the sun just
Two ice skaters, Daniel (mass 70.0 ) and Rebecca (mass 45.0 ), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, What is the magnitude of Daniel's velocity after the collision
a particles have charges q1 -q2 450 nc and q3 -q4 95 nc and distance a 5.8 cm. what are the a x and b y components
In the operating room, anesthesiologists use mass spectrometers tomonitor the respiratory gases of patients undergoing surgery. Onegas that is often monitored is the anesthetic isoflurane (molecularmass = 3.06 x 10-25 kg). In a spectrometer, a sin..
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