Answer:
Speed, 
Explanation:
Given that,
Distance covered by the electron, d = 32 cm = 0.32 m
Time, t = 2 ns
We need to find the speed of an electron. Speed is equal to distance covered divided by time. So,
So, the speed of the electron is 
.
Answer:
2.01
Explanation:
First, we need to find the centripetal acceleration.
We're given that the merry go round rotates 1 revolution in 2.09 seconds. Converting to rpm, we know that it rotates 30 revolution per minute
Now this speed gotten in rpm will be converted to m/s, to ease the calculation
30 rpm = πdN/60 m/s
30 rpm = (3.142 * 4 * 30)/60
30 rpm = 377.04/60
30 rpm = 6.284 m/s
a(c) = v²/r
a(c) = 6.284²/2
a(c) = 39.49 / 2
a(c) = 19.74 m/s²
F = ma
F = 50 * 19.74
F = 987 N
Also, Normal Force, F(n) =
F(n) = mg
F(n) = 50 * 9.81
F(n) = 490.5
We then use this to find the coefficient of static friction, μ
μ = F/F(n)
μ = 987 / 490.5
μ = 2.01
Incomplete question.The complete question is
A 0.27 kg rock is projected from the edge of the top of a building with an initial velocity of 11.7 m/s at an angle 58 above the horizontal.
Due to gravity, the rock strikes the ground at a horizontal distance of 15.9 m from the base of the building. How tall is the building? Assume the ground is level and that the side of the building is vertical. The acceleration of gravity is 9.8 m/s
Answer:
Total height of the building =6.78 m
Explanation:
v = 11.7 m/s
Horizontal component of velocity = v x cos 58 = 11.7*cos 58 = 6.2 m/s
Total time of flight = Horizontal distance / Horizontal component of velocity = 15.9 / 6.2 = 2.56 sec.
Vertical component of velocity = v x sin 58 = 11.7 x sin 58 = 9.92 m/s
Time taken to reach maximum height = Vertical component of velocity / g = 9.92 / 9.81 = 1.01 sec.
Hence, Time taken to reach ground from maximum height = 2.56 - 1.01 = 1.55 sec.
Hence, Maximum height from ground = 0.5 x g x t^2 = 0.5 x 9.81 x 1.55^2 = 11.78 m
Maximum height from the top of building = 0.5 x 9.81 x 1.01^2 = 5 m
Hence, Total height of the building = 11.78 m - 5 m = 6.78 m
Explanation:
Since the equation is not given in this case, you can follow this explanation to balance it up.
A balanced chemical equation is one in which the law of conservation of matter is strictly obeyed.
According to the laws, we know that the total mass of the reacting substances must be equal to that of the product.
To do this, coefficients are usually assigned to chemical species.
In order to know the right coefficient one can use;
- A trial by error method of inspecting and putting the appropriate coefficients in front of the formula of reactants or products.
- A mathematical method in which simple equations are derived can be used.
learn more:
Balanced equation brainly.com/question/2612756
#learnwithBrainly
Responda:
9.2s
Explicação:
Dada a pergunta:
Em quanto tempo o um paraquedista, em queda livre, atinge a velocidade de 90 m / s?
Em queda livre; a aceleração de um corpo = 9,8m / s ^ 2
Portanto, quanto tempo leva para atingir uma velocidade de 90 m / s
Da primeira equação de movimento:
v = u + em
v = velocidade final; u = velocidade inicial; a = aceleração; t = tempo
90 = 0 + 9,8t
90 = 9,8t
t = 90 / 9,8
t = 9,18s = 9,2 s
