Suppose you claim that you are feeling the effects of a gravitational field. How can you explain the fact that Al is weightless?
A) She is weightless because she is moving at constant velocity.
B) She is weightless because she is in a free-float frame.
C) She is weightless because she is in free-fall.
D) If you are in a gravitational field, then she cannot be weightless.
C
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A dumbbell-shaped object is composed by two equal masses, m, connected by a rod of negligible mass and length r
If I1 is the moment of inertia of this object with respect to an axis passing through the center of the rod and perpendicular to it and I2 is the moment of inertia with respect to an axis passing through one of the masses, it follows that A) I1 = I2. B) I1 > I2. C) I2 > I1.
Orbital resonances are a characteristic of some extrasolar systems but are not seen in our solar system
Indicate whether the statement is true or false
A 40-turn circular coil (radius = 4.0 cm, total resistance = 0.20 ?) is placed in a uniform magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies with time as given by B = 50 sin(10 ?t) mT where t is measured in s. What is the magnitude of the induced current in the coil at 0.10 s?
A. 50 mA B. 1.6 A C. 0.32 A D. zero E. 0.80 A
The objective lens of a refracting telescope has a focal length of 60 cm and the eyepiece a focal length of 8.0 cm. What is the angular magnification of the telescope?
A) 34 B) 480 C) 68 D) 0 E) 7.5