A 0.003 0-kg lead bullet is traveling at a speed of 240 m/s when it embeds in a block of ice at 0°C. If all the heat generated goes into melting ice, what quantity of ice is melted?
Answers
Answered by
15
Gió · Ernest Z.
Jun 27, 2017
Answer:
I got
0.26 g
although I am not
100
%
sure of my method…
Explanation:
You know that the bullet carries a kinetic knergy
K
of:
K
=
1
2
m
v
2
=
1
2
(
0.0030 kg
)
(
240 m/s
2=
86.4 J
This energy will be used to melt the ice (OK, it is not true because most of it will be used to break it, but anyway...)
We can say that this energy as heat will be used to melt a mass
m
i
of ice as in:
Q
=
K
=
m
i
L
f
So, knowing that for the energy:
86.4 J = 0.020 64 kcal
we get:
0.020 64 kcal
=
80
m
i
kcal/kg
Rearranging:
m
i
=
0.020 64 kcal
80 kcal/kg
=
0.000 258 kg
=
0.26 g
thank you...i hope it helps
pallavi87:
u don't have sense
Similar questions
Math,
5 months ago
Geography,
5 months ago
Physics,
5 months ago
Social Sciences,
11 months ago
Social Sciences,
11 months ago
Math,
1 year ago
Math,
1 year ago