A proton initially moves left to right along the x axis at a speed of 7.0 × 10^3 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.70 m before coming to rest. What acceleration magnitude does the proton experience?
a. 7.0E+3 m/s2
b. 3.5E+7 m/s2
c. 1.8E+9 m/s2
d. 1.4E+12 m/s2
e. 2.5E+9 m/s2
b
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Which of the following statements about degeneracy pressure is not true?
A) Degeneracy pressure can continue to support an object against gravitational collapse even if the object becomes extremely cold. B) Degeneracy pressure arises from a quantum mechanical effect that we don't notice in our daily lives. C) Black holes form when gravity overcomes neutron degeneracy pressure. D) Degeneracy pressure can arise only from interactions among electrons.
The oldest evidence of life on Earth dates back to about how many years ago?
a. 65 million b. 3.8 million c. 3500 million d. 570 million
Kepler originally proposed that the planets were spaced apart by ____
a. five spheres b. five regular solids c. six tetrahedrons d. five epicycles e. six regular solids
Surrounding every moving electron is
A) a magnetic field. B) an electric field. C) both of these D) neither of these