A car enters a level, unbanked semi-circular hairpin turn of 300 m radius at a speed of 40 m/s. The coefficient of friction between the tires and the road is ? = 0.25. If the car maintains a constant speed of 40 m/s, it will
A. attempt to dig into the road surface.
B. tend to veer toward the center of the semicircle.
C. arrive safely at the end of the semicircle.
D. tend to veer toward the outside of the circle.
E. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.
Answer: D
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Latent Heats: A substance has a melting point of 20°C and a heat of fusion of 3.6 × 104 J/kg. The boiling point is 150°C and the heat of vaporization is 7.2 × 104 J/kg at a pressure of one atmosphere. The specific heats for the solid, liquid, and gaseous phases are 600 J/kg ? K (solid), 1000 J/kg ? K (liquid), and 400 J/kg ? K (gaseous). How much heat is given up by 2.80 kg of this substance when it is cooled from 170°C to 86°C at a pressure of one atmosphere?
A. 400 kJ B. 200 kJ C. 300 kJ D. 440 kJ E. 640 kJ
Which of the following best describes the web design concept of alignment?
A. A contrast between light and dark colors. B. The trend of using RWD to determine layout. C. The placement of objects in fixed or predetermined positions, rows, and columns. D. Meeting target audience expectations.
In noting that our world is "differentiated," we mean that:
A) the density of its materials decreases as you go downward toward the core. B) the Earth has evolved in a different pattern than any other planet. C) the iron and nickel core is denser than the silicate mantle and crust. D) radioactive heating in the core is at a slower pace than when the Earth was new. E) the Earth's magnetic field is different now in polarity than it was 700,000 years ago.
You have an empty 2-liter soda bottle and an empty 12-oz soda bottle. Which one has the higher frequency when you blow across the top? transverse waves
A. the 2-liter bottle B. the 12-oz bottle C. both have the same frequency D. depends on how hard you blow