Mechanics | Relativity Answers

If P^Q=4i+3j+2k

Find the magnitude of PQ\ I.e[PQ]

(2) If A'=3i-j+2k and B' =2i+3j-K, find:

(1) A'×B'

(2) A'×(2A'+3B)

(3) A'.B'

A boy pulls a wooden box along a rough horizontal floor at constant speed by means of a force P. In the diagram f is the magnitude of the force of friction, N is the magnitude of the normal force, and Fg is the magnitude of the force of gravity. Express the relationship of these forces?

a single stage single acting air compressor has a bore of 125mm and a stroke of 115mm . the clearance volume is 70cm^3 with suction pressure of 1.0135 bar and 20 degrees celcius it delivers to a pressure of 5.2 bar at a speed of 105rpm. taking n=1.32,calculate the delivery in kg\min and the ip.

In an experiment to measure the acceleration g due to gravity, two values 9.96 ms-2, and 9.72 ms-2 are determined. Find(i) the percentage difference of the measurements, (ii) the percentage error of each measurement and(iii) the percentage error of their mean. (accepted value of g = 9.81 ms-2)

A slingshot is a child's toy that converts the strain energy of the stretched material into the moving energy of the propelled object. A boy pulls on his slingshot with a force of20 N and it extends by 7 cm. At what velocity does the 20 g stone fly off?

Raindrops fall vertically at 4m/s relative to the Earth. A train passenger observes the raindrops make an angle of 20 degrees to the vertical when the train is moving horizontally at constant speed. Calculate how fast the train is moving. Express your final answer in meters per second.