A 1967 Kennedy half-dollar has a mass of 1.150 x 10-2 kg. The coin is a mixture

Question

A 1967 Kennedy half-dollar has a mass of 1.150 x 10-2 kg. The coin is a mixture of silver and copper, and in water weighs 0.1009 N. Determine the mass of silver in the coin. Give your answer to two significant figures.


A hand-pumped water gun is held level at a height of 0.69 m above the ground and fired. The water stream from the gun hits the ground a horizontal distance of 7.6 m from the muzzle. Find the gauge pressure of the water gun's reservoir at the instant when the gun is fired. Assume that the speed of the water in the reservoir is zero, and that the water flow is steady. Ignore both air resistance and the height difference between the reservoir and the muzzle.



A dump truck uses a hydraulic cylinder, as the drawing illustrates. When activated by the operator, a pump injects hydraulic oil into the cylinder at an absolute pressure of 2.81 x 106 Pa and drives the output plunger, which has a radius of 0.180 m. Assuming the plunger remains perpendicular to the floor of the load bed, find the torque that the plunger creates about the axis identified in the drawing.



Water is flowing down through the pipe shown in the drawing. Point A is 0.410 m higher than B. The speed of the water at A and B are vA = 5.00 m/s and vB = 1.64 m/s. Determine the difference PB - PA in pressures between B and A. The density of water is 1.00 × 103 kg/m3.

Explanation / Answer

Answer for the last problem. The height difference between the two points is, (hB - hA) = 0.410 m The speed of water at A, vA = 5 m/s The speed of water at B, vB = 1.64 m/s The density of water, = 1000 kg/m^3 From Bernoulli's theorm we have a formula for the pressure difference as PB - PA = (hB - hA)g + 0.5(vA^2 - vB^2)              = 4018 + 11155.2              = 15173.2 pa PLEASE POST EACH PROBLEM SEPARATELY. THANq

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