Tags Physics

Physics

Get insights from 5.6k questions on Physics, answered by students, alumni, and experts. You may also ask and answer any question you like about Physics

Follow Ask Question

5.6k

Questions

Discussions

Active Users

Followers

New answer posted

8 months ago

Physics Physics System of Particles and Rotational Motion

Consider a situation in which a ring, a solid cylinder and a solid sphere roll down on the same inclined plane without slipping. Assume that they start rolling from rest and having identical diameter.

0 Follower 4 Views

Vishal Baghel

Contributor-Level 10

Using conservation of energy:

$m g h = \frac{1}{2} l_{c m} ω^{2} + \frac{1}{2} m v^{2} = \frac{1}{2} l_{c m} \frac{V^{2}}{r^{2}} + \frac{1}{2} m v^{2}$

$v^{2} = \frac{m g h}{\frac{1}{2} \frac{l_{c m}}{r^{2}} + m v^{2}}$

So, sphere has the greatest velocity of COM and ring has least.

0 0

New answer posted

8 months ago

Physics Thermodynamics

What will be the average value of energy for a monatomic gas in thermal equilibrium at temperature T?

0 Follower 3 Views

Vishal Baghel

Contributor-Level 10

Total energy of monoatomic gas at equilibrium

$= \frac{3}{2} K_{B} T$

0 0

New answer posted

8 months ago

Physics Class 11th

The motion of a mass on a spring, with spring constant K is as shown in figure. The equation of motion is given by x(t) = 4 sin $ω t + B c o s ω t w i t h ω = \sqrt[]{\frac{K}{m}} .$ Suppose that at time t = 0, the position of mass is x(0) and velocity $υ (0),$ then its displacement can also be represented as x(t) = C cos $(ω t - ?),$ where C and $?$ are:

0 Follower 22 Views

Vishal Baghel

Contributor-Level 10

x (t) = A sin $ω$ t + B cos $ω t$

$\Rightarrow x (t) = \sqrt[]{A^{2} + B^{2}} s i n (ω t + δ) = \sqrt[]{A^{2} + B^{2}} c o s (ω t - (\frac{π}{2} - δ))$

At t = 0:

$x (0) = \sqrt[]{A^{2} + B^{2}} s i n (δ)$

$v (0) = ω \sqrt[]{A^{2} + B^{2}} c o s (δ)$

$\Rightarrow {(x (0))}^{2} + {(\frac{v (0)}{ω})}^{2} = A^{2} + B^{2}$

$t a n ? = t a n (\frac{π}{2} - δ) = c o t δ = \frac{v (0)}{x (0) ω}$

$\Rightarrow ? = t a n^{- 1} (\frac{v (0)}{x (0) ω})$

0 0

New answer posted

8 months ago

Physics Magnetism and Matter

Choose the correct option:

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

True dip is less than the apparent dip.

0 0

New answer posted

8 months ago

Physics Communication Systems

What should be the height of transmitting antenna and the population covered if the televition telecast is to cover a radius of 150 km? The average population density around the tower is 200 / km² and the value of R_e = 6.5 * 10⁶ m.

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

d = 150 km

$d = \sqrt[]{2 h R}$

$h = \frac{d^{2}}{2 R} = \frac{{(150 * 1 0^{3})}^{2}}{2 * 6.5 * 1 0^{6}} = 1731 m .$

Population covered

$π r^{2} * σ = 3.14 * 15 0^{2} * 2000 = 1413 * 1 0^{5}$

0 0

New answer posted

8 months ago

Physics Class 11th

A bullet of '4g' mass is fired from a gun of mass 4kg. If the bullet moves with the muzzle speed of 50 ms^-¹, the impulse imparted to the gun velocity of recoil of gun are:

0 Follower 7 Views

Vishal Baghel

Contributor-Level 10

for bullet

$l = Δ p = m v - 0$

$= \frac{4}{1000} * 50 = \frac{20}{100} = 0.2 k g - m / s$

Using conservation of momentum :

Pi = Pt

$\Rightarrow \frac{4}{1000} * 50 = 4 * v$

v = 0.05 m/s

0 0

New answer posted

8 months ago

Physics Magnetism and Matter

Statement I : The ferromagnetic property depends on temperature. At high temperature, ferromagnet becomes paramagnet.

Statement II : At high temperature, the domain wall are of a ferromagnetic substance increases.

In the light of the above statements, choose the most appropriate answer from the options given below:

0 Follower 8 Views

Vishal Baghel

Contributor-Level 10

I : at high temperature, ferromagnet becomes paramagnet.

II : at high temperature, domains of ferromagnet will break

0 0

New answer posted

8 months ago

Physics Class 11th

T₀ is the time period of a simple pendulum at a place. If the length of the pendulum is reduced to $\frac{1}{16}$ times of its initial value, the modified time period is:

0 Follower 3 Views

Vishal Baghel

Contributor-Level 10

$\frac{T}{T'} = \frac{2 π \sqrt[]{\frac{l}{g}}}{2 π \sqrt[]{\frac{l}{\frac{16}{g}}}}$

$\Rightarrow \frac{T}{T'} = \frac{1}{(\frac{1}{4})} = 4$

$\Rightarrow T' = \frac{T}{4}$

0 0

New answer posted

8 months ago

Physics Work, Energy and Power

A porter lifts a heavy suitcase of mass 80kg and at the destination lowers it down by a distance of 80 cm with a constant velocity. Calculate the work done by the porter in lowering the suitcase.

(take g = 9.8 ms^-²)

0 Follower 3 Views

Vishal Baghel

Contributor-Level 10

W = mgh

$= 80 * 9.8 * (\frac{80}{100})$

$= 627.2 J$

$\begin{array}{l} \Rightarrow w_{f} + w_{g} = 0 \\ \Rightarrow w_{f} = - 627.2 J \end{array}$

0 0

New answer posted

8 months ago

Physics Class 12th

Consider a situation in which reverse biased current of a particular P – N junction increase when it is exposed to a light of wavelength $\leq$ 621 nm. During this process, enhancement in carrier concentration takes place due to generation of hole – electron pairs. The value of band gap is nearly.

0 Follower 3 Views

Vishal Baghel

Contributor-Level 10

$E = \frac{h c}{λ} = \frac{1242 e V - n m}{621 n m} = 2 e V$

minimum 2eV is required to emit.

0 0

Get authentic answers from experts, students and alumni that you won't find anywhere else

On Shiksha, get access to

66k Colleges
1.2k Exams
688k Reviews
1850k Answers

Community GuidelinesUser Points System

QuestionsDiscussionsTags

Need guidance on career and education? Ask our experts

Your Question

Physics

Questions

Discussions

Active Users

Followers

All

Discussions

Unanswered Questions

Share Your College Life Experience