Explanation:
Given that,
The slope of the ramp, ![\theta=8^{\circ}](https://tex.z-dn.net/?f=%5Ctheta%3D8%5E%7B%5Ccirc%7D)
Mass of the box, m = 60 kg
(a) Distance covered by the truck up the slope, d = 300 m
Initially the truck moves with a constant velocity. We know that the net work done on the box is equal to 0 as per work energy theorem as :
![W=\dfrac{1}{2}m(v^2-u^2)=0](https://tex.z-dn.net/?f=W%3D%5Cdfrac%7B1%7D%7B2%7Dm%28v%5E2-u%5E2%29%3D0)
u and v are the initial and the final velocity of the truck
(b) The work done on the box by the force of gravity is given by :
![W=Fd\ cos\theta](https://tex.z-dn.net/?f=W%3DFd%5C%20cos%5Ctheta)
Here, ![\theta=90+8=98^{\circ}](https://tex.z-dn.net/?f=%5Ctheta%3D90%2B8%3D98%5E%7B%5Ccirc%7D)
![W=mgd\ cos\theta](https://tex.z-dn.net/?f=W%3Dmgd%5C%20cos%5Ctheta)
![W=60\times 9.8\times 300\ cos(98)](https://tex.z-dn.net/?f=W%3D60%5Ctimes%209.8%5Ctimes%20300%5C%20cos%2898%29)
W = -24550.13 J
(c) What is the work done on the box by the normal force is equal to 0 as the angle between the force and the displacement is 90 degrees.
(d) The work done by friction is given by :
![W_f=-W](https://tex.z-dn.net/?f=W_f%3D-W)
![W_f=24550.13\ J](https://tex.z-dn.net/?f=W_f%3D24550.13%5C%20J)
Hence, this is the required solution.
Answer:
I think it's
Pumice, cedar, and cork
If I am wrong you have my full permission to correct me :)
- LxlyPxppy <3
Answer:
The circuit is in series connection,
the same current will flow through i.e
I1 = I2 = I3 = 2A.
Explanation:
We'll begin by calculating the total resistance in the circuit. This is shown below:
R1 = 4Ω
R2 = 3Ω
RT =..?
Total resistance in series can be obtained as follow:
RT = R1 + R2
RT = 4 + 3
RT = 7Ω
Next we shall determine the total current flowing in the circuit:
Voltage (V) = 14V
Resistance (R) = 7Ω
Current (I) =..?
V = IR
14 = I x 7
Divide both side by 7
I = 14/7
I = 2A.
Since the circuit is in series connection,
the same current will flow through i.e
I1 = I2 = I3 = 2A.
Kilowatt is a unit of power ... a RATE of using energy. Kilowatt-hour is an amount of energy ... the amount used in 1hour at the average rate of 1 kilowatt. (Or in 1,000 hours at the average rate of 1 watt.)
Answer:
c
10 A
Explanation:
Use the equation that calculates voltage: V = IR (That's capital "i")
"V" represents voltage. It's measured in the unit volts, the symbol V.
"I" represents current. It's measured in amperes, the symbol A.
"R" represents resistance. It's measured in ohms, the symbol Ω.
From the question, we know the source is 120 V and the resistance is 12Ω.
Substitute V = 120V, R = 12Ω into the equations. Isolate "I" to find the current.
V = (I)(R)
120V = (I)(12Ω)
I = 120V ÷ 12Ω
I = 10A
Therefore:
The current of a 12-ohm hair dryer that is connected to a 120-volt power source is <u>10 A (10-amps)</u>.