1
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

A particle of mass $$m$$ is moving in a horizontal circle of radius $$r$$ under a centripetal force given by $$\left(-k / r^2\right)$$, where $$k$$ is a constant. Then

A
the total energy of the particle is $$(-k / 2 r)$$
B
the kinetic energy of the particle is $$(k / r)$$
C
the potential energy of the particle is $$(k / 2 r)$$
D
the kinetic energy of the particle is $$(-k / r)$$
2
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

A plane glass mirror of thickness $$3 \mathrm{~cm}$$ of material of $$\mu=\frac{3}{2}$$ is silvered on the back surface. When a point object is placed $$9 \mathrm{~cm}$$ from the front surface of the mirror, then the position of the brightest image from the front surface is

A
9 cm
B
11 cm
C
12 cm
D
13 cm
3
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

A skylab or mass $$m \mathrm{~kg}$$ is first launched from the surface of the earth in a circular orbit of radius $$2 R$$ (from the centre of the earth) and then it is shifted from this circular orbit to another circular orbit of radius $$3 R$$. The minimum energy required to place the lab in the first orbit and to shift the lab from first orbit to the second orbit are

A
$$\frac{3}{4} m g R, \frac{m g R}{6}$$
B
$$\frac{3}{4} m g R, \frac{m g R}{12}$$
C
$$m g R, m g R$$
D
$$2 m g R, m g R$$
4
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

A train has to negotiate a curve of radius $$400 \mathrm{~m}$$. By how much should the outer rail be raised with respect to the inner rail for a speed of $$48 \mathrm{~km} / \mathrm{h}$$ ? The distance between the rails is $$1 \mathrm{~m}$$.

A
1.5 cm
B
2.5 cm
C
3.5 cm
D
4.5 cm
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