When we're working problems that involve a pendulum, we almost always IGNORE anything else besides gravity.
Anything else besides gravity that could influence the motion of a pendulum is something that we would eliminate if we could.
Those are air resistance, mass of the string, friction at the top suspension point, and the Coriolis force, due to the Earth's rotation, that tries to change the plane of the pendulum's swing.
This question is probably fishing for the answer "<em>friction</em>".
Answer:
L = 100.24 mH
Explanation:
Given that
V= 11.5 V
I= 0.62 A
V(rms) = 24 V
f= 60 Hz
I(rms) = 0.57 A
resistance R
V= I R
11.5 = 0.62 R
R= 18.54 ohm
impedance Z given
V(rms) = I(rms) Z
24 = 0.57 Z ,Z= 42.10 ohm
inductor impedance
L= 0.10024 H
L = 100.24 mH
This is the inductance .
Answer:
Height of wall is 12 ft.
Explanation:
In the shown figure, AB denotes the height of the wall, BC denotes the distance between foot of the ladder and wall and AC denotes the length of the ladder.
Let h be the height of wall. By Pythagoras Theorem,
(AB)² + (BC)² = (AC)²
According to the problem, AC = 13 ft, AB = h ft and BC = (h - 7) ft:
h² + (h-7)² = (13)²
h² + h² + 49 - 14h = 169
2h² - 14h - 120 = 0
h² - 7h - 60 = 0
By mid-term splitting,
h² - 12h + 5h - 120 = 0
h(h - 12) + 5(h - 12) = 0
(h - 12) x (h + 5) = 0
h = 12 ft or h = -5 ft
Since, height of wall cannot be negative. Hence, the height of wall is 12 ft.
Answer:
The new angular velocity will be "80.73 rad/sec".
Explanation:
The given values are:
Angular velocity, W = 20 rad/s
M = 30 N
Time, t = 5 seconds
As we know,
On putting the values in the above formula, we get