Home
Class 12
PHYSICS
A steel drill making 180 rpm is used to ...

A steel drill making 180 rpm is used to drill a hole in a block of steel. The mass of the steel block and the drill is 180 gm. If the entire mechanical work is used up in producing heat and the rate of raise in temperature of the block and the drill is 0.5 °C/s. Find
(a) the rate of working of the drill in watts, and
(b) the torque required to drive the drill. Specific heat of steel `= 0.1 and J = 4.2 J//cal`. Use : `P = tau omega`

A

`P= 37.8 W `

B

`p= 9 W`

C

`tau = 2N.m`

D

`tau = 6.3 n .m`

Text Solution

Verified by Experts

The correct Answer is:
A, C
Promotional Banner

Topper's Solved these Questions

  • THE FIRST LAW OF THERMODYNAMICS

    RESNICK AND HALLIDAY|Exercise PRACTICE QUESTIONS ( LINKED COMPREHENSION )|15 Videos

  • THE FIRST LAW OF THERMODYNAMICS

    RESNICK AND HALLIDAY|Exercise PRACTICE QUESTIONS ( INTEGER TYPE )|3 Videos

  • THE FIRST LAW OF THERMODYNAMICS

    RESNICK AND HALLIDAY|Exercise PRACTICE QUESTIONS ( SINGLE CORRECT CHOICE TYPE )|48 Videos

  • TEMPERATURE, ZEROTH LAW OF THERMODYNAMICS AND THERMAL EXPANSION

    RESNICK AND HALLIDAY|Exercise PRACTICE QUETIONS (Integer Type)|4 Videos

  • THE KINETIC THEORY OF GASES

    RESNICK AND HALLIDAY|Exercise PRACTICE QUESTIONS|72 Videos

Similar Questions

Explore conceptually related problems

A drilling machine of power P watts is used to drill a hole in copper block of mass M kg. If the spcific heat of coper is sjkg^(-1) .^(@)C^(-1) and 40% of the powder is lost due to theating of the machine, the rise in the temperature of the block in T seconds will be (in .^(@)C )

Describe a seed -drill.

Mock drill.

What are the advantages of using seeds drills?