Kinematics (NEET Physics): Questions 51 - 55 of 229

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Question number: 51

» Kinematics » Motion in a Straight Line

MCQ▾

Question

The motion of a body is given by the equation dv (t) /dt = 6.0 - 3v (t), where v (t) is speed in m/s and t in sec.

If body was at rest at t = 0

Choices

Choice (4) Response

a.

The speed varies with the time as v (t) = 2 (1 – e -5t) m/s

b.

The magnitude of the initial acceleration is 6.0 m/s2

c.

The speed is 0.1 m/s when the acceleration is half the initial value

d.

The terminal speed is 4 m/s

Passage

When an airplane flies, its total velocity with respect to the ground is v total = v plane + v wind’ where v plane denotes the plane’s velocity through motionless air,

And v wind denotes the wind’s velocity. Crucially, all the quantities in this equation are vectors. The magnitude of a velocity vector is often called the “speed. ”

Consider an airplane whose speed through motionless air is 100 meters per second (m/s). To reach its destination, the plane must fly east.

The “heading” of a plane is in the direction in which the nose of the plane points. So, it is the direction in which the engines propel the plane.

Question number: 52 (1 of 3 Based on Passage) Show Passage

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

Let denote the answer of above question. The plane has what speed with respect to the ground?

Choices

Choice (4) Response

a.

100m/scos

b.

(100 m/s) cos

c.

(100 m/s) sin

d.

100m/ssin

Question number: 53 (2 of 3 Based on Passage) Show Passage

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The pilot maintains an eastward heading while a 20 m/s wind blows northward. The plane’s velocity is deflected from due east by what angle?

Choices

Choice (4) Response

a.

sin120100

b.

tan120100

c.

cos120100

d.

Question does not provide sufficient data or is vague

Question number: 54 (3 of 3 Based on Passage) Show Passage

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

If the plane has an eastward heading, and a 20 m/s wind blows towards the southwest, then the plane’s speed is -

Choices

Choice (4) Response

a.

more than 100 m/s

b.

more than 80 m/s but less than 100 m/s

c.

80 m/s

d.

100 m/s

Question number: 55

» Kinematics » Scalars and Vectors » Scalar and Vector Products

MCQ▾

Question

Two forces Fl = 5i + l0j - 20k and F2 = 10i - 5j - l5k act on a single point. The angle between Fj and F2 is nearly

Choices

Choice (4) Response

a.

30°

b.

90°

c.

45°

d.

60°

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