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
Will butterfly populations continue to rise throughout the world?
laila [671]
Yes they will google the reason
4 0
3 years ago
How many electrons are in this atom?<br> А. 13<br> в. 20<br> с. 7<br> D. 6
natulia [17]
Answer is 36 electrons
4 0
3 years ago
Read 2 more answers
When testing for hiv, a/an test produces more accurate results than the elisa test?
34kurt

When testing for hiv, an Antibody screening test produces more accurate results than the elisa test.

<u>Explanation:</u>

An Antibody screening test is the best test available to diagnose a HIV infected person by spotting a particular protein in the infected blood sample. HIV a sexual borne disease is highly contagious and a life taker. The earlier it is been deducted through the antibody screening test and the treatment can be given to expand your life cycle.

ELISA test is a normal test that is done collecting the blood sample of the patients and when known an ELISA test is done on an individual it defers and shakes the person scary to death as it takes a minute for the test but a long wait to announce the result .

4 0
3 years ago
It is said that the protoplasm cannat be analysed chemically.Why?
vlada-n [284]
It couldn't be analysed chemically because it's chemical composition is to complex. It would be hard for us to analyse them because once it has been removed from the organism, it ends as protoplasm only.
8 0
3 years ago
(last question) #5<br> Describe the different body senses and how they function.
Bad White [126]

Answer:

Those senses are sight, smell, hearing, taste, and touch. We see with our eyes, we smell with our noses, we listen with our ears, we taste with our tongue, and we touch with our skin. Our brain receives signals from each of these organs, and interprets them to give us a sense of what's happening around us.

Explanation:

This is the best that I could do

7 0
3 years ago
Read 2 more answers
Other questions:
  • Apakah peranan salur darah dalam meningkatkan kehilangan haba?​
    8·2 answers
  • Spanish scientist observes that salmon produce more eggs when grown in a warmer aquariums he asked his colleagues in the United
    12·1 answer
  • A certain species of pine tree survives only in scattered locations at elevations above 2800 meters in the western United States
    12·1 answer
  • What type of relationship is present between the clown fish and the anemone
    13·1 answer
  • What did one mint ice cream say to the other? <br> We're mint to be.
    13·2 answers
  • From food.<br> Respiration is the process in which organisms use oxygen to release from ____ food
    15·1 answer
  • This person's job is to ensure tat the trial is fair.
    14·2 answers
  • Below is data for 250 offspring mice, as produced in a laboratory.
    5·2 answers
  • List 2 abiotic factors in the rainforest
    5·2 answers
  • How did the Avery experiment expand on Frederick Griffith's observations?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!