You stand near the earth's equator. A positively charged particle that starts moving parallel to the surface of the earth in a straight line directed east is initially deflected upwards. If you know there are no electric fields in the vicinity, a possible reason why the particle does not initially acquire a downward component of velocity is because near the equator the magnetic field lines of the
earth are directed
a. upward.
b. downward.
c. from south to north.
d. from north to south.
e. from east to west.
c
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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
a. the first law of thermodynamics b. the second law of thermodynamics c. specific heat capacity d. operation of a heat pump e. none of the above
Thermodynamic Devices: An ideal Carnot engine is operated as a heat pump to heat a room in the winter. The heat pump delivers heat to the room at the rate of 47 kJ per second and maintains the room at a temperature of 293 K when the outside temperature is 237 K. The power requirement to run the heat pump under these operating conditions is closest to
A. 9000 W. B. 7100 W. C. 20,000 W. D. 15,000 W. E. 11,000 W.
Which is the MOST important property of the element carbon that makes it ideal as a fundamental building block of biological molecules?
A) it is a very stable element B) it is the only element capable of bonding to itself C) it is a common element D) it readily forms chemical bonds with itself and other elements, allowing a wide variety of complex molecules to form
Answer the following statement(s) true (T) or false (F)
A battery always drives the same current through a circuit connected to it, no matter what the characteristics of that circuit might be.