Circular Motion w7 part 2 Hw

In 1994, Susan Williams of California blew a bubble-gum bubble with a radius of 29.2 cm. If this bubble were rigid and the centripetal acceleration of the equatorial points of the bubble were 8.50 × 10-2 m/s2, what would the tangential speed of those points be?

• 0.16 m/s

• 0.26 m/s

• 0.33 m/s

• 0.78 m/s

An ostrich lays the largest bird egg. A typical diameter for an ostrich egg at its widest part is 12 cm. Suppose an egg of this size rolls down a slope so that the centripetal acceleration of the shell at its widest part is 0.28 m/s2. What is the tangential speed of that part of the shell?

• 0.13 m/s

• 0.16 m/s

• 0.25 m/s

• 0.19 m/s

A waterwheel built in Hamah, Syria, rotates continuously. The wheel’s radius is 20.0 m. If the tangential speed is 7.85 m/s, what is the magnitude of the centripetal acceleration of the wheel’s edge?

• 3.08 m/s

• 2.27 m/s

• 5.87 m/s

• 7.03 m/s

Gregg Reid of Atlanta, Georgia, built a motorcycle that is over 4.5 m long and has a mass of 235 kg. The force that holds Reid and his motorcycle in a circular path with a radius of 25.0 m is 1850 N. What is Reid’s tangential speed? Assume Reid’s mass is 72 kg.

• 12.27 m/s

• 15.38 m/s

• 14.56 m/s

• 18.23 m/s

With an average mass of only 30.0 g, the mouse lemur of Madagascar is the smallest primate on Earth. Suppose this lemur swings on a light vine with a length of 2.4 m, so that the centripetal force exerted is just 0.10 N. What is the lemur’s tangential speed at that point?

• 2.83 m/s

• 2.4 m/s

• 1.13 m/s

• 0.63 m/s

Pat Kinch used a racing cycle to travel 75.57 km/h. Suppose Kinch moved at this speed around a circular track. If the combined mass of Kinch and the cycle was 92.0 kg and the average force that maintained his circular motion was 12.8 N, what was the radius of the track?

• 3170 m

• 3350 m

• 2895 m

• 1280 m

Gregory House used a racing cycle to travel around a circular track at the speed of 22.5 m/s. If the combined mass of House and the cycle was 98.0 kg and the average force that maintained his circular motion was 35.6 N, what was the radius of the track?

• 1394 m

• 1562 m

• 1225 m

• 1356 m

During a "Sillas Locas" competition that was played in a party, Rick Hunter, a 75 kg male, was the winner. He ran around a circular track with a radius of 5 m. What force kept him able to maintain his motion around the last chair, if the average tangential speed reached was 2 m/s?

• 60 N

• 55 N

• 65 N

• No lo sé, Rick. Parece falso.

The largest salami in the world, made in Norway, was more than 20 m long. If a hungry mouse ran around the salami’s circumference with a tangential speed of 0.17 m/s, the centripetal acceleration of the mouse was 0.29 m/s2. What was the radius of the salami?

• 0.10 m

• 0.25 m

• 0.18 m

• 0.33 m

A dog sits 2.50 m from the center of a merry-go-round and revolves at a tangential speed of 1.80 m/s. If the dog’s mass is 22.5 kg, what is the magnitude of the centripetal force on the dog?

• 29 N

• 35 N

• 38 N

• 32 N