A machine gun is attached to a railroad flatcar that rolls with negligible friction. If the railroad car has a mass of 6.35 × 10^4 kg, how many bullets of mass 35.0 g would have to be fired at 200 m/s off the back to give the railroad car a forward velocity of 0.56 m/s?
a. 5.1E–4
b. 2.0E+3
c. 6.5E+5
d. 5.1E+3
e. 6.5E+4
d
Physics & Space Science
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Energy Levels: A highly ionized atom with Z = 5 has only one electron left around it, in its ground state. How much more energy is required to finish the job and have a bare nucleus?
A. 340.0 eV B. 68.0 eV C. 10.9 eV D. 13.1 eV
Physics & Space Science
The mass of air inside an average mid-size automobile is about
A) 0.2 kg. B) 2 kg. C) 20 kg. D) 200 kg. E) 2000 kg.
Physics & Space Science
A 1 500-kg car rounds an unbanked curve with a radius of 52 m at a speed of 12.0 m/s. What minimum coefficient of friction must exist between the road and tires to prevent the car from slipping? (g = 9.8 m/s2)
a. 0.024 b. 0.23 c. 0.28 d. 1.2
Physics & Space Science
State Bernoulli's principle
Physics & Space Science