According to the cameraman:
Initial velocity: 30 km/hr = 8.33 m/s
Final velocity: -(45 - 20) = -25 km/hr = -6.94 m/s²
a = (-6.94 - 8.33)/2
a = -7.64 m/s²
The direction is opposite to the motion of the car, that is, East.
According to the crew member on ground:
Initial velocity: 20 + 30 = 50 km/hr = 13.89 m/s
Final velocity: -45 km/hr = -12.5 m/s
a = (-12.5 - 13.89) / 2
a = -13.2 m/s²
The direction is the same, East.
Answer:
h = R/4 = 1.5925 x 10⁶ m = 1592.5 km
Explanation:
The variation in the value of acceleration due to gravity value with respect to the altitude is given by the following general formula:
![g' = g(1-2\frac{h}{R})](https://tex.z-dn.net/?f=g%27%20%3D%20g%281-2%5Cfrac%7Bh%7D%7BR%7D%29)
where,
h = altitude from surface of earth = ?
g = acceleration due to gravity on surface of earth = 9.81 m/s²
R = Radius of Earth = 6.37 x 10⁶ m
g' = acceleration due to gravity at given altitude = g/2
Therefore,
![\frac{g}{2} = g(1-2\frac{h}{R})\\\\2\frac{h}{R} = 1-\frac{1}{2}\\\\2\frac{h}{R} = \frac{1}{2}\\\\\frac{h}{R} = \frac{1}{4}\\\\](https://tex.z-dn.net/?f=%5Cfrac%7Bg%7D%7B2%7D%20%20%3D%20g%281-2%5Cfrac%7Bh%7D%7BR%7D%29%5C%5C%5C%5C2%5Cfrac%7Bh%7D%7BR%7D%20%3D%201-%5Cfrac%7B1%7D%7B2%7D%5C%5C%5C%5C2%5Cfrac%7Bh%7D%7BR%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7D%5C%5C%5C%5C%5Cfrac%7Bh%7D%7BR%7D%20%3D%20%5Cfrac%7B1%7D%7B4%7D%5C%5C%5C%5C)
<u>h = R/4 = 1.5925 x 10⁶ m = 1592.5 km</u>
Answer:
Average speed = 8.8 m/s
Average velocity = 8.8 m/s
Explanation:
From the question,
Avearge speed = 2πr/t................ Equation 1
Where r = 14 m, t = 10 s
Constant π = 22/7
Substitute this value into equation 1
Average speed = 2(22/7)(14)/10
Avearge speed = 8.8 m/s.
For a body moving in circular motion, The average speed and average velocity are equal.
Hence,
Average speed = 8.8 m/s
Average velocity = 8.8 m/s
Hello.
The answer is:
It creates a spark.
Then thespark can sometimes start a fire or other serious problems.
Have a nice day