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TEST QUESTION 4.1

TEST QUESTION 4.1. When Galilo drops a ball from the second floor of the leaning tower of Pisa, it reach the ground in 1 s with a speed of 10m/s. When he did the same on the third floor, it reach the ground in 2s with a speed of xA : 5 m/s xB : 10 m/s xC : 15 m/s vD : 20 m/s.

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TEST QUESTION 4.1

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  1. TEST QUESTION 4.1 • When Galilo drops a ball from the second floor of the leaning tower of Pisa, it reach the ground in 1 s with a speed of 10m/s. When he did the same on the third floor, it reach the ground in 2s with a speed of • xA: 5 m/s • xB: 10 m/s • xC: 15 m/s • vD: 20 m/s

  2. Test question 4.2 Following the previous question, in order for the ball to reach the ground with 40 m/s (four times that achieved from the first floor), Galileo needs to go to a floor which is xA: 2 timeshigher than the first floor xB: 4 timeshigher thanthe first floor xC: 8 timeshigher thanthe first floor vD: 16 times higher than the first floor

  3. Test Question 4.3: • The mass and radius of the Moon are 80 and 4 times smaller than those of the Earth. Gravitational acceleration on the Moon is xA: 1/80 that of the Earth xB: 1/20 that of the Earth vC: 1/5 that of the Earth xD: same as that of the Earth

  4. Test question 4.4 • An Olympic high jumper can clear a 2 meter bar on the Earth. If she can life off at the same speed on the Moon, she would be able to clear a bar which is xA: 2 meter high xB: 4 meter high vC: 10 meter high xD: 1 km high

  5. Test question 4.5 • A recently discovered super-Earths has 8 times the mass as the Earth, 3 time the size as the Earth. Its density is xA: 8 times that of the Earth xB: one third that of the Earth xC: 8/3 times that of the Earth vD: 8/27 times that of the Earth

  6. Test question 4.6 • When a hot air balloon is heated to double its temperature, but to keep its volumn, the pressure inside the balloon would vA: double xB: remain the same xC: reduce to half xD: reduce to one quarter

  7. Test question 4.7 • Heat can be transported by xA: radiation only xB: convection only xC: conduction only vD: all of the above

  8. Test question 4.8 • Hydrogen atoms make a transition from ground to excited state when they are xA: cool down below 273 K xB: react with oxygen to form water molecules xC: spontaneously over millions of years vD: heated to several thousand degrees

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