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

5 months ago

Physics Physics Wave Optics

An unpolarized light beam is incident on the polarizes of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as 100 Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by 30° in clockwise direction, the intensity of emerging light will be________ Lumens.

0 Follower 2 Views

alok kumar singh

Contributor-Level 10

$l = l_{0} c o s^{2} θ = 100 * c o s^{2} (30 °) = 75 L u m e n s$

Note : As the incident light is unpolarized, intensity of emerging light does not depend on the polarization axis of polarizer.

0 0

New answer posted

5 months ago

Physics Class 11th

An inclined plane in bent in such a way that the vertical cross-section is given by y where y is in vertical and x in horizontal direction. If the upper surface of this curved plane is rough with coefficient of friction = 0.5, the maximum height in cm at with a stationary block with not skip downward is ____________cm.

0 Follower 6 Views

alok kumar singh

Contributor-Level 10

If the block does not slide,

mg sin $θ \leq μ m g c o s θ$

$\Rightarrow t a n θ \leq μ \Rightarrow \frac{d y}{d x} \leq μ \Rightarrow \frac{x}{2} \leq 0.5 \Rightarrow x \leq 1 m .$

Thus, $y \leq \frac{1^{2}}{4} = 0.25 m = 25 c m .$

0 0

New answer posted

5 months ago

Physics Work, Energy and Power

A ball with a speed of 9m/s collides with another identical ball at rest. After the collision the direction of each ball makes an angle 30° with the original direction. The ratio of velocities of the balls after collision is x : y, where x is_________.

0 Follower 1 View

alok kumar singh

Contributor-Level 10

Using conversation of momentum in direction perpendicular to the original direction of motion,

mv₁ sin 30° = mv₂ sin 30°

0 0

New answer posted

5 months ago

Physics Physics Alternating Current

A resonance circuit having inductance and resistance 2 * 10^-4 H and 6.28 $Ω$ respectively oscillates at 10 MHz frequency. The value of quality factor of this resonator is__________.

[p = 3.14]

0 Follower 3 Views

alok kumar singh

Contributor-Level 10

Quality factor = $\frac{ω L}{R} = \frac{2 * 3.14 * 10 * 1 0^{6} * 2 * 1 0^{- 4}}{6.28} = 2000$

0 0

New answer posted

5 months ago

Physics Class 11th

The coefficient of static friction between a wooden block of mass 0.5kg and a vertical rough wall is 0.2. The magnitude of horizontal force that should be applied on the block to keep it adhere to the wall be__________ N.

0 Follower 3 Views

alok kumar singh

Contributor-Level 10

f = W = 0.5 * 10 = 5 N

N = F

For block not to slide,

$f \leq μ N$

$\begin{array}{l} \Rightarrow 5 \leq 0.2 F \\ \Rightarrow F \geq 25 N \end{array}$

0 0

New answer posted

5 months ago

Physics Physics Mechanical Properties of Fluids

A hydraulic press can lift 100kg when a mass 'm' is place on the smaller piston. It can lift_______ kg when the diameter of the large piston in increases by 4 times and that of the smaller piston is decreased by 4 times keeping the same mass 'm' on the smaller piston.

0 Follower 2 Views

alok kumar singh

Contributor-Level 10

Ratio of masses on two pistons of the hydraulic lift equals to that of their cross- section area.

$\frac{A_{1}}{A_{2}} = \frac{100}{m}$

Now, $\frac{4^{2} A_{1}}{A_{2} / 4^{2}} = \frac{M}{m} ? M = 256 \frac{A_{1}}{A_{2}} . m = 25600 k g .$

0 0

New answer posted

5 months ago

Physics Class 12th

An audio signal V_m = 20 sin 2p(1500t) amplitude modulates a carrier

V_C = 80 sin 2p (100,000t)( The value of percent modulation is______________.

0 Follower 1 View

alok kumar singh

Contributor-Level 10

Percentage Modulation = $\frac{A_{m}}{A_{c}} * 100 = \frac{20}{80} * 100 = 25 %$

0 0

New answer posted

5 months ago

Physics Class 12th

In connection with the circuit drawn below, the value of current flowing through 2 $k Ω$ resistor is________ * 10^-4A

0 Follower 6 Views

alok kumar singh

Contributor-Level 10

Potential difference across 2k $Ω$ is 5V, thus current through it,

$i = \frac{5}{2 * 1 0^{3}} = 25 * 1 0^{- 4} A .$

0 0

New answer posted

5 months ago

Physics Class 11th

Can Mechanical Energy be negative?

0 Follower 2 Views

Aadit Singh Uppal

Contributor-Level 10

Yes. Mechanical energy is the sum of both kinetic and potential energies. Kinetic energy cannot be a negative value since mass is always positive and velocity square leads to a positive value. However, potential energy can be negative depending on the reference point.

0 0

New answer posted

5 months ago

Physics Class 11th

Does the concept of conservation of mechanical energy also apply to the real-world situations?

0 Follower 1 View

Aadit Singh Uppal

Contributor-Level 10

Not in all cases. This happens due to the interruption of non conservative forces like friction, air resistance, etc. which are responsible for decreasing the mechanical energy by converting it into other forms of energy such as heat, noise, etc.

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
681k Reviews
1800k 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