If we double only the amplitude of a vibrating ideal mass-and-spring system, the mechanical energy of the system
A) increases by a factor of .
B) increases by a factor of 2.
C) increases by a factor of 3.
D) increases by a factor of 4.
E) does not change.
Answer: D
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Covalently bonded materials cannot be modeled with pair potentials, because the pair potential energy is only a function of interatomic ______________.
Fill in the blank(s) with the appropriate word(s).
Power: How many joules of energy are used by a 2.0 hp motor that runs for 1.0 hour? (1 hp = 746 W)
Fill in the blank(s) with the appropriate word(s).
The Chandrasekhar limit tells us that
a. accretion disks can grow hot through friction. b. neutron stars of more than 3 solar masses are not stable. c. white dwarfs more massive than 1.4 solar masses are not stable. d. stars cannot travel through space too fast e. stars with a mass less than 0.5 solar masses will not go through helium flash.
You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 1.8 × 107 m and its rotation period to be 22.3 hours
You have previously determined that the planet orbits 1.8 × 1011 m from its star with a period of 402 earth days. Once on the surface you find that the acceleration due to gravity is 59.7 m/s2. What are the mass of (a) the planet and (b) the star? (G = 6.67 × 10-11 N ? m2/kg2.) A) (a) 7.2 kg × kg, (b) 2.9 kg × kg B) (a) 1.3 kg × kg, (b) 2.9 kg × kg C) (a) 7.2 kg × kg, (b) 1.7 kg × kg D) (a) 1.3 kg × kg, (b) 1.7 kg × kg