Answer: a) 7.71 m/s², b) - 6.67 m/s²
Explanation: first thing to note is that
1 mile = 1609.34
1 hour = 3600s
Hence, 100mph to m/s = (100 × 1609.34)/3600 = 44.71 m/s
Initial velocity (u) = 0, final velocity (v) = 44.71 m/s, t = 5.8s, a = acceleration =?
By using newton's laws of motion
v = u + at
44.71 = 0 + a(5.8)
44.71 = 5.8a
a = 44.71/5.8
a = 7.71 m/s²
Question b)
The car is completing a stop which implies that the car is coming to rest, and when a car is coming to rest, the final velocity (v) is zero.
Hence u = 34 m/s, v = 0, a =?, t = 5.1 s
v = u + at
0 = 34 + a(5.1)
a(5.1) = - 34
a = - 34/5.1
a = - 6.67 m/s².
The negative sign beside the acceleration shows that the body is decelerating
Answer:
A) Series
Explanation:
The elements of an electric circuit can be connected in two different configurations:
- Series: two resistors are connected in series when they are connected along the same branch, so that the current flowing through them is the same. In this case, the equivalent resistance of the circuit is given by
So, it is given by the sum of the individual resistances of the elements. In this case, the voltage drop acrosss each element is different.
This configuration is more simple to arrange, however it has a drawback: if one of the element is disconnected from the circuit (or it's broken), the whole circuit stops working.
- Parallel: two resistors are connected in parallel when thet are connected in different branches having the same potential difference across them. However, the current through them is different. In this case, the equivalent resistance is given by
This configuration is more difficult to arrange, however if one of the element is disconnected from the circuit (or it's broken), the whole circuit keeps working.
In this figure, we see that the two light bulbs are connected along the same branch: therefore, they are connected in series.
Answer:
0,00123 = 1,2*10^{-3}
Explanation:
To write down correctly the number 0,00123 in scientific notation, you take into account that the scientific notation demands that there in only one number after the comma ( , ). Furthermore, it is necessary that you move the comma to the right of the first number different of zero, in this case the number 1. To do this you move the comma three positions.
Then, you have to multiply the expresion 1.23 by 10 with an exponential -3 (because of the movement of the comma in three positions). That is:
0,00123 = 1,23*10^{-3}
But it is mandatory that nly one number can stay after the comma, so, you approximate the number three. In this case, the number is lower than 5, hence, you approximate 3 to 0.
Finally, you have:
0,00123 = 1,2*10^{-3}
Answer:
Explanation:
According to Gauss's Law, the electric flux of a charged sphere is the electric field multiplied by the area of the spherical surface:
This is identical to the electric flux of a point charge located in the center of the sphere.
Answer: Diffraction
Explanation:
-Diffraction, is basically the bending of waves as they move around an obstacle or through an opening. In both, the cases diffraction occurs. So as the waves hit the obstacle they will bend slightly around it.
The other options, for a better understanding why it's option A:
-Interference occurs when two waves at one point or another in the same medium, overlap
-Refraction of waves is the change in its direction when it moves from one medium to another. The other factors that change with refraction are the wavelength.