Answer:
615 J
Explanation:
internal energy (U) = 504 J
heat lost (q) = 111 J = - 111 J (negative sign is because heat is lost)
work done = 222 J
what is the final energy in the system
total energy = final energy - initial energy
final energy = total energy + initial energy
where
initial energy = 504 J
total energy = 222 - 111 = 111 J
final energy = 504 + 111 = 615 J
Acceleration is the way the motion is changing.
Answer:
The power exerted by the student is 51.2 W
Explanation:
Given;
extension of the elastic band, x = 0.8 m
time taken to stretch this distance, t = 0.5 seconds
the spring constant, k = 40 N/m
Apply Hook's law;
F = kx
where;
F is the force applied to the elastic band
k is the spring constant
x is the extension of the elastic band
F = 40 x 0.8
F = 32 N
The power exerted by the student is calculated as;
P = Fv
where;
F is the applied force
v is velocity = d/t
P = F x (d/t)
P = 32 x (0.8 /0.5)
P = 32 x 1.6
P = 51.2 W
Therefore, the power exerted by the student is 51.2 W
<span>BAKING A CAKE </span>
Chemical
change is a process where a current substance changes or is made into a new
type of substance. Unlike the physical change, which is reversible. Chemical change stays into a its new form. Take for
instance these -physical change- examples, making ice cubes. The process involves solidification or freezing
where the water becomes ice or solid but when it melts back to its original or typical
form with respect to temperature, it’s still water. When the paper is cut into
pieces it isn’t burned or exposed to a stimuli that can trigger immediate
change in its composition. It’s still the same. On the contrary, baking a cake involves
these different compositions or substances –flour, egg, yeast and etc. that is
baked to a cake, a newly formed unified substance of all the included
ingredients.
