**Himanshi Verma**

A unit vector is a vector that has a magnitude of 1 unit. A unit vector is also known as direction vector.

*-Answered by Himanshi Verma* On 25 November 2020:01:14:31 PM

**Question 1.** **Asked on :**25 November 2020:01:13:41 PM

What is Unit vector?

*-Added by Himanshi Verma* **Physics** » **Motion In A Plane**

**Answer:**

A unit vector is a vector that has a magnitude of 1 unit. A unit vector is also known as direction vector.

*-Answered by Himanshi Verma* On 25 November 2020:01:14:31 PM

**Question 2.** **Asked on :**11 July 2020:12:59:31 PM

Can two non-zero vectors give zero resultant when they multiplying with each other?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Yes. For example, the cross product of two non-zero vectors will be zero when angle Θ=0°or 180

*-Answered by Shruti Srivastva * On 11 July 2020:01:01:30 PM

**Question 3.** **Asked on :**11 July 2020:12:57:10 PM

What furnishes the centripetal acceleration for the earth to go round the sun?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

The gravitational pull of the sun on the earth.

*-Answered by Shruti Srivastva * On 11 July 2020:12:58:58 PM

**Question 4.** **Asked on :**11 July 2020:12:55:37 PM

Define cross product of two vectors A and B?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

*-Answered by Anjali Kumari* On 15 October 2020:07:24:04 PM

**Question 5.** **Asked on :**11 July 2020:12:55:06 PM

Define null vector?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

According a Scientific website - Null vector is type of vector has zero magnitude and arbitrary direction and it's displacement will zero.

*-Answered by Dr. MS Khan* On 18 July 2020:02:52:49 PM

**Question 6.** **Asked on :**11 July 2020:12:53:39 PM

Define unit vector?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

A vector is a quantity which has both magnitudes, as well as direction. A vector which has a magnitude of 1 is a

*-Answered by Anjali Kumari* On 15 October 2020:07:25:12 PM

**Question 7.** **Asked on :**11 July 2020:12:34:04 PM

Name two quantities which have maximum value when the maximum height attained by the projectile in the largest?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

(i) vertical component of initial velocity.

(ii) Time of flight.

*-Answered by Shruti Srivastva * On 11 July 2020:12:36:30 PM

**Question 8.** **Asked on :**11 July 2020:12:31:25 PM

A particle moves in a plane with uniform acceleration in a direction different from its initial velocity. What will be the trajectory followed by the particles?

*-Added by Shruti Srivastva * **Chemistry** » **Motion In A Plane**

**Answer:**

Parabolic path.

*-Answered by Shruti Srivastva * On 11 July 2020:12:33:50 PM

**Question 9.** **Asked on :**11 July 2020:12:18:12 PM

Whe does the direction of of motion of a projectile become horizontal at the highest point of its treajectory?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

At the highest point; the vertical component of projectile velocity becomes zero. The projectile has only the horizontal component of velocity.

*-Answered by Shruti Srivastva * On 11 July 2020:12:20:51 PM

**Question 10.** **Asked on :**10 July 2020:06:10:44 PM

Is it true that the instantaneous velocity of a projectile is thagential to its parabolic path?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Yes it is true.

*-Answered by Shruti Srivastva * On 10 July 2020:06:13:13 PM

**Question 11.** **Asked on :**10 July 2020:06:08:33 PM

A football is thrown in a parbolic path. Is there any point at which the acceleration is perpendicular to the velocity?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Yes, at the highest point of the parabolic path.

*-Answered by Shruti Srivastva * On 10 July 2020:06:10:07 PM

**Question 12.** **Asked on :**10 July 2020:06:05:46 PM

Name the quantity which remains unchanged during the flight of an oblique projectile.

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Horizontal component of velocity.

*-Answered by Shruti Srivastva * On 10 July 2020:06:07:34 PM

**Question 13.** **Asked on :**10 July 2020:06:00:48 PM

Can a body possess velocity st the same time in horizontal and vertical?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Horizontal component of velocity.

*-Answered by Shruti Srivastva * On 10 July 2020:06:05:21 PM

**Question 14.** **Asked on :**10 July 2020:05:58:17 PM

Velocity of a projectile is 10ms^{-1 }. At what angle to the horizontally should it be projected so that it covers maximum horizontal distance?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Yes, a body in projectile motion possesses both horizontal and vertical velocities.

*-Answered by Shruti Srivastva * On 10 July 2020:06:04:07 PM

**Question 15.** **Asked on :**10 July 2020:05:56:28 PM

What are horizontal and vertical components of acceleration of a body thrown horizontally with uniform speed?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

For a body thrown horizontally with a uniform speed,

acceleration along horizontal=0

acceleration along vertical=g

*-Answered by Shruti Srivastva * On 10 July 2020:06:02:12 PM

**Question 16.** **Asked on :**10 July 2020:05:53:14 PM

When vectors are added or subtracted, their resultant is a vector. Is it also true in case of multiplication of two vectors?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

May or may not be. The dot product of two vectors gives a scalar quantity while the cross product gives a vector quantity.

*-Answered by Shruti Srivastva * On 10 July 2020:05:54:55 PM

**Question 17.** **Asked on :**10 July 2020:05:49:51 PM

Two vectors of magnitude 5 and 3 give a resultant of magnitude 2. What must be the angle between the two vector?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

As 5-3=2 this indicates that the two vectors have opposite directions and angle between them = 180º

*-Answered by Shruti Srivastva * On 10 July 2020:05:51:38 PM

**Question 18.** **Asked on :**10 July 2020:05:46:38 PM

Two vectors of magnitude 3 and 4 give a resultant of magnitude 2. What must be the dot product of these two vectors?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Question 19.** **Asked on :**10 July 2020:05:42:13 PM

Can the magnitude of the resultant vector of two given vectors be less than the magnitude of either vector?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Yes,zΘº

*-Answered by Shruti Srivastva * On 10 July 2020:05:43:47 PM

**Question 20.** **Asked on :**10 July 2020:05:38:35 PM

Give one example of dot products of vectors.

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Work done is equal to the dot product of force and displacement vectors.

*-Answered by Shruti Srivastva * On 10 July 2020:05:39:49 PM

**Question 21.** **Asked on :**10 July 2020:05:35:59 PM

Under what condition is the scalar product of two non-zero vectors zero?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

When they are mutually perpendicular to each other.

*-Answered by Shruti Srivastva* On 10 July 2020:05:41:11 PM

**Question 22.** **Asked on :**10 July 2020:02:16:56 PM

Fifteen vectors, each of magnitude 5 units, are represented by the sides of a closed polygon, all taken in same order. What will be their resultant?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Zero vector. The vector sum of all the vectors represented by the sides of a closed polygon taken in the same order is zero.

*-Answered by Shruti Srivastva * On 10 July 2020:02:19:27 PM

**Question 23.** **Asked on :**10 July 2020:02:14:42 PM

Can any of the components of a given vector have greater magnitude than that of the vector itself?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Yes, provided the components are not rectangular.

*-Answered by Shruti Srivastva * On 10 July 2020:02:16:10 PM

**Question 24.** **Asked on :**10 July 2020:02:12:58 PM

Can the sum of two vectors be a scalar?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

No, the sum of two vectors is always a vector.

*-Answered by Shruti Srivastva * On 10 July 2020:02:13:56 PM

**Question 25.** **Asked on :**10 July 2020:02:11:35 PM

Is the division of vector defined?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

No, the division of vector cannot be defined

*-Answered by Shruti Srivastva * On 10 July 2020:02:12:16 PM

**Question 26.** **Asked on :**10 July 2020:02:09:42 PM

Give an example of a zero vector.

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

The displacement of a ball thrown up and received and back by the thrower is a zero vector.

*-Answered by Shruti Srivastva * On 10 July 2020:02:10:24 PM

**Question 27.** **Asked on :**10 July 2020:02:07:11 PM

Does it make a sense to call a physical quantity a vector, when its magnitude is zero?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Yes. A zero vector has a definite physical significance.

*-Answered by Shruti Srivastva * On 10 July 2020:02:08:37 PM

**Question 28.** **Asked on :**10 July 2020:02:04:30 PM

What is the minimum number of forces of equal magnitude whose vector sum is zero?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Two force provided the forces have opposite direction.

*-Answered by Shruti Srivastva * On 10 July 2020:02:06:26 PM

**Question 29.** **Asked on :**10 July 2020:01:56:38 PM

Can three vectors of different magnitudes be combined to give a zero resultant?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Yes, when three vectors are represented by the three sides of a triangle taken in order, they will have resultant null-vector.

*-Answered by Shruti Srivastva * On 10 July 2020:01:58:11 PM

**Question 30.** **Asked on :**10 July 2020:01:54:02 PM

The resultant of two or more vectors is that single vector which produces the same effect as the individual vectors together produce?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Question 31.** **Asked on :**10 July 2020:01:52:04 PM

Under what condition the sum and difference of two vectors will be equal in magnitude?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

When the two vectors are perpendicular to each other.

*-Answered by Shruti Srivastva * On 10 July 2020:01:53:23 PM

**Question 32.** **Asked on :**10 July 2020:01:49:38 PM

When can the addition of two vectors be zero?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

The addition of two vectors can be zero only when these vectors have equal magnitude and opposite direction.

*-Answered by Shruti Srivastva * On 10 July 2020:01:50:47 PM

**Question 33.** **Asked on :**10 July 2020:01:47:49 PM

When is the sum of two vectors are minimum?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

When two vectors have opposite directions, their sum is minimum.

*-Answered by Shruti Srivastva * On 10 July 2020:01:48:47 PM

**Question 34.** **Asked on :**10 July 2020:01:46:05 PM

When sum of two vectors are maximum?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

When two vectors have same direction, their sum is maximum.

*-Answered by Shruti Srivastva * On 10 July 2020:01:47:05 PM

**Question 35.** **Asked on :**10 July 2020:01:43:32 PM

A given quantity has both magnitude and direction. Is it necessarily a vector?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

No. The given quantity will be a vector only if it obeys the law of vector addition.

*-Answered by Shruti Srivastva * On 10 July 2020:01:44:53 PM

**Question 36.** **Asked on :**10 July 2020:01:40:22 PM

Does a scalar quantity depend on the frame of reference chosen?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

No. A scalar quantity does not depend on the frame of reference.

*-Answered by Shruti Srivastva * On 10 July 2020:01:42:18 PM

**Question 37.** **Asked on :**10 July 2020:01:36:31 PM

What is the minimum number of coplanar vectors of different magnitude which can give zero resultant ?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

Three. If three vectors can be represented by the three sides of a triangle taken in the same order, then their resultant is a zero vector.

*-Answered by Shruti Srivastva * On 10 July 2020:01:38:38 PM

**Question 38.** **Asked on :**10 July 2020:01:34:13 PM

Can we add a velocity vector to a displacement vector?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

No, only vectors representing physical quantities of same nature can be added together.

*-Answered by Shruti Srivastva * On 10 July 2020:01:35:20 PM

**Question 39.** **Asked on :**10 July 2020:01:30:49 PM

Under what condition will the direction of sum and diffrence of two vector be same?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

When the two vectors are unequal in magnitude and are in the same direction.

*-Answered by Shruti Srivastva * On 10 July 2020:01:33:02 PM

**Question 40.** **Asked on :**10 July 2020:01:28:38 PM

Can two vector of different magnitudes be combined to give resultant?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

No.

*-Answered by Shruti Srivastva * On 10 July 2020:01:30:12 PM

**Question 41.** **Asked on :**10 July 2020:01:27:36 PM

Is pressure a vector quantity?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

No

*-Answered by Shruti Srivastva * On 10 July 2020:01:28:24 PM

**Question 42.** **Asked on :**10 July 2020:01:26:27 PM

Is time a vector quantity?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

No.

*-Answered by Shruti Srivastva * On 10 July 2020:01:27:10 PM

**Question 43.** **Asked on :**10 July 2020:01:23:55 PM

State the essential condition for the addition of vectors?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

The essential condition for the addition of vectors is that they must represent the physical quantity of some nature.

*-Answered by Shruti Srivastva * On 10 July 2020:01:24:56 PM

**Question 44.** **Asked on :**10 July 2020:01:20:12 PM

Why cannot be vectors added algebraicall?

*-Added by Shruti Srivastva * **Physics** » **Motion In A Plane**

**Answer:**

A part from magnitude, the vectors also have direction, so they cannotnbe added algebrically.

*-Answered by Shruti Srivastva * On 10 July 2020:01:22:43 PM

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