Calendar: 1881-1882 Page 662

APPLIED SCIENCES 663 inches in diameter find the distance of the centre of gravity of the combination from the end of the first cylinder Two walls of brickwork foot thick and 20 feet high were employed to sustain roof having pitch of 60 and whose weight per square foot was equal to 20 lbs when the structure was found to be so insecure as to be on the point of falling What distance were the walls from each other rectangular mass of cast iron rests on an inclined plane of oak its base is feet square and its height 308 feet and it is on the point of both sliding down and overturning Find from these data the coefficient of friction between cast iron and oak body whose mass is 10 lbs is projected downward with velocity of 320 feet per second and at the same instant another Β of the same mass is projected upward with an equal velocity determine how much faster is moving than at the end of seconds and the greatest height attained by What amount of energy is accumulated in each of these bodies at starting An inclined plane is being driven in between fixed block and block Ε which moves between guides Find the relation between the power at the back of the inclined Ε plane and the resistance offered by taking into account only the friction on the inclined face Hence find the relation between the power and weight on rough screw