1
IIT-JEE 1994
MCQ (Single Correct Answer)
+1
-0.25
A particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration $${a_c}$$ is varying with time t as $${a_c}$$ = k2rt2 where k is a constant. The power delivered to the perticles by the force acting on it is:
A
$$2\pi m{k^2}{r^2}t$$
B
$$m{k^2}{r^2}t$$
C
$${{\left( {m{k^4}{r^2}{t^5}} \right)} \over 3}$$
D
zero
2
IIT-JEE 1980
MCQ (Single Correct Answer)
+2
-0.5
If a machine is lubricated with oil
A
the mechanical advantage of the machine increases
B
the mechanical efficiency of the machine increases
C
both its mechanical advantage and efficiency increases
D
its efficiency increases, but its mechanical advantage decreases
3
IIT-JEE 1980
MCQ (Single Correct Answer)
+2
-0.5
Two masses of 1gm and 4 gm are moving with equal kinetic energies. The ratio of the magnitude of their linear momentum is
A
4 : 1
B
$$\sqrt 2 :1$$
C
$$1:2$$
D
1 : 16
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