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Lesechka [4]
2 years ago
14

A 75 kg astronaut floating in space throws a 5 kg rock at 5 m/sec. How fast does the astronaut move backwards?

Physics
1 answer:
JulijaS [17]2 years ago
4 0

Answer:

The astronaut will get a velocity 0.064ms−1 opposite to the direction of the object.

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How much heat h1 is transferred to the skin by 25.0 g of steam onto the skin? the latent heat of vaporization for steam is l=2.2
elena-s [515]
The heat transferred by the steam to the skin is given by
Q=m L_v
where
m is the mass of the steam
L_v is the latent heat of vaporization.

In our problem, the mass of the steam is (converting into kg)
m=25.0 g=0.025 kg
while the latent heat of vaporization of the steam is
L_v = 2.256 \cdot 10^6 J/kg
Substituting into the previous formula, we find the heat transferred to the skin:
Q=m L_v = (0.025 kg)(2.256 \cdot 10^6 J/kg)=56400 J = 2.56 \cdot 10^4 J
8 0
3 years ago
27. (a) What magnification is produced by a 0.150 cm focal length microscope objective that is 0.155 cm from the object being vi
denpristay [2]

Answer:

magnification = - 30

overall magnification = -240

Explanation:

given data

Focal length of microscope objective f = 0.150 cm

Object distance from microscope objective do = 0.155 cm

magnification by eyepiece = 8 ×

to find out

What magnification is produced  and overall magnification

solution

we consider here  Image distance from microscope objective is =  di

so that

Magnification produced by objective will be = - \frac{di}{do}

so we find here  di by given equation that is

\frac{1}{do} +\frac{1}{di} = \frac{1}{f}     ..................1

\frac{1}{di} = \frac{1}{0.150} - \frac{1}{0.155}

di = 4.65 cm

so that magnification by object will be

magnification = - \frac{di}{do}

magnification = - \frac{4.65}{0.155}

magnification = - 30

and

overall magnification will be

overall magnification = magnification by objective × magnification by eyepiece   ........................2

overall magnification = -30 × 8

overall magnification = -240

7 0
3 years ago
How can u use physics in the real world
Blizzard [7]
Physics can be used in a variety of ways, a specific example would be rollercoaster. Physics can be used to determine the speed at which a rollercoaster can travel without going off the rails or when it needs to begin to slow down to make a sharp turn.
3 0
3 years ago
Please help. i'm horrible at science
Alla [95]

Answer:

7 s / 3600 s/hr = 0.001944444444... = 0.0019 hr

a = (vf - vi) / t = (70 - 0) / 0.0019 = 36000 km/hr²

6 0
3 years ago
Use the terms in the word box to label each class of lever and the diagram.
balu736 [363]
1st class lever the Fulcrum is between the load and the effort
2nd class lever the load is between the effort and the fulcrum
3rd class lever the effort is between the fulcrum and the load.
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2)3rd class lever
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3 0
3 years ago
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