FIrst let's convert the angular distance covered by the wheel into radians. We know that
Therefore, 2 revolutions correspond to
The average angular speed of the wheel is given by the ratio between the angular displacement and the time taken:
where in our problem,
and t=4.0 s, so the angular speed of the wheel is
Answer:
88.89 cm/s or 0.89 m/s.
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 0 cm/s
Distance travelled (s) = 120 cm
Time (t) = 2.7 s
Final velocity (v) =.?
The final velocity of the marble can be obtained as follow:
s = ½(v + u)t
120 = ½ × (v + 0) × 2.7
120 = (v + 0) × 1.35
120 = 1.35v + 0
120 = 1.35v
Divide both side by 1.35
v = 120/1.35
v = 88.89 cm/s
We may want to express the velocity in m/s. This can be obtained as follow:
100 cm/s = 1 m/s
Therefore,
88.89 cm/s = 88.89 cm/s × 1 m/s /100 cm/s
88.89 cm/s = 0.8889 m/s
88.89 cm/s = 0.89 m/s
Thus, the marble's final velocity is 88.89 cm/s or 0.89 m/s
Heya!!
For calculate force, lets applicate second law of Newton:
<u>Δ Being Δ</u>
F = Force = ?
m = Mass = 50 kg
a = Aceleration = 7,2 m/s²
⇒ Let's replace according the formula:
⇒ Resolving
Result:
The force is <u>360 Netwons.</u>
Good Luck!!