This figure shows Hubble's law. If a galaxy is observed to be moving away from us at 30,000 (3 104) km/s, approximately how far away is it? (Hint: Be sure to read the axis labels carefully.)
A) 30,000 light-years
B) 1400 million light-years
C) 3000 million light-years
D) 1400 light-years
B) 1400 million light-years
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The first pulsar was discovered by __________ in November of 1967
a. Jocelyn Bell b. Isaac Newton c. Albert Einstein d. Walter Baade e. Edwin Hubble
Constant Acceleration Kinematics: A train starts from rest and accelerates uniformly until it has traveled 2.1 km and acquired a forward velocity of 24 m/s. The train then moves at a constant velocity of 24 m/s for 400 s. The train then slows down uniformly at 0.065 m/s2, until it is brought to a halt. The distance traveled by the train while slowing down is closest to
A. 4.4 km. B. 4.2 km. C. 4.0 km. D. 3.8 km. E. 3.6 km.
Mercury experiences extreme high and low temperatures between night and day because:
A) it is so close to the Sun. B) its dense atmosphere creates a runaway greenhouse. C) its oceans are much hotter than ours. D) Mercury has no axial tilt, with its equator always exposed to direct sunlight. E) it has no true atmosphere to moderate temperatures over the globe.
The thermal conductivity of concrete is 0.80 W/m-C° and the thermal conductivity of wood is 0.10 W/m-C°
How thick would a solid concrete wall have to be in order to have the same rate of flow through it as an 8.0 cm thick wall made of solid wood? (Assume both walls have the same surface area.)