What person is known as the "father of chemistry" for his many contributions, including the law of conservation of mass?
a. Boyle
b. Lavoisier
c. Mendeleev
d. Dalton
b
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The statement "It will be 87°F today" is an example of what
What will be an ideal response?
If the distance to the nearest star is 4.2 light-years, then
a. the star is 4.2 million AU away. b. the light we see left the star 4.2 years ago. c. the star must have formed 4.2 billion years ago. d. the star must be very young. e. the star must be very old.
Metric System: A weight lifter can bench press 171 kg. How many milligrams is this?
A. 1.71 × 108 mg B. 1.71 × 109 mg C. 1.71 × 107 mg D. 1.71 × 106 mg
The following force vectors act on an object: i) 50.0 newtons at 45.0 degree north of east and ii) 25.0 newtons at 30.0 degree south of east. Which of the following represents the magnitude of the resultant and its angle relative to the easterly direction?