The answer is the third one down. New evidence may contradict the old evidence of a certain theory.
Answer:
1)
2) See below
Explanation:
1)
The system of equations that we have in this problem is:
(1)
(2)
(3)
Here we want to solve the system for .
First of all, we isolate T from eq.(2):
And we substitute this expression into eq(1):
Solving for , we get
Now we can substitute this into eq(3):
And re-arranging for we find:
2)
We see that this solution satisfies all special cases. In fact:
- If ,
- If and , we get
Also, this solution has dimensions of acceleration. In fact:
- The term at the numerator is in the form , where mass is in kilograms and g is in meters per second squared (so, it is in the form mass*acceleration)
- The term at the denominator is a mass, so it is in kilograms
This means that is (mass*acceleration)/(mass), therefore it has dimensions of acceleration.
Answer:
The change in momentum of the car is 16380.8 kg.m/s
Explanation:
Given;
mass of the car, m = 1600 kg
time of motion, t = 4.20s
force of friction on the car, F = 3900 N
final velocity of the car after the brakes were applied, v = 0
The initial velocity of the car during the motion is calculated as;
The change in momentum of the car is calculated as;
ΔP = mu
ΔP = 1600 x 10.238
ΔP = 16380.8 kg.m/s
Well, those are good ones. Now how about a <u><em>thermometer</em></u> to <em>measure the temperature</em> ?