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.
The energy stored in a spring of stiffness constant k = 2000\(Nm^{-1}\) when extended 4cm is
0.16J
1.60J
16.00J
160.00J
Correct answer is B
The spring constant = the measure of stiffness = 2000\(Nm^{-1}\)
Energy stored in a spring = Work done to stretch it through a distance = change in potential energy
= \(\frac{kx^{2}}{2}\) = \(\frac{2000 \times (0.04)^{2}}{2}\) (converting 4cm to metres)
= \(\frac{3.2}{2} = 1.60J\)
I
II
III
IV
Correct answer is B
No explanation has been provided for this answer.
A body can undergo the following types of motion except
random
rotational
translational
relative
Correct answer is D
Relative motion is the calculation of the motion of an object with regard to some other moving object. Hence, relative motion is not a type of motion.
The angle at which a projectile must be fired to cover maximum range is
30°
45°
60°
90°
Correct answer is B
The formula is \(\frac{v^{2}sin2\theta}{g}\)
And the sine graph is highest at 1 with its inverse as 90°. Hence, \(2\theta\) = 90°
\(\theta\) = 45°
50.0m
28.8m
18.0m
8.0m
Correct answer is D
Convert velocity from \(kmh^{-1}\) to \(ms^{-1}\), by multiplying \(\frac{1000}{3600}\),
\(72 \times \frac{1000}{3600}\) = \(20ms^{-1}\)
Therefore, distance covered in 0.4s = \(20 \times 0.4 = 8m\)