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
Harrizon [31]
3 years ago
8

Which group of elements are shiny, opaque, and have a high melting point?

Physics
1 answer:
vlabodo [156]3 years ago
3 0
The answer is A. Metals
You might be interested in
A man has a mass of 110kg . what is his weight?
Alisiya [41]
<span>1078 kgm / s would be the answer I hope this helps!!!</span>
5 0
3 years ago
Read 2 more answers
How much heat (in calories) are needed to raise the temperature of 60 g of water
laila [671]

Answer:

Well, each ml of water requires one calorie to go up 1 degree Celsius, so this liter of water takes 1000 calories to go up 1 degree Celsius.

Explanation:

3 0
2 years ago
How long does it take for a 3.5 kW electric water heater to heat 40 kg of water? from 20 ° C to 75 ° C? The specific heat capaci
iren [92.7K]

Answer:

2633.7 s

Explanation:

From the question,

Heat lost by the water heater = Heat gained by the water

Applying,

P = cm(t₂-t₁)/t.................. Equation 1

Where P = power of the heat, c = specific heat capacity of water, m = mass of water, t₁ = initial temperature, t₂ = final temperature, t = time

make t the subject of the equation

t = cm(t₂-t₁)/P.............. Equation 2

From the question,

Given: c = 4190 J/kgK, P = 3.5 kW = 3500 W, m = 40 kg, t₁ = 20°C, t₂ = 75°C

Substitute these values into equation 2

t = 4190×40(75-20)/3500

t = 9218000/3500

t = 2633.7 s

4 0
3 years ago
You want the current amplitude through a 0.450-mH inductor (part of the circuitry for a radio receiver) to be 1.90 mA when a sin
faust18 [17]

Answer:

Frequency required will be 2421.127 kHz

Explanation:

We have given inductance L=0.450H=0.45\times 10^{-3}H

Current in the inductor i=1.90mA=1.90\times 10^{-3}A

Voltage v = 13 volt

Inductive reactance of the circuit X_l=\frac{v}{i}

X_l=\frac{13}{1.9\times 10^{-3}}=6842.10ohm

We know that

X_l=\omega L=2\pi fL

2\times 3.14\times  f\times 0.45\times 10^{-3}=6842.10

f = 2421.127 kHz

6 0
3 years ago
Why is it important for engineers to design bumper cars safely
rosijanka [135]

Answer:

Cars have bumpers designed to protect the body of the car from minor damage during low-speed collisions. ... They will use the engineering design process to design and build bumpers to protect the main parts of their car from damage, and use their knowledge of Newton's third law to explain what they observe.

Explanation:

3 0
3 years ago
Read 2 more answers
Other questions:
  • Consider this situation: A rope is used to lift an actor upward off the stage. Of the forces listed, identify which act upon the
    13·2 answers
  • Biological systems use free energy based on empirical data that all organisms require a constant energy input. The first law of
    15·1 answer
  • Scientist have been able to determine the composition of Earth's layers by:
    14·1 answer
  • The diameter of a segment of an artery is reduced by a factor of two due to an obstruction. Assume that the flow is incompressib
    7·1 answer
  • A point charge Q is located a distance d away from the center of a very long charged wire. The wire has length L &gt;&gt; d and
    11·1 answer
  • A student walks 350 m [S], then 400 m [E20°N], and finally 550 m [N10°W]. Using the component method, find the resultant (total)
    14·1 answer
  • What is nuclear energy
    5·1 answer
  • Drugs that slow brain and body activities are called
    8·2 answers
  • describe the relationship between the direction of the velocity vector and the direction of the acceleration for a body moving i
    5·1 answer
  • Hellowww..... =)<br><br>What is atomic number ?..​
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!