A race car enters a flat 200-m radius curve at a speed of 20.0 ...

[AEWBW]

A race car enters a flat 200-m radius curve at a speed of 20.0 m/s while increasing its speed at a constant 2.00 m/s2. If the coefficient of static friction is 0.700, what will the speed of the car be when the car begins to slide?
 
  A)
 
  36.2 m/s
 
  B)
 
  24.3 m/s
 
  C)
 
  37.1 m/s
 
  D)
 
  28.7 m/s
 
  E)
 
  31.5 m/s

Question 2

Betelgeuse is a star in the constellation Orion. It radiates heat at the rate of 2.70  1030 W and has a surface temperature of 3000 K.
 
  Assuming that it is a perfect emitter, what is the radius of Betelgeuse? The Stefan-Boltzmann constant is 5.67  10-8 W/(m2K4).
  A)
 
  7.80  1010 m
  B)
 
  8.70  1010 m
  C)
 
  1.40  1011 m
  D)
 
  1.90  1011 m
  E)
 
  2.16  1011 m

[ebonylittles]

Answer to Question 1

A

Answer to Question 2

E

[AEWBW]

Excellent

[fatboyy09]

Gracias!