- 9. A plone that can travel at 200km/h in still air heads directly South. However, a wind comes from the West (towards the East) and blow it off course. If the angle of the plane's final volocity is 6.50^circ E of S, then determine: ii) the wind speed b) how far the plane travels in 3 .00 hours
- 3. A75.0 kg diver standing on a diving platform has a gravitational potential energy of 7.36times 10^3J What is the vertical height of the diving platform? (2 marks)
- A heater uses a standard 120 Volt power source. How much resistance is in the circuit if it uses a current of 4.2 Amperes? G:V=square A : I=square A J:square A=? E: 100. S: square ( )=(square square )/(square square ) S: square A=square A
- What is the acceleration of a fifty-car train that is going 25m/sec and It takes 150 seconds to stop? 6m/sec^2 0.17m/sec^2 -6m/sec^2 -0.17m/sec^2
- 1. Dalton theorized that matter is made of tiny, indivisible particles called atoms. In what way did the theories of each of these scientists support or differ from Dalton's theory? kni (a) J.J.Thomson (b) Ernest Rutherford (c) James Chadwick 2. In his experiments,J. J. Thomson discovered a tiny stream of particles. kru (a) Why did he conclude that these particles were negatively charged? (b) What were these particles eventually called? (c) According to Thomson , where are these particles located in the atom? (d) Why did Thomson conclude that atoms also contain a positive charge? (e) According to Thomson , where are the positive charges located in the atom? 3. If a neutral atom has three electrons, how many protons does it have? kru 4. In what ways is Bohr's model of the atom similar to and different from Thomson's model? kru
