A non-uniform rod XY of mass 40 kg and length 5.0 m lines on the horizontal ground. Its centre of gravity is 2.0 metres from the end X .Calculate the vertical Force P that will just be sufficient to lift the end Y from the ground. Why would the force P, is applied at the end X not be sufficient to lift the end X from the ground? (g=10.0 ms^-2)

-a plank XY 3.0m long weighing 20 kg and with its centre of gravity 2.0m from the end A carries a load mass 10 kg at the end A. It rests on two support at C and D.

a)Compute the values of the reaction forces R1 R2 at C and D.

b) How far from D ,and on which side of it must the mass of 24 kg placed on the plank so as to make the reactions equal ? ,What are their values.

c)Without this 24kg ,what vertical Force applied at we will just leave the plank clear of D? What is then the reaction at C?

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?

What can you increase the strength of an electromagnet by