Answer;
Average speed = 47.5 km/hr
Explanation and solution;
Average Speed = Total distance /Total time
Total distance;
-In the first two hours travelling at 40km/hr, total distance traveled is 80km.
(40 × 2) = 80 km
-In next two hours distance covered is 110 km. (55 ×2)
Total distance = 110 + 80 = 190 km
Total time = 2 + 2 = 4 hours
Average Speed = Total distance /Total time
= 190/4
= 47.5 km/hr
A. The commander in chief role deals only with the the military, while the chief executive role is broader
Answer:
F
Explanation:
When comparing two vector quantities you have to compare both magnitude and direction,but for scalar you only compare magnitude
Answer:
The radius of its orbit is 
.
Explanation:
Let suppose that Callisto rotates around Jupiter in a circular path and at constant speed, then we understand that net acceleration of this satellite is equal to the centripetal acceleration due to gravity of Jupiter. That is:
(1)
Where:
- Angular speed, measured in radians per second.
- Radius of the orbit, measured in meters.
- Net acceleration, measured in meters per square second.
In addition, angular speed can be described in terms of period (
), measured in seconds:
(2)
And the net acceleration by the Newton's Law of Gravitation:
(3)
Where:
- Gravitation constant, measured in cubic meters per kilogram-square second.
- Mass of Jupiter, measured in kilograms.
Now we apply (2) and (3) in (1) to derive an expression for the radius of the orbit:
![R = \sqrt[3]{\frac{G\cdot m\cdot T}{4\pi^{2}} }](https://tex.z-dn.net/?f=R%20%3D%20%5Csqrt%5B3%5D%7B%5Cfrac%7BG%5Ccdot%20m%5Ccdot%20T%7D%7B4%5Cpi%5E%7B2%7D%7D%20%7D)
(4)
If we know that 
, 
and 
, then the radius of the orbit of Callisto is:
![R = \sqrt[3]{\frac{(6.674\times 10^{-11}\,\frac{m^{3}}{kg\cdot s^{2}} )\cdot (1.90\times 10^{27}\,kg)\cdot (1460160\,s)^{2}}{4\pi^{2}} }](https://tex.z-dn.net/?f=R%20%3D%20%5Csqrt%5B3%5D%7B%5Cfrac%7B%286.674%5Ctimes%2010%5E%7B-11%7D%5C%2C%5Cfrac%7Bm%5E%7B3%7D%7D%7Bkg%5Ccdot%20s%5E%7B2%7D%7D%20%29%5Ccdot%20%281.90%5Ctimes%2010%5E%7B27%7D%5C%2Ckg%29%5Ccdot%20%281460160%5C%2Cs%29%5E%7B2%7D%7D%7B4%5Cpi%5E%7B2%7D%7D%20%7D)
