An automobile engine operates between a high temperature set by the burning of gasoline and the low temperature of the outside environment. If the engine has been running for some time, the engine is most efficient on ________ (hot or cold) days.

Fill in the blank(s) with the appropriate word(s).


cold

Physics & Space Science

You might also like to view...

What do scientists believe to have caused the Tunguska event?

a. a comet b. an iron asteroid c. a stony-iron meteorite d. a stony asteroid e. a carbonaceous chondrite

Physics & Space Science

A particle confined to motion along the x axis moves with constant acceleration from x = 2.0 m to x = 8.0 m during a 2.5-s time interval. The velocity of the particle at x = 8.0 m is 2.8 m/s. What is the acceleration during this time interval?

a. 0.48 m/s2 b. 0.32 m/s2 c. 0.64 m/s2 d. 0.80 m/s2 e. 0.57 m/s2

Physics & Space Science

What is the temperature in kelvins of the visible surface of the Sun?

a. 600 K b. 6 million K c. 6 billion K d. 6000 K

Physics & Space Science

Simple Harmonic Motion: The quartz crystal in a digital watch has a frequency of 32.8 kHz. What is its period of oscillation?

A. 30.5 µs B. 15.3 µs C. 95.8 µs D. 0.191 ms E. 9.71 µs

Physics & Space Science