The 4 new ‘planets' Galileo discovered are called the ___________________________
Fill in the blank(s) with correct word
Galilean moons
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A vertical wire carries a current straight up in a region where the magnetic field vector points due North. What is the direction of the resulting force on this current?
A) North B) downward C) East D) West E) South
The axis of rotation of a top changes its direction as the top spins because:
a. the inertia of the top keeps its orientation changing. b. conservation of rotational motion keeps the direction changing if it was changing to start. c. rotational kinetic energy causes the direction to shift. d. gravitational force exerts torque on the top. e. angular momentum is conserved.
To calculate the masses of stars in a binary system, we must measure their ________
A) luminosities and distance from Earth B) orbital period and average orbital distance C) absolute magnitudes and luminosities D) spectral types and distance from Earth
Venus's crust is thicker than Earth's because
A. Venus has little internal activity, keeping the crust from melting. B. the high temperatures at the surface of Venus have baked the crust. C. volcanic eruptions continuously add more material to the surface. D. rocks on Venus melt at higher temperatures.