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64. A force of 300 Nis suflicient to keep a 100-kg wooden crate moving at comtant velocity acnos awooden foor. What is the coeflicient of kinetic friction?

64. A force of 300 Nis suflicient to keep a 100-kg wooden crate moving at comtant velocity acnos awooden foor. What is the coeflicient of kinetic friction?

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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6.4. A force of 300 N is sufficient to keep a 100-kg wooden crate moving at constant velocity across a wooden floor. What

is the coefficient of kinetic friction?

Supplementary Problems 6.1. Ships are often built on ways that slope down to a nearby body of water. Often a ship is launched before most of its interior and superstructure have been installed, and is completed when afloat. Is this done because the added weight would caise the ship to slide down the ways prematurely? 6.2 A box is being pushed across a flor. Can the frictional force on the bos ever exceed its own weight? Can the frictional force ever exceed the applied force? 61. An 80-lb wooden crate rests on a horizontal wooden Boor. If the coefficient of static friction is 0.5, how mach force is needed to set the crate in motion? 64. A force of 300 Nis suflicient to keep a 100-kg wooden crate moving at constant velocity across a wooden floor. What is the coefficient of kinetie friction? 6.5. A force of 1000Nis applied to a 12001-kg car. If the coetficient of rolling friction is a04, what is the car's acceleration 6.6. The coefficients of static and kinetic friction for stone on wood are, respectively, 0.5 and 0.4. If a 150-kg stone statue is pushed with just enough force to starn it moving across a wooden floor and the same force continues to act afterward, find the statue's acceleration. 6.7. A car whose brakes are locked skids to a stop 70 m from an initial velocity of 80 km/h. Find the coellicient of kinetic friction. 68. A driver sees a horse on the mad and applies the hrakes so hard that they lock and the car skids to a stop in 24 m. The road is level, and the coefficient of kinetic friction between tires and road is 0.7. How fast was the car going when the brakes were applied? 6.9. A truck moving at 100 kmvh carries a steel girder that rests on its wooken floor. What is the minimum time in which the truck can come to a stop without the girder moving forward? The coefficiest of statie frietion hetween steel and wond is 05. CamScanner - iga is guial CHAP 61 FRICTION 73 6.10. A car with its brakes locked will remain stationary on an inclined plane of dry concrete when the plane is it an angle of less than 45 with the horizontal. What is the coefficient of static friction of rubber tires on dry concrete? 6.11. A steel ramp is to be built for sliding blocks of ice from a refrigeration plant down to ground level. If a- 0.05, find the angle with the horizontal at which the ice will slide at constant velocity. 6.12 A hox slides down a plane 8 m long that is inclined at an amgle of 30 with the horizontal. If the box starts from rest and = 0.25, find (a) the acceleration of the bon, (b) its velocity at the hottom of the plane, and (e) the time required for it to reach the bottiom. 613. If the box of Prob. 6.10 has a mass of 60 kg, how mach force is needed to move it up the plane (a) at constant vekocity and (b) with an acceleration of 2 mis? 6.14. A skier stands on a 5 slope. If the coefficient of static friction is 0.1, does the skier start to slide down?
Transcribed Image Text:Supplementary Problems 6.1. Ships are often built on ways that slope down to a nearby body of water. Often a ship is launched before most of its interior and superstructure have been installed, and is completed when afloat. Is this done because the added weight would caise the ship to slide down the ways prematurely? 6.2 A box is being pushed across a flor. Can the frictional force on the bos ever exceed its own weight? Can the frictional force ever exceed the applied force? 61. An 80-lb wooden crate rests on a horizontal wooden Boor. If the coefficient of static friction is 0.5, how mach force is needed to set the crate in motion? 64. A force of 300 Nis suflicient to keep a 100-kg wooden crate moving at constant velocity across a wooden floor. What is the coefficient of kinetie friction? 6.5. A force of 1000Nis applied to a 12001-kg car. If the coetficient of rolling friction is a04, what is the car's acceleration 6.6. The coefficients of static and kinetic friction for stone on wood are, respectively, 0.5 and 0.4. If a 150-kg stone statue is pushed with just enough force to starn it moving across a wooden floor and the same force continues to act afterward, find the statue's acceleration. 6.7. A car whose brakes are locked skids to a stop 70 m from an initial velocity of 80 km/h. Find the coellicient of kinetic friction. 68. A driver sees a horse on the mad and applies the hrakes so hard that they lock and the car skids to a stop in 24 m. The road is level, and the coefficient of kinetic friction between tires and road is 0.7. How fast was the car going when the brakes were applied? 6.9. A truck moving at 100 kmvh carries a steel girder that rests on its wooken floor. What is the minimum time in which the truck can come to a stop without the girder moving forward? The coefficiest of statie frietion hetween steel and wond is 05. CamScanner - iga is guial CHAP 61 FRICTION 73 6.10. A car with its brakes locked will remain stationary on an inclined plane of dry concrete when the plane is it an angle of less than 45 with the horizontal. What is the coefficient of static friction of rubber tires on dry concrete? 6.11. A steel ramp is to be built for sliding blocks of ice from a refrigeration plant down to ground level. If a- 0.05, find the angle with the horizontal at which the ice will slide at constant velocity. 6.12 A hox slides down a plane 8 m long that is inclined at an amgle of 30 with the horizontal. If the box starts from rest and = 0.25, find (a) the acceleration of the bon, (b) its velocity at the hottom of the plane, and (e) the time required for it to reach the bottiom. 613. If the box of Prob. 6.10 has a mass of 60 kg, how mach force is needed to move it up the plane (a) at constant vekocity and (b) with an acceleration of 2 mis? 6.14. A skier stands on a 5 slope. If the coefficient of static friction is 0.1, does the skier start to slide down?
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