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Strike441 [17]
3 years ago
6

What is the difference between a chemical change and a physical change? *

Physics
1 answer:
slavikrds [6]3 years ago
7 0

Answer:

I do belive that it is B hrs cn I an gn

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Which two pieces of evidence most directky support the idea that all matter in the universe began as a sibgke point of energy.
Aleks04 [339]

Answer:

YOUR ANSWER IS GIVEN BELOW:

Explanation:

The abundance of helium in the universe and the redshift of light from the galaxies.

8 0
2 years ago
Describe two experiments to determine the speed of propagation of a transverse wave on a rope. You have the following tools to u
AnnZ [28]

Answer:

#See solution for details.

Explanation:

1.

Tools:stopwatch, \ meter \ stick, \ mass \ measuring \ scale , \ force \ measuring  \ device.

Experiment \ 1:Calculate the speed of the wave using the time,t it takes to travel along the rope. Rope's length,L is measured using the meter stick.

-Attach one end of rope to a wall or post, shake from the unfixed end to generate a pulse. Measure the the time it takes for the pulse to reach the wall once it starts traveling using the stopwatch.

-Speed of the pulse can then be obtained as:

v=\frac{L}{t}

Experiment \ 2: Apply force of known value to the rope then use the following relation equation to find the speed of a pulse that travels on the rope.

v=\sqrt{\frac{F}{\mu}}\ ,\mu=\frac{m}{L}

-Use the measuring stick and measuring scale to determine L,m values of the rope then obtain \mu.

-Use the force measuring constant to determine F. These values can the be substituted in Experiment \ 1 to obtain v.

4 0
3 years ago
Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds. What is the work done
blagie [28]

Answer:

Work done W =1406.25 J

Explanation:

Work done on a body can be calculated using newton's 2nd laws:

F=ma

\Rightarrow a=\frac{F}{m}

Hence acceleration of the block is given by:

\Rightarrow a=\frac{25}{2}=12.5m/s^2

Displacement of the object is given by:

\Rightarrow S=ut+\frac{1}{2}at^2

Substitute the values

\Rightarrow S=0*3+\frac{1}{2}(12.5)3^2

\Rightarrow S=56.25 m

Now work done is given by:

 W=F.S

W = 25×56.25

W =1406.25 J

3 0
2 years ago
If the number of troughs that pass a point in a given time increases, what has increased?
Lerok [7]
Wave length i think                                               hope it helps
8 0
3 years ago
Read 2 more answers
Gravity is a force that pulls things
Katena32 [7]

Answer:

down and towards it

Explanation:

just because it is man

8 0
3 years ago
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