Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
5.0 x 10−4Nm−2
5.0 x 10−5Nm−2
2.0 x 10−8Nm−2
2.0 x 109Nm−2
Correct answer is D
Young's modulus stressstrain
Strain = el=0.0510=1070.005
2 x 109Nm−2
When the breaks in a car are applied, the frictional force on the tyres is?
a disadvantage because it is in the direction of the motion of the car
a disadvantage because it is in the opposite direction of the motion of the car
an advantage because it is in the direction of the motion of the car
an advantage because it is in the opposite direction of the motion of the car
Correct answer is D
Frictional force opposes motion
A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?
1.25 x 104W
2.50x 104W
1.25 x 106W
2.50 x 106W
Correct answer is B
P = mv2t=800×25×2520
2.5 x 104W
5J
10J
15J
20J
Correct answer is C
m = 0.1kg
u = 10ms−1
h = 10m
g = 10ms−2
At hmax; v = 0
Using
v̸ = u̸ = g̸t
⧸0 = w̸ - ⧸10t
v2 = u2 - 2gh
02 = 102 - 2 x 10h
20h = 100
h = 5m
Total height = 10 + 5
= 15m
Total energy = mghr = 0.1 x 10 x1 5
= 15J