NEET Physics: Questions 156 - 160 of 2098

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Question number: 156

» Kinematics » Motion in a Plane

MCQ▾

Question

A body is thrown at an angle 30° to the horizontal with the velocity of 30 m/s. After 1 sec, its velocity will be (in m/s) (g = 10 m/s2)

Choices

Choice (4) Response

a.

10√7

b.

√10

c.

100√7

d.

700√10

Question number: 157

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

Using rectangular co-ordinates and the unit vectors i and j, the vector expression for the acceleration a will be (r is a position vector) -

Choices

Choice (4) Response

a.

-2r 2

b.

- 2 r

c.

ω2r2

d.

r 2

Question number: 158

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A ball is thrown from the top of a tower with an initial velocity of 10 m/s at an angle of 30° above the horizontal. It hits the ground at a distance of 17.3 m from the base of the tower. The height of the tower (g = 10 m/s2) will be

Choices

Choice (4) Response

a.

10m

b.

110m

c.

100m

d.

12m

Question number: 159

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

The angular velocity of a particle is given by co = 1.51 - 3t 2 + 2, the time when its angular acceleration decreases to be zero will be -

Choices

Choice (4) Response

a.

0.25 sec

b.

25 sec

c.

1.2 sec

d.

12 sec

Question number: 160

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The vertical section of a road over a canal bridge in the direction of its length is in the form of circle of radius 8.9 meter. Find the greatest speed at which the car can cross this bridge without losing contact with the road at its highest point, the center of gravity of the car being at a height h = 1.1 meter from the ground. (Take g = 10 m/sec2)

Choices

Choice (4) Response

a.

7 m/s

b.

10 m/s

c.

5 m/s

d.

13 m/s

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