Answer:
V= 33.98 m/s
Explanation:
Given that
Horizontal speed ,u= 17 m/s
Time taken by rockets to strike the water ,t= 3 s
We know that acceleration due to gravity ,g= 9.81 m/s²
There is no any acceleration in the horizontal direction that is why the horizontal veloity will remain constant.
In the vertical direction
vy = uy+ g t
Initial velocity in vertical direction is 0 m/s.
vy= 0+ 9.81 x 3
vy = 29.43 m/s
The resultant velocity
V= 33.98 m/s
Answer:
substances will move faster and become warm to the touch.
Explanation:
when the radiation from the sun comes down and hits substances, the substances absorbs the radiation making them warm. the absorbed energy is transformed into heat energy. this heat energy plays an important role in regulating the temperature of the Earths crust, surface waters, and low atmosphere.
Answer:
A microchip in the phone modulates (or varies) a radio wave using the electrical signal. The radio wave travels through the air to a nearby cell tower; the tower sends your voice to the person you are calling and the process is reversed so that the person on the other end can hear your voice.
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Answer:
See the answers below.
Explanation:
A transformer is a static electrical machine, it should be borne in mind that although the voltage can be increased or decreased, the power must always be equal.
For this case:
The power in the first coil can be calculated by means of the following formula.
where:
V = voltage = 12 [V]
I = current =2 [A]
a)
Therefore the power:
![P=12*2\\P=24[W]](https://tex.z-dn.net/?f=P%3D12%2A2%5C%5CP%3D24%5BW%5D)
b)
Now in the second coil, the power must be the same:
![P_{secondcoil}=V*I\\24=144*I_{secondcoil}\\I_{secondcoil}=24/144\\I_{secondcoil}=0.166[A]](https://tex.z-dn.net/?f=P_%7Bsecondcoil%7D%3DV%2AI%5C%5C24%3D144%2AI_%7Bsecondcoil%7D%5C%5CI_%7Bsecondcoil%7D%3D24%2F144%5C%5CI_%7Bsecondcoil%7D%3D0.166%5BA%5D)
