A small elastic ball with a mass of 0.3KG vertically hits the wall at a speed of 6m / s on a smooth horizontal plane. After the collision, the ball moves in the opposite direction, and the speed after rebound is the same as that before the collision. Then the work done by the wall on the ball during the collision is () A. W=0B. W=5.4JC. W=10.8JD. W=21.6J

A small elastic ball with a mass of 0.3KG vertically hits the wall at a speed of 6m / s on a smooth horizontal plane. After the collision, the ball moves in the opposite direction, and the speed after rebound is the same as that before the collision. Then the work done by the wall on the ball during the collision is () A. W=0B. W=5.4JC. W=10.8JD. W=21.6J

According to the kinetic energy theorem, w = 12mv2-12mv02 = 0, so the work done by the wall on the ball is 0, so a

Work formula of inclined plane
FL=Gh
How is this pushed out? Can you give me more details? Thank you
I'm only in the second grade of junior high school. It's better to answer with the knowledge we've learned at this stage. Thank you. Don't talk about the increase of gravitational potential energy. We haven't learned it. We can't understand it at all.

When an object moves towards a slope at a constant speed under oblique upward force, the kinetic energy remains unchanged and the gravitational potential energy becomes larger. Why does the gravitational potential energy become larger? Because the object is subjected to the work done by the oblique upward force on it, the work done by the force on the object can be regarded as the increase of the gravitational potential energy of the object
So: FL = GH

Work formula of inclined plane
The work done by the inclined plane tension (friction) w = FS, and the work done by the inclined plane tension (excluding friction) w = FH = GH. Are these two formulas correct?

If you don't remember friction, that is, there's nothing wrong with GH, but if you don't talk about FH, you can only say that if you ignore F, f = G
W = FS is also true, but if you write F, you can subtract them and divide them by S

Who knows the formula of work done by inclined plane?
Who is going to tell us the derivation formula of the work done by the pulling force of the inclined plane?

F=ufN. [email protected]=cos@mg.

Formula of work done by pushing an object on an inclined plane
In this process, the work done by Xiao Li is equal to the product of the thrust on the oil barrel and the length of the inclined plane

It should be changed to the work done by Xiao Li to the oil barrel. Because the F in the formula depends on whether his own gravity is included, that is to say, it must be stipulated whether the work done by Xiao Li to himself is included

Electric bicycle is a popular means of transportation, it can be electric riding, can also pedal riding, electric riding, battery power supply to the motor on the car, the motor provides power for the car, the following table is the main technical reference of a certain type of electric bicycle. Vehicle mass 40kg, maximum speed 30km · h, maximum noise 62db, voltage 48V, capacity 12a · h, rated voltage 48V, rated power 240W : if 80% of the energy stored in the battery is used to overcome the resistance of the electric bicycle, the average resistance of the electric bicycle is 40n when driving at a constant speed on a straight road. How far can the battery run continuously when it is fully charged?

The driving process of E-bike is the process of using the electric energy in the battery to overcome the resistance in the driving process. The electric energy is used to overcome the resistance to do mechanical work. Its efficiency is 80%. Then, how much is the total amount of electric energy released after a charge? J? W = uit = 48V × 12a · H = 2073600j
2073600J×80%=1658880J
W=Fs
s=W/F=1658880J÷40N=41472m

Work formula
What is w = GH? What is g? What is h?

That's my answer. Do you understand?

Formula of work done by resultant force on object

What's the formula: w = f × s

Find all the formulas of physical electric power, including the formula of pure resistance circuit. I fell asleep in class. It's better to bring some good questions

(1) series circuit P (electric power) U (voltage) I (current) w (electric work) r (resistance) t (time) current is equal everywhere I1 = I2 = I total voltage equals to the sum of voltage at both ends of each electrical appliance u = U1 + U2 total resistance equals to the sum of resistance R = R1 + R2 U1: U2 = R1: R2 total electric work equals to the sum of electric work w = W1 + W2

The common research method in physics is "model method"

The basis of establishing model in physics is to grasp the main contradiction and ignore the influence of secondary factors on the basis of prototype