1- a 0.30 m radius automobile tire rotates how many radians after starting from

Question

1- a 0.30 m radius automobile tire rotates how many radians after starting from rest and accelerating at a constant 2.0 rad/s^2 over a 5.0 s interval?

a- 12.5 rad b. 25 rad c. 2.0 rad d. 0.50 rad

2- a ventilation fan has blades 0.25m in radius rotating at 20 rpm. what is the tangential speed of each blade tip?

a- .02 m/s b. .52 m/s c. 5.0 m/s d. 20 m/s

3- a point on the rim of a .25-m radius fan blade has a centripetal acceleration of .20 m/s^2. find the centripetal acceleration of a point 0.05 m from the center of the same wheel.

a- 0.01 m/s^2 b.0.02 m/s^2 c.0.04 m/s^2 d. 0.08m/s^2

4- at what angle shoulda curve 52m in radius be banked if no friction is required to prevent the car from slipping when traveling at 12 m/s?

a- 28 degrees b- 32 degrees c- 16 degrees d- 10 degrees

5- consider a child who is swinging. as she reaches the lowest point in her swing:

a- the tension in the rope is equal to her weight

b- the tension is equal to her mass times her acceleration

c- her acceleration is downward at 9.8 m/s2

d- none

6- an object ofa mass .5 kg is transported to the surface of planet x where the objects weight is measured to be 20N. The radius of the planet is 4.0 x 10^6 m. what free fall acceleration will the o.5 kg object experience when at the surface of planet x?

a- 48 m/s^2 b- 20 m/s^2 c- 16m/s^2 d- 40 m/s^2

7- if a planet has a radius 20% greater than that of the earth but has the same mass as the earth, what is the acceleration due to gravity at its surface?

a- 14m/s^2 b-12 m/s^2 c-8.2m/s^2 d- 6.8 m/s^2

8- a vault is openend by applying a force of 300 N perpendicular to the plane of the door, 0.80 m from the hinges find the torque due to this force about an axis through the hinges

a- 120 N.m b- 240 N.m c- 300 N.m d- 360 N.m

9- a bucket filled with water has a mass of 23 kg and is attatched to a rope, which in turn is wound around a 0.05 m radius cylider at the top ofa well what torque does the weight of water and bucket produce on the cylinder is the cylinder could rotate?

a- 34 N.m b- 17 N.m c-11N.m d-23 N.m

Explanation / Answer

1) b

2) b

3) c

4) c

5) d

6) c

7) d

8) b

9) c (11.281)

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