An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its kinetic energy is a minimum?
A) at either A or B
B) midway between A and B
C) one-third of the way between A and B
D) one-fourth of the way between A and B
E) at none of the above points
A
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A sample of water, H2O, has a mass of 38.0 g. How many atoms of oxygen are in the sample? (oxygen has 16.0 g/mol, hydrogen has 1.00 g/mol, and NA = 6.02 × 10^23)
a. 3.34 × 10^22 b. 5.35 × 10^23 c. 1.27 × 10^24 d. 2.29 × 10^25
What is the resistance of a cylindrical metal rod 1.0 cm in diameter and 45 m long, if the resistivity of the metal is 1.4 × 10-8 ? ? m?
A) 0.0063 ? B) 0.0080 ? C) 0.80 ? D) 6.3 ?
Which of the following statements about the Moon is correct?
A. The Moon has a constant velocity. B. There is no net force acting on the Moon. C. Earth exerts a stronger force on the Moon than the Moon exerts on Earth. D. The Moon experiences a centripetal acceleration toward Earth.
Light strikes a flat water surface (n = 1.333) at the Brewster angle. Calculate the angle between the reflected and the refracted ray