Alicia intends to swim to a point straight across a 100 m wide river with a current that flows at 1.2 m/s. She can swim 2.5 m/s in still water. At what angle, measured from the upstream direction, must she swim upstream to achieve her goal?
What will be an ideal response?
61°
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When a tube of diameter d is placed in water, the water rises to a height h. If the diameter were half as great, how high would the water rise?
A) 4h B) h/2 C) 2h D) h/4 E) h
A small metal sphere is suspended from the conducting cover of a conducting metal ice bucket by a non-conducting thread. The sphere is given a negative charge before the cover is placed on the bucket. The bucket is tilted by means of a non-conducting material so that the charged sphere touches the inside of the bucket. Which statement is correct?
A. The negative charge remains on the metal sphere. B. The negative charge spreads over the outside surface of the bucket and cover. C. The negative charge spreads over the inside surface of the bucket and cover. D. The negative charge spreads equally over the inside and outside surfaces of the bucket and cover. E. The negative charge spreads equally over the sphere and the inside and outside surfaces of the bucket and cover.
A circular loop (area = 0.20 m2) turns in a uniform magnetic field with B = 0.13 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is (?) rads and is decreasing at the rate of 0.50 rad/s, what is the magnitude of the emf induced in the loop?
a. zero b. 13 mV c. 26 mV d. 20 mV e. 18 mV
For normal household temperatures, a comfortable relative humidity is
a. 100% b. 0% c. 25% d. 50%