Answer:
s=800 m
Explanation:
Given that,
Acceleration of a runner, a = 4 m/s²
Time, t = 20 seconds
We need to find the distance covered by her. Initially, she was at rest. It means its initial velocity is equal to 0. So, using second equation of motion as follows :
Herre, u = 0
So, she will cover a distance of 800 m.
C.
hope that helped you!!!
Typically a scaffolding has two ropes to support it. One
on the left most side while the other one is on the right most side. Based on
equilibrium rule, the summation of forces must be 0. The downward force is the
weight of person and scaffolding, while the upward force are the tensions on
the two ropes, hence:
Weight person + Weight scaffolding = 2 * Tension
500 N + Weight scaffolding = 2 * 400 N
Weight scaffolding = 300 N
freezing
During freezing, the temperature of a substance remains constant while the particles in the liquid form a crystalline solid. Because particles in a liquid have more energy than particles in a solid, energy is released during freezing. This energy is released into the surroundings.
Answer:
486nm
Explanation:
in order for an electron to transit from one level to another, the wavelength emitted is given by Rydberg Equation which states that
Hence the photon must possess a wavelength of 486nm in order to send the electron to the n=4 state