AIPMT 2009 | Work, Energy and Power Question 41 | Physics

An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

mv³

$${1 \over 2}m{v^2}$$

$${1 \over 2}{m^2}{v^2}$$

$${1 \over 2}m{v^3}$$

AIPMT 2009

MCQ (Single Correct Answer)

-1

A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be

2Mg/k

4Mg/k

Mg/2k

Mg/k

AIPMT 2009

MCQ (Single Correct Answer)

-1

A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? (g = 10 m/s²)

30 J

40 J

10 J

20 J

AIPMT 2008

MCQ (Single Correct Answer)

-1

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine ? (g = 10 m/s²)

12.3 kW

7.0 kW

8.1 kW

10.2 kW

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