A compact object emitting very regularly spaced bursts of radio energy is known as a(n) _______________
Fill in the blank(s) with correct word
pulsar
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The Harvard College Observatory Computers from c. 1880 into the early 20th century were:
A) the first digital computers. B) not much different than cash registers. C) functionally similar to the modern 4- function calculator. D) a group of women who made important contributions to astronomy. E) mechanically operated adding machines.
A hydraulic lift is designed with an output cylinder that has 36 X the area of the input cylinder. If a force F is applied to the input cylinder, the output cylinder can supply a force equal to _______.
A. 1/6 F B. 1/36 F C. 6 F D. 36 F
Concrete is sold by the cubic yard. What is the mass, in kilograms, of 1.00 cubic yard of concrete that is 5.00 times as dense as water? (1.00 m = 1.094 yd, a cubic meter of water has a mass of 1,000 kg, and density is mass per unit volume.)
A) 764 kg B) 6550 kg C) 2420 kg D) 8730 kg E) 3820 kg
Is the mass of an atomic nucleus greater or less than the sum of the masses of the nucleons composing it? Why don't the nucleon masses add up to the total nuclear mass?
A) Greater. We need to add the masses of the surrounding electrons to the masses of the nucleons. B) Neither. The mass of the atomic nucleus is exactly the sum of the masses of the nucleons. C) Less. The individual nucleons have greater mass when separated from the nucleus. This additional mass is a result of the energy of separation. D) Greater. The mass of the atomic nucleus also has mass of the "atomic glue" that holds the nucleons together in the nucleus.