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3 years ago

The television station sends

Physics

1 answer:

puteri [66]3 years ago

6 0

Answer:

If I remember right I believe it's radio waves

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A sample of copper with a mass of 1.80 kg, initially at a temperature of 150.0°C, is in a well-insulated container. Water at a t

user100 [1]

Answer:

the mass of water is 0.3 Kg

Explanation:

since the container is well-insulated, the heat released by the copper is absorbed by the water , therefore:

Q water + Q copper = Q surroundings =0 (insulated)

Q water = - Q copper

since Q = m * c * ( T eq - Ti ) , where m = mass, c = specific heat, T eq = equilibrium temperature and Ti = initial temperature

and denoting w as water and co as copper :

m w * c w * (T eq - Tiw) = - m co * c co * (T eq - Ti co) = m co * c co * (T co - Ti eq)

m w = m co * c co * (T co - Ti eq) / [ c w * (T eq - Tiw) ]

We take the specific heat of water as c= 1 cal/g °C = 4.186 J/g °C . Also the specific heat of copper can be found in tables → at 25°C c co = 0.385 J/g°C

if we assume that both specific heats do not change during the process (or the change is insignificant)

m w = m co * c co * (T eq - Ti co) / [ c w * (T eq - Tiw) ]

m w= 1.80 kg * 0.385 J/g°C ( 150°C - 70°C) /( 4.186 J/g°C ( 70°C- 27°C))

m w= 0.3 kg

7 0

4 years ago

Through which material does the light travel the fastest?

eimsori [14]

The answer is A because it gives you a straight line which would make it easy for you go just go to end fast as a car .

6 0

3 years ago

Which products do you think required scientific knowledge to develop? Check all that apply.

gregori [183]

I think all of the above

6 0

3 years ago

Read 2 more answers

An object that gives off electromagnetic waves based on its temperature

My name is Ann [436]

Answer:

B) Blackbody radiation

MARK THIS AS BRAINLIEST PLEAWESSS :)

3 0

3 years ago

The specific heat of gold is 0.126 J/g°C. What mass of gold would change its temperature from 25.0 °C to 60.0 °C with the additi

fiasKO [112]

The amount of heat energy needed to increase the temperature of a substance by $\Delta T$ is given by:
 $Q=m C_s \Delta T$ 
where m is the mass of the substance, Cs is its specific heat capacity and $\Delta T$ is the increase in temperature of the substance.

In this problem, we have a certain mass m of gold, with specific heat capacity $C_s=0.126 J/g^{\circ}C$ , to which we add Q=2825 J of energy. Its temperature increases by $\Delta T=60-25=35 ^{\circ}C$ . Therefore, if we re-arrange the previous equation, we can find the mass of the block of gold:
 $m= \frac{Q}{C_s \Delta T} = \frac{2825J}{0.126\cdot 35}} =641 g$ 
So, the correct answer is B.

3 0

4 years ago

Read 2 more answers

The television station sends​

The television station sends