1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Charra [1.4K]
3 years ago
7

A machine require 2,000 joules to raise a 20 kilogram block a distance of 6 meters. How efficient is the machine?

Biology
1 answer:
Nataly_w [17]3 years ago
8 0
Potential energy = (mass) x (gravity) x (height) .

To raise the 20kg block 6 meters, you need to give it

                         (20 kg) x (9.8 m/s²) x (6 m) = 1,176 joules

of potential energy.

Your machine takes 2,000 joules of energy to give the block
the 1,176 joules that it takes.

Your machine is only  (1176 / 2000) = 58.8% efficient .

The other 'missing' 824 joules of energy doesn't just disappear.
It heats the machine, and the air around it.  The final result is
that when you use that machine to lift blocks, you have to use
even MORE energy, to blow cool air on the machine and prevent
it from overheating and breaking.
You might be interested in
What is required to initiate the coupling of myosin to actin?
VladimirAG [237]

Answer:

<h2>Calcium ions</h2>

Explanation:

The actin and myosin are the myofilaments which are involved in the contraction and relaxation of the muscle. The actin is thin filaments and contains the attachment site for the myosin but the site is blocked by the tropomyosin and troponin proteins.  

When calcium ions present in the muscle binds to the troponin molecules, it changes the conformation of the tropomyosin. This change exposes the attachment site of the myosin and then the myosin binds the troponin and causes Powerstroke and leads to contraction of a muscle.

Thus, Calcium ions is correct.

6 0
3 years ago
List environmental invaders
antoniya [11.8K]
Worms, decomposers, predators.
8 0
3 years ago
Irreversible nerve damage may be caused by excessive intake of _______ supplements.
kow [346]

The answer is the vitamin B 6 supplement can cause irreversible nerve damage. Taking too many vitamins can cause also a toxic effect on our body.  Too much vitamin B6 can also cause oversensitivity to sunlight, which can lead to skin rashes and numbness, as well as nausea, vomiting, abdominal pain, loss of appetite, and abnormal liver function.

4 0
2 years ago
Will give brainliest plz help <br> Answer 12 plz
Ivan

Answer:

Abiotic factors, such as temperature, water, sunlight amounts, and regional terrain, directly effect biotic factors. Biotic factors are the living components of an ecosystem which include primary producers, consumers, and dexomposers.

Abiotic factors can effect organisms in many ways. Hey can effect primary producers negatively if there is too little sun, water, or nutrients in the soil. However, if there is too much of any one of these, they can still be negatively effected. With primary producers, it’s all about balance.

while consumers do not directly require the above conditions, they do rely on the plants and animals that feed on said plants to survive. If the plants do not have correct nutrients, they will not either. As far as terrain goes, they adapt to better cope with the environment. If they live in an aquatic enviromment for example, they acquire ways to more efficiently move through the water to look for food.

Decomposers rely on the remains of dead plants and animals in order to survive. They feed off of dead matter and the waste gets deposited into the soil. This in turn helps to give the soil its nutrients, and so the cycle continues.

Everything in nature is reliant on each other. This delicate balancing act is both beautiful and so very fragile. If one organism is removed, the entire ecosystem could suffer. This is why it is so critical to protect the environment we share with every other living creature on this earth.

6 0
3 years ago
Nicotine, a substance found in cigarettes, causes blood vessels to constrict. What effect might prolonged smoking have on the bo
KonstantinChe [14]
C. High Blood Pressure is the answer
6 0
3 years ago
Read 2 more answers
Other questions:
  • If a single bacteriophage infects one
    12·1 answer
  • At what molarity is the sucrose solution isotonic to the cells? (solve for x, when y = 0)
    5·1 answer
  • Never handle____ with your____use a brush and a dustpan to clean-up____.
    11·1 answer
  • What form of reproduction is shown
    10·1 answer
  • Based on the data, we determined that plant growth is affected by the type of soil What is the student doing ?
    8·1 answer
  • The Sun appears _______ in the sky and for a _______ period of time each day during summer than it does during winter.
    10·2 answers
  • Explain how photosynthesis would be affected if there were a shortage of NADP+ in the cells of plants
    13·1 answer
  • 13. Which of the following would not result in
    15·1 answer
  • 31. Which category of carbon-based molecules includes sugars and starches?
    12·1 answer
  • Which water based animals have a mechanism to prevent water from diffusing into their bodies
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!