Science questions in the first year of junior high school, urgent, answer within 15 minutes

In the following examples, each of them deals with which kind of energy.

1.A leaf that falls from a tree is heavy on potential energy, kinetic energy 2A burning candle heat, chemical, light3A rubber band tied to a bundle of newspaper elastic potential energy.

4.The leaping frog kinetic energy, heavy potential energy.

5.Melting ice thermal energy.

Indicate which of the following sports they belong to.

1.The wind blows the leaves to the ground and the mechanical movement.

2.In October, the osmanthus blooms in the Life Movement.

3.People danced and sang and moved mechanically.

1 kinetic energy, 2 thermal energy, 3, elastic potential energy, 4 kinetic energy, 5 thermal energy.

1 mechanical movement 2 life movement 3 mechanical movement.

1 gravitational potential energy, kinetic energy.

2. Chemical energy, internal energy.

3. Elastic potential energy.

4. Elastic potential energy, kinetic energy, gravitational potential energy.

5 internal energy. I don't understand much below.

Bounty Points: 10 - 14 days and 23 hours until the end of the questionWhich of the following examples is involved.

1.A leaf that falls from a tree – gravitational potential energy.

2.A burning candle -- chemical energy, heat energy.

3.A rubber band tied to a bundle of newspaper elastic potential energy.

4.Jumping frog kinetic energy

5.Melting ice thermal energy.

Indicate which of the following sports they belong to.

1.The wind blows the leaves to the ground

2.In October, osmanthus blooms

3.People danced and sang to their heart's content

In the following examples, each of them deals with which kind of energy.

1.A leaf that falls from a tree – gravitational potential energy.

2.A burning candle heat, light.

3.A rubber band tied to a bundle of newspaper elastic potential energy.

4.Jumping frog kinetic energy, chemical energy.

5.Melting ice thermal energy, (chemical energy).

Indicate which of the following sports they belong to.

1.The wind blows the leaves and falls to the ground, the movement of life, the movement of machinery.

2.In October, osmanthus blooms with the movement of life and the movement of machinery.

3.People danced and sang to their heart's content, mechanical movements, sound movements.

With my understanding, I should be right

Parenthesis of indeterminacy. ）

1, kinetic energy 2, thermal energy 3, elastic potential energy 4, potential energy to kinetic energy 5, thermal energy.

1 mechanical movement 2 life movement 3 mechanical movement.

What about the title?What's the use of being in a hurry?

Silk is a tissue that transports water and nutrients, called ducts and tracheids.

These tissues are as accessible in plants as they are in animals.

The inner wall of the duct of the plant will be particularly thickened in a certain part and form various textures, some are ring-shaped, some are trapezoidal, and some are reticulated. However, the thickened part of the duct wall of lotus root is continuously spiral-shaped, which is specially called spiral-shaped catheter. When the lotus root is broken, the thickened spiral part of the inner wall of the catheter detaches and becomes a spiral-shaped filament, with a diameter of only 3 5 microns.

These filaments are much like elongated springs and do not break within the limits of elasticity, and can generally be elongated to about 10 centimeters.

Resources.

What's the problem? What's the hurry?

Cattle. Only when the friction force is greater than the friction force can the wooden block accelerate and start moving. Because the cow is the largest, the wooden block must do an accelerated movement under the force of the ox. Therefore there is a sliding friction that is greater than the block and is greater than the maximum static friction.

(1) There are (5) food chains in this food web, which belong to the producers (grass) and to the primary consumers (herbivorous birds and insects).

2) Assuming that the energy fixed by the grass is constant, the owl gets the food chain with the most energy (herbivore bird owl).

26. Due to the discharge of a large amount of sewage into a lake, the water quality has deteriorated, resulting in the death of fish and other aquatic organisms, and the destruction of aquatic biodiversity. Please analyze and answer.

1) During the experiment, it is necessary to observe the main content of the record (the number of frog eggs successfully hatched in each ecological bottle).

2) The reason why they chose the number of fertilized eggs as 100 instead of 5 was (to avoid the chance of the experiment) [do not write to make the results of the experiment more accurate, it should be that the average value is not written in this question, but it can be added later to make the experimental results more general].

3) The role of group A ecological bottle is (control) [the role can be written directly to the control].

Proficient in mathematics, physics and chemistry to answer for you.

o(oThank you.)

25 (1) 5 food chains, from low-level predators to high-level predators, one by one, number (2) grass-insect-spider-toad-toad-snake-owl The longest is often the one that obtains the most energy26 (1) The number of frog eggs hatched (hatching), the basic knowledge of the controlled trial (2) Too few will produce a greater chance of chance (5 will have chance), ibid., examine the basic knowledge.

3) Form a comparison (make a comparison), the same as above, and examine the basic knowledge.

(1) The producer is grass, and the primary consumers are herbivore birds and insects (2) It is not very clear.

1) The number of frog eggs hatched in each eco-bottle.

2) Prevent chance and make the experimental results more accurate.

3) Set up a control group.

I'm 100% sure that's all I have, so please set it as a satisfactory answer for my sincerity.

5 Grass belongs to the producer Belongs to the primary consumer (except for the owl) (2) Assuming that the energy fixed by the grass is constant, the owl receives the most energy from the food chain (the lowest one).

Environmental water quality on the number of frog fertilized eggs hatched.

2) Improve the reliability of the experiment (the meaning is close to the control).

(1) 5 Herbivorous birds and insects, the word is not clear (2) Herbivorous insects owls.

26.(1) The number and time of hatching frog eggs.

2) Take 100 capsules to be more representative and exclude accidental interference (3) as a control.

Classmate: I can't see it.