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1) A student pushes on a swinging door to leave a class. How much torque is exerted in each of the following cases if the force exerted is 50 N?
A - The student pushes perpendicular to the door at the end farthest from the hinges (a distance of 80 cm).
B - The student pushes at an angle of 60 degrees to the door at the end farthest from the hinges.
C - The student pushes perpendicular to the door at the end where hinges are located.
2) How much tension does your bicep exert in order to support your forearm held out horizontally if the weight of your forearm is 12N? Assume the centre of mass of your lower arm is located 15 cm from the elbow joint and the bicep is located 5 cm from the elbow joint.
3) How much tension does your bicep exert to support not only your arm, but also a 12N weight in your hand? Assume the weight is located 20 cm from the centre of mass of the lower arm.
A 7.0 kg sled is initially at rest on a horizontal road. The coefficient of kinetic friction between the sled and the road is 0.40. Find the work done by the applied force
A Van de Graaff generator is utilized to demonstrate the effects of high potential. The device has a radius of 29.5cm and stands in air. What is its maximum potential? How much charge does the dome hold at its maximum potential?
Aircraft carrier and airplane are located 500km apart on a bearing of 48° as measured from aircraft carrier. What will be the bearing from the aircraft carrier to the airplane
Two rigid rods are oriented parallel to each other and to the ground. The rods carry the same current in the same direction. Determine the current in the rods
A 2.00 kg stone is tied to a thin, light wire wrapped around the outer edge of the uniform 10.0kg cylindrical pulley shown in the figure below. Find the acceleration of the stone
It takes 2.66 milliseconds for the current in an LR circuit to increase from zero to 0.80 its maximum value. Find the time constant of the circuit
You have a pulley 11.8 cm in diameter and with a mass of 1.6 kg. You get to wondering whether the pulley is uniform. What is the moment of inertia if the pulley is uniform
A 96-kg man's thighbone has a relaxed length of 0.56 m, a cross-sectional area of 6.7 10-4 m2, By how much does the thighbone compress when the man is standing on both feet
A 1.02 kg mass is suspended from a wire changes the length of the wire by 1.20 mm. find the stress in the wire due to the suspended mass
A constant force is applied to an object, causing the object to accelerate at 10 m/s2. What will the acceleration be if the force is halved? What will the acceleration be if the object's mass is halved?
In a certain binary-star system, each star has the a mass of1.00 x 1030 kg, What is their period of revolution in Earth years
A grating has 600 rulings/mm and is 5.0mm wide, How many higher orders of maxima can be seen
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