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
pshichka [43]
2 years ago
7

Help m-e-e people -_-!​

Physics
1 answer:
xxTIMURxx [149]2 years ago
6 0

Answer:

the answer is

Explanation:For equilibrium

Weight = Tension

mg=T

∴T=4×3.1π=12.4πN (as can be inferred from the question)

Y=

△l/l

T/A

​

=

1000

0.031

​

/20

12.4π/π(

1000

2

​

)

2

​

=

4×0.031

12.4×20×1000×(1000)

2

​

=2×10

12

N/m

2

You might be interested in
Which is better, ramen, or spaghetti
Sergio039 [100]

Answer:

ramen

Explanation:

7 0
3 years ago
Read 2 more answers
Which of the following is NOT true regarding the far side of the moon:
frutty [35]
It contains no large maria
8 0
3 years ago
Where is the magnet that causes Earth’s magnetic field? What is this magnet made of?
Y_Kistochka [10]

Answer:

The magnetic field of Earth is created by currents of electricity that flow in the molten center.

Explanation:

6 0
3 years ago
n ultraviolet light beam having a wavelength of 130 nm is incident on a molybdenum surface with a work function of 4.2 eV. How f
pashok25 [27]

Answer:

The speed of the electron is 1.371 x 10⁶ m/s.

Explanation:

Given;

wavelength of the ultraviolet light beam, λ = 130 nm = 130 x 10⁻⁹ m

the work function of the molybdenum surface, W₀ = 4.2 eV = 6.728 x 10⁻¹⁹ J

The energy of the incident light is given by;

E = hf

where;

h is Planck's constant = 6.626 x 10⁻³⁴ J/s

f = c / λ

E = \frac{hc}{\lambda} \\\\E = \frac{6.626*10^{-34} *3*10^{8}}{130*10^{-9}} \\\\E = 15.291*10^{-19} \ J

Photo electric effect equation is given by;

E = W₀ + K.E

Where;

K.E is the kinetic energy of the emitted electron

K.E = E - W₀

K.E = 15.291 x 10⁻¹⁹ J - 6.728 x 10⁻¹⁹ J

K.E = 8.563 x 10⁻¹⁹ J

Kinetic energy of the emitted electron is given by;

K.E = ¹/₂mv²

where;

m is mass of the electron = 9.11 x 10⁻³¹ kg

v is the speed of the electron

v = \sqrt{\frac{2K.E}{m} } \\\\v =  \sqrt{\frac{2*8.563*10^{-19}}{9.11*10^{-31}}}\\\\v = 1.371 *10^{6} \ m/s

Therefore, the speed of the electron is 1.371 x 10⁶ m/s.

8 0
3 years ago
In which situation is the speed of the car constant while its velocity is changing?
Sati [7]

Answer:

B, the car travels around a circular track at 30 m.

Explanation:

7 0
2 years ago
Other questions:
  • It is common to see birds of prey rising upward on thermals. The paths they take may be spiral-like. You can model the spiral mo
    11·1 answer
  • Which type of mirror is placed behind the bulb in car headlights?
    15·1 answer
  • A thin slice of silicon that contains many solid-state components is a(an)
    5·2 answers
  • You push a box with a force of 80 n. if the net force on the box is 50 n, what is the force on the box due to sliding friction?
    9·1 answer
  • An ideal monatomic gas at temperature T is held in a container. If the gas is compressed isothermally, that is at constant tempe
    8·1 answer
  • Which is a result of law of matter in a chemical reaction<br>​
    5·1 answer
  • Would water, steam, granite, or lead make the best thermal insulator? A thermal insulator is a substance that requires a lot of
    6·1 answer
  • La taille d'un molécule d'eau est 0,4nm
    11·1 answer
  • A. 24.89<br> B. 25.89<br> C. 17.74<br> D. 19.73
    6·1 answer
  • How did you manage to overcome the difficulties that arose?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!