(b) A specimen of an alloy of silver and gold, whose densities 10.50 and 18:90g/eme respectively, weighs 35.20g in air
and 33.13 g in water. Find the composition, by mass of the
alloy,
assuming that there has been no volence change in the
preess of prodhing the alloy.​

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.