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2 years ago

Which laboratory activity involves a chemical change?

Physics

2 answers:

Elza [17]2 years ago

6 0

A) leaving a copper penny in vinegar until it turns green

garri49 [273]2 years ago

6 0

Answer:

A on edg

Explanation:

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compute the electric field experienced by a test a charge q = +0.08µC from a source charge q = +15µC in a vacuum when the test c

Fudgin [204]

here is your answer hope it's helpful for you thankyou I

3 0

1 year ago

Consider two copper wires of the same length. One has twice the cross-sectional area of the other. How do the resistances of the

JulsSmile [24]

Answer: a) when the cross section is doubled the resultant resistence is a half. This means the thicker wire have half resistence than the thinner wire.

Explanation: In order to explain this behaviur we have to consider the expresion for the resistence which is given by:

$R=\frac{\epsilon o L}{A}$ where L and A are the length and the cross section for the wire, respectively.

From this expresssion we can conclude the above, this means

R=εo*L/A if A is now 2A we have

R' = εo*L/2*A= R/2

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2 years ago

Physics is explicitly involved in studying which of these activities?

kozerog [31]

C is the answer hope it help

6 0

2 years ago

A box is put on a scale that is adjusted to read zero when the box is empty. A stream of marbles is then poured into the box fro

nadya68 [22]

Answer:

$F_{net} = 49 N$

Explanation:

As we know that rate of marble that strike the target is given as

$R = 120 per s$

now we know that after t = 8 s total marbles that accumulated in the box is given as

$N = Rt$

$N = 120(8)$

$N = 960$

now total weight of the marbles is given as

$W = N(mg)$

$W = 960(4.5 \times 10^{-3})(9.81)$

$W = 42.37 N$

Now force due to impact of marble is given as

$F = \frac{dN}{dt}mv$

$v = \sqrt{2gh}$

$v = \sqrt{2(9.81)(7.80)} = 12.37 m/s$

now we have

$F = 120(4.5 \times 10^{-3})(12.37)$

$F = 6.68 N$

so total force on the box is given as

$F_{net} = W + F$

$F_{net} = 42.37 + 6.68$

$F_{net} = 49 N$

6 0

2 years ago

You are riding in a train that is traveling at

slamgirl [31]

7 and a half hours because if you multiply 120 by 8 you get 960 and if you multiply 120 by 7 you get 840. So it’ll take 7 full hours and 30 minutes to reach 950 km. Hope this helps and I’m sorry if it’s wrong I did my best :)

8 0

2 years ago