Answer:
The closer together two objects are, the stronger the electrical force between them.
Explanation:
A: The positive charge if the protons in the nucleus equals the negative charge in the electron cloud.
Protons are positive, electrons are negative, and neutrons have no charge/are neutral
Answer:
(a) F = 42.86N
(c) Ff = –2.25N
(d) Ff = –4.50N
Explanation:
(a) mass of stone m = 20kg
initial speed of stone u = 0m/s
final speed of stone v = 3.0m/s
Time interval = t = 1.4s
From Newtown's second law of motion
F = m(v – u)/t = 20(3.0 – 0)/ 1.4 = 42.86N
(c) v = 0 (comes to rest) u = 3m/s
v² = u² + 2aS
S = 40m
0² = 3³ + 2a×40
80a = –9
a = –9/80 = -0.1125
Once the stone is launched the only force acting on it is Ff the frictional force,
So
Ff = ma = 20×(–0.1125)
Ff = –2.25N
Negative sign shows the force is acting in a direction opposite the direction of motion.
(d) If the stone's mass is now 40kg
Ff = 40(–0.1125) = –4.45N
3 times 6= 18. The average speed is 19 mph.
hope this helps!