The temperature coefficient of resistivity is a quantity that is:
a. always positive.
b. always non-negative.
c. sometimes negative.
d. represented by the symbol ?.
c
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Thermodynamic Devices: If the efficiency of a reversible engine is 28%, what is its COP (performance coefficient) operated (a) as a refrigerator, and (b) as a heat pump?
Fill in the blank(s) with the appropriate word(s).
Two events occur 5.0 s apart in time and 3.0 s apart in space. A clock traveling at a speed of 0.60 can be present at both these events. What time interval will such a clock measure between the events?
A. 8.0 s B. 5.8 s C. 5.0 s D. 4.0 s E. 2.0 s F. Other (specify)
Since the Helium molecule (He) is 2 times as massive as the Hydrogen molecule (H2), the speed of sound in Hydrogen is ________ the speed in Helium
A) 1.41 times B) two times C) four times D) eight times E) 1/ times
Answer the following statement(s) true (T) or false (F)
1. A car moves backward 10 m in 2 s at a steady rate. The car’s speed is therefore –5 m/s. 2. An object is moving at a constant velocity. This means that an interaction must be delivering momentum to the object at a constant nonzero rate. 3.A bicyclist rounding a curve at a constant speed is receiving a nonzero net flow of momentum. 4. A human being’s weight could be 150 kg. 5. Suppose a moving cart (cart A) hits an identical cart (cart B) at rest. Cart B remains at rest after the collision, and cart A rebounds with a speed equal to its original speed. Cart B must have participated in some other interaction during the collision process,