Which of the following characteristics of the Earth are essential to the existence of life 1. Earth's size causes acceleration due to gravity to be 9.8 m/s2.
2. Earth's atmosphere is composed of mostly nitrogen with oxygen and carbon
dioxide.
3. Earth's surface has an abundance of silicon oxide in the form of
sand.
4. Earth's surface temperature ranges from -88°C to 58°C.
5. Earth's magnetic field repels some solar radiation from reaching the surface.
A. 2 , 4. B 1 , 2 , 4. C 2 , 4 , 5. D. 1 , 3

Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. half way betwween the two plates the electric field has magnitude e. if the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates?

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

Ineed this now one scientist feels that the changes in global climatic patterns may be good for the health of the biosphere. another scientist feels that sharp changes in climatic patterns could result in the extinction of the biosphere. which of these is the most likely reason the two scientists gave conflicting opinions on the impact of changes in the global climatic pattern? they do not have enough knowledge on the topic. they did not discuss the issue among themselves. they believe conflicting opinion strengthens science. they study different areas of science and have different scientific focuses.