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
Romashka-Z-Leto [24]
3 years ago
7

Ten high-technology batteries are tested for 200 hours each. One failed at 20 hours; another failed at 140 hours; all others com

pleted the test. FR(%) is __________ and MTBF is __________.
Physics
1 answer:
Bas_tet [7]3 years ago
4 0

Answer:

Failure rate   = 20%

MTBF = 880 hours

Explanation:

given data

batteries = 10

tested = 200 hours

one failed = 20 hours

another fail at =  140 hours

solution

we know that Mean Time between Failures is express as = (Total up time) ÷  (number of breakdowns)    ....................1

so here Total up time will be

Total up time = 200 × 10

Total up time = 2000

and here

Number of breakdown = 1 at 20 hour and another at 140 hour = 2

so it will be  = (Total up time) ÷ (number of breakdowns)      .......2

=  \frac{2000}{2}   =  1000  

so here gap between occurrences is

gap between occurrences=  140 - 20

gap between occurrences = 120 hour

and

MTBF  will be

MTBF = 1000 - 120

MTBF = 880 hours  

and

Failure rate (FR)  will be

Failure rate (FR) =  1 ÷ MTBF    ................3

Failure rate (FR) = R÷T     ......................4

as here R is the number of failures and T is total time

so Failure rate (FR)  = 20%

You might be interested in
2. A 5 year old child pushes with a force of 5 N to get a sumo wrestler to move, but the
Svetllana [295]

formula= W=f*d

w=work done

f=force

d=distance

w=f*d

w= 5n*0(does not budge)means does not move so distance is zero

w=5J

The work done by the children on the sumo wrestler is 5J

6 0
3 years ago
Niels Bohr's important discovery was?
Tom [10]
In 1912, Bohr<span> was working for the Nobel laureate J.J. Thompson in England when he was introduced to Ernest Rutherford, whose </span>discovery<span> of the nucleus and development of an atomic model had earned him a Nobel Prize in chemistry in 1908. Under Rutherford's tutelage, </span>Bohr<span> began studying the properties of atoms.

</span>
7 0
2 years ago
Read 2 more answers
Newton's third law of motion says that for every action there is a(n)<br> and opposite reaction.
aksik [14]

Answer:

that's correct.

Explanation:

4 0
3 years ago
Your car has a mass of 1,250 kg. If a force of 8,750 N is applied, how fast will it accelerate?​
Drupady [299]

Answer:

7 m/s^{2}

Explanation:

f = ma

a = \frac{f}{m}

a = \frac{8750}{1250}

a = 7 m/s^{2}

8 0
2 years ago
A negative charge is moving across a rook from south to north. A magnetic field runs from East to west. In what direction is the
Zinaida [17]

Answer:

The magnetic force on the moving negative charge is towards the ceiling.

Explanation:

The magnetic force acting on a wire is given by the relation as follows :

F=q(v\times B)

q is charged particle

v is velocity of charged particle

B is magnetic field

In this case, a negative charge is moving across a rook from south to north. A magnetic field runs from East to west.

q = -q

v =+j

B = -i

So,

F=-q(vj\times B(-i))

Since, j\times i=-k

So,

F=q(v\times B)(-k)

So, the magnetic force on the moving negative charge is towards the ceiling.

5 0
3 years ago
Other questions:
  • A reaction that absorbs 49.6 kj from the surroundings in a vessel that undergoes a volume decrease of 1.25 l at a constant 4.00
    8·2 answers
  • Water that flows from behind a large dam can cause machines to produce electricity. What change takes place?
    13·1 answer
  • A flying saucer lifts the Physical Science building 10,000 ft into the air before discovering it is useless and discards the rem
    13·1 answer
  • An airplane has a takeoff speed of 62 m/s. assuming a constant acceleration of 1.7 m/s2, what is the minimum length of runway it
    6·1 answer
  • If one light bulb burns out in a string of lights, and the rest stay lit, it is reasonable to assume that the lights are wired i
    9·1 answer
  • A liquid does not have a definite shape, but it does have a definite volume.<br><br> TRUE or FALSE
    13·2 answers
  • Use free fall in a sentance
    9·2 answers
  • 1. What are three questions you should ask before joining a club?
    13·1 answer
  • A badger is running at a speed of 1 m/s. If the badger moves that was for 2600 seconds, how far will the badger travel?
    12·1 answer
  • Are we really real or are we all an allusion?Do you believe in past lives?How do you think you died in past life?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!