Formative Assessment. 1. A mechanic needs to exert 385 mN of torque. He weighs 833 N and he stands on the handle of his wrench that is making a 17.0 o.

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Presentation transcript:

Formative Assessment

1. A mechanic needs to exert 385 mN of torque. He weighs 833 N and he stands on the handle of his wrench that is making a 17.0 o angle above the horizontal. How far from the center must he stand? (Be careful what you use for the angle) (0.483 m)

2. What is the acceleration of a flywheel with a moment of inertia of kg m 2 if a torque of 2.80 mN acts on it? (19.3 rad/s/s)

3. A m diameter flywheel has a moment of inertia of kg m 2. What is the angular acceleration of the flywheel if you exert 4.50 N tangentially at the edge to speed it up? (6.29 rad/s/s)

4. A m radius grinding disk is spinning at 1350 RPM. If it goes through 85.0 rotations being brought to rest by a 1.20 N frictional force applied tangentially at its edge, what is the moment of inertia of the disk? ( kg m 2 )

5. A 4.30 m diameter (cylindrical) merry go round going 45.0 RPM stops in 37.0 rotations because of an 8.30 N force applied tangentially at the edge. What is the mass of the merry go round? (162 kg)

more

A torque of 21.0 mN acts on a motor with a moment of inertia of 1.53 kg m 2. What is the angular acceleration? (13.7 rad/s/s)

A torque of 19.0 mN acts on a flywheel with a moment of inertia of 3.20 kg m 2. If it starts at rest, in what time will it go through 16.0 radians? (2.32 s)

A flywheel that is a m diameter thin ring with a mass of 16.0 kg would require what torque to accelerate from rest to 1120 RPM in 8.10 seconds? (30.9 mN)

What is the moment of inertia of a m radius flywheel if when you exert a tangential force of 11.5 N at the edge it accelerates from rest to 680. RPMs in 123 rotations? (0.904 kgm 2 )

A 161 kg 4.72 m diameter (cylindrical) merry go round is sped up from rest by a 25.0 N force applied tangentially at its edge. What is its speed in RPMs after 38.0 seconds? (47.8 RPM)

A 2.10 m radius, 351 kg (cylindrical) merry go round spinning at 75.0 RPM slows to a halt in 11.5 rotations. What force applied tangentially at the edge would cause this? (157 N)