Today, we have a super physics problem in our monthly exam, eight times

1) Power supply voltage U=40

2) The total resistance of P at the midpoint is 36V, half of the resistance of RW is 90-40=50, and RW is 100.

3) The minimum voltage of RW is P at A, the access resistance is 0, the voltage is 0, the maximum voltage is P on the other side, the access resistance is maximum, the current is 36V (100 +40) =, and the partial voltage on RW is 100. So the voltage changes as:

When the slide p p of the sliding rheostat RW moves to the A terminus, i = u ro, and when the sliding vane p moves to the midpoint of the rheostat, i'=U (RO+RW 2) Substituting RO=40 into the above two equations can be solved to obtain U=36V, RW=100

3.When the slider P of the sliding rheostat RW is moved to the A terminal, the voltage on the RW is 0;

When the slider P of the sliding rheostat RW is moved to the far right, the voltage on the RW is .

u"=urw/(ro+rw)

36v×100ω/(40ω+100ω)

So the voltage variation range of RW is: 0

The voltage variation range of RW refers to the voltage drop that may occur at the maximum and minimum resistance values when it is connected in series with R0.

The minimum voltage is that when the slide p is at the A terminal, RW = 0, and the voltage drop is also equal to 0, and the maximum is: [36 (40+100)]*100 = that is, the voltage variation range on RW is 0

This is the most basic physics problem.

1.Supply voltage v=40*

Europe. rw=2*r1=100 euros.

3.When the slide p is at the A-terminus, v(r)=0

When the slider p is at the far right, i=v r=36 (40+100)=9 35=rw, voltage v1=i*rw=9 35*100=, or so the voltage is proportional to the resistance.

v(rw)=36*(100/140)=

The RW voltage varies from 0 to .

1) Voltage =

2) Resistance = 36, (90-40) * 2 = 100

3) When sliding to A, the voltage is 0, when sliding to the maximum, the resistance is 100, the current = 36 (40 + 100), the voltage of RW = 100 * current =

1.The power supply voltage is 36V

2.The maximum resistance is 100 ohms.

The principle of voltage division of series circuit is applied.

You can buy a copy of "Winning the Championship Lightly" to explain it simultaneously. Gold or Silver Edition. The eight strokes are the properties of matter, force and motion, pressure, and buoyancy.

Why don't you just go to the bookstore and buy a copy?

I'll take a moment of silence for you tomorrow and month, and I'm a little late.

After a resistor of R1 and R2=6 ohms is reasonably connected, the value of the total resistance r is ohms, and the resistance value of R1 and the way to connect it with R2 are questioned. (

a) R1 = 6 ohms: in series with (B) R1 = ohms, in series with R2.

c) R1 = 9 ohms, in parallel with R2 (D) R1 = ohms, in parallel with R2.

A 150 ohm resistor is required to repair electrical appliances, but there is only one resistor with a resistance value of 100 ohms, 200 ohms, and 600 ohms respectively

a) Connect a 200 ohm resistor in series with a 600 ohm resistor;

b) Connect a 100 ohm resistor in series with a 200 ohm resistor;

c) Parallel a 100 ohm resistor to a 200 ohm resistor;

d) Parallel a 200 ohm resistor to a 600 ohm resistor;

In a series circuit, r r1 r2, the total resistance of two conductors with different resistances in series is greater than that of any of them. The total resistance r is ohms < r2 = 6 ohms. A reasonable connection of the resistors should be in parallel.

So the formula 1 r 1 r1 + 1 r2 gives r1 = 9 ohms.

The answer is that c requires a resistor of 150 ohms, and there are resistors of 100 ohms, 200 ohms, and 600 ohms.

It is impossible to form a series connection from the perspective of three resistors, and the total resistance after parallel connection is less than that of any one parallel resistor. Therefore, the resistance of 100 ohms is rounded off. The formula for parallel circuits is 1 r 1 r1 + 1 r2

Therefore, the total resistance of 200 ohms and 600 ohms in parallel is 150 ohms.

The answer is d

The first thing to know is the formula fkx

kelastic coefficient

x amount of spring change )

Then column the first equation

K multiplication. Because there is no such symbol

So I barely used the text to see the =

And so it goes. k can be calculated without the = that can be reduced later

After all, I'm lazy)

Then list the second equation again:

Multiply. k into. x has three hooks, so it's multiplied by three

x is the amount of spring change after hanging).

So combined. k

Calculate it =. =

Finally. xcm) due to.

x is the amount of spring change.

So you have to add the original chief to get the answer. so

Length. cm) Finally, answer the question.

The length of the spring dynamometer at this time is. 16cm。That's it

1. All for the sake of convenience, I will directly set the big formula.

g = mg = (22000x2500 + 40000x1500) x 10 = 9 Newtons.

f= s=f p=1380000000 115000=12000 square meters.

p1 = density xgxh = 1000x10x100 = 1000000 pascal Reduce the pressure on the ground and save materials.

Ideas: The first question is mainly to find the quality of all materials, and the gravity can be found.

The second question is mainly to learn to use the pressure calculation formula, and to reverse the process.

The third question is mainly to learn to use the liquid pressure calculation formula.

The fourth question should be read in conjunction with the second question.

It's all done by hand!!

Please check the unit first to make sure that you have not copied the question incorrectly.

《1.>> cubic kg to the fourth power m2 + cubic x 4x10 to the fourth power = seven to the power.