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
exis [7]
3 years ago
8

A 0.73-m aluminum bar is held with its length parallel to the east-west direction and dropped from a bridge. Just before the bar

hits the river below, its speed is 20 m/s, and the emf induced across its length is 7.9 x 10-4 V. Assuming the horizontal component of the Earth's magnetic field at the location of the bar points directly north, (a) determine the magnitude of the horizontal component of the Earth's magnetic field, and (b) state whether the east end or the west end of the bar is positive.
Physics
1 answer:
Tasya [4]3 years ago
4 0

Answer:

A)  B = 5.4 10⁻⁵ T, B) the positive side of the bar is to the West

Explanation:

A) For this exercise we must use the expression of Faraday's law for a moving body

            fem = -  \frac{d \phi }{dt}

            fem = - \frac{d (B l y}{dt}= - B l v- d (B l y) / dt = - B lv

            B = - \frac{fem}{l \ v}

we calculate

             B = - 7.9 10⁻⁴ /(0.73 20)

             B = 5.4 10⁻⁵ T

B) to determine which side of the bar is positive, we must use the right hand rule

the thumb points in the direction of the rod movement to the south, the magnetic field points in the horizontal direction and the rod is in the east-west direction.

Therefore the force points in the direction perpendicular to the velocity and the magnetic field is in the east direction; therefore the positive side of the bar is to the West

You might be interested in
Why do<br> stars seem to move at night?<br> ght
Tema [17]
It looks that way cause the earth is rotation on its axis
4 0
3 years ago
Read 2 more answers
PLEASE HELP ASAP!!!!!!!!!!WILL GIVE BRAINLIEST...
Delicious77 [7]
The answer to this is D. Green.
7 0
3 years ago
Read 2 more answers
When the termination is a terminal block, care must be taken to ensure a good electrical connection without damaging the conduct
Tamiku [17]

Answer:

When the termination is a terminal block, care must be taken to ensure a good electrical connection without damaging the conductor. Terminals should not be used for more than one

Explanation:

The Terminal block being a modular block, having insulated frame, which can secure more than two wires in it. It has a conducting strip in it. These terminal clocks helps in making the connection safer as well as organised. These terminal blocks are used for power distribution in safer way. Its potential is it can distribute power from single to multiple output. The conductor is used for making it proper contact.

8 0
3 years ago
Why is the sky blue?
Levart [38]

Answer:

Gases and particles in Earth's atmosphere scatter sunlight in all directions. Blue light is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.

7 0
2 years ago
When atoms are organized in repeating patterns, they generally make a _________. select one of the options below as your answer:
valkas [14]
A. Solid

Solid structures are actually made of repeating patterns.

4 0
3 years ago
Other questions:
  • Nancy is pushing her empty grocery cart at a rate of 1.8 m/s. 30 seconds later,
    12·1 answer
  • Mary just received a traffic ticket but decided it is not worth being upset about. Mary just made a__________.
    15·1 answer
  • As part of a carnival game, a 5.00 kg target is freely hanging from a very long and very light wire. Contestants can use one of
    14·1 answer
  • Metals experience plastic deformation when _____.
    9·1 answer
  • If $1,800 is invested in a savings account offering interest at a rate of 4.5% per year, compounded continuously, how fast is th
    14·1 answer
  • Kara Less was applying her makeup when she drove into South's busy parking lot last Friday morning. Unaware that Lisa Ford was s
    9·2 answers
  • A table lamp draws a current of 200 mA when it is connected to a 120-V source. What is the resistance of the table lamp?
    8·1 answer
  • A world class sprinter is travelling with speed 12.0 m/s at the end of a 100 meter race. Suppose he decelerates at the rate of 2
    14·1 answer
  • What is the wavelength of an FM radio
    6·1 answer
  • On a spaceship designed to support a multiyear voyage to the outer planets of the solar system, plants will be grown to provide
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!