1
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

A quarter horse power motor runs at a speed of 600 rpm. Assuming 60% efficiency, the work done by the motor in one rotation is

A
7.46 J
B
74.6 J
C
111.9 J
D
11.19 J
2
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

A particle of mass m is projected with a velocity u making an angle $$\theta$$ with the horizontal. The magnitude of angular momentum of the projectile about the point of projection when the particle is at its maximum height is

A
0
B
$$\frac{m u \sin ^2 \theta \cos \theta}{2 g}$$
C
$$\frac{2 m u^2 \cos ^2 \theta \sin \theta}{g}$$
D
$$\frac{m u^3 \sin ^2 \theta \cos \theta}{2 g}$$
3
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

A sphere of mass m is attached to a spring of spring constant k and is held in unstretched position over an inclined plane as shown in the figure. After letting the sphere go, find the maximum length by which the spring extends, given the sphere only rolls.

AP EAPCET 2021 - 19th August Evening Shift Physics - Rotational Motion Question 7 English

A
$$\frac{2 m g \sin \theta}{k}$$
B
$$\frac{k}{2 m g \sin \theta}$$
C
$$\frac{2 \sin \theta}{k m g}$$
D
$$\frac{2 m g \cos \theta}{k}$$
4
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

A girl of mass M stands on the rim of a frictionless merry-go-round of radius R and rotational inertia I, that is not moving. She throws a rock of mass m horizontally in a direction that is tangent to the outer edge of the merry-go-round. The speed of the rock, relative to the ground is v. Afterwards, the linear speed of the girl is

A
$$\frac{m v R^2}{I+M R^2}$$
B
$$\frac{(m+M) v R^2}{I+M R^2}$$
C
$$\frac{m v R^2}{I+(M+m) R^2}$$
D
$$\frac{m v R^2}{I+(M-m) R^2}$$
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