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Maru [420]
4 years ago
5

You have a 2.00 kg block of lead. Lead melts at 327.5°C. Cpb = 130.0 J/kg*C and △Hj for lead is 2.04x10^4 J/kg . Say you start a

t room temperature (25.0°C). How much heat must you transfer to melt all the lead?
Physics
1 answer:
faust18 [17]4 years ago
5 0

Answer:40,800joules

Explanation:given

Masss of lead is2kg

Latent heat for lead 2.04*10^4

Using the formula

Q=ml

Where Q is Quantity of heat required to melt the lead

=2*2.04*10^4= 40,800 joules

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Plants are important to the balance of nature because they provide food and
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Plants provide food and Carbon dioxide
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3 years ago
A wire with a mass of 1.14 g/cm is placed on a horizontal surface with a coefficient of friction of 0.200. The wire carries a cu
anzhelika [568]

Answer: B=0.0162T

Explanation:

let this sign be ∅ (titha in degrees)

let coefficient of friction of 0.200 be u

and i be current i= 1.41A

mass m=1.14g/cm m=0.0114g/m

To find the magnetic field from the north will be:

tan ∅= u

∅=tan^{-1}(0.200

∅=11.3°

The direction:

i L*B cos(∅)=  umg

divide both by iLcos(∅) to find B

B= \frac{umg}{iBcos(∅)}  where m=\frac{m}{L}

B= \frac{u(m/L)g}{icos(∅)}

B= \frac{0.200*0.0114*9.81}{1.41*cos(11.3)}

B=0.0162T

7 0
3 years ago
A truck going 15 km􏰀h has a head-on collision with a small car going 30 km􏰀h. Which statement best describes the situation
zlopas [31]

1. e) None of the above is necessarily true.

2.d) Without knowing the mass of the boat and the sack, we cannot tell.

5 0
3 years ago
7 One lb of Refrigerant 134a contained within a piston–cylinder assembly undergoes a process from a state where the temperature
julsineya [31]

Answer:

\Delta S = S_2-S_1 = 0.08835 \frac {BTU} {Lb ^ {\circ} R}

Explanation:

A) In order to solve the table it is necessary to consult tables A11-E and A10E for refrigerant R134-a

In this way we obtain that:

S_1 = S_f = 0.0648 \frac {BTU} {Lb. ^ {\circ} R}

In this way,

S_2 = S_f + x_2 (S_g-S_f) = 0.0902 + 0.5 (0.2161-0.0902)

S_2 = 0.15315 \frac {BTU} {Lb ^ {\circ} R}

In this way the entropy change is,

\Delta S = S_2-S_1 = 0.08835 \frac {BTU} {Lb. ^ {\°} R}

B) Whenever entropy yields a positive result, the process can be carried out adiabatically.

7 0
3 years ago
With the intensity at about half of maximum, how does the current change when you increase the frequency of the light?
PIT_PIT [208]

Answer:

Increase

Explanation:

Energy  of  given as follows

E = h f

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when high frequency light falls then it will increase the number of produce photon and that increase in number of photon will lead to increase in the number of electron.When number of electron will increase it mean that current will also increase.

So we can say that when frequency increase then current will increase.

4 0
3 years ago
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