Answer:
power is given by work done divide time taken
P=w/t
therefore Pt=w
270x42=11,340.J
Answer:
R=4Ω
Explanation:
R1 and R3 are parrallel
so we have : R=R1*R2/R1+R2
R=6*3/6+3
R=18/9
R=2Ω
R2 and 2Ω are in series,so we have
R=R2+2
R=2+2
R=4Ω
Answer:
1404 N .
Explanation:
Force = rate of change of momentum
d/dt ( mv₁ - mv₂ )
If v₂ = - v₁
rate of change of momentum
= d/dt ( mv₁+mv₁ )
=2x v₁ dm / dt ( Here velocity of water v₁ throughout is constant )
Force = 2 xv₁ dm / dt
Given ,
v₁ = 18 m/s
dm / dt = rate of flow of mass of water
= 39 kg / s
Putting the values in the equation above
Force = 2xv₁ dm / dt
= 2x18 x 39
= 1404 N .
Answer:
at the end of its first second of fall
Explanation:
Can I have brainliest
Answer: 592.37m
Explanation:
Person D is the blue line.
The total displacement is equal to the difference between the final position and the initial position, if the initial position is (0,0) we have that he first goes down two blocks, then right 6 blocks. then up 4 blocks, then left 1 block.
Now i will considerate that the positive x-axis is to the right and the positive y-axis is upwards.
Then the new position will be, if B is a block:
P =(6*B - 1*B, -2*B + 4*B) = (5*B, 2*B)
And we know that B = 110m
P = (550m, 220m)
Now, then the displacement will be equal to the magnitude of our vector, (because the difference between P and the initial position is equal to P, as the initial position is (0,0)) this is:
P = √(550^2 + 220^2) = 592.37m
