All categories

3 years ago

Which of these is an example of physical change

Chemistry

2 answers:

Yuki888 [10]3 years ago

6 0

I would say d sorry if it is wrong

Julli [10]3 years ago

5 0

Answer:

it is A mark me big brain pls

Explanation:

You might be interested in

The quantity of heat required to change the temperature of 1 g of a substance by 1 c is defined as

slega [8]

I think it's calorie
Hope this helps

6 0

3 years ago

Which situation is the best analogy for the doppler effect?

Phoenix [80]

If you want an example then a car passing by a standing man is the best one !!

3 0

3 years ago

Read 2 more answers

PLEASE HELP ME

vichka [17]

Light moves in a straight line except at surfaces between different transparent materials, where its path bends.

4 0

3 years ago

In which block of the periodic table is uranium (U) found?

Maurinko [17]

Uranium is in the "f" block, because it's external electron configuration is $5d^4$

6 0

3 years ago

Read 2 more answers

Consider two concentric spheres whose radii differ by t = 1 nm, the "thickness" of the interface. At what radius (in nm) of sphe

Gala2k [10]

Answer:

Radius of the interior sphere = 3.847 nm

Explanation:

The volume of the shell (Vs) is equal to the difference of the volume of the outer sphere (Vo) and the volume of the inner sphere (Vi). Then:

$V_s=V_o-V_i=V_i\\V_o=2*V_i\\$

If we express the radius of the outer sphere (ro) in function of the radius of the inner sphere (ri), we have (e being the shell thickness):

$r_o=r_i+e$

The first equation becomes

$\frac{4 \pi}{3}*r_o^{3} = 2 * \frac{4 \pi}{3}*r_i^{3} \\\\\frac{4 \pi}{3}*(r_i+e)^{3} = 2 * \frac{4 \pi}{3}*r_i^{3} \\\\(r_i+e)^{3} = 2 *r_i^{3} \\\\(r_i^{3}+3r_i^{2}e+3r_ie^{2}+e^{3})=2r_i^{3}\\\\-r_i^{3}+3r_i^{2}e+3r_ie^{2}+e^{3}=0\\\\-r_i^{3}+3r_i^{2}+3r_i+1=0$

To find ri that satisfies this equation we have to find the roots of the polynomial.

Numerically, it could be calculated that ri=3.847 nm satisfies the equation.

So if the radius of the interior sphere is 3.847 nm, the volume of the interior sphere is equal to the volume of the shell of 1nm.

8 0

3 years ago