The 2.0 kg, 30-cm-diameter disk in Figure P12.66 is spinning at 300 rpm. How much friction force
Question:
The 2.0 kg, 30-cm-diameter disk in Figure P12.66 is spinning at 300 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 3.0 s?
Brake FIGURE P12.66
Step by Step Answer:
Model The disk is a rigid spinning body Visualize The initial angular velocity ...View the full answer
Physics for Scientists and Engineers A Strategic Approach with Modern Physics
ISBN: 978-0133942651
4th edition
Authors: Randall D. Knight
Related Video
Static friction and kinetic friction are two types of friction that occur when two objects are in contact with each other. Static friction is the force that must be overcome to initiate motion between two surfaces that are in contact with each other but are not moving relative to each other. It is caused by the interlocking of rough surfaces at the microscopic level, and it increases as the force pushing the surfaces together increases. Once motion between the surfaces starts, the static friction is no longer present. Kinetic friction, also known as sliding friction, is the force that opposes the motion of two surfaces that are in contact with each other and are moving relative to each other. It is caused by the rubbing of the surfaces against each other and the resistance of the molecules in the surfaces to being moved. Kinetic friction is generally less than static friction, but it can still be a significant force, especially at high speeds. Both static and kinetic friction can be quantified using a coefficient of friction, which is a dimensionless number that represents the ratio of the frictional force between two surfaces to the normal force (the force perpendicular to the surfaces). The coefficient of static friction is typically greater than the coefficient of kinetic friction for a given pair of surfaces, because it takes more force to overcome the interlocking of the surfaces at rest than to maintain motion once it has started.
Students also viewed these Physics questions
-
The 5.0 kg, 60-cm-diameter disk in FIGURE P12.72 rotates on an axle passing through one edge. The axle is parallel to the floor. The cylinder is held with the center of mass at the same height as the...
-
The 20-cm-diameter disk in Figure EX12.20 can rotate on an axle through its center. What is the net torque about the axle? y 30 N, 30 N 45 5.0 5.0 c cm 20 N 20 N FIGURE EX12.20
-
What is the angular momentum vector of the 2.0 kg, 4.0-cm-diameter rotating disk in FIGURE EX12.43? y 600 rpm FIGURE EX12.43
-
Cliff Arthur has equally attractive job offers in Miami and Los Angeles. The rent ratios in the cities are 8 and 20, respectively. Cliff would really like to buy rather than rent a home after he...
-
In 2013, Maxwell Inc. paid $625,000 for equipment that is expected to have a five-year life. In this industry, the residual value is estimated to be 5 percent of the asset's cost. Maxwell Inc. plans...
-
Keith Shoe Stores carries a basic black dress shoe for men that sells at an approximate constant rate of 500 pairs of shoes every three months. Keiths current buying policy is to order 500 pairs each...
-
What does a report on personal financial statements typicallv address?
-
Product mix, relevant costs (N. Melumad, adapted) Pendleton Engineering makes cutting tools for metalworking operations. It makes two types of tools: R3, a regular cutting tool, and HP6, a...
-
In the figure, two blocks are connected over a pulley. The mass of block A is 5.10 kg and the coefficient of kinetic friction between A and the incline is 0.220. Angle 0 of the incline is 45.0. Block...
-
The simple beam AB is subjected to a uniform distribution load as shown in the figure. Draw a shear force plot and find the position and value at which the shear force magnitude is maximized. A W L B
-
Blocks of mass m 1 and m 2 are connected by a massless string that passes over the pulley in Figure P12.65. The pulley turns on frictionless bearings. Mass m 1 slides on a horizontal, frictionless...
-
A 30-cm-diameter, 1.2 kg solid turntable rotates on a 1.2-cm diameter, 450 g shaft at a constant 33 rpm. When you hit the stop switch, a brake pad presses against the shaft and brings the turntable...
-
1. Which of the following statements concerning bonds is incorrect? a. They involve blended payments of principal and interest. b. They have a fixed maturity date, at which time the issuer repays the...
-
The airline industry made $36 billion in profits in 2015, up from nearly $12 billion in 2013. But in 2008, during the recession, the industry was teetering on the edge of disaster. According to the...
-
The federal Energy Information Administration estimates that nearly 95% of all new power capacity installed in the United States in 2017 came from renewables. These are natural resources that are not...
-
The market for toys during the holiday season is intensely competitive. Before the 2018 holiday season, Toys R Us and the Bon-Ton department store chain had closed, and Sears had closed many of its...
-
Boeing is back at the drawing board. In 2015, after releasing the Boeing 777X, an update to the widely popular 777, they announced plans to redevelop their production process. Boeing hoped to extend...
-
During the year ended 30 June 2019, the directors of Jindabyne Ltd declared and paid an interim dividend of $18 000 out of retained earnings. At the end of the year the financial statements showed a...
-
Estimate the energy of a Boeing 747 (mass M=400 t) at cruising speed (850 km h -1 ) and compare it with the energy released in a mosquitoantimosquito annihilation.
-
Find the cross product a x b and verify that it is orthogonal to both a and b. a = (t, 1, 1/t), b = (t 2 , t 2 , 1)
-
Find the gravitational force that the earth exerts on a 10.0-kg mass if it is placed at the following locations. Consult Fig. 13.9, and assume a constant density through each of the interior regions...
-
A spacecraft is to be launched from the surface of the earth so that it will escape from the solar system altogether. (a) Find the speed relative to the center of the earth with which the spacecraft...
-
The 0.100-kg sphere in Fig. P13.62 is released from rest at the position shown in the sketch, with its center 0.400 m from the center of the 5.00-kg mass. Assume that the only forces on the 0.100-kg...
-
Use the given information below to evaluate each definite integral. 10 [ f(x) dx = 3 and f(x) dx = 9 a. f(x) dx = b. *8f(x) dx = C. L f(x) dx = = 10 10 f(x) dx + 6 f(x) dx = d. f* 10 e. f(x) dx =
-
what other supply chain concepts, tools, techniques, etc. would you recommend (other than CPFR) that West Marine should pursue after it purchases Boat U.S.? (Be specific, give examples, and reference...
-
3. Dollar General has a sale on a 12 pack of 12 ounce cans of Pepsi. Buy three for $11 and get a digital coupon for $2 off. It is also offering a sale on a 6 pack of 16.9 ounce bottles. Get four 6...
Study smarter with the SolutionInn App