A 20-G Bead Is Attached to a Light 120-Cm-Long String

question 100

Multiple Choice

A 20-g bead is attached to a light 120-cm-long string as shown in the figure.This bead moves in a horizontal circle with a constant speed of 1.5 m/s.What is the tension in the string if the angle α is measured to be 25°?

• A)0.089 N
• B)0.041 N
• C)0.20 N
• D)0.22 N
• E)0.46 N

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Definitions:

Pilot Device

A manual or automatic device that provides control input to a more complex system, often used to initiate, modulate, or stop functions.

Control Coil

An electromagnetic coil that is used to control the operation of a device, often found in relays, solenoids, and valves.

Differential Controls

Devices that function based on the difference in variables (such as temperature, pressure, or flow rate) to adjust or maintain system operation.

Mechanical Holding Circuit

A circuit design that maintains the current flow or signal, keeping a device like a relay activated even after the initial actuating signal is removed.