How do we know that pulsars are neutron stars?
A) We have observed massive-star supernovae produce pulsars.
B) Pulsars and neutron stars look exactly the same.
C) No massive object, other than a neutron star, could spin as fast as we observe pulsars spin.
D) Pulsars have the same upper mass limit as neutron stars do.
E) none of the above
C
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The Jovian planets
a. are composed mainly of hydrogen and helium. b. have no solid surface. c. have rings. d. all of these.
Wave Characteristics: A laser beam takes 24 ms to travel from a rocket to the reflective surface of a planet and back to the rocket. How far is the rocket from this planet's surface? (c = 3.0 × 108 m/s)
A. 2400 km B. 1200 km C. 1800 km D. 3600 km E. 4800 km
Tension is actually a force that tends to
A) stretch something. B) compress something. C) break something. D) balance something.
In the diagram, if the current through R1 is 5 A up and if the current through R3 is 3 A up, what is the current in R2?
]
A. 8 A up
B. 8 A down
C. 2 A up
D. 2 A down
E. more information is needed