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3 years ago

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An example of an action and reaction is sitting on a chair. Your body pushes down on the chair because of the force of _ , and t

he chair pushes up on your body with equal force.

1 answer:

Gnesinka [82]3 years ago

4 0

The force of gravity

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You drop a steel ball bearing, with a radius of 2.40 mm, into a beaker of honey. Note that honey has a viscosity of 6.00 Pa/s an

Stells [14]

Answer:

The “terminal speed” of the ball bearing is 5.609 m/s

Explanation:

Radius of the steel ball R = 2.40 mm

Viscosity of honey η = 6.0 Pa/s

$\text { Viscosity has Density } \sigma=1360 \mathrm{kg} / \mathrm{m}^{3}$

$\text { Steel has a density } \rho=7800 \mathrm{kg} / \mathrm{m}^{3}$

$\left.\mathrm{g}=9.8 \mathrm{m} / \mathrm{s}^{2} \text { (g is referred to as the acceleration of gravity. Its value is } 9.8 \mathrm{m} / \mathrm{s}^{2} \text { on Earth }\right)$

While calculating the terminal speed in liquids where density is high the stokes law is used for viscous force and buoyant force is taken into consideration for effective weight of the object. So the expression for terminal speed (Vt)

$V_{t}=\frac{2 \mathrm{R}^{2}(\rho-\sigma) \mathrm{g}}{9 \eta}$

Substitute the given values to find "terminal speed"

$\mathrm{V}_{\mathrm{t}}=\frac{2 \times 0.0024^{2}(7800-1360) 9.8}{9 \times 6}$

$\mathrm{V}_{\mathrm{t}}=\frac{0.0048 \times 6440 \times 9.8}{54}$

$\mathrm{V}_{\mathrm{t}}=\frac{302.9376}{54}$

$\mathrm{V}_{\mathrm{t}}=5.609 \mathrm{m} / \mathrm{s}$

The “terminal speed” of the ball bearing is 5.609 m/s

7 0

3 years ago

A rocket is fired from rest from the ground (y = 0) at time t0 = 0 s. As the rocket is burning its fuel, it moves vertically upw

elixir [45]

Answer:

Explanation:

attached is the solution

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3 years ago

An adaptation of an animal in the desert might be to

expeople1 [14]

Keep cool by being active at night, whereas some other desert animals get away from the sun's heat by digging underground burrows.

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3 years ago

Which contributions did Johannes Kepler make? Check all that apply.

gayaneshka [121]

Answer:

Its 4,5,

Explanation:

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3 years ago

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The fourth harmonic on a string fixed at both ends shows

Charra [1.4K]

Answer:

I believe the answer is B) Two wavelengths

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3 years ago