Multiple choice questions, only one answer is correct for each question. Please

Question

Multiple choice questions, only one answer is correct for each question. Please answer the question carefully, they are very important.

1.An example of a vector quantity is

speed

momentum

distance

length

2.What"is"the"equation"below"known"as:"

q=hA(Ts-T?)

Fouriers"law"

Newtons"Law of cooling"

Stefan"Boltsmann s"Law"

First "Law of Thermodynamics

3.An increase in the speed of fluid implies the increase in ________________.

Both its dynamic pressure and kinetic energy.

Dynamic pressure, but not kinetic energy.

Kinetic energy, but not dynamic pressure.

None of the above.

4.Newton's 3rd law states

For every action there is an unequal and opposite reaction

For every action there is no reaction

For every action there is an equal and opposite reaction

For every action there is an equal and same direction reaction.

5.Superconductivity

expected in homes to generate electricity by 2020

impractical as of today

used in Tesla cars

wears a cape

Explanation / Answer

1) Momentum is a vector quantity. Momentum is mass multiplied by velocity. Mass is a scalar, velocity is a vector. So momentum is a vector quantity.

2) fourier's law

3) dynamic pressure = rho*v2 / 2 , Kinetic energy = mv2 / 2 So as the speed of fluid increases, both the dynamic pressure and kinetic energy increases.

4) For every action, there is an equal and opposite reaction.

F = -F

5) not sure but i have read somewhere that tesla motor is using superconductors to improve the charging time

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