C involves sound waves not electromagnetic waves (light)
Answer:
Direction
Explanation:
Speed is a scalar quantity, that is, it has only magnitude
While velocity is a vector quantity, which has both direction and magnitude.
Velocity is also called speed with direction.
Hence, we need to know the direction in which the car is moving in order to know the velocity.
The answer is C -<span> The potential energy is increasing through steps A, B, & C and then decreases </span>
Answer:
Work done, W = 0 J
Explanation:
It is given that,
Weight of the bucket, W = F = 35 N
It is lifted vertically 3 m and then returned to its original position. We need to find the work gravity do on the bucket during this process.
Work done when the bucket is lifted vertically, W₁ = -mgh
Work done when the bucket returned to its original position, W₂ = +mgh
Net work done, W = W₁ + W₂
W = 0 J
So, the work done on the bucket is zero. Hence, this is the required solution.
Answer:
2. +0.2 C
Explanation:
When the two spheres touch, the total charge will be redistributed such that the two spheres are at same potential:
The potential can be rewritten as ratio between the charge on the sphere (Q) and the capacitance of the sphere (C):
Since the two spheres are identical, they have same capacitance:
So we can write
And since the total charge is
And this charge will be redistributed equally on the two spheres (), we have