1
COMEDK 2024 Morning Shift
+1
-0

The power of a gun which fires 120 bullet per minute with a velocity $$120 \mathrm{~ms}^{-1}$$ is : (given the mass of each bullet is $$100 \mathrm{~g}$$)

A
86400 W
B
14.4 kW
C
1.44 kW
D
1220 W
2
COMEDK 2023 Morning Shift
+1
-0

A particle is projected at an angle $$30^{\circ}$$ with horizontal having kinetic energy $$K$$. The kinetic energy of the particle at highest point is.

A
$$\frac{1}{2} K$$
B
$$\frac{3}{4} K$$
C
$$\frac{3}{8} K$$
D
$$\frac{5}{8} K$$
3
COMEDK 2023 Morning Shift
+1
-0

A long spring, when stretched by a distance $$x$$, has potential energy $$U$$. On increasing the stretching to $$n x$$, the potential energy of the spring will be

A
$$\frac{U}{n}$$
B
$$nU$$
C
$$n^2 U$$
D
$$\frac{U}{n^2}$$
4
COMEDK 2023 Evening Shift
+1
-0

If reaction is $$\mathrm{R}$$ and coefficient of friction is $$\mu$$, what is work done against friction in moving a body by distance $$\mathrm{d}$$ ?

A
$$\mu \mathrm{Rd}$$
B
$$(\mu \mathrm{Rd}) / 2$$
C
$$2 \mu \mathrm{Rd}$$
D
$$(\mu \mathrm{Rd}) / 4$$
EXAM MAP
Medical
NEET