Physics is good, physics is super good

Generate electricity, heat, sterilize, obtain high temperatures.

In a graduated container (volume L) filled with water, a wooden block of mass m is placed and the block floats.

Description buoyancy f=mg

Take out the block and check that the volume reads to l

Calculate water x(l-l)g

You will find that it is equal to mg.

Proof of buoyancy f= water x(l-l)g

Buoyancy = density of the excluded liquid x volume x g

Question 2. The first question.

f float = 36n - 26n = 10

Question 2. According to the formula f float = water v iron g

Get v iron = f float.

Dividing. Water multiplied by g

10n divided by the density of water multiplied?

Three. g iron = f float = 10n

m iron = g iron known divided by g constant, known about = 1kg from the second morning start Lu Zhao as can be known v iron.

According to the formula p iron = m iron v iron jin years = ?

The average speed is the total distance traveled by the total time.

The total time is 10+5+10=25 minutes = 1500 s, and the total distance is 6 x 600 s + 5 x 600 s = 6600m

So the average speed of the file is 6600 divided by 1500s = m s

Average speed = total distance Total sail imitation time travel car between lines = (6 * 600 + 5 * 600) [10 + 5 + 10) dismantling * 60] = 6600 1500 =

When the fixed end of the rope is connected to the fixed pulley, the number of segments of the rope n is the number of even matching.

When the fixed hail mill of the rope is terminated on the movable pulley, the number of segments n of the rope is an odd number.

The number of rope segments n is the number of segments of the rope in contact with the movable pulley).

It's pretty simple.

The efficiency is known to be to the 7th power of useful work

Then the actual work consumed is J to the 7th power J

The calorific value of diesel fuel is 7 to the power of J kg

Then consume vegetable oil for:

kilograms (the back 10 is the same on both sides of the 7th power, and I made an appointment).

This is the equivalent of simple harmonic vibrations.

Using the conservation of energy, the point b is taken as the position of zero potential energy scattered, and the gravitational potential energy of the ball moving from a to points b, a and b is converted into the kinetic energy of the ball.

1）w=mgh=1/2mv^2=

2) No, because this is the brigade digging fiber in the ideal situation, the effect of air resistance should be considered in practice, and the gravitational potential energy cannot be completely converted into the kinetic energy of the ball.

The first floor finished answering the questions.

Teach you how to get the picture up--in the lower right corner of the column of "Detailed Questions",There is a vertical state"Insert**"-click-browse-Yu Yuan found the **position in Dian Chunqi's brain-OK。