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1.Because the load is in parallel, when the load is very heavy, the parallel load is too much, and the equivalent load resistance value is very small for the transformer sub-stage, when the resistance value is comparable with the original internal resistance of the coil, it will divide the voltage according to the voltage drop, resulting in the voltage on both sides of the load is lower than 220V....

4.Rain is a phenomenon caused by the liquefaction of water vapor when hot air is cold, so it cools down.

In winter, the cold air forms a film outside, so use heating to melt it.

5.The pressure is even greater.

6.The bullet energy decreases, and the sand energy increases (the kinetic energy of the bullet is converted into heat)7Because it relies on the recovery movement of the spring in the spring to support the work, when the spring returns to its original state, it will not work, so it must be kept in a deformed state all the time.

8.Because of the irreversible chemical process (redox reaction) that is generated, the cathode material is gone.

Question 5. It can be seen from p=f s.

When f is certain. The stressed area is reduced. The pressure increases.

The reason for question 5 is that when you lift one foot, the pressure on the soil increases, so it sinks deeper.

Car A travels east at an initial speed of 20m s, when it passes through the intersection, car B starts from 40m north of the intersection and starts from a standstill to drive south with an acceleration of 2m s 2, and after the car passes through the intersection for 6 seconds, B is relative to A's position.

2. After 6 seconds b relative to a velocity.

Answer: , the displacement of b is 1 2at 2 = 36m (located 4m north of the intersection road). The displacement of a is 20*6=120m (located 120m east of the intersection).

Their distance is: root number (36 2 + 120 2) = , car B is located northwest of car A, and the angle is north-west.

The velocity of B is at=12m s (from north to south) and the velocity of A is 20m s (west to east). Their relative velocity is (b relative to a, assuming a is at rest): root number (20 2 + 12 2) = and the direction is south-west.

is an inverse trigonometric function, which means the angle corresponding to tan = .

A travels eastward xa=20*6=120m

b travelled south xb= at =36m

B distance to junction xb'=40-36=4m [b is north of the intersection] a, b, and the intersection form a right triangle, and the distance of b from a is hypotenuse ab= (xa +xb'²)=

Direction: north-west (angle tan = xb.)'xa=1 30)b's velocity magnitude vb=at=12m s direction to the south of a's velocity magnitude va=20m s direction east.

The velocity of b with respect to a v = vector vb - vector va vector the hypotenuse of the triangle is the velocity of b with respect to a.

v=√(vb²+va²)=

Direction: south-west-south angle tan = vb va = 3 5).

Do you not know physics or foreign languages? Is this question difficult?

Solution: (a) (i) The projectile is thrown vertically in the vertical direction, and when the displacement of the projectile in the vertical direction reaches 70m, the initial velocity of the projectile hitting the surface in the vertical direction is:

v1=85sin15°≈

The formula for linear motion by uniform acceleration is:

70=solution: t1, t2 rounded)

So, it takes seconds for the shell to hit the water.

ii) The shell moves in a straight line at a constant speed in the horizontal direction, and the velocity is magnitude of:

v2=85cos15≈

With this horizontal velocity, the time from the launch of the shell to the time it reaches the surface of the water is the distance between y and z l=vt1=

iii) In the vertical direction, the speed at which the shell hits the surface of the water is:

v1'=v1+gt=

The velocity of the shell when it enters the water is v1'and v2 The combined velocity of two velocities:

v = ((b) The acceleration of the shell at point x and point z is both gravitational acceleration, ie.

1. After any u, c can be, for c, the table is plural, and the table is used at any time with the singular number 2, for example, the fruit table is called uncountable, and the table can be fruits, fishes are similar.

3. surprise, surprise is an abstract meaning, it should be an uncountable noun, and it can be said that a surprise is visualized to express a specific surprise event or transaction

The constant in the process of temperature drop should be at the freezing point.

Basically, the changes in the state of matter that occur when the temperature rises are endothermic, and the changes in the state of matter that require the temperature to decrease are exothermic.

Your physics isn't quite right, right? Where did you see it? Online?

The first thing that is affected by the temperature of a thermometer is the glass bubble, and then the mercury.

The sense of language and the nature of the verb or the verb!

Translation: Suppose 2 boxes are connected with a rope with a mass of 1 kg on a frictionless table, calculate the acceleration (size) of each box and the tension (size) at both ends of the rope

Acceleration a=fp (mA+mb+mc) =ftb=fbt=mb a=

fta=fat= fp-ma×a=

It is to the effect that "a woman is 60kg, the elevator is 815kg, when the elevator rises, the external force on the elevator and the woman is 9410n, and the woman's eye weight is sought at this time." "The acceleration of the system is a=9410 (60+815)=, and the apparent weight of the woman is (g+a)*m=1245n

5.No. The speed of the falling object increases under the action of the Chongqing circular force, and the resistance it receives also increases, but when the resistance content increases to the same as the gravity, the two forces of gravity and resistance become equilibrium force, and the acceleration of the object becomes zero, so the speed of the old collapse will no longer increase, and the object will maintain a uniform linear motion and fall.

Love is the V-shaped existence of the Volkswagen Changzhou New Town.

The problem is simply turned over, it is a nuclear fission equation, and then you are asked to find the energy released by this reaction, and write it in joules and mev respectively.

First of all, look at the equation, it's just an ordinary fission equation, and the content of the investigation here is the mass-energy theorem, which is e=mc 2

c is the speed of light. Here, he gave the mass of one atom of each element before and after the reaction.

Then e=((m141, 56 ba +m92, 36 kr+m1,0 n)-(m235,92 u+m1,0 n))c 2

x 10 -25kg + x 10 -25kg - x 10, -25kg)c^2

This is the energy emitted by the reaction of a u atom, the unit is joules, and you can convert it to the unit of mev.

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