A car traveling 20 m/s rounds an 80 m radius horizontal curve with the tires on the verge of slipping. How fast can this car round a second curve of radius 320 m?
(Assume the same coefficient of friction between the car's tires and each road surface.)
A) 40 m/s
B) 70 m/s
C) 30 m/s
D) 1.6 × m/s
E) 80 m/s
A
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A) a liquid, such as liquid water B) a source of energy that can be used by life C) a source of nutrients D) an atmosphere
What happened at the start of the Cambrian Period?
A) the first oxygen-producing bacteria appeared B) the first dinosaurs appeared C) early humans first appeared D) an explosion of genetic diversity appeared, leading to the appearance of the first animals
In a neutral atom, the number of protons is equal to the number of ______________
Fill in the blank(s) with correct word
The value of the momentum of a system is the same at a later time as at an earlier time if there are no
a. collisions between particles within the system. b. inelastic collisions between particles within the system. c. changes of momentum of individual particles within the system. d. internal forces acting between particles within the system. e. external forces acting on particles of the system.