Master the Art of Physics: Comprehensive Examples and Expert Advice

A Carnot engine operates between two reservoirs of temperature $900K$ and $300K$. The engine performs $1200J$ of work per cycle. The heat energy in$\left(J\right)$ delivered by the engine to the low-temperature reservoir, in a cycle, is

If I weigh 60 kgs on Earth, then I will weight kgs on the Moon.
A)20
B)30
C)10
D)5

Latent heat of fusion for ice is....

How to find which is positive and negative terminal in a Circuit diagram made using lines.

Motion is the change of location or position of an object with time relative to an observer. True or false

A car of mass 2400 kg moving with a velocity of $20m{s}^{-<!--\; -\; -->1}$ is stopped in 10 seconds on applying brakes. Calculate the retardation and the retarding force.

On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why?

How does heat from the Sun reach us?

Why concave lens diverge and convex lens converge light rays?

How much air resistance acts on a falling 100-N box of nails when it reaches terminal velocity?

When a mass m is hung from a spring of negligible mass with a force constant k, it extends by an amount y. The mass is gently drawn down and released. The system begins to execute simple harmonic motion of amplitude A and angular frequency ω. The total energy of the mass - spring system will be
A) $\frac{1}{2}m{A}^2{\mathrm{\omega <!--\; \omega \; -->}}^2$
B) $\frac{1}{2}m{A}^2{\mathrm{\omega <!--\; \omega \; -->}}^2+\frac{1}{2}k{y}^2$
C) $\frac{1}{2}k{y}^2$
D) $\frac{1}{2}m{A}^2{\mathrm{\omega <!--\; \omega \; -->}}^2-<!--\; -\; -->\frac{1}{2}k{y}^2$

How does light travel?
In a straight line
Light does not travel
In a circular path
In a curved path

A car accelerates uniformly from 5m/s to 10m/s in 5 sec a. Calculate the acceleration b. The distance covered by the car in that time

What will happen if voltmeter is connected in series?

When a magnet is brought close to the loop, the induced current in the loop will be in a direction such that the part of the loop facing the magnet repels the magnet. Using the above statement, choose the correct answers.
When the north pole of the magnet is brought close to the loop, the current will be anticlockwise
When the south pole of the magnet is brought close to the loop, the current will be clockwise
When the south pole of the magnet is brought close to the loop, the current will be anticlockwise
When the north pole of the magnet is brought close to the loop, the current will be clockwise

A particle moves along x-axis and its acceleration at any time t is $a=2\sin <!--\; \; -->(\mathrm{\pi <!--\; \pi \; -->}t)$, where t is in seconds and a is in $m/s^2$. The initial velocity of particle (at time t=0) is u=0. Then the distance travelled (in meters) by the particle from time t=0 to t=t will be
A)$\frac{2}{{\mathrm{\pi <!--\; \pi \; -->}}^2}\sin <!--\; \; -->\mathrm{\pi <!--\; \pi \; -->}t-<!--\; -\; -->\frac{2t}{\mathrm{\pi <!--\; \pi \; -->}}$
B)$-<!--\; -\; -->\frac{2}{{\mathrm{\pi <!--\; \pi \; -->}}^2}\sin <!--\; \; -->\mathrm{\pi <!--\; \pi \; -->}t+\frac{2t}{\mathrm{\pi <!--\; \pi \; -->}}$
C)$\frac{2t}{\mathrm{\pi <!--\; \pi \; -->}}$
D)None of these

If the net force on an object is zero, then the object will ______.
A) accelerate
B) decelerate
C) be in uniform motion
D) come to rest

Name the force which always opposes the motion.

Water can be made to boil at a temperature above or below $100°C$. Explain.

What are Gs? And why do they increase with speed?