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sergeinik [125]
3 years ago
9

As an ice cube melts, its molecules

Physics
1 answer:
fomenos3 years ago
3 0

Answer:

A. absorb heat energy and move farther apart

Explanation:

The answer is A since when a ice cube takes in heat, it changes form and melts down to a liquid : water.

The molecules in water are farther apart since they are moving around alot but can be contained in a container.

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Two ice skaters, each with a mass of 72.0 kg, are skating at 5.45 m/s when they collide and stick together. If the angle between
Rudiy27

Answer:

The skater 1 and skater 2 have a final speed of 2.02m/s and 2.63m/s respectively.

Explanation:

To solve the problem it is necessary to go back to the theory of conservation of momentum, specifically in relation to the collision of bodies. In this case both have different addresses, consideration that will be understood later.

By definition it is known that the conservation of the moment is given by:

m_1v_1+m_2v_2=(m_1+m_2)v_f

Our values are given by,

m_1=m_2=72Kg

As the skater 1 run in x direction, there is not component in Y direction. Then,

Skate 1:

v_{x1}=5.45m/s

v_{y1}=0

Skate 2:

v_{x2} = 5.45*cos105= -1.41m/s

v_{y2} = 5.45*sin105 = 5.26m/s

Then, if we applying the formula in X direction:

m_1v_{x1}+m_2v_{x2}=(m_1+m_2)v_{fx}

75*5.45-75*1.41=(75+75)v_{fx}

Re-arrange and solving for v_{fx}

v_{fx}=\frac{4.04}{2}

v_{fx}=2.02m/s

Now applying the formula in Y direction:

m_1v_{y1}+m_2v_{y2}=(m_1+m_2)v_{fy}

0+75*5.25=(75+75)v_{fy}

v_{fy}=\frac{5.25}{2}

v_{fy}=2.63m/s

Therefore the skater 1 and skater 2 have a final speed of 2.02m/s and 2.63m/s respectively.

6 0
3 years ago
Small evidence is also called what?
siniylev [52]
Small evidence is also called trace evidence.
4 0
3 years ago
How might burning fossil fuels affect the composition of gases in the atmosphere?
elena-14-01-66 [18.8K]
No "might<span>". The amount of CO2 in the </span>atmosphere<span> HAS gone up since the start of industrialisation as the result of </span>burning fossil fuels<span>.</span>
5 0
3 years ago
The force that gravity exerts on an object is called _____. weight volume density mass
uysha [10]

Answer:

Weight

Explanation:

8 0
3 years ago
Read 2 more answers
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
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