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Rodney weighs 160 lb. He sits in a comfortable chair in which 90% of his weight is supported by his rear end and upper thighs and 10% by his feet. If the contact area of his buttocks and thighs against the seat is 150 square inches, what is the average pressure over this area (in both pounds per square inch and pascals)?
A hypodermic syringe contains a medicine with the density of water. The barrel of the syringe has a cross-sectional area A = 2.60 10-5 m2, and the needle has a cross-sectional area a = 1.00 10-8 m2. In the absence of a force on the plunger, the pr..
A string 0.5 m long with mass density 0.0003 kg/m and is vibrating 200 cycles per second. What hanging mass would produce this tension
The attractive electrostatic force between the point charges 7.14×10?6 and has a magnitude of 0.825, find the sign and magnitude of the charge Q
A 400 ohm resistor and a 6.00 uf capacitor are connected in parallel to and AC generator that supplies a voltage of amplitude 310 V at an angular frequency 57.3 Hz. Find the current amplitude in the resistor.
A meter stick is suspended from one end (I = 1/3 mL^2) and oscillates freely with small amplitude. Find the length of a simple pendulum that would have the same period of oscillation as the meter stick.
An initially motionless car of mass 1000kg slides down from a height on a frictionless roller coaster track. What was the minimum height from which it was released
Elements that appear in the same column of the periodic table often share similar chemical properties. In the case of the alkaline earth metals, this is troublesome since the body treats calcium, calculate the path radius of the Ca ion
A 21.8-kg box rests on a frictionless ramp with a 15.7° slope, what is the smallest force F the mover will have to exert to move the box up the ramp
A hydraulic lift in a garage has two pistons: a small one of cross-sectional area 3.60cm2, If this lift is designed to raise a 3300-kg car, what minimum force must be applied to the small piston
A flower pot on a balcony railing falls to the ground 8.63m below. A cat directly beneath the pot sees it begin to fall. How long does cat have to move.
Lightning strikes a point on earth, delivering 20.0 C of charge from cloud to earth across a potential difference of 1.00 108 V. How much energy is delivered to the ground
A 64-kg man standing on a scale in an elevator notes that the elevator rises, the scale reads 827 N. What is the acceleration of the elevator
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