You observe the peak brightnesses of two white dwarf supernovae. Supernova A is only 1/4 as bright as Supernova B. What can you say about their relative distances?
A) Supernova A is twice as far away as Supernova B.
B) Supernova A is 4 times as far away as Supernova B.
C) Supernova B is 4 times as far away as Supernova A.
D) Supernova B is twice as far away as Supernova A.
E) We can't say anything about their relative distances because we do not have enough information.
A
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A huge cannon is assembled on an airless planet having insignificant axial spin. The planet has a radius of 5.00 × 106 m and a mass of 3.95 × 1023 kg
The cannon fires a projectile straight up at 2000 m/s. An observation satellite orbits the planet at a height of 1000 km. What is the projectile's speed as it passes the satellite? (G = 6.67 × 10-11 N ? m2/kg2) A) 1500 m/s B) 1380 m/s C) 1610 m/s D) 1280 m/s
The activity of a radioactive source is often
measured in a unit called? a) the joule b) the u c) the microgram d) the cpm
Which is a distinguishing characteristic of the Jovian planets? a. Jovian planets are rocky
b. Jovian planets are geologically inactive. c. Jovian planets have rings. d. Jovian planets have only one or two moons. e. Jovian planets have high albedos.
You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind and you perceive the frequency as 1340 Hz
You are relieved that he is in pursuit of a different speeder when he continues past you, but now you perceive the frequency as 1300 Hz. What is the speed of the police car? The speed of sound in air is 343 m/s. A) 38.4 m/s B) 30 m/s C) 39.2 m/s D) 40.1 m/s E) 41.7 m/s