WB JEE 2023 | Work Power & Energy Question 4 | Physics

A uniform rope of length 4 m and mass 0.4 kg is held on a frictionless table in such a way that 0.6 m of the rope is hanging over the edge. The work done to pull the hanging part of the rope on to the table is, (Assume g = 10 m/s$$^2$$)

0.36 J

0.24 J

0.12 J

0.18 J

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

The kinetic energy (E_k) of a particle moving along X-axis varies with its position (X) as shown in the figure. The force acting on the particle at X = 10 m is

WB JEE 2022 Physics - Work Power & Energy Question 6 English

5$$\widehat i$$ N

0 N

97.5$$\widehat i$$ N

$$-$$5$$\widehat i$$ N

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

WB JEE 2021 Physics - Work Power & Energy Question 8 English

A block of mass m slides with speed v on a frictionless table towards another stationary block of mass m. A massless spring with spring constant k is attached to the second block as shown in figure. The maximum distance, the spring gets compressed through is

$$\sqrt {{m \over k}} v$$

$$\sqrt {{m \over {2k}}} v$$

$$\sqrt {{k \over m}} v$$

$$\sqrt {{k \over {2m}}} v$$

WB JEE 2020

MCQ (Single Correct Answer)

-0.5

Consider an engine that absorbs 130 cal of heat from a hot reservoir and delivers 30 cal heat to a cold reservoir in each cycle. The engine also consumes 2 J energy in each cycle to overcome friction. If the engine works at 90 cycles per minute, what will be the maximum power delivered to the load? [Assume the thermal equivalent of heat is 4.2 J/cal]

816 W

819 W

627 W

630 W

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