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
Your answer is a new experiment, since it's something that hasn't been tried before, or has, but resulted in with lots of errors.
Answer:
4992 J
Explanation:
Force, F = 39 N
Distance, s = 128 m
Work done = force x distance
W = 39 x 128
W = 4992 J
Thus, the work done is 4992 J.
Answer:
X = 5.44 m
Explanation:
First we can calculate the normal force acting from the floor to the ladder.
W₁+W₂ = N
W1 is the weigh of the ladder
W2 is the weigh of the person
So we have:
The friction force is:
Now let's define the conservation of torque about the foot of the ladder:
Solving this equation for X, we have:
Finally, X = 5.44 m
Hope it helps!
Explanation:
current = velocity/resistance
I = V/R
15/4
current = 3.75A
hope this helps...
