3 years ago

The buoyant force acting on an object is always equal to

Physics

2 answers:

slavikrds [6]3 years ago

8 0

The correct choice is C .

Jet001 [13]3 years ago

5 0

I think the correct answer is C as well

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Alenkasestr [34]

Answer:

the work againts gravity is zero (0)

Explanation:

This is because the work is always done, by a force that acts parallel in the direction of the displacement of the body.

In this case, the gravity and the weight of the bag is not acting in the direction of the displacement, therefore there is no work done.

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3 years ago

If an R = 1-kΩ resistor, a C = 1-μF capacitor, and an L = 0.2-H inductor are connected in series with a V = 150 sin (377t) volts

fgiga [73]

Answer

given,

R = 1-kΩ = 1000 Ω

C = 1-μF

L = 0.2-H

V = V_max sin( ω t)

comparing

V = 150 sin ( 377 t)

ω = 377

$\chi_c = \dfrac{1}{\omega C}$

$\chi_c = \dfrac{1}{377 \times 1 \times 10^{-6}}$

$\chi_c = 2652.5\Omega$

$\chi_L =377 \times 0.2$

$\chi_L =75.4\ \Omega$

Impedance,

$Z = \sqrt{R^2+(\chi_L-\chi_c)^2}$

$Z = \sqrt{1000^2+(75.4 -2652.5)^2}$

Z = 2764.3 Ω

now,

V_{max} = 150 V

$I_{max} = \dfrac{V}{Z}$

$I_{max} = \dfrac{150}{2764.3}$

$I_{max} = 0.0543$

$I_{max} = 54.3\ mA$

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3 years ago

Determine the kinetic energy of a girl of mass 40kg running with a velocity of 3m/s

kotegsom [21]

0.5mv^2
0.5 times 40 times 3^2
The kinetic energy is 180

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According to the big bang theory, the universe was once a very C. hot and hostile place, and it expanded rapidly. This rapid expansion was the very reason it eventually cooled down and eventually got to its present state where all the planets and galaxies and what not were created.

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3 years ago

When do you produce more pressure on the ground...standing or laying down?

ycow [4]

When you are Standing you produce more pressure on the ground

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