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ElenaW [278]
3 years ago
6

A student wished to add a new experiment to Chapter 2 by investigating whether the mass of water changes when it is heated. The

mass of a beaker containing a sample of water at 20°C was 109.44 g. After heating the sample to 60°C, the com- bined mass of the beaker and water was 109.08 g. Do these results contradict the law of conservation of mass? Explain your reasoning.
Physics
1 answer:
Valentin [98]3 years ago
7 0

Answer:

mass conservation is valid for all closed system where the mass will remain in the system always

Explanation:

Conservation of mass is applicable everywhere in classical physics

Here we can also apply mass conservation as we know that the initially the beaker and its water content is having total mass of 109.44 g

m_1 = 109.44 g

now when we heated it to higher temperature then its total mass will be lesser than the initial mass this is because some of the water may evaporate from the system.

Here if we repeat the same experiment with closed boundary then we can see that total mass will be conserved

So here mass conservation is valid for all closed system where the mass will remain in the system always

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Which of the following is an example of how humans can increase biodiversity?
Leto [7]

Answer:

The following is an example of how humans can increase biodiversity

Provide Wildlife Corridors and Connections Between Green Spaces

Use Organic Maintenance Methods and Cut Back On Lawns

Use a Native Plant Palette and Plant Appropriately

Utilize Existing Green Space Connections

Be Mindful of Non-Native Predators

7 0
3 years ago
Jose has a solid green ball. Which color(s) of light does this ball reflect?
lorasvet [3.4K]
If the ball is green, then it is absorbing all the colors of light except green. This means that it is reflecting or denying the absorption of green light, that is why the ball is green. Therefore, your answer would be B.

Hope I helped :)

About 85% sure on this one. 
4 0
3 years ago
Read 2 more answers
Two positive charges ( 8.0 mC and 2.0 mC) are separated by 300 m. A third charge is placed at distance r from the 8.0 mC charge
WINSTONCH [101]

Answer:

r=200m

Explanation:

From the question we are told that:

Charges:

Q_1=8.0mC

Q_2=2.0mC

Q_3=8.mC

Distance d=300m

Generally the equation for Force is mathematically given by

F=\frac{kq_1q_2}{r^2}

Therefore

F_{32}=F_{31}

\frac{q_2}{(300-r)^2}=\frac{q_1}{r^2}

\frac{2*10^{-3}}{(300-r)^2}=\frac{8*10^{-3}}{r^2}

r=2(300-r)

r=200m

8 0
2 years ago
SOMEONE PLEASE HELP ME URGENTLY <br> WILL MARK AS BRAINLIEST
max2010maxim [7]

Explanation:

I am not sure about this

4 0
3 years ago
Nerve impulses in a human body travel at a speed of about 100 m/s. Suppose a man accidentally stubs his toe. About how much time
alexandr1967 [171]

Answer:

t = 0.018 s  

Explanation:

given,

nerve impulse in human body travel at a speed of  = 100 m/s

height of the man = 1.80 m

time taken by the impulse to travel from foot to brain = ?

distance = speed × time                      

1.80 = 100 × t                                              

t =\dfrac{1.80}{100}                                    

t = 0.018 s                            

hence, the time taken by the nerve to reach brain from toe is 0.018 s

5 0
3 years ago
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