Why does a buoyant force act on every object in a fluid?

Physics

1 answer:

Georgia [21]3 years ago

8 0

Answer:

The buoyant force comes from the pressure exerted on the object by the fluid. Because the pressure increases as the depth increases, the pressure on the bottom of an object is always larger than the force on the top - hence the net upward force.

Explanation:

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An automobile engine takes in 4000 j of heat and performs 1100 j of mechanical work in each cycle. (a) calculate the engine's ef

Semmy [17]

(a) The efficiency of an engine is defined as the ratio between the work done by the engine and the heat it takes in:
$\eta= \frac{W}{Q_{in}}$
The engine in this problem does a work of $W=1100 J$ and it takes in $Q_{in}=4000 J$ of heat, therefore its efficiency is
$\eta= \frac{1100 J}{4000 J}=0.275 = 27.5 \%$

(b) The heat taken by the machine is 4000 J; of this amount of heat, only 1100 J are converted into useful work. This means that the rest of the heat is wasted. Therefore, the wasted heat is the difference between the heat in input and the work done by the engine:
$Q_{wasted}=Q_{in}-W=4000 J-1100 J=2900 J$

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3 years ago

Voltage needed to raise current to 3.75a using 20,20,200 resistor set

Varvara68 [4.7K]

<u>Answer:</u> The voltage needed is 35.7 V

<u>Explanation:</u>

Assuming that the resistors are arranged in parallel combination.

For the resistors arranged in parallel combination:

$\frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}$