Which of the following has the shortest maximum span length before sag will occur? O a. softwood
b. particle board
c. plywood
d. hardwood

A1.5m wire carries a 2 a current when a potential difference of 52 v is applied. what is the resistance of the wire?

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

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