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3 years ago

A piece of cork has a volume of 10 cm cube. find the net force on the cork if it is completely submerged and then released.

Physics

1 answer:

Ronch [10]3 years ago

8 0

Answer:

Explanation:

The force required to submerge something underwater can be found from Archimedes principle:

FB=pwVg

Where FB is the buoyant force, pw is the density of water (1g/ml), V is volume of the water displaced, and g is gravity. The key here is V. The volume of water displaced by the cork is equal to the volume of cork. Therefore, the required force is

F=1 g/cm³ x 10 cm³ x 9.8 m/s²= 98 N

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A container is filled to a depth of 25.0 cm with water. On top of the water floats a 32.0-cm-thick layer of oil with specific gr

den301095 [7]

Answer:

the answer is 32.0-25.0=7

Explanation:

the absolute pressure at the bottom of the container is 7

6 0

3 years ago

If car A passes car B, then car A must be

Tcecarenko [31]

Answer:

B. moving faster than car B, but not necessarily accelerating

Explanation:

Velocity is the speed of something. So car A's velocity is greater than car B but does not mean car A is accelerating.

4 0

3 years ago

At the end of the movie Titanic, Rose lies on a piece of furniture, floating in the ocean, and Jack drowns. A common objection p

julsineya [31]

Answer:

If jack is in the piece of furniture it would submerge.

Explanation:

The piece of furniture would submerge if the weight applied on the furniture is greater than the maximum buoancy force the water can provide.

maximum buoacy force = density of liquid × volume submerged× acceleration due to gravity.

= $1025\times v\times 9.8$

v = area × thickness of pine

$1.5\times 5\times 10^{-2}$

= 0.075 $m^{3}$

therefore buoancy force = 1025×0.075×9.8 N

= 753.375 N

weight of rose alone = 46×9.8 N = 450.8 N

weight of jack alone = 58×9.8 = 568.4 N

weight of pine = density of pine × volume of pine

= 350 × 0.075= 26.25 N

weight of pine + weight of rose = 450.8+26.25=477.05 N

weight of pine + rose + jack = 477.05 + 568.4 = 1045.45 N

therefore if jack is in the piece of furniture it would submerge.

4 0

3 years ago

A particular roller coaster has a mass of 3500 kg, a height of 4.0, and a velocity of 12m/s. What is the potential energy? If ne

Evgesh-ka [11]

$▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪$

Gravitational Potential Energy of an object is calculated by formula ~

$\large\boxed{\sf P = mgh}$

where,

m = mass of the object = 3500 kg

g = Acceleration due to gravity = 12 m/s²

h = height attained by the object = 4 m

Now, let's calculate its potential energy ~

$3500 \times 10 \times 4$

$140000 \: \: joules$

$140 \: \: kj$

5 0

3 years ago

the radius of earth is about 6.38 x10^3 km. A 7.20 x10^3 N spacecraft travels away from earth. What is the weight of the spacecr

statuscvo [17]

Answer:

$1796.65\ \text{N}$

Explanation:

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

w = Weight of spracecraft at the surface = $7.2\times10^3\ \text{N}$

m = Mass of spracecraft

R = Radius of Earth = $6.38\times10^3\ \text{km}$

h = Elevation = $6.38\times10^3\ \text{km}$

G = Gravitational constant = $6.674\times 10^{-11}\ \text{Nm}^2/\text{kg}^2$

M = Mass of Earth = $5.972\times 10^{24}\ \text{kg}$

$w=mg\\\Rightarrow m=\dfrac{w}{g}\\\Rightarrow m=\dfrac{7.2\times 10^3}{9.81}\\\Rightarrow m=733.94\ \text{kg}$

From the gravitational law we have

$w'=\dfrac{GMm}{(r+h)^2}\\\Rightarrow w'=\dfrac{6.674\times10^{-11}\times 5.972\times 10^{24}\times 733.94}{(6.38\times10^6+6.38\times10^6)^2}\\\Rightarrow w'=1796.65\ \text{N}$

The weight of the spacecraft at the given height is $1796.65\ \text{N}$

8 0

3 years ago