Physics Past Questions And Answers
(a) Define (i) Linear momentum; (ii) Impulse
(b) State the principle of conservation of linear momentum.
(c) A tractor of mass 5.0 x 10\(^{3}\)kg is used a tow a car of mass 2.5 x 103 kg. The tractor moved with a speed of 3.0 ms\(^{-1}\) just before the towing rope becomes taut. Calculate the:
(i) Speed of the tractor immediately the rope becomes taut
(ii) Loss in kinetic energy of the system just after the car has started Moving;
(iii) Impulse in the rope when it jerks the car into motion.
View Discussion (0)WAEC 2003 THEORYThe speed of fast-moving neutrons in a nuclear reactor can be reduced by using?
- A. graphite rods
- B. concrete shield
- C. iron rods
- D. boron rods
A silicon material is dopped with an element of a certain group and an n-type semi-conductor is formed. the most likely group of the element is
- A. V
- B. III
- C. I
- D. II
The absolute temperature of a perfect gas is proportional to the average
- A. potential energy of the molecules
- B. seperation between the molecules
- C. kinetic energy of the molecules
- D. velocity of the molecules
The time of flight for a projectile motion is given by the expression
- A. \(\frac{U sin \theta}{g}\)
- B. \(\frac{U sin \theta}{2g}\)
- C. \(\frac{2U sin \theta}{g}\)
- D. \(\frac{U sin 2\theta}{g}\)
A motor vehicle is brought to rest from a speed of 15ms-1 in 20 seconds. Calculate the retardation.
- A. 0.75ms-1
- B. 1.33ms-2
- C. 5.00ms-2
- D. 7.50ms-2
When a light-weight body and a massive body are acted upon by the same force for the same period of time, the .
- A. massive body has a higher momentum.
- B. massive body builds up a higher velocity.
- C. lighter body has a higher momentum.
- D. momenta of both bodies remain the same
An equipment whose power is 1500W and resistance is 375 ohms would draw a current of
- A. 0.10A
- B. 2.00A
- C. 4.00A
- D. 77.5A
When the plate area of a capacitor increases?
- A. the voltage can withstand increase
- B. the capacitance decreases
- C. the capacitance is unaffected
- D. the capacitance increases
A cell of internal resistance 0.01Ω can be measured accurately using the
- A. Ohm meter
- B. metre bridge
- C. potentiometer
- D. electroscope