Author Question: A race car enters a flat 200-m radius curve at a speed of 20.0 m/s while increasing its speed at a ... (Read 645 times)

AEWBW · **on:** Jul 29, 2018

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