3 years ago

Identify three specific situations in which machines make work easier.

1 answer:

5 0

Construction, like building a home/building, digging, like in a mine, and opening a soda can, where the part to open is a lever.

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Which statement best describes the density of the outer planets?

gavmur [86]

Answer:

Saturn is mainly composed of the lightest two gases known, hydrogen and helium. It is the only planet in our solar system whose density is less than water.

Explanation:

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4 years ago

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How many seconds will elapse between seeing lightning and hearing the thunder if the lightning strikes 1mi (5280 ft) away and th

alexandr1967 [171]

Answer:

t = 4.58 s

Explanation:

In this problem, we need to find the time elapse between seeing lightning and hearing the thunder if the lightning strikes 1mi (5280 ft) away and the air temperature is 90.0°F.

T = 90.0°F = 32.2 °C

The speed of sound at temperature T is given by :

v = (331.3 +0.6T)

Put T = 32.2°C

So,

v = (331.3 +0.6(32.2))

= 350.62 m/s

We have, distance, d = 1 mile = 1609.34

So,

$t=\dfrac{d}{v}\\\\t=4.58\ s$

So, the required time is equal to 4.58 seconds.

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3 years ago

A 66.5kg astronaut is doing a repair in space on the orbiting space station. She throws a 2.30kg tool away from her at 3.10m/s r

MrRa [10]

Answer:

Explanation:

mass of astronaut, M = 66.5 kg

mass of tool, m = 2.3 kg

velocity of tool, v = 3.10 m/s

Let the velocity of astronaut is V.

(A) According to the conservation of moemntum

Momentum of astronaut = Momentum of tool

M x V = m x v

66.5 x V = 2.3 x 3.10

V = 0.107 m/s

(B) The direction of motion of astronaut is opposite to the direction of motion of tool.

6 0

3 years ago

How can Ethan best defend his conclusion?

nirvana33 [79]

The defense that Ethan should choose is going to depend heavily
on what his conclusion is.

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4 years ago

A toy rocket is launched straight up by using a spring. The rocket is initially pressed down on the spring so that the spring is

Delvig [45]

Answer:

B.6.86 m

Explanation:

Given that

Compression in spring ,x= 9 cm

Spring constant ,K= 830 N/m

Mass of the rocket ,m= 50 g = 0.05 kg ( 1 kg = 1000 g)

Now by applying energy conservation

$\dfrac{1}{2}Kx^2=mgh$

$h=\dfrac{1}{2\times mg}kx^2$

Now by putting the values ( we are taking g= 9.81 m/s²)

$h=\dfrac{1}{2\times 9.81\times 0.05}\times 830\times 0.09^2$

h= 6.853 m

Therefore the answer is B.

B.6.86 m

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3 years ago