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Which are the forms of heat you know. Explain them briefly including an example

The most common ways to transfer heat are conduction and convection. Conduction is heat transfer through mollecular collision. The slower speed particles, or colder particles will increase their kinetic ener...
JA
Answered by Joao A. • Physics tutor
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what is the total resistance of 2 resistors each with resistance 2 ohms in parallel?

1/R t = 1/R 1 + 1/R 2 The equation for resistors in parrallel. If R 1 and R 2 are both 2 ohms then 1/R t = 1/2 +1/2 = 1 so R t = 1 ohm. Note: Don't forget the units at the end.
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Answered by Hermione W. • Physics tutor
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A person weighs 620N on Earth. The gravitational constant on Mars is 3.8m/s^2. How much does this person weigh on Mars?

If the person weighs 620N on Earth, their mass is 620/9.8=63.3kg on Earth. Therefore applying F=ma they must weigh 63.3*3.8=240N on Mars.
TM
Answered by Tomas M. • Physics tutor
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State Newton's 2nd Law, and use this explain the vertical motion of a parachutist in the descent from her plane to Earth.

Newton's second law: F net = m. a . The net force (vector) on an object is directly proportional to the product of its mass (scalar) and its acceleration (vector). At the instant the parachutist leaves the p...
AB
Answered by Akash B. • Physics tutor
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What is the difference between a vector and a scalar quantity?

A scalar quantity is one that has a magnitude (size) only, and no associated direction in which that size 'points'. A good example of a scalar is temperature, because temperature has a size (for example 20 d...
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Answered by Frazer N. • Physics tutor
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