On its own, a tow truck has a maximum acceleration of 3.0 m/s2. What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?
A) 2.5 m/s2
B) 2.0 m/s2
C) 1.5 m/s2
D) 1.0 m/s2
D
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You use the Doppler method to discover a planet around a nearby star that is very similar to the Sun; the velocity curve that has a period of 6 months. What can you conclude about the planet's orbital distance?
A) The planet's orbital distance is greater than 1 AU. B) The planet's orbital distance cannot be determined based on the information provided. C) The planet's orbital distance is less than 1 AU. D) The planet's orbital distance is exactly 1 AU.
Not only does the central engine of active galaxies and quasars require a black hole, but also ________ to provide the radiate energy
A) globular clusters for food B) a very strong magnetic field from neutron stars C) a source of high-energy electrons for synchrotron radiation D) an accretion disk of infalling matter E) a high rate of rotation for the black hole
Seyferts are spirals with quasar-like nuclei
Indicate whether the statement is true or false
The Moon's angular diameter in our sky is measured to be 0.5°. From this, we can find
a. the mass density of the Moon if we know its distance from the Earth. b. diameter of the Moon if we know the Moon's distance. c. diameter of the Moon with no other information about the Moon. d. distance to the Moon with no other information about the Moon.