Answer:
There's one or two reasons, depending on what is meant by "wind-powered car".
The first reason is that it's impossible for any transfer of energy to be 100% efficient. There will always be frictional losses.
Secondly, if the company means that they want to attach a wind turbine to the car so that the car is powered by the same wind that it generates, that violates the conservation of energy.
Answer:
v_squid = - 2,286 m / s
Explanation:
This exercise can be solved using conservation of the moment, the system is made up of the squid plus the water inside, therefore the force to expel the water is an internal force and the moment is conserved.
Initial moment. Before expelling the water
p₀ = 0
the squid is at rest
Final moment. After expelling the water
= M V_squid + m v_water
p₀ = p_{f}
0 = M V_squid + m v_water
c_squid = -m v_water / M
The mass of the squid without water is
M = 9 -2 = 7 kg
let's calculate
v_squid = 2 8/7
v_squid = - 2,286 m / s
The negative sign indicates that the squid is moving in the opposite direction of the water
Answer:
I would say the stone is being used as a fulcrum.
Explanation:
An example of a fulcrum is the triangle thing under a seesaw. I don't know for sure if that's the right answer, but I would strongly suggest it. Hope I helped, have a nice day :)
Answer:
The speed of electron is
and the speed of proton is 2468.02 m/s.
Explanation:
Given that,
Electric field, E = 560 N/C
To find,
The speed of each particle (electrons and proton) 46.0 ns after being released.
Solution,
For electron,
The electric force is given by :


Let v is the speed of electron. It can be calculated using first equation of motion as :

u = 0 (at rest)



For proton,
The electric force is given by :


Let v is the speed of electron. It can be calculated using first equation of motion as :

u = 0 (at rest)



So, the speed of electron is
and the speed of proton is 2468.02 m/s. Therefore, this is the required solution.