An object of mass 0.50 kg is transported to the surface of Planet X where the object's weight is measured to be 20 N. The radius of the planet is 6.0 × 10^6 m. What is the mass of Planet X? (G = 6.67 × 10^?11 N / m2/kg2)
a. 1.80E+18 kg
b. 5.40E+24 kg
c. 2.16E+25 kg
d. 1.80E+18 kg
c
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A straight wire is bent into the shape shown. Determine the net magnetic force on the wire
when the current I travels in the direction shown in the magnetic field
.
?
a.
2IBL in the ?z direction
b.
2IBL in the +z direction
c.
4IBL in the +z direction
d.
4IBL in the ?z direction
e.
zero
Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At which of the following times does the average angular acceleration equal the instantaneous angular acceleration?
a. 0.50 T c. 0.71 T b. 0.67 T d. all of the above
Sir William Herschel counted the number of stars in different directions, and getting similar numbers in each direction along the disk, concluded the Sun was near the center of a disk like collection of stars. Herschel came to the wrong conclusion about the Sun's location because
A. He did not know that interstellar dust made it hard for him to see a large part of the Milky Way's disk. B. The Sun's position in the Milky Way at that particular time was very unusual and skewed his results. C. He only counted globular clusters, and not regular stars. D. He was predisposed to believe the Sun was in the center of the Milky Way, and ignored data which disagreed with that conclusion.
Which of the following types of galaxies are typically reddest in color?
A) spirals B) ellipticals C) irregulars