An object accelerates when it slows or its direction of movement changes
a. true
b. false
Answer: a. true
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A real (non-Carnot) thermodynamic engine, operating between thermal energy reservoirs at temperatures of 450 K and 270 K, performs 3.3 kJ of net work, and rejects 8.2 kJ of energy in a single cycle
(a) What is the thermal efficiency of this thermodynamic engine? (b) What is the maximum efficiency it could possibly have?
Between the crust and the outer core lies the region called the ______________
Fill in the blank(s) with correct word
Microscopes are inherently limited by the wavelength of the light used. How much smaller (in order of magnitude) can we "see" using an electron microscope whose electrons have been accelerated through a potential difference of 50000 V than using red light (500 nm)?
a. 3 b. 4 c. 5 d. 6 e. 14
A beam of light in water (n = 1.33 ) enters a glass slab (n = 1.50 ) at an angle of incidence of 60.0°. What is the angle of refraction?
A) 27.5° B) 39.8° C) 60.0° D) 90.0° E) 50.2°