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
sweet-ann [11.9K]
2 years ago
7

6. For a cell to produce a current, the

Physics
2 answers:
UNO [17]2 years ago
8 0
Answer: (A)

Current flows in a circuit having a cell only when the electrodes of the cell have finite potential difference.
Reil [10]2 years ago
6 0

Answer:

for a cell to produce a current the cell electrodes of the cell must have a potential difference option A is the correct answer

You might be interested in
One way to provide artificial gravity (i.e., a feeling of weight) on long space voyages is to separate a spacecraft into two par
stira [4]

Answer:

1)  T = 649.86 s, 2)   L₀ = L_f,   \frac{K_o}{K_f} = 4.8

Explanation:

1) As the system of the two bodies is isolated, its angular momentum is conserved

             

initial instant.  r₀ = 155 m, T₀= 385.3 s

      L₀ = I₀ w₀

final instant. r = 119.35 m

      L_f = I w

      L₀ = L_f

      I₀ w₀ = I w

      w = \frac{I_o}{I}  \ w_o

let's consider each object as punctual

      I = m r²

at angle velocity and period are related

         w = 2pi / T

     

we substitute

      \frac{2\pi }{T} = \frac{m r^2}{m _o^2 } \ \frac{2\pi }{T_o}

      \frac{1}{T} = ( \frac{r}{r_o} )^2 \ \frac{1}{T_o}

       T = (\frac{r_o}{r} )^2 \ T_o

let's calculate

       T = ( \frac{155}{119.35} )^2 \ 385.3

        T = 649.86 s    

2) The angular momentum is conserved because the system is isolated.

Let's look for kinetic energy

        K_total = 2 K = 2 (½ I w²)

        K_total = I 4π² / T²

        K_total = 2m r² 4 π² / T²

 

for r = 155 m

         K₀ = 8π² m r₀² / T₀²

for r = 119.35 m

          K_f = 8π² m r² / T²

the relationship is

        \frac{K_o}{K_f} = ( \frac{r_o \ T}{ r \  \ T_o} )^2

        \frac{K_o}{K}  = ( \frac{ 155 \ \ \ 649.86}{ 119.35 \ 385.3})^2

       \frac{K_o}{K_f} = 4.8

6 0
3 years ago
If you hold your arm outstretched with palm upward, the force to keep your arm from falling comes from your deltoid muscle. assu
Maurinko [17]
Your question seems to be incorrect. Please check below:

What force must the deltoid muscle provide to keep the arm in this position? By what factor does this force exceed the weight of the arm?<span>If you hold your arm outstretched with palm upward, as in (Figure 1) , the force to keep your arm from falling comes from your deltoid muscle. Assume that the arm has mass 4 kg and the distances and angles shown in (Figure 1) . 

F=? 
F/w= ?

The answer is </span><span>339 N</span><span>

</span>
4 0
3 years ago
An optical disk drive in your computer can spin a disk up to 10,000 rpm (about 1045 rad / s). if a particular disk is spun at 79
NeX [460]
(i) |α| = 235.6rad.s / 0.502s = 469 rad/s²
(ii) tang a = α*r = 469rad/s² * 0.12m / 2*11 = 2.56 m/s²
4 0
3 years ago
PHYSICS PLEASE HELP
WINSTONCH [101]

Explanation:

Newton’s First Law of Motion - if an object is at rest, it takes un-

balanced forces to make it move. Conversely, if an object is moving

it takes an unbalanced force to make it change it’s direction or speed.

Newton was the first to see that such apparently diverse phenomena as a satellite moving near the Earth's surface and the planets orbiting the Sun operate by the same principle: Force equals mass multiplied by acceleration, or F=ma.

Mark me as brainlist

7 0
3 years ago
Read 2 more answers
#86 can an object be moving when its acceleration is zero? can an object be accelerating when its speed is zero?
liraira [26]
Yes, an object<span> that was set in motion in the past by some force, but that is no longer being acted on by a net force, is </span>moving<span> but with </span>zero acceleration<span>, i.e. it is </span>moving<span> at constant velocity.</span>
7 0
3 years ago
Other questions:
  • (x) A change in position is called:
    13·1 answer
  • In the United States, car accidents are the leading cause of death for teenagers. Wearing seat belts helps save lives. Describe
    10·1 answer
  • Which planets can never be seen at midnight? A. The Superior planets. B. The Inferior planets C. All planets can be seen at midn
    10·1 answer
  • A 75-g bullet is fired from a rifle having a barrel 0.580 m long. Choose the origin to be at the location where the bullet begin
    12·1 answer
  • Find the change in the force of gravity between two planets when the distance between them becomes 10 times smaller. g
    7·1 answer
  • Small pockets of synovial fluid that reduce friction and act as a shock absorber where ligaments and tendons rub against other t
    12·1 answer
  • PLEASE HELP ASAP I WILL GIVE BRAINIEST
    12·2 answers
  • If a special type of ice has a specific heat capacity of 2060 J/kg K. How
    15·1 answer
  • An archer shot a 0.07 kg arrow at a target. The arrow accelerated at 4,000 m/s2 to reach a speed of 50.0 m/s as it left the bow.
    9·2 answers
  • A hunter who is standing 220.0-m away fires his rifle. How long (in seconds) will it take the sound to travel to your ear.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!