State the difference between pure translational and pure rotational motion
What will be an ideal response?
If an object has only (pure) translational motion every particle in it has the same instantaneous velocity, which means that the object is not rotating. An object may have only (pure) rotational motion - motion about a fixed axis if all of the particles of the object have the same instantaneous angular velocity and travel in circles about the axis of rotation.
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The coil of a generator rotates through one complete turn in a uniform magnetic field 50. times every second. When this generator is connected to an external load, the current through the load reverses directions
A) 25 times every second. B) 100 times every second. C) 75 times every second. D) 50 times every second. E) 200 times every second.
Household 120-V outlets are made to accept three-pronged plugs. One of the prongs attaches to the "live" wire at 120 V, and another attaches to the "neutral" wire that is connected to ground. What is the round third prong for?
a. It serves as a backup to the hot wire. b. It lets the appliance run if the neutral wire breaks. c. It connects the case of the appliance directly to ground for safety purposes. d. Nothing electrical, it is for mechanical sturdiness.
The ocean crust
A) becomes progressively younger away from the mid-ocean ridges. B) is the same age worldwide. C) becomes progressively older away from the mid-ocean ridge. D) ranges in age, the oldest ocean crust is in the Atlantic and the youngest is in the Arctic.
Magnifying Glass With the Image at Infinity: A lens of focal length 40 mm is used as a magnifier. The object being viewed is 5.3 mm long, and is positioned at the focal point of the lens. The user of the magnifier has a near point at 25 cm. What is the angular magnification of the magnifier?
A. 6.3 B. 5.6 C. 6.9 D. 7.5 E. 8.1