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3 years ago

A rocket engine applies a force of 50000 N for a distance of 20 m. how much work is done?

Physics

1 answer:

zlopas [31]3 years ago

6 0

Answer:

1000000Nm

Explanation:

W=force*distance

50000*20

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Planets are not uniform inside. Normally, they are densest at the center and have decreasing density outward toward the surface.

SSSSS [86.1K]

Answer:

a = 9.94 m/s²

Explanation:

given,

density at center= 1.6 x 10⁴ kg/m³

density at the surface = 2100 Kg/m³

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$\rho(r) = ar^2 - br^3$

r is the radius of the spherical shell

dr is the thickness

volume of shell

$dV = 4 \pi r^2 dr$

mass of shell

$dM = \rho(r)dV$

$\rho = \rho_0 - br$

now,

$dM = (\rho_0 - br)(4 \pi r^2)dr$

integrating both side

$M = \int_0^{R} (\rho_0 - br)(4 \pi r^2)dr$

$M = \dfrac{4\pi}{3}R^3\rho_0 - \pi R^4(\dfrac{\rho_0-\rho}{R})$

$M = \pi R^3(\dfrac{\rho_0}{3}+\rho)$

we know,

$a = \dfrac{GM}{R^2}$

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$a =\pi RG(\dfrac{\rho_0}{3}+\rho)$

$a =\pi (6.674\times 10^{-11}\times 6.38 \times 10^6)(\dfrac{1.60\times 10^4}{3}+2.1\times 10^3)$

a = 9.94 m/s²

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3 years ago

The mass of an object is 4kg and it has a density of 5gcm^-3. what is the volume

Andru [333]

Answer:

density = mass/ volume

5=4000/ volume

volume=4000/5

volume=800 cm^-3

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3 years ago

Which of the following materials offer the least electrical resistance? Pure water, wood, salt water, glass

Vanyuwa [196]

Salt water offers the least electrical resistance.

<u>Explanation:</u>

Least electrical resistance indicates that any material which readily allows the electric current through itself, and shows more conductivity.

Here pure water doesn't contain any ions, so it is a bad conductor.

Wood and glass are also bad conductors of electricity.

Salt water contains ions, which conducts electricity which means it shows least electrical resistance.

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3 years ago

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lana66690 [7]

Answer:

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Explanation:

Since a train with negative velocity and positive acceleration, this means its acceleration is in opposite direction with the velocity. As time progress, this opposite direction would decrease the velocity magnitude, making the train slowing down.

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3 years ago

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11111nata11111 [884]

Answer:

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2 years ago

A rocket engine applies a force of 50000 N for a distance of 20 m. how much work is done?​

A rocket engine applies a force of 50000 N for a distance of 20 m. how much work is done?