Answer:
Explanation:
The acceleration of an object is given by
where
v is the final velocity
u is the initial velocity
t is the time it takes for the velocity to change from u to v
For the boat in the problem,
v = 10 m/s
u = 0
t = 2 s
Substituting, we find the acceleration
Answer:
Explanation:
Firstly, let's convert these length to meters , in order to work with the same units:
a. 400 millimeters
b. 22 kilometers
c. 170 meters
Here the lenght is already in meters
d. 3.3 centimeters
Now that we have all the lengths in meters, we can order them from shortest to longest:
or
Answer:
v = 64.14 m/s
Explanation:
First we are going to calculate the initial tension force in the wire.
How:
Where v: Wave's speed
T. Tension force
μ: Linear densityof the wire
Then:
Now we calculate the linear dilation of the copper, thus
ΔL = αLoΔT
Where α:The coefficient of linear expansion for copper
ΔL =
The Young's modulus is defined like:
Where E : The Young's modulus
A: cross-sectional area
Then
and the speed of the wave when the temperature is lowered is: