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3 years ago

Why doesn’t a rocket in space need to use its engine to keep it moving??? Please help!

2 answers:

Studentka2010 [4]3 years ago

7 0

Every action produces an equal and opposite reaction. When a rocket shoots fuel out one end, this propels the rocket forward

kupik [55]3 years ago

7 0

Answer:

Every action produces an equal and opposite reaction. When a rocket shoots fuel out on end, this will propel the roclet forward and no air is required. Roclets do not stop and neither do spacecrafts but they do reduce their speed. Objects will slow down in space but they won't necessarily stop. So the answer to your question is once the rocket is launched from Earth, it will have other substances to keep it moving.

You're welcome :)

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Which produces more energy? Nuclear fission or nuclear fission?

erastovalidia [21]

Answer:

Nuclear fission

Explanation:

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3 years ago

A wave on the ocean has a wavelength of 200 m, the wave is a deep-water wave __________. only if the water is deeper than 200 m

klasskru [66]

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4 years ago

When a second student joins the first, the height difference between the liquid levels in the right and left pistons is 35 cm .

sleet_krkn [62]

Answer:

The mass of the second student is 20.180 Kg

Explanation:

When the mass is added on one piston, it causes a change in pressure on other piston.

The change in mass is calculated using the formula,

Δm=ρhA/g

The calculated radius of piston is 0.46 m.

Given h=35 cm= 0.35 m.

Assume ρ=850 kg/m^3

So Δm=850*0.35*π*(0.46)^2/9.8

Δm= 20.180 Kg

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6 0

2 years ago

Read 2 more answers

Why measurement standards are necessary

ivanzaharov [21]

Answer:

standard unit of measurement provides a reference point by which objects of weight, length or capacity can be described.

6 0

4 years ago

What is the energy of a 4kg apple that is sitting on a 2 m high tree branch?

miv72 [106K]

78.4 joules is the energy of a 4 kg apple that is sitting on a 2 m high tree branch.

<u>Explanation: </u>

When an apple falls to the ground from a tree, its positional energy (stored as potential gravitational energy) turns into kinetic energy, during a fall. Chemical potential energy is chemical energy because it is food and potential energy as it can still have ability to move. So, in the given case, kinetic energy is zero.

To find potential energy, the formula would be

$\text { potential energy }(P . E)=m \times g \times h$

Where, given

m – Mass – 4 kg

$g-\text { Earth'sgravity }-9.8 \mathrm{m} / \mathrm{s}^{2}$ (Known value)

h – Height - 2 m

Substitute these values, we get

$P . E=4 \times 9.8 \times 2=78.4 \text { joules }$

8 0

3 years ago