Herschel's map of the Galaxy was too small because ________ blocked much of the starlight
Fill in the blank(s) with correct word
dust
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A normal force
A. is any everyday force B. is the gravitational force C. acts perpendicular to the surface D. is always equal to the weight of an object.
Why do some scientists think that Jupiter's existence may have been critical for life to evolve on Earth?
A) It prevented Earth from migrating outward and thus ensured a stable climate. B) It prevented Earth from migrating inward and thus ensured a stable climate. C) It kicked out many comets from the inner solar system through gravitational encounters, thus limiting the number of objects that could potentially hit the inner planets. D) Meteorites from Jupiter may contain bacteria that started life on Earth. E) It stabilized Earth's axis tilt and thus ensured a stable climate.
On a PV diagram, 2 curves are plotted, both starting at the same point (P1, V1) and both ending at the same increased volume (V2). One curve is for an isothermal process; the other is for an adiabatic process. Except for the common starting point, which curve is the upper one?
a. The isothermal process curve will always be the upper one. b. The adiabatic process curve will always be the upper one. c. Since they start at the same point and end at the same volume, they will coincide. d. The isothermal one will start out higher, but the adiabatic one will eventually cross it.
In a camera, the image focused on the film is
A. real and upright. B. real and inverted. C. virtual and upright. D. virtual and inverted. E. technically a mirage.