Laws of Motion (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 5 - 7 of 20

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Question number: 5

» Laws of Motion » Equilibrium of Concurrent Forces

Appeared in Year: 2012

MCQ▾

Question

Two blocks (1 and 2) of equal mass m are connected by an ideal string (see figure below) over a frictionless pulley. The blocks are attached to the ground by springs having spring constants k1 and k2 such that k1 > k2.

Two blocks of equal mass attached with pulley

Two Blocks of Equal Mass Attached With Pulley

In figure two blocks (1 and 2) of equal mass m are connected by an ideal string over a frictionless pulley.

Initially, both springs are unstretched. The block 1 is slowly pulled down a distance x and released. Just after the release the possible value of the magnitudes of the acceleration of the blocks a1 and a2 can be –

Choices

Choice (4) Response

a.

Either (a1=a2=(k1k2)x2m) or (a1=a2=(k1k2)x(k1+k2)mg)

b.

Either (a1=a2=(k1+k2)x2m) or (a1=k1xmganda2=k2xm+g)

c.

(a1=a2=(k1k2)x2m)only

d.

(a1=a2=(k1+k2)x2m)only

Question number: 6

» Laws of Motion » Impulse

Appeared in Year: 2014

MCQ▾

Question

A uniform thin rod of length 2L and mass m lies on a horizontal table. A horizontal impulse J is given to the rod at one end. There is no friction. The total K. E. of the rod just after the impulse will be:

Choices

Choice (4) Response

a.

6J2m

b.

J22m

c.

2J2m

d.

J2m

Question number: 7

» Laws of Motion » Law of Conservation of Linear Momentum

Appeared in Year: 2013

MCQ▾

Question

A bullet of mass m is fired horizontally into a large sphere of mass M and radius R resting on a smooth horizontal table.

A bullet of mass m is fired horizontally into a large sphere.

A Bullet of Mass M Is Fired Horizontally Into a Large Sphere.

In figure a bullet of mass m is fired horizontally in to a large sphere of mass M and radius r resting on a smooth horizontal table.

The bullet hits the sphere at a height h from the table and sticks to its surface. If the sphere starts rolling without slipping immediately on impact, then

Choices

Choice (4) Response

a.

hR=4m+3M2(m+M)

b.

hR=10m+7M5(m+M)

c.

hR=4m+3Mm+M

d.

hR=m+3Mm+2M

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