In the stream, water waves bunched up as the water flowed by. As we
moved the disturbance up stream, the water bunched up even more. An
airplane can travel at the same speed as sound does, about 340 m/s.
When it does, is it logical that the airplane would experience a wave wall
barrier, ie, a sound barrier?
O yes
O No

Give an example in which the electrical energy changes to light energy

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

What surface does the epithelial tissue cover? a. the surface of the body b. lines internal organs c. forms many glands d. all of the above