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A 35 N hand and forearm are held at a 45 degree angle to the vertically oriented humerus. The CG of the forearm and hand is located at a distance of 15 cm from the joint center at the elbow, and the elbow flexor muscles attach at an average distance of 3 cm from the joint center. (Assume that the muscles attach at an angle of 45 degrees to the bones).
a.) how much force must be exerted by the forearm flexors to maintain this position?
b.) how much force must the forearm flexors exert if a 50 N weight is held in the hand at a distance along the arm of 25 cm?
A 10-cm-diameter cylinder of helium gas is 20 cm long and at 20°C. The pressure gauge reads 120 psi. how many helium atoms are in the cylinder? what is the mass of the helium?
find the time rocket reaches the peak height of trajectory.
An unfortunate subject receives doses of the following types of radiation: ? rays (20 mrad, RBE=1), electrons (45 mrad, RBE=1), What is the total biologically equivalent dose received
A 30.0g ball of clay traveling east at 1.00m/scollides and sticks together with a 30.0g ball of clay traveling north at 6.00m/s
Calculate the wavelength ?1 for gamma rays of frequency f1 = 6.40×10^-14 Now express this gamma-ray wavelength in nanometers
A 246 kg wooden raft floats on a lake. When a 80kg man stands on the raft, it sinks 4cm deeper into the water. When he steps off, the raft vibrates for a while.
An old hunting weapon was a rock on the end of a string. The hunter would swing the rock in horzontal circles and then throw it. If the rock had a mass of 2 kg and the 2 m long string breaks when the tension is 60N.
Multiple-Concept Example 1 discusses the concepts that are relevant to this problem. obtain the rise in its temperature
An armadillo and Earth attract each other gravitationally. Which experiences the greater gravitational force, or do they experience the same force magnitude?
Determine the magnitude and direction of impulse delivered to the ball by the floor.
find frequencies of vibration of the piano wire. Car 1 has 3 times the mass of car 2, but only 0.5 as much kinetic energy. What is the ratio between the speeds of the two cars (v1/v2)? You must type your answer as a numerical value.
A firefighter standing on a ladder 4.20 meters in the air is using a water hose to put out a fire. How much work is done per minute in lifting the water from the ground
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