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
kodGreya [7K]
3 years ago
14

A burning piece of coal glows red on a lab table. A student wants to prevent the coal from transferring heat to him. He sets up

a metal shield between himself and the coal to prevent convection. Why will this not completely stop all of the heat transfer? The metal shield will heat up, and then heat the air on the student's side of the shield. The metal shield will cause more radiation to reach the student. The metal shield will not prevent heat transfer by conduction. The metal shield cannot block the flow of fluids.
Physics
2 answers:
Travka [436]3 years ago
6 0

Answer: Option (A) is the correct answer.

Explanation:

It is known that metals are good conductors of heat and electricity. As a result, they are able to pass on the heat in air or another substance.

For example, when a metal shield is placed between student and the coal to prevent conduction then transfer of heat will not stop completely.

This is because metal shield will transfer the heat into the air due to which air becomes hot and the student will feel the heat.

Thus, we can conclude that metal shield will not completely stop all of the heat transfer because the metal shield will heat up, and then heat the air on the student's side of the shield.

Dmitrij [34]3 years ago
4 0
A. The metal shield will heat up, and then heat the air on the student's side of the shield.
You might be interested in
If a source of waves produces 30 waves per second, what is the frequency in hertz?
sukhopar [10]

Answer:

30hz is the answer for the question

3 0
2 years ago
What would cause a beam of light to increase in wavelength and bend away from the normal? A) Passing from a round glass into a s
uranmaximum [27]

Answer:

i think it A sorry if i get it wrong but it should be A

Explanation:

8 0
2 years ago
Read 2 more answers
Explain why an equation may be homogenous with respect to its unit but still be incorrect​
natima [27]
When both sides of an equation give the same units, same numerical values, and same concept we refer to the equation as being correct. ... Removing constants from correct equations make them homogeneous but incorrect.
6 0
3 years ago
a desktop computer and monitor together draw about 2 A of current they plug into a wall outlet that is 120 V what is the Resista
Delvig [45]

Answer:

60 \Omega

Explanation:

the relation between current, voltage and resistance in an electrical circuit is given by Ohm's law:

V=IR

where V is the voltage, I is the current and R is the resistance. In this problem, the current is I=2 A, the voltage is V=120 V, therefore we can arrange the previous equation and find the resistance:

R=\frac{V}{I}=\frac{120 V}{2 A}=60 \Omega

7 0
3 years ago
A student's life was saved in an automobile accident because an airbag expanded in front of his head. If the car had not been eq
dexar [7]

Answer:    

Compared to windshield the airbag exerts much lesser force  

Explanation:

Impulse is defined as change in momentum of the object when it is acted upon by a force during interval of time

<em>Impulse = Impulsive force *time</em>

I = F*Δt

If the object should be bought to rest from certain velocity there should be change in momentum. If the duration in which the momentum is increased then there would be less force applied and hence less damage.

Airbags are used to reduce the force experience by the people when they are met with accident by extending the time required to stop the momentum.

During the collision, the passenger is carried towards the<em> windshield</em> and if they are stopped by collision with wind shield the force will be larger and more damage.But if they are hit with airbag then the force will be less due to increased time.

The change is momentum will be the same with or without momentum but its the time that decides the impact of force.By making it longer the force become less.

<em>Thus compared to the windshield the airbag exerts much lesser force.</em>

<em>   </em>

8 0
3 years ago
Other questions:
  • Can been seen but not projected?
    6·1 answer
  • The temperature of a 50 g sample of aluminum is raised from 20°c to 60°c when 440 cal of heat are added. the specific heat capac
    9·1 answer
  • Help pls pls i give reward
    10·2 answers
  • Nearly all physics problems will use the unit m/s^2 for acceleration. Explain why the seconds are squared. Why isn't the unit gi
    10·1 answer
  • Would you be doing more work by going up the stairs twice as fast?
    9·2 answers
  • A car starts from rest at a stop sign. It accelerates at 4.6 m/s^2 for 6.2 s , coasts for 2.1s , and then slows down at a rate o
    13·1 answer
  • What is the root cause of earths magnetic field?
    15·1 answer
  • A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floo
    14·1 answer
  • Physics Practice Help just need an explanation really not looking for an answer
    10·2 answers
  • Draw a ray diagram for a diverging lens that has a focal length of -10 cm when an object is placed 30 cm from the lens's surface
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!