My guess would be because the gravity from the Earth's core is constantly pulling the ball towards the ground. It's like the moon. Why doesn't the moon just float away in space? Because Earth's gravitational pull keeps it rotating around it. Therefore, the ball will always be pulled towards the core which keeps it from from rolling forever due to friction. But i may be wrong, even though this a quite a good answer, hope it is right!
<span>You are given a rectangular coil with sides 0.190 m by 0.220 m and has 501 turns of wire, a uniform magnetic field of 0.550 T that is perpendicular to the long axis and a voltage of 115V. The frequency is 780 per second.</span>
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Answer:
1.498×10⁵ Nm
Explanation:
From the question above,
Torque (T) = Force (F) × radius (r)
T = F×r............................. Equation 1
Where T = Torque, F = force, r = radius .
Given: F = 2.27×10⁵ N, r = 0.660 m
Substitute these values into equation 1
T = 2.27×10⁵×0.660
T = 1.498×10⁵ Nm
Hence the torque of the wheel is 1.498×10⁵ Nm
Answer:
a) -2.1731 m⁻s
Explanation:
L= length of thread, H= height of ball from ceiling,
N/B h= l cosФ, Ф=31°, l=2.7m, g=9.8m⁻s, m= 6kg
Required to find speed v, of the ball in m⁻s
ω=√g/h, =√g/lcosФ
⇒ ω=√9.8/2.7×cos31°
= 1.992rad⁻s
Now, speed in m/s, v= r.ω
where tanФ= r/h ⇒
r= h×cos 31°
r= 2.7 × cos(31) × tan(31) =-1.0909m
v= 1.992× -1.0909 = -2.1731 m/s