1
COMEDK 2024 Evening Shift
+1
-0

When water falls from a height of $$80 \mathrm{~m}$$ at the rate of $$20 \mathrm{~kg} \mathrm{~s}^{-1}$$ to operate a turbine the losses due to frictional force are $$20 \%$$ of input energy. How much power is generated by the turbine?

A
12.8 KW
B
62.5 KW
C
25.6 KW
D
21.6 KW
2
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
3
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
$$\frac{5}{8} K$$
4
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
$$\frac{U}{n^2}$$
EXAM MAP
Medical
NEET