Question

LYNOMIALS
33
FWExERc
EXERCISE 2.2
Find the zeroes of the following quadratic polynomials and verify the relationship between
(ii) 4s2 - 4s + 1
the zeroes and the coefficients.
(i) r2 - 2x - 8
(iv) 4u2 +
(iii) 6x2 -3-7x
(vi) 3x2 - X-4​

Answer 1

Step-by-step explanation:

Explanation:

Question

A force of 5 N acting on a body at an Angle of 30° with horizontal direction displaces it horizontally through a distance of 6 m Calculate the work done.

\rule{250}{2}

We know : Work Done = Fs × cosθ

Where

F = Force

s = Displacement

θ = Angle Formed

Work Done = Fs × cosθ

⇒ Work Done = F × s × cosθ

⇒ Work Done = 5 × 6 × cosθ

⇒ Work Done = 30 × cosθ

Note : We will Have θ = 30° as it is given Angle Formed is equal to 30°

⇒ Work Done = 30 × cos 30°

⇒ Work Done = 30 × \rm{\dfrac{\sqrt{3}}{2}}

2

3

⇒ Work Done = 15 × √3

⇒ Work Done = 15 × 1.732

⇒ Work Done = 25.98 JExplanation:

Question

A force of 5 N acting on a body at an Angle of 30° with horizontal direction displaces it horizontally through a distance of 6 m Calculate the work done.

\rule{250}{2}

We know : Work Done = Fs × cosθ

Where

F = Force

s = Displacement

θ = Angle Formed

Work Done = Fs × cosθ

⇒ Work Done = F × s × cosθ

⇒ Work Done = 5 × 6 × cosθ

⇒ Work Done = 30 × cosθ

Note : We will Have θ = 30° as it is given Angle Formed is equal to 30°

⇒ Work Done = 30 × cos 30°

⇒ Work Done = 30 × \rm{\dfrac{\sqrt{3}}{2}}

2

3

⇒ Work Done = 15 × √3

⇒ Work Done = 15 × 1.732

⇒ Work Done = 25.98 J