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
Naily [24]
3 years ago
7

Which one of the following indicates a drop in temperature? A. The alcohol in a thermometer expands. B. The brass on a bent bime

tallic strip is on the outside curve. C. The column of liquid in a thermometer moves up three degrees. D. A bimetallic strip bends so that the steel is on the outside curve.
Physics
2 answers:
solmaris [256]3 years ago
7 0

Answer:

A bimetallic strip bends so that the steel is on the outside curve.

Explanation:

A bimetallic strip is a combination of two different metals. The linear  coefficient of expansion of various metals are different, depending on their characteristics. For example, when a bimetallic strip of brass and steel are taken, thermal expansion coefficient of brass is more than that of steel.

That implies brass expands more than steel, for a given amount of heat supplied. So brass will curve outward since it becomes longer compared to steel. Steel will curve inwards.

Similarly, for cooling process where a drop in the temperature occurs, brass contracts more compared to steel and so Steel will be on outside curve.

Travka [436]3 years ago
3 0
D. A bimetallic strip bends so that the steel is on the outside curve.
You might be interested in
An insulated rigid tank contains 4 kg of argon gas at 450 kPa and 30°C. A valve is now opened, and argon is allowed to escape un
zheka24 [161]

Answer: The final mass of the tank is 2.46kg

Explanation: All shown in the attachment.

Assumptions:

i. Argon is treated as an ideal gas at the specified conditions.

ii. Isentropic relation of ideal gas applies at the given conditions.

4 0
2 years ago
The microwaves in a microwave oven are produced in a special tube called a magnetron. The electrons orbit the magnetic field at
Rama09 [41]

Answer:

<em>The magnetic field is 0.0857 T.</em>

Explanation:

The electrons orbit the magnetic field with a centripetal force equal to

F = \frac{mv^{2} }{r}

also, the force on an electron in a magnetic field is gotten as

F = Bqv

equating this two equations give

\frac{mv^{2} }{r} = Bqv

mv/r = Bq

where m is the mass of the electron = 9.11 x 10^-31 kg

v is the the linear speed of the electron

B is the magnetic field on the electron

r is the radius of the orbital movement

q is the charge on an electron = 1.602 x 10^-19 C

but, the linear speed v = ωr

where ω is the angular speed of the electron

substituting into equation above, we have

mωr/r = Bq

which reduces to

mω = Bq

finally, w know that the angular speed is related to the frequency of the electron by

ω = 2πf

we then finally have

2mπf = Bq

where f is the frequency emitted by the electron = 2.4 GHz = 2.4 x 10^9 Hz

substituting values into the equation, we have

2 x 9.11 x 10^-31 x 3.142 x 2.4 x 10^9 = B x 1.602 x 10^-19

B = (1.3734 x 10^-20)/(1.602 x 10^-19) = <em>0.0857 T</em>

= <em>85.7 mT</em>

7 0
3 years ago
Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a ligh
jeyben [28]

Answer:

Well, it's because the air offers much greater resistance to the falling motion of the feather than it does to the brick. ... Galileo discovered that objects that are more dense, or have more mass, fall at a faster rate than less dense objects, due to this air resistance. A feather and brick dropped together.

Explanation:

6 0
3 years ago
a particle moves in an elliptical or circular motion. it is most likely a particle in which type of wave
Strike441 [17]
Surface waves from an earthquake shake the ground back and forth and up and down. So basically in a circular motion. This wave is the most dangerous wave released during and earthquake and it comes after the p and s waves. The Surface wave is the last wave that comes after the other 2. So yea' these surface waves move in a circular motion.
5 0
3 years ago
SOUND Moves through a (blank) or (blank) material when the atoms within the material push against each other , transferring the
harina [27]
It is probably transversal.
The particles vibrate perpendicular to the direction of an energy transmission.
I hope this helps.
7 0
3 years ago
Other questions:
  • What are the activities involved in scientific method?
    9·1 answer
  • What is the current in a series circuit that has two resistors (4.0 ohms and
    13·1 answer
  • How does a crowbar work?
    11·1 answer
  • Pressure increases with depth towards the center of earth. In which layer would you expect pressure to be the greatest.
    10·2 answers
  • According to Newton’s first law of motion, if a person is swinging a rock st the end of a string and the string breaks, what wil
    14·1 answer
  • Explain how objects in motion have kinetic energy, use examples
    13·1 answer
  • AM radio waves have longer wavelength than FM radio waves? true or false?
    7·1 answer
  • Potential and kinetic energy
    14·1 answer
  • Giving away 50 points
    15·2 answers
  • What is newton's 3rd law of physics ​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!