An iron robot falls from rest at a great height. Neglecting air resistance, what is its speed after it has fallen for 3.5 seconds?
A. 34.3 m/s
B. 9.8 m/s
C. 13.3 m/s
D. 9.8 m/s2
Answer: A
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In terms of the global warming that has been occurring on Earth over the past few decades, what is the key message from this figure?
A) Changes in the Sun's energy output (irradiance) cannot explain the observed warming. B) The Sun's energy output (irradiance) tracks quite well with the observed warming trend. C) The Sun's energy output (irradiance) and Earth's global average temperature both vary in an 11-year cycle. D) Scientists have no way to explain the observed global warming trend.
For electromagnetic radiation of intensity of
what is the rms value of the electric field?
a. 
b. 
c. 
d. 
e. 
Helium fusion is sometimes referred to as the _______________ because three helium nuclei are needed to make a carbon nucleus, and because the helium nucleus is called an alpha particle
Fill in the blank(s) with correct word
An electron, moving south, enters a magnetic field of certain strength. Because of this field the electron curves upward. What is the direction of the magnetic field?
A) downward B) towards the east C) upward D) towards the west E) towards the north