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Mekhanik [1.2K]
3 years ago
6

Three resistors: R: = 3 , Rz = 62, and R. = 90

Physics
1 answer:
ki77a [65]3 years ago
3 0

Answer: Option C) 4A

Explanation:

Three resistors: R: = 3

Rz = 62

R. = 90

For total resistance for series connection

Rtotal = R + Rz + R.

Rtotal = 3 + 62 + 90 = 155 ohms

Voltage of battery = 36 Volts

Current = ? (Since ammeter measures current and the reading is not provided)

Now apply the formula:

Voltage = Current x Resistance

V = IR

36V = I x 155 ohms

I = 155 ohms/36V

I = 4.3 ampere ( rounded to nearest tenth as 4 ampere)

Thus, the ammeter read 4 ampere after the switch is closed

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The average speed of the car for the entire trip can be calculate by using:

v=\frac{S}{t}

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The total distance travelled by the car is:

S=80 km+50 km+40 km=170 km

while the total time taken is:

t=1.00 h+0.50 h+0.50 h=2.00 h


so, the average speed of the car is:

v=\frac{S}{t}=\frac{170 km}{2.00 h}=85 km/h


so, the correct answer is (3) 85 km/h.

7 0
3 years ago
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A force F~ = Fx ˆı + Fy ˆ acts on a particle that
Hatshy [7]

Answer:

W = 46 J

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First we will find the angle α of the force vector

tan\alpha =\frac{1}{8} \\\\\\alpha =7.125 deg\\

Then we find the angle β of the displacement vector

tan\beta=\frac{2}{6} \\\\beta = 18.43 deg\\

With these two angles we can find the angle between the two vectors

∅ = α + β = 25.56 deg

The definition of work is given by the expression

W=F*d*cos (theta)

The absolute value of F will be:

F=\sqrt{8^{2}+1^{2}  } \\F= 8.06 N

The absolute value of d will be:

d=\sqrt{(6 )^{2}+(2)^{2}  } \\d= 6.32m\\

Now we have:

W=8.06*6.32*cos(25.56)\\W=46 J

4 0
3 years ago
A box of unknown mass is sliding with an initial speed vi = 4.70 m/s across a horizontal frictionless warehouse floor when it en
malfutka [58]

Here Change in Kinetic Energy = Work Done by Friction

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0.5*( 5.90^2 - Vfinal^2 ) = 0.100*9.8*2.10

Therefore

vfinal = 5.54 m/sec

<span> </span>

8 0
3 years ago
Muscles that are fatigued ____. A. Are injured , B. Should always be rested , C. Can sometimes be exercised further D. Should be
Lorico [155]

Answer:

<u>B. Should be rested</u>

Explanation:

That is the only reasonable answer.

5 0
3 years ago
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A light bulb is rated at 25 w when operated at 110 v. how much charge enters (and leaves) the light bulb in 1.0 hour?
DedPeter [7]

According to the current, the charge is 818.18 coulombs.

We need to know about current to solve this problem. Current can be defined as the flow rate of charge through the medium. It can be determined as

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where I is current, Q is charge and t is time.

From the question above, we know that

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Calculate the current

P = V . I

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Hence, the charge is 818.18 coulombs.

Find more on current at: brainly.com/question/24858512

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4 0
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