An impulse of 100 N is applied to an object.
If this same impulse is delivered over a longer time interval:
The momentum transferred will be increased.
The force involved will be decreased.
The force involved will be increased.
The momentum transferred will be decreased.
The set up in the figure is used to study the relationship between current (I) and potential difference (V) for a wire X. The most likely shape of the graph of the potential difference (Y) against current (X) for the copper wire is:
C.
B.
A.
D.
The value of X for which the galvanometer in the figure shows a null deflection is:
1Ω.
4.5 Ω.
8Ω.
4Ω.
The set up in the figure is used to study the relationship between current (I) and potential difference (V) for a wire X.
The rheostat Y is used to:
Keep the temperature constant.
Vary the current in the circuit.
Vary the resistance of the wire.
Vary electromotive force.
The heating element of an electric kettle has a resistance of 30.0 Ω.
The kettle is connected to an a.c. power supply of root means square voltage 230 V.
The peak value of the current is:
10.8 A.
7.7 A.
15.2 A.
5.4 A.
