Ondo Joint Physics Answers 2021

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ONDO JOINT PHYSICS 2021

8ai) Work is the measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement.

(8aii) Energy is defined as the “ability to do work, which is the ability to exert a force causing displacement of an object.”

8d)At constant pressure, the number of collision per unit time is constant. An increase in temperature causes average Kinetic energy increases. The molecules then move faster. The volume therefore increases so as to maintain the number of collision per unit time.

(9ai) The momentum of a body is the product of its mass and its velocity.

(9aii) The total momentum of a system before collision equals to the total momentum after collision provided no external force acts. OR In a system of colliding bodies the total momentum is constant provided no external force acts.

9b) (b) Mp Up + Mq Uq = Mp Vp + Mq Vq

0.25 Up + 0 = 0.25 x 23 Up + 0.25 x 2; 0.25

(Up – 2/3 Up) = 0.50; 1/3

Up = 0.500.25 = 2m/s

Up = 2 x 3 = 6m/s

(9c) Newton’s second law of motion states that the time rate of change of linear momentum is directly proportional to the force causing the change and the change takes place in the direction of the force

(9d) Resultant force on the vehicle = 9600 – 200 = 7400N.

But F = ma

a = Fm=74003400 = 2.18ms−2 or 2.2ms−2

(10b)

Heat lost = 0.024 x 400 (230 – T).

Heat gained by water = 0.054 x 4200 (T – 31)

Heat gained by calorimeter = 0.060 x 400 (T – 31)

Heat lost = Heat gained = 0.024 x 400 (230 – T) = 0.054 x 4200

(T – 31) + 0.060 x 400 (T – 31) T = 38.34°C

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