The force that causes Earth to orbit the Sun is due to gravity, while the force needed to keep Earth moving as it circles the Sun is
A) inertia.
B) due to gravity.
C) due to both inertia and gravity.
D) no force at all.
Answer: D
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An electron is projected horizontally with a speed of 
m exactly in the middle of two parallel plates at potentials of -40 V and 104 V, respectively. The plate separation distance is 3.0 cm. The plates are long enough that the proton, rather than passing completely between the plates, eventually strikes the plate sitting at 104 V potential. What is the speed of the proton when it strikes the plate? The mass of the electron is 
kg.
A. 
B. 
C. 
D. 
Text, images, and links that establish the website's value are used to answer a website visitor's ______ question.
A. Who? B. What? C. Why? D. Where?
The instability strip includes many main sequence stars
Indicate whether the statement is true or false
The thermal neutron cross section of a proton is 0.33 bn. If this cross-section were to represent the circular cross-sectional area of the proton presented to the neutron beam, what would be the radius of the proton?
A) 1.2 x 10-15 m B) 1.6 x 10-15 m C) 3.2 x 10-15 m D) 4.1 x 10-15 m E) 5.2 x 10-15 m