A car travels around 200 m radius flat curve at 40 m/s at ...

[Chloeellawright]

A car travels around 200 m radius flat curve at 40 m/s at constant speed. What is the minimum static coefficient of friction which allows it to travel at this speed without sliding?
 
  A)
 
  1.23
 
  B)
 
  0.815
 
  C)
 
  0.736
 
  D)
 
  0.952
 
  E)
 
  0.662

Question 2

A blacksmith is flattening a steel plate, 10 cm  15 cm  1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75, what is the total rate of radiation of energy?
 
  The Stefan-Boltzmann constant is 5.67  10-8 W/(m2K4). Ignore heat exchange with the surroundings.
  A)
 
  360 W
 
  B)
 
  760 W
 
  C)
 
  790 W
 
  D)
 
  850 W
 
  E)
 
  880 W

[frre432]

Answer to Question 1

B

Answer to Question 2

D

[Chloeellawright]

Excellent

[FergA]

Gracias!