To solve this problem it is necessary to apply the concepts related to the Period based on the length of its rope and gravity, mathematically it can be expressed as

g = Gravity
L = Length
T = Period
Re-arrange to find the gravity we have

Our values are given as

Replacing we have



Therefore the correct answer is C.
That's true.
Netwon's second law states that the resultant of the forces F acting on a body is equal to the product between its mass m and its acceleration a:

This means that if the net force acting on an object is different from zero (term on the left), than the acceleration of the object (term on the right) must be different from zero as well, and therefore the body is accelerating.
In particular, both F and a in the equation are vectors: this means that if the acceleration is positive, F and a have the same direction. In this problem, the acceleration is positive (because the object is speeding up), therefore the force and the acceleration have same direction.
Answer:
1003.9 Nm²/C
Explanation:
Parameters given:
Radius of sphere, r = 1.88 m
Electric field at surface of sphere, E = 22.6 N/C
Electric Flux, Φ, is given as:
Φ = E * A
Where A = Surface area
Surface Area of sphere = 4 * pi * r²
= 4 * pi * 1.88²
= 44.4 m²
Φ = 22.6 * 44.4
Φ = 1003.9 Nm²/C
Radio waves are a type of electromagnetic wave that can travel when there is no medium, whereas sound waves are a type of mechanical wave that cannot travel if there is no medium