In a steam engine, steam at 140°C in a turbine does work on an external system, and the steam leaves the turbine at 100°C. The efficiency of the steam engine is 5%. The relevant physical principle is the first law of thermodynamics
Indicate whether the statement is true or false
F
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If the central engine for our Milky Way is a black hole of 3 million solar masses, then it has an event horizon about ________ kilometers across
Fill in the blank(s) with correct word
Particle A (mass = m, charge = Q) and B (mass = m, charge = 5 Q) are released from rest with the distance between them equal to 1.0 m. If Q = 12 ?C, what is the kinetic energy of particle B at the instant when the particles are 3.0 m apart?
a. 8.6 J b. 3.8 J c. 6.0 J d. 2.2 J e. 4.3 J
Why are collisions between asteroids in the asteroid belt rare?
A) The average distance between asteroids is millions of kilometers. B) All asteroids orbit in perfect circular orbits at the same speed. C) Jupiter's gravity keeps asteroids apart. D) The gas surrounding the asteroids help them repel each other before colliding. E) There are only a few asteroids in the solar system.
A coil with a self-inductance of 6.0 H is connected to a dc source through a switch. As soon as the switch is closed at t = 0 s, the rate of change of current is 2.0 A/s. What is the emf induced in this coil at t = 0 s?
A) 6.0 V B) 3.0 V C) 12 V D) 0.33 V E) 0 V