PHYSICS MIDDLE SCHOOL

**PLEASE QUICKLY **A circuit has a resistance of 250 and is powered by a 120 V batteryThe current in the circuit, to the nearest tenth, is
____А.

Answers

Answer 1
Answer:

Answer:

Current, I = 0.48 A

Explanation:

We have,

Resistance of a circuit is 250 ohms

Voltage of the battery is 120 V

It is required to find the current flowing in the circuit. Let I is the electric current. Ohm's law is given by :

V=IR\n\nI=(V)/(R)\n\nI=(120)/(250)\n\nI=0.48\ A

So, the current in the circuit is 0.48 A.

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Answers

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Answers

We have to wonder what substance you're working with.  Under normal, human environmental conditions, there are almost no substances that freeze and boil at the same temperature. 

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Answers

6.

Answer:

45 meters

Explanation:

notice that is you multiply the time with the speed the units cancel to get distance.

therefore

distance=velocity(time)

distance=(3)15

distance =45 meters

7.

Answer:

1. the speed is constant

2. the average speed is .5 m/s

Explanation:

I have attached a graph of the data in excel.

from excel i got the equation of the line to be y=.5x with y being distance and x being time.

the function is a position function so if you take the derivative of it you get the velocity which is .5.

since the derivative is a constant the the speed does not change and the average velocity is the derivative.

10 POINTS!!! Determine the pressure of your book in pascals (Pa). Show your work! (the pressure of the book in psi is 0.03 psi) Also the weight of the book is 3 lbsHInt: 1 Pa = 1 N/m^2 Weight (force) = ma 1 kg = 2.2 lbs 1 inch = 2.54 cm 1m = 100 cm

Answers


You've listed a lot of data here, in both metric and customary units,
and I'm not even sure it's all needed.  Let me try and boil it down:

Pressure on a surface =
               (total force on a surface) divided by (area of the surface).

The answer to the question is the pressure expressed in pascals. 
There's actually enough information here to answer the question
in 2 different ways.  We could ...

-- simply convert (0.03 pound per inch²) to pascals, or
-- go through the whole calculation of force, area, and then their quotient. 

To me, converting 0.03 psi to Pa looks easier.

-- 1 pascal = 1 newton / 1 meter²

-- On Earth, 1 kilogram of mass weighs 9.8 Newtons and 2.2 pounds.
From this, we can calculate that

                    2.2 pounds of force = 9.8 newtons of force.

                     1 pound = 4.45 newtons

(0.03 pound/inch²) x (4.45 newton/pound) x (1inch/2.54cm)² x (100cm/1m)² =

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