What is the direction of the force that ALWAYS acts on clothes during the spin cycle of a washing machine? Explain. (a) Up (b) Down (c) Right (d) Outward (e) Left

A 33.2 kg boy and a 22.0 kg girl are standing at the edge of a 161 kg merry-go-round of radius 1.41 m that is currently rotating at 32.0 rpm. The two kids then walk inward toward the center of the merry-go-round; while the boy reaches the center, the girl stops halfway. Given their new positions, what is the new rate of rotation of the merry-go-round (in rpm)? For simplicity's sake, you may treat the kids as point masses and the merry-go-round as a flat disk. Hint: Figure 10.12 in the textbook provides a good refresher on the various moments of inertia!

Anemometers are used to measure wind speeds. Wind striking the cups causes the assembly to rotate; a gauge measures the frequency of this rotation and translates the data into wind speed. The length of each arm, as measured Bulb from cup to cup, is 46.5 cm. The friction in the bearings is negligible, so the tangential speed of the cups matches the wind speed fairly closely. Coil Your company makes anemometers and plans to install light bulbs on them for high-wind warnings. The idea is to attach a coil of wire of radius 13.2 cm to one of the arms and use the EMF induced by the magnetic field of the Earth to light the bulb. The bulbs possess 234 2 of internal resistance but need 12.5 W of rms power dissipation to be visible at night. (The resistance of the wire is negligible.) wind Although company management wants this new feature, you have doubts about its practicality. Assuming the magnetic field of the Earth is 0.500 G and is oriented roughly horizontal with the Earth's surface, and…

Replace the force system by a resultant force and couple moment at point O. 500 N 3 750 N 200 N 1m 200 N 1.25 m 1.25 m

The vertical and horizontal poles at the traffic-light assembly are erected first. Determine the additional force and moment reactions at the base O caused by the addition of the three 120-lb traffic signals B, C, and D. Report your answers as a force magnitude and a moment magnitude. 27" 38' 27' 120 lb 120 Ib 120 lb Answers: O = i Ib Mo = i Ib-ft

A can of juice rolls down a ramp with angle 65 degrees.  If the slope were frictionless the can would slide down the incline without rolling.  Calculate the minimum coefficient of static friction needed for the can to roll down the incline.  Model the can as a cylinder of mass 1100 g, radius 20 cm and length 22 cm. Hint:  Use Newton's Second Law

4. The diagram shows a wheel rolling without slipping along a horizontal road, from left to right. A piece of mud on the rim becomes detached at M when the contact between wheel and road is at P. Which of the arrows, A, B, C, D, E best shows the initial direction of the path followed by the detached particle ? C Arrow C A Arrow A B Arrow B D Arrow D E Arrow E C В M.

Why is the following situation impossible? A space station shaped like a giant wheel (Fig. P11.28, page 306) has a radius of r = 100 m and a moment of inertia of 5.00 108 kg m2. A crew of 150 people of average mass 65.0 kg is living on the rim, and the stations rotation causes the crew to experience an apparent free-fall acceleration of g. A research technician is assigned to perform an experiment in which a ball is dropped at the rim of the station every 15 minutes and the time interval for the ball to drop a given distance is measured as a lest to make sure the apparent value of g is correctly maintained. One evening, 100 average people move to the center of the station for a union meeting. The research technician, who has already been performing his experiment for an hour before the meeting, is disappointed that he cannot attend the meeting, and his mood sours even further by his boring experiment in which every time interval for the dropped ball is identical for the entire evening. Figure P11.28

An elevator system in a tall building consists of a 800-kg car and a 950-kg counterweight joined by a light cable of constant length that passers over a pulley of mass 280 kg. The pulley, called a sheave, is a solid cylinder of radius 0.700 m turning on a horizontal axle. The cable does not slip on the sheave. A number n of people, each of mass 80.0 kg, are riding in the elevator car, moving upward at 3.00 m/s and approaching the floor where the car should stop. As an energy-conservation measure, a computer disconnects the elevator motor at just the right moment so that t he sheavecarcounterweight system then coasts freely without friction and comes to rest at the floor desired. There it is caught by a simple latch rather than by a massive brake. (a) Determine the distance d the car coasts upward as a function of n. Evaluate the distance for (b) n = 2, (c) n = 12, and (d) n = 0. (e) For what integer values of n does the expression in part (a) apply? (f) Explain your answer to part (e). (g) If an infinite number of people could fit on the elevator, what is the value of d?

A cyclist rides a bicycle with a wheel radius of 0.500 m across campus. A piece of plastic on the front rim makes a clicking sound every time it passes through the fork. If the cyclist counts 320 clicks between her apartment and the cafeteria, how far has she traveled? (a) 0.50 km (b) 0.80 km (c) 1.0 km (d) 1.5 km (e) 1.8 km