Uniform Circular Motion: A 2.0-kg ball is moving with a constant speed of 5.0 m/s in a horizontal circle whose diameter is 1.0 m. What is the magnitude of the net force on the ball?
A. 0 N
B. 20 N
C. 40 N
D. 50 N
E. 100 N
Answer: E
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The unit of force in the SI system is
a) kilogram b) m/s c) meter d) newton
The specific heat of ice is 2.10 kJ/kg src="https://sciemce.com/media/4/d5e212f71484de1632.png" class="w-image" />?
the heat of fusion for ice at 0
is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg 
and the heat of vaporization of water at 100
is 2256 kJ/kg. What is the final equilibrium temperature when 20.0 grams of ice at Error! Hyperlink reference not valid.Error! Hyperlink reference not valid.15.0
is mixed with 5.00 grams of steam at 100
A. 44.1
B. 48.9
C. 52.7
D. 58.0
E. 65.2
Carbon-14 Dating: An archaeologist finds the 14C in a sample of 2.10 g of material to be decaying at 107 Bq. A modern 1.00-g sample of the same material decays at 151 Bq,and assume this rate has also held in the past. The half-life of 14C is 5730 years. How old is the sample?
A. 8980 years B. 6230 years C. 17,000 years D. 8530 years
Briefly explain how astronomers use the Zeeman effect to measure magnetic fields on the Sun
What will be an ideal response?