A chemical reaction is balanced by applying all except which of the following principles?
a. No atoms are gained, lost, or changed in identity.
b. Only the numbers preceding formulas can be changed.
c. The set of smallest whole numbers should be used.
d. Subscripts in the formulas may be changed if necessary.
d
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A block lies on a smooth inclined plane tilted at an angle of 35° to the horizontal
(a) Draw the free-body diagram for the block. (b) Determine the block's acceleration as it slides down the inclined plane. (c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline. (d) How long did it take the block to reach the bottom of the inclined plane?
An oil film floats on a water surface. The indices of refraction for water and oil, respectively, are 1.333 and 1.466 . If a ray of light is incident on the air-to-oil surface at an angle of 41.9° with the normal, what is the incident angle at the oil-to-water surface?
a. 30.1° b. 27.1° c. 37.4° d. 41.9° e. 33.5°
The number of electrons in an atom of an element is the same as the element's
a. atomic number. b. period number. c. mass number. d. group number.
A child is trying to throw a ball over a fence. She gives the ball an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground and the fence is 2.0 m high
The ball just clears the fence while still traveling upwards and experiences no significant air resistance. How far is the child from the fence? A) 0.73 m B) 1.6 m C) 2.7 m D) 3.8 m E) 7.5 m