In the winter, monarch butterflies travel from the United States to Mexico, where the weather is warmer. They return to the Unit
2 answers:
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Answer:
part (a)
part (b) N = 79.61 rev
part (c)
Explanation:
Given,
- Initial speed of the wheel =
- total time taken = t = 20.0 sec
part (a)
Let be the angular acceleration of the wheel.
Wheel is finally at the rest. Hence the final angular speed of the wheel is 0.
part (b)
Let be the total angular displacement of the wheel from initial position till the rest.
We know, 1 revolution = rad
Let N be the number of revolution covered by the wheel.
Hence the 79.61 revolution is covered by the wheel in the 20 sec.
part (c)
Given,
- Mass of the pole = m = 4 kg
- Length of the pole = L = 2.5 m
- Angle of the pole with the horizontal axis =
Now the center of mass of the pole =
Weight component of the pole perpendicular to the center of mass =
momentum(p) = mass(m) x velocity(v)
KE = kinetic energy = 1/2 mv²
a.
the ratio of the momentum of the SUV to that of the car
b. the ratio of the KE of the SUV to that of the car