Answer:
mechanical thermal chemical
Explanation: because you use mechanical energy to turn it on
The velocity of the combination of Jackie and the bicycle is 3.328 m/s.
Explanation:
From the given data the constant kinetic energy is 3.6 J. The mass of combination is 0.65 kg. To find the velocity of the combination of Jackie and the bicycle the formula is
KE = 0.5 x mv2.
To find velocity,
V2=ke/(0.5×m)
V=![\sqrt{(ke/(0.5*m)](https://tex.z-dn.net/?f=%5Csqrt%7B%28ke%2F%280.5%2Am%29)
v= 3.6/(0.5×0.65)
=![\sqrt (11077/10)/10](https://tex.z-dn.net/?f=%5Csqrt%20%2811077%2F10%29%2F10)
v= 3.328 m/s
Hence, the velocity of the combination of Jackie and the bicycle is 3.328m/s.
A or c I’m pretty sure it’s c though hope it helps:)
The light-collecting area of the 10-meter Keck telescope is <u>4 times greater </u>than the light-collecting area of the 5-meter Hale telescope.
Why?
We can calculate the light-collecting area of a telescope by using its diameter/radius. To do that, we can use the following formula:
![CollectingArea=\pi*(\frac{diameter}{2})^{2} = \pi radius^{2}](https://tex.z-dn.net/?f=CollectingArea%3D%5Cpi%2A%28%5Cfrac%7Bdiameter%7D%7B2%7D%29%5E%7B2%7D%20%3D%20%20%5Cpi%20radius%5E%7B2%7D)
Now, to know how much greater is the collecting area of the 10-meter keck telescope compared to the collecting area of the 5-meter hale telescope, we need to calculate their light-collecting areas and compare them.
For the 10-meter keck telescope, we have:
![Keck=\pi *(\frac{10m}{2})^{2}=\pi *(5m)^{2}=25\pi m^{2}](https://tex.z-dn.net/?f=Keck%3D%5Cpi%20%2A%28%5Cfrac%7B10m%7D%7B2%7D%29%5E%7B2%7D%3D%5Cpi%20%2A%285m%29%5E%7B2%7D%3D25%5Cpi%20m%5E%7B2%7D)
For the 5-meter hale telescope, we have:
![Keck=\pi *(\frac{5m}{2})^{2}=\pi *(2.5m)^{2}=6.25\pi m^{2}](https://tex.z-dn.net/?f=Keck%3D%5Cpi%20%2A%28%5Cfrac%7B5m%7D%7B2%7D%29%5E%7B2%7D%3D%5Cpi%20%2A%282.5m%29%5E%7B2%7D%3D6.25%5Cpi%20m%5E%7B2%7D)
Now, comparing the areas, we have:
![Ratio=\frac{KecksArea}{HalesArea}=\frac{25\pi m^{2} }{6.25\pi m^{2}}=4](https://tex.z-dn.net/?f=Ratio%3D%5Cfrac%7BKecksArea%7D%7BHalesArea%7D%3D%5Cfrac%7B25%5Cpi%20m%5E%7B2%7D%20%7D%7B6.25%5Cpi%20m%5E%7B2%7D%7D%3D4)
Hence, we have that the light-collecting area of the 10-meter keck telescope is 4 times greater than the light-collecting area of the 5-meter hale telescope.
Have a nice day!
Answer:
The girl will move with constant velocity
Explanation:
If after a certain time t_0 the velocity of the girl is v_0 =gt_0 and the upward force on the girl due to rope is mg ,where g is gravitational acceleration. Then the girl will move down with the constant velocity v_0 .
The girl will move with constant velocity,as explained above.