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3 years ago

What energy transformation occurs during the combustion of coal in a power plant?

Physics

2 answers:

Leviafan [203]3 years ago

5 0

C. chemical to thermal

inn [45]3 years ago

4 0

Hello there, the correct answer is:

B.

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A laptop can convert 400J of electrical energy into a 240J of light and sound. What is the efficiency? Where does the rest of th

Blababa [14]

Efficiency = (Wanted) energy out ÷ energy in × 100

Energy in = 400J
Wanted Energy out = 240J

Energy cannot be used up, only transferred, so the remaining energy is most likely to be transferred into unwanted energy (loss of energy) such as heat energy.

Efficiency = 240 ÷ 400 × 100
Efficiency = 0.6 × 100
Efficiency = 60%

8 0

3 years ago

What minerals attracts iron nails?

Helga [31]

A lodestone is a naturally magnetized piece of the mineral magnetite. They are naturally occurring magnets, which can attract iron. The property of magnetism was first discovered in antiquity through lodestones.

3 0

3 years ago

Two identical light springs with spring constant k3 are now individually hung vertically from the ceiling and attached at each e

Alenkasestr [34]

Answer:

Keq = 2k₃

Explanation:

We can solve this exercise using Newton's second one

F = m a

Where F is the eleatic force of the spring F = - k x

Since we have two springs, they are parallel or they are stretched the same distance by the object and the response force Fe is the same for the spring age due to having the same displacement

F + F = m a

k₃ x + k₃ x = m a

a = 2k₃ x / m

To find the effective force constant, suppose we change this spring to what creates the cuddly displacement

Keq = 2k₃

7 0

3 years ago

A 2.7-kg cart is rolling along a frictionless, horizontal track towards a 1.1-kg cart that is held initially at rest. The carts

olga2289 [7]

Answer:

Part a)

P = 8.23 kg m/s

Part b)

v = 3.05 m/s

Explanation:

Part a)

momentum of cart 1 is given as

$P_1 = m_1v_1$

$P_1 = (2.7)(3.7) = 9.99 kg m/s$

Momentum of cart 2 is given as

$P_2 = m_2v_2$

$P_2 = (1.1)(-1.6) = -1.76 kg m/s$

Now total momentum of both carts is given as

$P = P_1 + P_2$

$P = 8.23 kg m/s$

Part b)

Since two carts are moving towards each other due to mutual attraction force and there is no external force on two carts so here momentum is always conserved

so here we will have

$P_i = P_f$

$(2.7 kg)v = 8.23$

$v = 3.05 m/s$

3 0

3 years ago

Muscles can continue to work at high level if they are getting the ___ that need to

finlep [7]

Muscles can continue to work at a high level if they are getting the supplements that need to function properly and they are listed below.

Explanation:

1.Creatine

Creatine is a molecule that is naturally formed in your body. It energizes the muscles and other tissues.
It can also increase the water content in the growth of muscles.

2.Protein

Protein is the building block of the muscles. Having enough protein helps maintain muscle mass and stimulates muscle development.
Many studies show that consuming plenty of protein will help improve muscle strength

3.Branched-Chain Amino Acids

It is composed primarily of three types of amino acids. They're used mainly in sources of protein.
This is important for the muscle growth.

7 0

3 years ago