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A barber's chair with a person in it weighs 2100N. The output plunger of a hydraulic system begins to lift the chair when the barber's foot applies a force of 55N to the input piston. Neglect any height difference between the plunger and the piston. What is the ratio of the radius of the plunger to the radius of the piston?
A cylindrical copper rod of length 1.2 m and cross-sectional area 4.8 cm2 is insulated to prevent heat loss through its surface, Find the rate at which heat is transferred along the rod
A 3.5 k and a 1.5 k resistor are connected in parallel and this combination is connected in series with a 1.8 k resistor. If each resistor is rated at 1/2 W, what is the highest voltage that can be applied across the whole network.
An elevator can lift a 185 N aircraft a distance of 36 meters in 11 s. What is the power output of the elevator
A block of 4.4 kg is held at the top of a smooth incline. The incline has height of 2.1 m and is at an angle of 19 degrees above the horizontal. How much work was done by friction on the block
a 89.3 kg fullback running east with a speed of 4.92 ms is tackled by a 94.8 kg opponent running north with a speed of
Two bars of identical mass are at 32 °C. One is made from glass and the other from another substance. What is the specific heat capacity of the other substance
The nucleus of a hydrogen atom is a single proton. The radius of a proton is approximately 1 fm. What fraction of a hydrogen atom is occupied by the nucleus
Assume that you exhale the air at your body's temperature of 37 oC with relative humidity of 80%. Will you see your breath
The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 12-g nail
A steel wire of length 1.92 with circular cross section must stretch no more than 0.300 when a tensile (stretching) force of 410 is applied to each end of the wire. What minimum diameter is required for the wire
A 8.68x10^5-m- long pipeline has an inside diameter of 12 in. and can be supplied with oil at 35L/s (a) what is the volume of oil in the pipeline if it is full at some instant in time? (b) How long would it take to fill the pipleline with oil if it i..
A parallel plate capacitor has a charge of 2.66X 10^-11 C after being charged by a 15 V battery. The plates are seperated by 2.0 mm of air
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