A. silver and gold. Both silver and gold are elements. b is not correct because CO2 is a compound, not a mixture, and c is incorrect because salt and pepper are not elements.
From the transitions of ice to water, water to steam, steam to water,
or water to ice, mass doesn't change.
Answer:
Kinetic energy of mass A = 20 J
Kinetic energy of mass B = 40 J
Explanation:
Lets take final speed of mass A = v
The final speed of mass B = v'
mass of A= m
mass of B = m'
m = 2 m'
There is no any external force so the linear momentum will be conserve.
Pi = pf
0 = m v + m ' v'
0 = 2 m ' v +m ' v'
v ' = - 2 v
Now from energy conservation
1/2 k x²=1/2 m v² + 1/2 m' v'²
60 = 1/2 m v² + 1/2 m' v'²
m v² + m' v'² = 120
2 m ' (-v'/2)² + m' v'² = 120
m ' v'²/2 + m' v'² = 120
m' v '² = 80
m =2 m' and v ' = - 2 v
So
m/2 ( 4 v²) = 80
m v ²=40
So the kinetic energy of mass A= 1/2 m v² = 20 J
Kinetic energy of mass B = 1/2 m' v'² = 40 J
Answer:
<em>If you’ve ever received a high energy bill, it might be time to learn how to read your meter, so that you can begin saving.
</em>
Explanation:
<em>Every appliance and electronic device in your home adds to your bill. By calculating your own tab, you can find out which appliances are costing you much more than they should. This awareness can both lower your bill and reduce your carbon footprint at the same time.
</em>
D. Electromagnetic
I hope this helps!
