Which one of the following is the best conductor of heat?
Mercury, being a metal in liquid form, has a relatively high thermal conductivity for a liquid, around 8.3 W/m·K.
Water: While water can conduct heat, it is not as efficient as metals. Water is a less efficient conductor compared to metals.
Wood: Wood is a poor conductor of heat and is often used as an insulator to prevent heat transfer.
Leather: Like wood, leather is also a poor conductor of heat and is used for insulation purposes.
Which law explains colours of stars based on temperature?
The three modes of heat transfer are:
Which of the following is correct about Specific heat capacity of water?
Efficiency of Carnot engine can be increased by:
The best conductor of heat among the following is
A graph of Fahrenheit temperature versus Celsius temperature is a straight line, whose intercept is _____.
A point mass has a velocity v = (1.0 m/s) i + (3.0 m/s) j, at a certain instant. At the same instant, it experiences a force F = - (2.0 N) i + (4.0 N) j + (5.0 N) k. i, j and k are unit vectors along x-, y-, and z- axis, respectively. The power delivered by the force, at that instant is:
The position(x)-time(t) graph of a ball is a straight line inclined at an angle of 30° to the x-axis. The ball is moving with:
Mohan (mass 60 kg) runs up a flight of stairs having a rise of 5 m in 6 s. The average power supplied by him during run up is (take = 10 ):
