School XI

Workout 4 – Motion within a Plane

Physics

Question 5. 1:

State, for each in the following physical quantities, whether it is a scalar or a vector: volume, mass, speed, acceleration, density, range of moles, velocity, angular regularity, displacement, slanted velocity.

Solution:

Scalar: Volume, mass, speed, density, range of moles, angular frequency Vector: Acceleration, speed, displacement, angular velocity A scalar amount is specific by its magnitude simply. It does not have got any way associated with that. Volume, mass, speed, density, number of moles, and angular frequency are a few of the scalar physical quantities.

A vector quantity is usually specified simply by its magnitude as well as the way associated with it. Acceleration, speed, displacement, and angular speed belong to this category.

Question 4. 2:

Select the two scalar quantities inside the following list:

force, slanted momentum, operate, current, geradlinig momentum, electric field, typical velocity, permanent magnet moment, comparative velocity.

Answer

Work and current will be scalar amounts.

Work done is given by the appear in product of force and displacement. Since the dot product of two quantities is always a scalar, work can be described as scalar physical quantity. Current is referred to only by simply its degree. Its direction is not really taken into account. Therefore, it is a scalar quantity.

Query 4. several:

Pick out the only vector variety in the following list:

Temperatures, pressure, behavioral instinct, time, power, total route length, energy, gravitational potential, coefficient of friction, fee.

Answer

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Class XI

Exercise some – Movement in a Planes

Physics

Impulse

Impulse is given by the merchandise of power and time. Since force is a vector quantity, it is product as time passes (a scalar quantity) provides a vector variety.

Question some. 4:

Condition with factors, whether the pursuing algebraic procedures with scalar and vector physical quantities are significant:

(a) adding any two scalars, (b) adding a scalar into a vector of the identical dimensions, (c) multiplying virtually any vector simply by any scalar, (d) growing any two scalars, (e) adding virtually any two vectors, (f) adding a component of the vector to the same vector. Answer:

(a) Meaningful

(b) Not Significant

(c) Important

(d) Meaningful

(e) Important

(f) Important

Explanation:

(a)The addition of two scalar quantities is definitely meaningful only when they both equally represent precisely the same physical variety.

(b)The addition of a vector quantity having a scalar variety is not really meaningful. (c) A scalar can be increased with a vector. For example , power is increased with time to offer impulse.

(d) A scalar, irrespective of the physical quantity this represents, could be multiplied with another scalar having the same or diverse dimensions.

(e) The addition of two vector amounts is meaningful only if they both signify the same physical quantity.

(f) A component of a vector could be added to a similar vector as they both have precisely the same dimensions.

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Class XI

Exercise 5 – Action in a Planes

Physics

Issue 4. five:

Read every statement listed below carefully and state with reasons, if it is true or false: (a) The size of a vector is always a scalar, (b) each element of a vector is always a scalar, (c) the total way length is always equal to the magnitude in the displacement vector of a compound. (d) the average speed of the particle (defined as total path size divided when taken to cover the path) is either better or corresponding to the magnitude of normal velocity in the particle above the same span of time, (e) Three vectors not lying in a aircraft can...

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power, period, physical, same, just, vector, volume, scalar, velocity, quantities, angular, magnitude, displacement, meaningful, meaningful meaningful, acceleration-
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