Answer:
The last two bearings are
49.50° and 104.02°
Explanation:
Applying the Law of cosine (refer to the figure attached):
we have
x² = y² + z² - 2yz × cosX
here,
x, y and z represents the lengths of sides opposite to the angels X,Y and Z.
Thus we have,
or
substituting the values in the equation we get,
or
or
X = 26.47°
similarly,
or
or
Y = 49.50°
Consequently, the angel Z = 180° - 49.50 - 26.47 = 104.02°
The bearing of 2 last legs of race are angels Y and Z.
The first one accelerate at 2m/s
the second one accelerates at 1.6666m/s
therefore statement b. the 10kg object is your answer
hope this helps :)
Answer:
60kgm/s
Explanation:
Given parameters:
Mass of frisbee = 5kg
Final speed = 12m/s
Unknown:
Impulse of the frisbee = ?
Solution:
The impulse of the frisbee is the same as the change in momentum.
It is given as:
Impulse = mass (Final velocity - Initial velocity)
Impulse = 5(12 - 0) = 60kgm/s
We can do dimensional analysis in this particular problem. We do as follows:
PEs = 1/2 kx^2
kg . m^2 /s2 [=] k (m)²
The units in the left side should be the same units as the resulting units in the right side.
kg . m^2 /s2 [=] (kg/s²) (m)²
Therefore, the units of k should be kg/s².