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Posted by Bhawani Sahu 1 day, 2 hours ago

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Gaurav Seth 1 day, 2 hours ago

**One parsec is _____ light years.**

** Answer: **3.26

**Explanation: **Parsec is the unit of length used to measure the large distances to astronomical objects outside the Solar System. It is obtained by the use of trigonometry and parallax.

**1 parsec = 3.26 light year**

Therefore, one parsec is equal to 3.26 light year.

Posted by Bhawani Sahu 1 day, 2 hours ago

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Bhawani Sahu 1 day, 2 hours ago

one streradian is defined as the angle made by a spherical plane of area 1square metre at the centre of a sphere of radius 1 m. 😀

Yogita Ingle 1 day, 2 hours ago

Steradian, unit of solid-angle measure in the International System of Units (SI), defined as the solid angle of a sphere subtended by a portion of the surface whose area is equal to the square of the sphere’s radius. Sin

Posted by Ankit Singh Thakur💔💔😔😢 1 day, 13 hours ago

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Bhawani Sahu 1 day, 3 hours ago

parallax is a displacement or difference on the apparent position of an object viewed along two different lines of sight and is measured by the angle or semi angle of inclination between those two lines. 😊🤓🤓🤓

Naira 😇😇😇 .# Hate Luv Story... 😈😈 1 day, 2 hours ago

Parallax is a displacement or difference in the apparent position of an object viewed along two d/f lines of sight, and is measured by the angle or semi - angle of inclination b/w those two lines....
Hope this ans will help u..
Thank u...

Naira 😇😇😇 .# Hate Luv Story... 😈😈 1 day, 2 hours ago

Parallax is a displacement or difference in the apparent position of

Posted by Pooja Ranjna 1 day, 15 hours ago

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Posted by Pooja Ranjna 1 day, 18 hours ago

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Gaurav Seth 1 day, 18 hours ago

1. We can multiply both the sides with zero to equalise them.

2. We can use **roman numbers** to prove this.

19 is written as XXIX

1 is written as I

20 is written as XXX

So, we can write it as:

XXIX - I = XXX

**Hence, it is proved that 19-1= 20.**

Posted by Abhishek Solanki 1 day, 19 hours ago

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Gaurav Seth 1 day, 19 hours ago

A radian is actually a SI unit to measure the angle and for a complete 360 degree the angle in radian is 2π

so on comparing we have

2π = 360

so

π = 180 degree

so to solve the angles u have to take the value of π = 180

and when u get the angle in radian with π u can solve it by using the valoue of π = 22/7.

Posted by Diya Prajapati 1 day, 20 hours ago

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Gaurav Seth 1 day, 19 hours ago

**Make a Study Plan**

Make a strategic study plan for covering the entire syllabus. Set small targets to achieve on how many topics to complete in say one week, one month, three months, etc. Also, keep time for revision and mock tests in your study plan.

For more click on the given link :

<a href="https://www.examsplanner.in/articles/how-to-start-preparation-for-iit-jee-from-class-11/">https://www.examsplanner.in/articles/how-to-start-preparation-for-iit-jee-from-class-11/</a>

Posted by Khushboo Sahu 2 days, 1 hour ago

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Posted by Khushboo Sahu 1 day, 2 hours ago

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Gaurav Seth 2 days, 1 hour ago

Answer : Angle will be 60^{o}

**Explanation:**

According to the formula of and we can write it as following-

[+2pq and -2pq will be cancel]

Theta

Posted by Khushboo Sahu 1 day, 2 hours ago

- 1 answers

Yogita Ingle 2 days, 1 hour ago

Let θθ be the angle between the two vectors A and B such that, |A| = |B|.

Therefore, R^{2}=A^{2}+B^{2}+2ABcosθ

=>A^{2}=A^{2}+A^{2}+2AAcosθ

[∵ |A| = |B| = |R|]

=>A^{2}=2A^{2}+2A^{2}cosθ

=>cosθ=−1/2

=>θ=120∘

Posted by Khushboo Sahu 1 day, 2 hours ago

- 1 answers

Gaurav Seth 2 days, 1 hour ago

If the direction of the resultant force does not change, it means the angle between them remain the same.

Assuming the angle was initially 45 degrees, it will remain the same

Tan 45 = 2p/2p = 1

First force is doubled, it becomes = 4p

20N is added to the second force, it becomes = 2p + 20

Tan 45 = 4p/(2p + 20) = 1

4p = 2p + 20

2p = 20

p = 10 N

Posted by S G 2 days, 16 hours ago

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Posted by Nandini Rathour 4 days, 13 hours ago

- 3 answers

Gaurav Seth 4 days, 1 hour ago

**Given:**

Percentage error in measurement of side of cube = 2 %

i.e., (Δa/a) × 100 = 2 %

**To Find:**

Percentage error in the volume and area of cube.

**Calculation:**

- Area of cube, A = a²

⇒ Percent error in area is given by

(ΔA/A) × 100 =2 (Δa/a) × 100

⇒ (ΔA/A) × 100 = 2 × 2

**⇒ (ΔA/A) × 100 = 4 %**

- Volume of cube, V = a³

⇒ Percent error in volume is given by

(ΔV/V) × 100 = 3 (Δa/a) × 100

⇒ (ΔV/V) × 100 = 3 × 2

**⇒ (ΔV/V) × 100 = 6 %**

**- Thus, % error in area and volume is 4 % and 6 % respectively.**

Posted by Khushboo Sahu 4 days, 15 hours ago

- 1 answers

Yogita Ingle 4 days, 15 hours ago

As one component of 80km/hr velocity is 40km/hr , then ;

cos (theta) = 40/80

= 1/2

(theta) = 60°

other component will be ;

cos (90-60) = x/80

80 × cos 30° = x

x = 80×√3/2

x = 40√3 km/hr

Posted by Khushboo Sahu 4 days, 15 hours ago

- 1 answers

Gaurav Seth 4 days, 1 hour ago

Given, two force act on a body at angle 60° , exact force is equal to 4 N

so, magnitude of resultant force is --

now, let angle between resultant force and vector force is ∅

now,

tan ∅ =

so, ∅ = 30°

hence, resultant force is 30° from forces 4N

Posted by Saket Jha 4 days, 20 hours ago

- 1 answers

Yogita Ingle 4 days, 18 hours ago

**Acceleration** is rate of change of velocity with time. It is denoted by ‘**a’** and the SI unit is **m/s ^{2}**.

**Average acceleration** is change of velocity over a time interval.

Posted by Divyanshi Goswami 5 days, 22 hours ago

- 2 answers

Pooja Ranjna 3 days ago

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11th
Physics
Units and Measurement
Measurement of Length
The nearest star to our sol...
PHYSICS
￼Asked on October 15, 2019 bySweety Jêthî
The nearest star to our solar system is 4.29 light years away. How much is this distance in terms of parsecs? How much parallax would this star (named Alpha Centauri) show when viewed from two locations of the Earth six months apart in its orbit around the Sun ?
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ANSWER
Given:
The distance of the star is,=4.29 ly
We know that one light year is the distance travelled by light in one year.
1 light year = 3×108×365×24×60×60
=94608×1011m
Therefore, the distance in 4.29 ly can be written as:
4.29 ly=405868.32×1011 m
We know that 1 Parsec is also the unit of distance and its value is:
1 parsec=3.08×1016m
Now, to express the distance in terms of parsec.
4.29ly=3.08×1016405868.32×1011=1.32 parsec
The diameter of the Earth's orbit is,
d=3×1011m
The angle made by the star on the Earth's orbit can be given by:
θ=405868.32×10113×1011=7.39×10−6rad
But, the angle covered in 1sec=4.85×10−6rad
So, the parallax in viwing the star at two different positions of the Eart's orbit:
for, 7.39×10−6rad=4.85×10−67.39×10−6=1.52"

Posted by Sarthak Gandhi 5 days, 23 hours ago

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Gaurav Seth 6 days ago

The units which are independent of each other are known as Fundamental Units. Derived Units are derived from Fundamental Units. For example, meter is a fundamental unit of length and second is a fundamental unit of time. However, meter per second (ms^{-1}) is a derived unit of velocity. There are seven fundamental units as given in the below table:

1. | Length | metre | m |

2. | Mass | kilogram | kg |

3. | Time | second | S |

4. | Temperature | Kelvin | kg |

5 | Electric current | ampere | A |

Posted by Divyanshi Goswami 5 days, 2 hours ago

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Swastik Mishra 6 days, 1 hour ago

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Posted by Pro Gamer Gaming 5 days, 2 hours ago

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Muskan And Tushar Hooda 6 days, 1 hour ago

S Chand and pradeep's for chemistry and physics

Posted by Pro Gamer Gaming 5 days, 2 hours ago

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Pooja Ranjna 6 days, 2 hours ago

In science stream, maths and physics are related to each other because they help us in engineering and biology and chemistry is related to each other because it helps in doctoring. You can see that you are right or wrong.
I think you have choosed right option.😊😊👍👍

Posted by Prabhat Singh 5 days, 2 hours ago

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Anjali Singh 1 week ago

Fundamental physical quantity have dimension& unit as well , supplementary quantity are dimensionless but have units

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Yogita Ingle 33 minutes ago

It is given that,

Vector, a^ =3i^+4j^

Vector, b^ = 2i^-3j^

We have to find the component of vector a along the direction of vector b.

.............(1)

N= -1.6

So, the component of vector a =3 i+4 j along the direction of b =2 i - 3 j is -1.6.

Hence, this is the required solution.

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