Answer
169.2 J
Explanation
Given in the question,
mass of iron = 47g
specific heat capacity of iron = 0.450 (J/g 0C)
initial temperature = 12° C
final temperature = 20° C
The energy q needed to increase an object of mass m and specific heat capacity c by a temperature θ is given by:
q = mcΔt
q = 47(0.45)(20-12)
q = 169.2 J
Answer:
Speed, 
Explanation:
Given that,
Distance covered by the electron, d = 32 cm = 0.32 m
Time, t = 2 ns
We need to find the speed of an electron. Speed is equal to distance covered divided by time. So,

So, the speed of the electron is
.
False, Carbon usually forms four covalent bonds.
Question 2: Protons
Question 3: Electrons
Question 4: Protons
Question 5: Im pretty sure its electrons
The force must be made over a distance