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
12345 [234]
3 years ago
15

The value of efficiency is never 100% or more in practice. why​

Physics
1 answer:
Alona [7]3 years ago
3 0

Answer: Because of presence of friction in most cases as friction exists in ever machine/body, so whenever it works, friction causes heat and sound energy as well, hence, proving that a system cannot be 100% efficient due to friction.

You might be interested in
Which factors could be potential sources of error in the experiment? check all that apply.
Vadim26 [7]

(A)energy lost in the lever due to friction

(C) visual estimation of height of the beanbag

(E)position of the fulcrum for the lever affecting transfer of energy

6 0
3 years ago
Read 2 more answers
A rock is dropped off a cliff and falls the first half of the distance to the ground in 2.0 seconds. how long will it take to fa
son4ous [18]

Answer:

The answer is 0.83 seconds.

Explanation:

The formula of free fall is following:

h=1/2*g*t^2

Where g=9.8 m/s^2 and t=2 seconds, the rock takes:

h=1/2*9.8*2^2=19.6

19.6 meters. This is the half distance of the cliff. The whole distance is 39.2 meters. So it takes:

39.2=1/2*9.8*t^2\\t^2=8\\t=2.83

2.83 second to fall down completely. The rock takes the second half of the cliff in 0.83 seconds

8 0
3 years ago
What is an example of radiation? check all that apply
Katen [24]
There are no appropriate examples in the list you provided with your question.

Examples of radiation:

... sunshine to tan your skin
... radio energy to bring you the news
... X-ray to check your teeth
... microwave to heat up the meatloaf
... flashlight to see where you're going
... RF energy to get an MRI of your knee
... infrared radiation from the campfire to warm your tootsies
... UHF radio waves to make a call or check Facebook with your smartphone
4 0
3 years ago
An engineer is investigating potential energy with two
miv72 [106K]

Answer:

  • Since they move in the same direction, share the same magnetic qualities, and move one unit identically
  • We can safely say its D
4 0
3 years ago
Read 2 more answers
Tasting and smelling both involve the ability to sense chemicals. true or false
lara31 [8.8K]
TRUE.
Taste and smell senses are separate senses with their own receptor organs yet they are intimately entwined. Tastants, chemicals in foods are detected by taste buds which consist of special sensory cells.. When stimulated, these cells send signals to specific areas of the brain which then makes us conscious of the perception of taste. Also specialized cells in the nose pick up odorants, airborne odor molecules. Odorants stimulate receptor proteins found on hairlike cilia at the tips of the sensory cells, a process that initiates a neural response.
6 0
3 years ago
Read 2 more answers
Other questions:
  • A 4 kg bird is flying with a velocity of 4 m/s. What is its kinetic energy?
    12·1 answer
  • A piece of metal is 4 cm by 10 cm<br>by 2 cm. Find its mass if it has a<br>density of 2 g/cm'.​
    8·1 answer
  • A thin, 75.0 cm wire has a mass of 16.5 g. One end is tied to a nail, and the other is attached to a screw that can be adjusted
    7·1 answer
  • If you start with a substance as a solid, what will happen to the molecules as you add thermal energy (heat)?
    5·1 answer
  • Jake drove 160 kilometres in 2 hours. What was his speed, in kmh-1
    8·2 answers
  • A motorcycle, which has an initial linear speed of 9.8 m/s, decelerates to a speed of 2.2 m/s in 3.4 s. Each wheel has a radius
    10·1 answer
  • Fruit and write your thought about it​
    6·1 answer
  • A ray of light travelling obliquely from a rarer medium to a denser medium goes _______​
    8·1 answer
  • Correctness the relation Where pressure=3accleration due to gravity/4pi G​
    8·1 answer
  • Advantages of using tidal power include _____. no air pollution tides are predictable low environmental impact all of these
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!