The efficiency of an engine can be defined as the
A. ratio of work done to energy input.
B. ratio of work done to energy exhausted.
C. ratio of heat exhausted to heat intake.
D. total amount of work performed.
Answer: A
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In the ASTM designation system of HSLA steels, the letter grade A following the three digits in the designation system indicates that this alloy is of the _________strength.
Fill in the blank(s) with the appropriate word(s).
Electric charge distributes itself on conducting surfaces
A) with greater concentration on more curved parts. B) such that the electric field inside is zero. C) both of the above D) none of the above
Force on a Moving Charge: A proton moving with a velocity of 4.0 × 104 m/s enters a magnetic field of 0.20 T. If the angle between the velocity of the proton and the direction of the magnetic field is 60°, what is the magnitude of the magnetic force on the proton? (e = 1.60 × 10-19 C)
A. 1.8 × 10-15 N B. 0.60 × 10-15 N C. 1.1 × 10-15 N D. 2.2 × 10-15 N E. 3.3 × 10-15 N
The quantum mechanical model of the hydrogen atom requires that if the principal quantum number is 6, there will be how many different permitted orbital quantum number(s)?
a. 5 b. 12 c. 6 d. 36 e. 13