True/False: A machine’s efficiency can be over 100%. The rotational inertia of a body increases when...

True/False:

A machine’s efficiency can be over 100%.
The rotational inertia of a body increases when the distance of its mass from the rotation axis increases.
The Leaning Tower of Pisa is in stable equilibrium.
When a tin can is whirled in a horizontal circle, the net force on it acts inward.
You are in a car going over a cliff. You are weightless.

Expert Solution

genius_generous answered 2 years ago

A) Estimate the rotational inertia of a 60-kg ice skater by considering her body to be...

A) Estimate the rotational inertia of a 60-kg ice skater by considering her body to be a cylinder. Assume she's holding her arms tight to her torso, so they don't contribute significantly to her rotational inertia. Suppose that the distance from the center of rotation to the shoulders is 0.2 mm. B) Estimate the rotational inertia if she extends her arms fully. Suppose that the arm span of the ice skater is 1.6 mm and the arms make up 15...

A yo-yo has a rotational inertia of 900 g · cm2 and a mass of 100...

A yo-yo has a rotational inertia of 900 g · cm2 and a mass of 100 g. Its axle radius is 3.2 mm, and its string is 120 cm long. The yo-yo rolls from rest down to the end of the string. (a) What is the magnitude of its linear acceleration? (b) How long does it take to reach the end of the string? As it reaches the end of the string, what are its (c) linear speed, (d) translational...

How does rotational inertia play a role when a quarterback throws a ball so that it...

How does rotational inertia play a role when a quarterback throws a ball so that it spirals in flight? What about a figure skater spinning about her axis of symmetry with her arms outstretched and then pulling them in tight to her body?

true and false questions a. Any force F acting on a rigid body can be moved...

true and false questions a. Any force F acting on a rigid body can be moved to an arbitrary point O provided that a couple is added whose moment is equal to the moment of F about point O. b. The cross product obeys the commutative law, i.e. A x B = B x A c. The centroid and center of mass of an object will coincide if we assume that the object is of non-uniform density. d. In a...

True/False: Gravity is an example of inverse square behavior. A grindstone is rotating at constant rotational...

True/False: Gravity is an example of inverse square behavior. A grindstone is rotating at constant rotational speed. There is a net torque on it. A lever multiplies a force but does not redirect it. On a rotating merry go round one child sits halfway out between the axis and the edge. Another child sits on the edge. Both kids have the same rotational speed. Angular momentum is a vector.

1)True or False: Ambiguity is a type of vagueness True False 2)True or False: When determining...

1)True or False: Ambiguity is a type of vagueness True False 2)True or False: When determining whether a report of an argument should be treated as an argument, it is important to consider the context in which the report is made. True True False 3) True or False: In a V argument with two premises, if one of the premises is false, then the argument is definitely weak True False 4) True or False: A report of an argument can...

1. true or false? carbon dioxide level increases in the atmosphere correlate with increases in other...

1. true or false? carbon dioxide level increases in the atmosphere correlate with increases in other greenhouse gases Select one: True False

Select True or False: The polarity of covalent bonds increases as the percent ionic character increases.

1. (TRUE or FALSE?) Compound interest decreases as the number of years increases. 2. (TRUE or...

1. (TRUE or FALSE?) Compound interest decreases as the number of years increases. 2. (TRUE or FALSE?) The process of converting the initial amount into a future value is called discounting. 3. (TRUE or FALSE?) The future value is simply the current value of a future cash flow that has been discounted at the appropriate discount rate.

Write True or False. If False, rewrite the statement as a true. 9. When a collision...

Write True or False. If False, rewrite the statement as a true. 9. When a collision occurs between two objects, the vector sum of the momenta changes. 10. All collisions conserve momentum and can be distinguished on the basis of whether they also conserve kinetic energy. 11. During a hockey game, a stationary goalie stops a puck. If we know his kinetic energy after the save, we can determine the initial kinetic energy of the puck. 12. When two bodies...

Question