<span>The amount of heat energy needed to increase the temperature of a substance by </span>
<span> is given by:
</span>
<span>
where m is the mass of the substance, Cs is its specific heat capacity and </span>
<span> is the increase in temperature of the substance.
In this problem, we have a certain mass m of gold, with specific heat capacity </span>
<span>, to which we add Q=2825 J of energy. Its temperature increases by </span>
<span>. Therefore, if we re-arrange the previous equation, we can find the mass of the block of gold:
</span>
<span>
So, the correct answer is B.</span>
In order to find number of neutrons, use this formula: Mass number-number of protons. The number of protons is equal to the atomic number.
Using this, you do 96-34 to get 62 neutrons. Hope this is helpful!
Note that the density of mercury is
(i) 13545 kg/m^3 at 20 deg.C
(ii) 13472 kg/m^3 at 50 deg, C
For a given mass, M kg, by using the volume at 20 deg. C, obtain
M = (13545 kg/m^3)*(0.002 m^3) = 27.09 kg .
Let V m^3 = volume at 50 deg. C
Then
(13472 kg/m^3)*(V m^3) = 27.09 kg
V = 27.09/13472 = 0.002010837 m^3
Answer:
The closest answer is A. 0.002010812 m^3
Answer
given
Case 1-Speed of car 50 Km/h for 15 min
Case 2-Speed of car 85 Km/h for 19 min
Case 3 - Speed of car 60 km/h for 55 min
lunch break time = 25 min
a) total distance travel
we know,
distance = speed x time
D = 94.42 Km
b)