Helium because it has 2/2 electrons already
Answer: - 30 miles / h^2
Explanation:
This problem requieres that you assume uniformly accelarated motion.
1) Data:
Vo = 60 miles / h
Vf = 30 miles / h
t = 12 min
a = ?
2) Formula:
Vf = Vo + at
3) Clear t:
a = [Vf - Vo] / t
4) convert t = 12 min to hours
t = 12 min * 1 h / 60 min = 0.2 h
5) Substitute the data into the formula
a = [30 miles/h - 60 miles/h]/0.2 h = - 30 miles / h^2
The negative sign means that the car decelerated.
Answer: - 30 miles / h^2
Answer:
a) v = 2.9 m / s, b) A = 0.350 m, c) v = 2.9 m / s, d) A = 1.00 m
Explanation:
The oscillatory motion is described by the expression
x = A cos (wt + Ф)
the wavelength which is the distance for the wave to repeat and the frequency which is the number of times a wave oscillates per unit of time
a) In this part they ask us for the speed of the wave.
Let's use the relationship between speed, wavelength and frequency
v = λ f
For the wavelength they indicate that the distance between two crest is 6.1 m
λ / 2 = 6.10
λ = 12.20 m
They give us the period of the wave is the time it takes to return to the same point, in this case they give half a period
A / 2 = 2.10
A = 4.20 me
f = 1 / t
f = ¼, 2
f = 0.238 Hz
let's calculate
v = 12.20 0.238
v = 2.9 m / s
b) the amplitude of the wave, is the distance from zero to some maximum
2A = 0.700
A = 0.350 m
c) the speed of the wave is not function of the amplitude, so the speed is the same
v = 2.9 m / s
d) the amplitude is
2A = 0.50
A = 1.00 m
Answer:
5.96 minutes
Explanation:
Two RSM students are standing 20ft
Speed of one student = 300 ft/min
Speed of other student = 200 ft/m
Time they run till they reach a distance of 3000 ft = x
Distance = Speed × time
∴ Time taken to reach a gap of 3000 ft is 5.96 minutes.
Answer:
B.X: 12 Y: 12 Z: 10
Explanation:
Ions are formed when an atom of an element that lacks stable configuration or octet configuration, looses or gains electrons to attain stability.
Magnesium atom contains 12 electrons, with an electron configuration of 2:8:2. Therefore, it requires to loose two electrons to attain stability, thus forming an ion. During ion formation, the number of protons and neutrons are not affected thus they do not change.
Therefore; Magnesium atom contain 12 electrons, 12 protons and 12 Neutrons. While magnesium atom contains 12 protons, 10 electrons, and 12 neutrons.