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svetlana [45]
3 years ago
7

Noah drops a rock with a density of 1.73 g/cm3 into a pond. Will the rock float or sink? Explain your answer.

Physics
1 answer:
wel3 years ago
5 0

Answer:

Sink

Explanation:

The normal density of water is 1 g/cm3.  Since the rock has a higher density of 1.72g/cm3, it will sink in water.

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Gallium is a solid metal at room temperature, but it will melt to a liquid in your hand. the melting point of gallium is 85.6 f.
Nimfa-mama [501]

Fahrenheit  =  85.6°F

Celsius  =  (5/9) (Fahrenheit - 32)

Celsius  =  (5/9) (85.6 - 32)

Celsius  =  (5/9) (53.6)

<em>Celsius  =  29.78°C</em>

Kelvin  =  Celsius + 273.15

Kelvin  =  29.78 + 273.15

<em>Kelvin  =  302.93K  </em>

5 0
2 years ago
A motorcyclist drove 7 km at 57km/h and then another 7 km at 81 km/h. What was the average speed? ​
alex41 [277]

<u>Answer:</u>

<em>The average speed of the car is 66.9 km/h</em>

<u>Explanation:</u>

Here distance covered with the speed <em>57 km/h=7 km  </em>

distance covered with the speed of <em>81 km/h=7 km</em>

<em>Average speed is equal to the ratio of total distance to the total time. </em>

<em>total distance= 7 + 7= 14 km  </em>

<em>time= \frac{distance}{speed} </em>

<em>time taken to cover the first 7 km= 7/57 h  </em>

<em>time taken to cover the second part of the journey = 7/81 h </em>

<em>average speed =  14/(7/57+7/81)=(14 \times 57 \times 81)/945=66.9 km/h</em>

<u><em>Shortcut: </em></u>

<em>When equal distances are covered with different speeds average speed=2 ab/(a+b) where a and b are the variable speeds in the phases. </em>

7 0
3 years ago
Can the enzyme DNA polymerase be used to break down lactose
Lady_Fox [76]
Short answer: No

DNA polymerase is an enzyme responsible for copying DNA strands. Lactase is an enzyme responsible for breaking down lactose.
6 0
3 years ago
A gas in a closed container is heated with 10J of energy, causing the lid of the container to rise 2m with 3N of force. What is
AveGali [126]

Explanation:

For this problem, use the first law of thermodynamics. The change in energy equals the increase in heat energy minus the work done.

ΔU=Q−W

We are not given a value for work, but we can solve for it using the force and distance. Work is the product of force and displacement.

W=FΔx

W=3N×2m

W=6J

Now that we have the value of work done and the value for heat added, we can solve for the total change in energy.

ΔU=Q−W

ΔU=10J−6J

ΔU=4J

Answer is 4J

i think this may help you very much

3 0
3 years ago
What is static electricity and how does it differ from current electricity
sp2606 [1]

Answer:

1. Static electricity is caused by the build up of electrical charges on the surface of objects, while current electricity is a phenomenon from the flow of electrons along a conductor. 2. When objects are rubbed, a loss and/or gain of electrons occurs, which results in the phenomenon of static electricity.

Explanation:

3 0
3 years ago
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