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PHY101 8/10

1. CALCULATE THE VOLUME OF WATER THAT ESCAPES
14.0 m3min-1

2. TWO BLOCKS A AND B OF MASSESS 2KG...
1.37 ms-2; 62.54 N

3. Heat transfer in fluids occur basically through the process of ___________
convection

4. A truck of mass M = 5000 kg is crossing a uniform horizontal bridge of mass m = 1000 kg and length l = 100 m. The bridge is supported at its two end-points. What are the reactions at these supports when the truck is one third of the way across the bridge?
2.13×104 N; 3.76×104 N

5. Which of the following fundamental forces is responsible for the radioactive β-decay of a particle?
Electro-weak or weak nuclear force

6. Calculate the percentage error in a steel tape used for measurement on a cold day when the temperature is -5 ℃ if it was calibrated at 20 ℃. [αsteel=1.1×10-5 ℃-1]
0.025 %

7. The cross-sectional area of a copper wire of length 1.1 m is 1.0 mm2. It is loaded with a 1-kg mass. Calculate the increase in length of the wire. [Take Young's modulus of copper as 1.1×1011Nm-2 and g=10 ms-2].
0.10 mm

8. The spread of covid-19 can be prevented by wearing face-masks. Which physical principle can be applied to correctly explain this statement?
Surface tension

9. A rocket of mass 1000 kg exhausts gases at a rate of 4 kg/sec with a velocity 3000 m/s. The thrust developed on the rocket is:
12000 N

10. An object is thrown straight upward from the edge of a building with a velocity of 20 ms-1. Where will the object be 5 s after it was thrown?
22.5 m below the point from which it was thrown