Answer : 413.44N
Here it is given that an elevator is moving down with an acceleration of 3.36 m/s² . And we are interested in finding out the apparent weight of a 64.2 kg man . For the diagram refer to the attachment .
- From the elevator's frame ( non inertial frame of reference) , we would have to think of a pseudo force.
- The direction of this force is opposite to the direction of acceleration the frame and its magnitude is equal to the product of mass of the concerned body with the acceleration of the frame .
- When a elevator accelerates down , the weight recorded is less than the actual weight .
From the Free body diagram ,
- Mass of the man = 64.2 kg
I think it’s c) a transverse wave is made of particles that move perpendicular to the motion of the wave
Answer: Option C) 11.25 A
Explanation:
Given that:
Voltage V = 90 volts
total current I = ?
Three resistors each with 40 Ω, 30 Ω, and 15 Ω in parallel, the equivalent resistance of the combination (Rtotal) of the circuit is as follows:
i.e 1/Rtotal = (1/R1 + 1/R2 + 1/R3)
1/Rtotal = (1/40Ω + 1/30Ω + 1/15Ω)
1/Rtotal = (3 + 4 + 8)/120Ω
1/Rtotal = 15/120Ω
1/Rtotal = 1/8Ω
To get the value of Rtotal, cross multiply
Rtotal x 1 = 8Ω x 1
Rtotal = 8Ω
Then, apply the formula V = I x Rtotal
90 volts = I x 8Ω
I = 90 volts / 8Ω
I = 11.25 Amperes
Thus, the total current used by the three lamps is 11.25 Amperes
Answer:
Height reached will be 28.35 m
Explanation:
Here we can use the work energy theorem to find the maximum height
As we know by work energy theorem
Work done by gravity + work done by friction = change in kinetic energy
![-mgh - F_f h = 0 - \frac{1}{2}mv_i^2](https://tex.z-dn.net/?f=-mgh%20-%20F_f%20h%20%3D%200%20-%20%5Cfrac%7B1%7D%7B2%7Dmv_i%5E2)
now we will have
![-1.60(9.8)(h) - 0.900(h) = - 470](https://tex.z-dn.net/?f=-1.60%289.8%29%28h%29%20-%200.900%28h%29%20%3D%20-%20470)
![-16.58 h = -470](https://tex.z-dn.net/?f=-16.58%20h%20%3D%20-470)
![h = 28.35 m](https://tex.z-dn.net/?f=h%20%3D%2028.35%20m)
so here the height raised by the stone will be 28.35 m from the ground after projection in upward direction
Well there's only one path for the current to travel through in a series circuit.
there are multiple paths in a parallel circuit.