Question
What is meant by 'point object' in physics?
✓
Answer
An object is said to be point object if its dimensions are negligible as compared to the distance travelled by it. For example, an aeroplane which flies from Delhi to London.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
How much is KE for displacement equal to half the amplitude?
A thin spherical shell having uniform density is cut in two parts by a plane and kept separated as shown in figure (11-E3). The point A is the centre of the plane section of the first part and B is the centre of the plane section of the second part. Show that the gravitational field at A due to the first part is equal in magnitude to the gravitational field at B due to the second part.
State the rules for finding the number of significant figures in a measurement.
A monkey climbs up a slippery pole for 3 seconds and subsequently slips for 3 seconds. Its velocity at time t is given by v(t) = 2t(3 - t); 0 < t < 3 and v(t) = -(t - 3)(6 - t) for 3 < t < 6s in m/s. It repeats this cycle till it reaches the height of 20m.
At what time is its velocity maximum?
At what time is its velocity maximum?
Justify the following statements:
→- The motion of an artificial satellite around the earth cannot be taken as $\text{SHM}.$
- The time period of a simple pendulum will get doubled if its length is increased four times.
A mercury barometer has a quartz bulb of volume $0.300cm^3$ and a stem of bore 0.0100cm. How far does the indicating thread of mercury move when the temperature changes from $30^\circ C$ to $45^\circ C$? Ignore the small expansion of the quartz bulb. The volume expansivity of mercury is $182 \times 10^{-6}(^\circ C)^{‑1}$.
→There are equal number of molecules of $H _2$ and $O _2$ in a vessel. If there is a tiny hole in the vessel, which gas will leak faster?
→The earth constantly receives heat radiation from the sun and gets warmed up. Why does the earth not get as hot as the sun?
Interatomic and intermolecular forces are similar in certain aspects. Justify.
A bullet of mass $0.04 kg$ moving with a speed of $90 m s ^{-1}$ enters a heavy wooden block and is stopped after a distance of $60 cm$. What is the average resistive force exerted by the block on the bullet?
→