Aluminum rivets used in airplane construction are made slightly too large for the rivet boles to be sure of a tight fit. the rivets are cooled with dry ice (−78.5∘c) before they are driven into the holes. if the holes have a diameter of 0.6350 cm at
20.5∘c , what should be the diameter of the rivers at 20.5∘c if they are to just fit when cooled to the temperature of dry ice?

69. air frictionthe velocity of the satellitea. decreases b. increases c. sometimes increases sometimedecreases d. no effect at all70. the unit of gravitational potential energy isa.jouté b.watt c. newtond.pascal71. which of the following is not influenced by a magneta. cobalt b.copper c.irond. nickel72. one joule of work done in one second by unit positive chargea.1 watt b.1 volt c.1 js d. none73. the most deviated colour of light after passing through a prisea. violet b.red c. green d.yellow4. a coin is placed below a beaker fill with water upto 12 cm isdisplaced by water isa. 9cm b.6cmс.3cmd.7cm