Answer:
100 m/s
Explanation:
We'll begin by converting 1 km to m. This can be obtained as follow:
1 km = 1000 m
Finally, we shall determine the final velocity of the car. This can be obtained as follow:
Initial velocity (u) = 0 m/s
Acceleration (a) = 5.0 m/s²
Distance (s) = 1000 m
Final velocity (v) =?
v² = u² + 2as
v² = 0² + (2 × 5 × 1000)
v² = 0 + 10000
v² = 10000
Take the square root of both side
v = √10000
v = 100 m/s
Therefore, the speed value of the car is 100 m/s.
Answer:
The most precise is 0.0034 m ⇒ 1st answer
Explanation:
<em>Lets revise the meaning of precise</em>
Precision is referred as the closeness of two measurements to one
another.
Highest number with significant digit is the most precise
Ex: <em>Highest significant </em>of optical instrument is the Wavelength of visible (red)
light = 0.00006 cm
Hence the <em><u>most precise</u></em> device for measuring length is the given optical
instrument
The difference between accuracy and precise
<em>Accuracy</em> is how close a value is to its true value
<em>Precision</em> is how repeatable a measurement is
We have three numbers
0.0034 m, 45.6 m, and 1234 m
The least precise is 1234 m
The most precise is 0.0034 m
Answer:
a= g = - 9.81 m/s2.
The following equations will be helpful:
a = (vf - vo)/t d = vot + 1/2 at2 vf2 = vo2 + 2ad
When you substitute the specific acceleration due to gravity (g), the equations are as follows:
g = (vf - vo)/t d = vot + 1/2 gt2 vf2 = vo2 + 2gd
If the object is dropped from rest, the initial velocity ("vi") is zero. This further simplifies the equations to these:
g = vf /t d = 1/2 gt2 vf2 = 2gd
The sign convention that we will use for direction is this: "down" is the negative direction. If you are given a velocity such as -5.0 m/s, we will assume that the direction of the velocity vector is down. Also if you are told that an object falls with a velocity of 5.0 m/s, you would substitute -5.0 m/s in your equations. The sign convention would also apply to the acceleration due to gravity as shown above. The direction of the acceleration vector is down (-9.81 m/s2) because the gravitational force causing the acceleration is directed downward.
hope this info helps you out!
Answer:
a) E = σ / 2 ε₀ =
Q / 2A ε₀, b) E = 2Q/A ε₀
Explanation:
For this exercise we can use Gauss's Law
Ф = E. dA = 
/ ε₀
Let us define a Gaussian surface as a cylinder with the base parallel to the plane. In this case, the walls of the cylinder and the charged plate have 90 degrees whereby the scalar product is zero, the normal vector at the base of the cylinder and the plate has zero degrees whereby the product is reduced to the algebraic product
Φ = E dA = q_{int} / ε₀ (1)
As they indicate that the plate has an area A, we can use the concept of surface charge density
σ = Q / A
Q = σ A
The flow is to both sides of loaded plate
Φ = 2 E A
Let's replace in equation 1
2E A = σA / ε₀
E = σ / 2 ε₀ =
Q / 2A ε₀
This is in the field at point P.
b) Now we have two plates each with a load Q and 3Q respectively and they ask for the field between them
The electric field is a vector quantity
E = E₁ + E₂
In the gap between the plates the two fields point in the same direction whereby they add
σ₁ = Q / A
E₁ = σ₁ / 2 ε₀
For the plate 2
σ₂ = -3Q / A = -3 σ₁
E₂ = σ₂ / 2 ε₀
E₂ = -3 σ₁ / 2 ε₀
The total field is
E = σ₁ / 2 ε₀ + 3 σ₁ / 2 ε₀
E = σ₁ / 2 ε₀ (1+ 3)
E = 2 σ₁ / ε₀
E = 2Q/A ε₀
A person's weight will be greater on Jupiter than on earth
