Author Question: A child stands on a playground merry-go-round a distance of 1.50 m from the rotation axis. The ... (Read 74 times)

Metfan725 · **on:** Jul 29, 2018

A child stands on a playground merry-go-round a distance of 1.50 m from the rotation axis. The coefficient of static friction between the child's shoes and the surface of the merry-go-round is 0.700.

Assuming the acceleration of gravity is 9.81 m/s2, what is the maximum constant angular speed of the merry-go-round for which the child will not start to slide? A)

6.45 rad/s
B)

1.32 rad/s
C)

2.14 rad/s
D)

4.58 rad/s
E)

8.32 rad/s

Question 2

The filament in a light bulb has a diameter of 0.050 mm and an emissivity e = 1.0. The temperature of the filament is 3000C. How long should the filament be in order to radiate 60 W of power?

The Stefan-Boltzmann constant is 5.67 10-8 W/(m2K4).
A)

11 cm

B)

9.4 cm

C)

8.6 cm

D)

7.2 cm

E)

5.9 cm