Kinematics-Motion in a Straight Line (NEET Physics): Questions 38 - 40 of 47

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Question number: 38

» Kinematics » Motion in a Straight Line

MCQ▾

Question

P, Q and R are three coplanar forces acting at a point and are in equilibrium. Given P = 1.9318 kg wt, sin Q = 0.9659, the value of R is (in kg wt)

Choices

Choice (4) Response
a.

2

b.

1

c.

0.9659

d.

0.5

Question number: 39

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A man can swim with velocity v relative to water. He has to cross a river of width d flowing with a velocity u (w > v). The distance through which he is carried downstream by the river is x. Which of the following statements is correct?

Choices

Choice (4) Response
a.

If he crosses the river in minimum time x = du/v

b.

x cannot be less than du/v

c.

Force to be minimum he has to swim in a direction making an angle

of π/2- sin -1 (v/u) with the direction of the flow of water.

d.

x will be maximum if he swims in a direction making

an angle of π/2 + sin-1 - 1 (v/u) with direction of the flow of water.

Question number: 40

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A metal sphere is hung by a string fixed to a wall. The sphere is pushed away from the wall by a stick. The forces acting on the sphere are shown in the second diagram. Which of the following statements is wrong?

 metal sphere fixed at wall

Metal Sphere Fixed at Wall

metal sphere fixed at wall

In above fig we shows that metal sphere fixed at the wall, as we apply some force on it then motion is taking place, here angle is θ .

Choices

Choice (4) Response
a.

T + P + W = 0

b.

T 2 + P 2 + W 2 = 0

c.

T2 = P2 + W2

d.

p = w tanθ

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