Let the key is free falling, therefore from equation of motion
.
Take initial velocity, u=0, so
.
As velocity moves with constant velocity of 3.5 m/s, therefore we can use formula
From above substituting t,
.
Now substituting all the given values and g = 9.8 m/s^2, we get
.
Thus, the distance the boat was from the point of impact when the key was released is 10.60 m.
Answer:
The volume of an aluminum cube is 0.212 cm³.
Explanation:
Given that,
Edge of cube = 4.00 cm
Initial temperature = 19.0°C
Final temperature = 67.0°C
linear expansion coefficient
We need to calculate the volume expansion coefficient
Using formula of volume expansion coefficient
Put the value into the formula
We need to calculate the volume
The change temperature of the cube is
Put the value into the formula
We need to calculate the increases volume
Using formula of increases volume
Put the value into the formula
Hence, The volume of an aluminum cube is 0.212 cm³.