3(b) A stationary car horn emits a sound wave of frequency 400 Hz. The wavelength of the wave is 0.85 m.
Calculate the speed of sound.
Speed of sound =?
m/s

(Total 3 marks)
Page 3 of 6
d7012021
F
1
a

What happens to light waves from a star as the star moves away from earth?

11. you want to calculate the displacement of an object thrown over a bridge. using -10 m/s2 for acceleration due to gravity, what would be the total displacement of the object if it took 8 seconds before hitting the water?

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.