<span> the </span>law of conservation of energy<span> states that the total </span>energy<span> of an isolated system remains constant it would be said to be conserved over time. </span>Energy<span> can neither be created nor destroyed but then rather, it transforms from one form to another.
hope this can help you ^_^</span>
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Answer:
2E
Explanation:
The electric field inside a charged, nonconducting sphere is given by
(1)
where
k is the Coulomb's constant
Q is the total charge on the sphere
r is the distance from the centre of the sphere
R is the radius of the sphere
In this problem, the magnitude of the electric field at r = R/4 is E, so we can write:
Then, we want to calculate the magnitude of the electric field at a distance of
Substituting into (1), we find:
Therefore, the electric field at R/2 is twice the electric field at R/4.
Answer:
Zero
Explanation:
As it is stationary, it implies a non moving force, on top of the fact that the ramp is horizontal, the force of static friction has to be zero.
Answer:
–2.5 m/s²
Explanation:
From the question given above, the following data were obtained:
Initial velocity (u) = 25 m/s
Final velocity (v) = 0 m/s
Time (t) = 10 s
Acceleration (a) =?
Acceleration can simply be defined as the rate of change of velocity with time. Mathematically, it can be expressed as:
a = (v – u) /t
Where:
a => is the acceleration
v => is the final velocity
u => is the initial velocity
t => is the time.
With the above formula, we can obtain the acceleration of the car as follow:
Initial velocity (u) = 25 m/s
Final velocity (v) = 0 m/s
Time (t) = 10 s
Acceleration (a) =?
a = (v – u) /t
a = (0 – 25) /10
a = –25 / 10
a = –2.5 m/s²
The acceleration of the car is –2.5 m/s². The negative sign indicate that the car is decelerating i.e coming to rest.
