PHY101 Final Term Past Paper 2009

For a body to be in equilibrium under the combined action of several forces:

1. all the forces must be applied at the same point

all the forces must be applied at the same point

1. all of the forces form pairs of equal and opposite forces
2. any two of these forces must be balanced by a third force
3. the sum of the torques about any point must equal zero

Q4. A bucket of water is pushed from left to right with increasing speed across a horizontal surface. (1 marks)

Consider the pressure at two points at the same level in the water.

1. It is the same
2. It is higher at the point on the left
3. It is higher at the point on the right
4. At first it is higher at the point on the left but as the bucket speeds up it is lower there

Q5. An organ pipe with both ends open is 0.85m long. Assuming that the speed of sound is 340m/s, the frequency of the third harmonic of this pipe is: (1 marks)

1. A. 200 Hz
2. C1/C2

Q7. If the potential difference across a resistor is doubled: (1 marks)

1. only the current is doubled
2. only the current is halved
3. only the resistance is doubled
4. only the resistance is halved