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A person lifts a 100 Newton dumbbell by pulling upward with his biceps. The biceps are attached to the arm bone 1.5 cm from the elbow. The 100 N weight is 30 cm from the elbow. The forearm has a weight of 40 N and a center mass of 14 cm from the elbow. Assume all the angles are square for this problem. How much force is required to lift the elbow and the forearm?
An ideal monatomic gas expands isothermally from 0.500 m3 to 1.25 m3 at a constant temperature of 630 K, Find the thermal energy transfer Q
A toy train rolls around a horizontal 1.8-{\rm m}-diameter track. The coefficient of rolling friction is 0.14. What is the magnitude of the train's angular acceleration after it is released?
6 - two equal masses of charge 36 nC each are suspended at the end of two 1-m strings of negligible mass, The ropes make and angle of 5 with respect to each other
A large tank of water is full and has a depth of 10.0 m. What is the pressure at the bottom of the tank
An ice skater is gliding horizontally across the ice with an initial velocity of +6.93 m/s. How much time elapses before her velocity is reduced to +2.95 m/s
A snowboarder starts from rest and rides 39.47 m down a snow-covered slope that makes an angle of 33.19° with the horizontal, How far will she travel along the flat snow
A nearsighted person wears glasses to correct the problem. How far from the eyes is the person's far point located
A 66 KG trampoline artist jumps vertcally upward from the top of a platform with a speed of 5.4 m/.s. A) What is his speed as he lands on the trampoline, 3 m below his jump off point? B) If the trampoline behaves like a spring with spring stiffnes..
Most string theory compactifications analyzed therefore far have as backgrounds a conformal field theory corresponding to a nonlinear sigma model with a Calabi-Yau target space, or some relatively classical background, possibly with orb folding.
Two point charges q units each placed 2 m apart exert a force the f 20 N on eaother. What will be the force between them if third charge -q units is placed at the mid point of the link be joining the two charges?
A heart defibrillator delivering 400 J of energy by discharging a capacitor initially at 10,000 V has a capacitance of 8.00 µF, What is the voltage of the second defibrillator
A stone is thrown horizontally at a speed of 4.9 m/s from the top of a cliff 89.5 m high, how long does it take the stone to reach the bottom of the cliff.
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