Answer:
![v = 3369.2 m/s](https://tex.z-dn.net/?f=v%20%3D%203369.2%20m%2Fs)
Explanation:
As we know that Beacon is rotating with angular speed
![f = 10 rev/min](https://tex.z-dn.net/?f=f%20%3D%2010%20rev%2Fmin)
so we have
![\omega = 2\pi f](https://tex.z-dn.net/?f=%5Comega%20%3D%202%5Cpi%20f)
![\omega = 2\pi(\frac{10}{60})](https://tex.z-dn.net/?f=%5Comega%20%3D%202%5Cpi%28%5Cfrac%7B10%7D%7B60%7D%29)
![\omega = 1.047 rad/s](https://tex.z-dn.net/?f=%5Comega%20%3D%201.047%20rad%2Fs)
now we know that
![v = r \omega](https://tex.z-dn.net/?f=v%20%3D%20r%20%5Comega)
here we will have
![r = 2 miles = 2(1609 m)](https://tex.z-dn.net/?f=r%20%3D%202%20miles%20%3D%202%281609%20m%29)
![r = 3218 m](https://tex.z-dn.net/?f=r%20%3D%203218%20m)
so we have
![v = 3218(1.047)](https://tex.z-dn.net/?f=v%20%3D%203218%281.047%29)
![v = 3369.2 m/s](https://tex.z-dn.net/?f=v%20%3D%203369.2%20m%2Fs)
Answer:
<u>18000 J</u> is the work can do by the motor.
Explanation:
If an electric motor works for 12 seconds and the power output is 1.5 KW = 1500 Watts we need to find how much work can an electric motor does.
We know that,
“Power” is defined as the “rate” of doing “work”, the “energy” transferred or converted per unit time. Mathematically, ![\text { power }=\frac{\text {work}}{\text { time }}](https://tex.z-dn.net/?f=%5Ctext%20%7B%20power%20%7D%3D%5Cfrac%7B%5Ctext%20%7Bwork%7D%7D%7B%5Ctext%20%7B%20time%20%7D%7D)
Where, units of power is “Watt”, units of work is “Joule” and time in “seconds”.
Substitute the given values to find work
![1500=\frac{w o r k}{12}](https://tex.z-dn.net/?f=1500%3D%5Cfrac%7Bw%20o%20r%20k%7D%7B12%7D)
1500 × 12 = work
Work = 18000 Joules
Therefore, work can done by an electric motor is <u>18000 J</u>.
Answer:
The biggest advantage of Solar cookers is their eco-friendliness. By exploitation one you’ll decrease your dependence on gas or electricity, cut back your carbon footprint, and save on fuel and therefore the value of fuel on running home appliances. change of state with star cookers clearly needs daylight, that makes it troublesome to use throughout winter months and on rainy days. change of state conjointly takes a considerably longer time compared to traditional strategies. Users should schedule their change of state time and maximize the employment of daylight. As a result, preparation should begin early within the morning in order that the food may be placed in the cooking utensil by noontide.
Explanation:
Hope this helps
Answer:
$v_f = = 7.9 \times10^3 \text{ m/s }$
Answer:
Explanation:
a) The magnitude of the net force on the student = 0 N since the student is standing still on level ground and upward reaction force = downward force.
b) the magnitude of the contact force on the student by the backpack = 80 N since the student was backing the backpack
c) the magnitude of the contact force o the student by the ground = 550 N + 80 N = 630 N reactional force on the student