Ok, a couple of things have to be accounted for here. First, since the block is moving relative to the wall we have to use the
kinetic coefficient of friction, 0.40. The second consideration is that since the block is moving at a constant velocity, the acceleration is
zero. This means, by Newton's second Law, that the net force is zero. So the force of gravity must be equal to the friction force of the wall resisting its fall. This friction force is the product of the normal force (which we are seeking) and the kinetic coefficient of friction. We can then set these two forces equal:
Answer:
Hello There!
It is Speed.
Because in the question it is said that at which speed car is travelling.
Speed is a scalar quantity.
If it is velocity then first know this that it is a vector quantity.
It must include both magnitude and direction.
If it is velocity then it would be 40 mph east or west or north or south.
<h2>I hope it is helpful to you...</h2><h3>Cheers!_____________</h3>
Answer:
360 J/kg/°C
Explanation:
Heat lost by metal = heat gained by water
-m₁ C₁ (T − T₁) = m₂ C₂ (T − T₂)
-(0.059 kg) C (27.4°C − 221°C) = (0.409 kg) (4186 J/kg/°C) (27.4°C − 25°C)
(11.4 kg°C) C = 4109 J
C = 360 J/kg/°C
Answer:
C. Sunlight to electricity
Explanation:
Photo voltaic cells covert sunlight to the electricity. It absorbs the light from the sun and use that sunlight to create electric current. The number of photo voltaic cells are connected together in a solar panel to generate enough electricity to power up a home.
The solid can melt down to a liquid like state, and if you keep applying heat, it would eventually become a gas state.
