Calendar: 1881-1882 Page 681

82 SCIENCE FREAKE SAMBROOKE IV -natural ijtlooopljp PART Describe Gravesande's apparatus for experimentally proving the truth of the Parallelogram of Forces stone weighing 30 lbs in water is attached to one end of rope and immersed in stream of water the other end of the rope being held by person on the bank The horizontal force of the stream against the stone is equal to 40 lbs Draw diagram showing the directions of the various forces acting on the stone and calculate the pull on the rope On what circumstances do the correctness and sensibility of balance depend In balance having unequal arms substance seems to weigh 25 ozs when placed in one pan and 16 when placed in the other The length of the longer arm of the balance is 20 inches find the length of the shorter arm How did Galileo attempt to prove that all bodies are equally affected in their fall by gravity stone is projected vertically upwards with velocity of 64 ft per second Find the time taken to reach the highest point the greatest height attained and the velocity of the stone after seconds Explain fully why the force of gravity diminishes as we pass from either Pole to the Equator Describe the experiments of Pascal and Torricelli with the barometer barometer of mercury stands at height of 29 inches Calculate the pressure of the atmosphere in lbs per square inch Describe the construction and explain the action of the ordinary double-barrelled air-pump Why is it impossible to obtain perfect vacuum with such pump PART II Define coefficient of linear expansion from heat bar of metal ft long and square inch section is heated from 20 to 80 find the increase of length section and