A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s2. What is the tension in the string?
a.
49 N
b.
36 N
c.
62 N
d.
13 N
e.
52 N
b
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Charges of 4.0 µC and -6.0 µC are placed at two corners of an equilateral triangle with sides of 0.20 m. At the third corner, what is the electric field magnitude created by these two charges? (ke = 8.99 × 10^9 N•m2/C2)
a. 3.1 × 10^6 N/C c. 4.8 × 10^6 N/C b. 1.2 × 10^6 N/C d. 4.5 × 10^6 N/C
As a white dwarf cools its radius will not change because
a. pressure due to nuclear reactions in a shell just below the surface keeps it from collapsing. b. pressure does not depend on temperature for a white dwarf because the electrons are degenerate. c. pressure does not depend on temperature because the white dwarf is too hot. d. pressure does not depend on temperature because the star has exhausted all its nuclear fuels. e. material accreting onto it from a companion maintains a constant radius.
What is the phase of the Moon shown in the above image?
a. waxing gibbous b. third quarter c. waning gibbous d. first quarter
Angular Quantities: A chicken is running in a circular path with an angular speed of 1.52 rad/s. How long does it take the chicken to complete one revolution?
A. 4.13 s B. 2.07 s C. 118 s D. 4.77 s E. 8.26 s