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Romashka-Z-Leto [24]
3 years ago
15

My teacher didnt explain this well and im lost

Physics
1 answer:
Vedmedyk [2.9K]3 years ago
4 0

Explanation:

(a) The given figure is a convex lens.

(b) In this figure, the object is placed between F and optical center of a lens. Convex lens is a converging lens. It converges the beam of light falling on it after reflection. The image is formed on the same side of the lens as the object.

The formed image is enlarged and it is virtual and erect.

(i) Type : virtual

(ii) Orientation : upright

(iii) Size : Enlarged

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What happens to molecules when their kinetic energy decreases?
Illusion [34]

Answer:

The speed of molecule decreases and temperature also decreases

Explanation:

Kinetic energy of the molecules of a subsance is directly proportional to the temperature of molecule So as the kinetic energy decrease, temperature also decreases. decreses their speed.

6 0
3 years ago
How do I solve this​
Svetradugi [14.3K]

Answer:

W = 8.01 × 10^(-17) [J]

Explanation:

To solve this problem we need to know the electron is a subatomic particle with a negative elementary electrical charge (-1,602 × 10-19 C), The expression to calculate the work is given by:

W = q*V

where:

q = charge = 1,602 × 10^(-19) [C]

V = voltage = 500 [V]

W = work [J]

W = 1,602 × 10^(-19) * 500

W = 8.01 × 10^(-17) [J]

8 0
4 years ago
A person makes ice tea by adding ice to 1.8 kg of hot tea, initially at 80°C. How many kilograms of ice, initially at 0.00°C, ar
Nata [24]

Answer:

The required mass of ice is 12.5 kg.

Explanation:

Mass of hot tea, m_{t} = 1.8 kg

Initial temperature of hot tea = 80°C = 353 K

Initial temperature of ice = 0.00°C = 273 K

Final temperature of mixture = 10°C = 283 K

Heat of fusion of ice, L = 334 kJ/kg

Specific heat capacity of tea, c_{t} = Specific heat capacity of water = 4190 J/kg/K

Heat lost tea = Heat gained by ice

m_{t}c_{t}ΔT_{t} = m_{i}L +  m_{i}c_{i}ΔT_{t}

m_{t}c_{t}ΔT_{t} = m_{i} (L +  c_{i}ΔT_{t})

1.8 x 4190 x (353 - 283) = m_{i}(334 + (4190 x (283 - 2730))

1.8 x 4190 x 70 = m_{i}(334 + (4190 x 10))

527940 = 42234m_{i}

m_{i} = \frac{527940}{42234}

    = 12.5004

m_{i} = 12.5 kg

The required mass of ice is 12.5 kg.

4 0
3 years ago
One end of a horizontal spring with force constant 130.0 Ni'm is attached to a vertical wall. A 4.00-kg block sitting on the flo
tekilochka [14]

Answer:

Explanation:

When the spring is compressed by .80 m , restoring force by spring on block

= 130 x .80

= 104 N , acting away from wall

External force = 82 N , acting towards wall

Force of friction acting towards wall = μmg

= .4 x 4 x 9.8

= 15.68 N

Net force away from wall

= 104 -15.68 - 82

= 6.32 N

Acceleration

= 6.32 / 4

= 1.58 m / s²

It will be away from wall

Energy released by compressed spring = 1/2 k x²

= .5 x 130 x .8²

= 41.6 J

Energy lost in friction

= μmg x  .8

= .4 x 4 x 9.8 x .8

= 12.544 J

Energy available to block

= 41.6 - 12.544 J

= 29 J

Kinetic energy of block = 29

1/2 x 4 x v² = 29

v = 3.8 m / s

This will b speed of block as soon as spring relaxes. (x = 0 )

4 0
3 years ago
During a phase change,the temperature remains constant although heat is still being added. what is the best explanation for what
Dovator [93]

During the phase change in which heat is being added but the temperature remains constant, the heat energy is used to break the bonds in the molecules.

<h3>What is a phase change?</h3>

A phase change is the conversion of one state of matter to another. e.g. solid to liquid or liquid to gas.

Substances can exists in three states namely;

  • solid
  • gaseous
  • liquid

In a change of phase, heat energy is needed to break the existing bonds between the molecules of the initial state. For example, heat energy is needed to break the bonds of ice to form water.

However, during this phase change, the temperature remains constant.

Therefore, during the phase change in which heat is being added but the temperature remains constant, the heat energy is used to break the bonds in the molecules.

Learn more about phase change at: brainly.com/question/1429452

3 0
3 years ago
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