A student presses a book between his hands, as the drawing indicates. The forces that he...
A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendicular to the book and are horizontal. The book weighs 32.5 N. The coefficient of static friction between his hands and the book is 0.394. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?
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A student presses a book between his hands, as the drawing
indicates. The forces that he...
A student presses a book between his hands, as the drawing indicates. The forces that he...
A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendicular to the book and are horizontal. The book weighs 32.7 N. The coefficient of static friction between his hands and the book is 0.381. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?
QUESTION 3 A student presses a book between his hands, as the drawing indicates. The forces...
QUESTION 3 A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendicular to the book and are horizontal. The book's mass is 1.5 kg Calculate the wight of the book in N with 3 significant figures. (Assume acceleration due to gravity g 9.80 m/s, down) QUESTION 4 A student presses a book between his hands, as the drawing indicates. The forces that...
QUESTION 9 To maintain a constant speed, the force provided by a car's engine must equal...
QUESTION 9 To maintain a constant speed, the force provided by a car's engine must equal the drag force plus the force of friction of the road (the rolling resistance). What is the drag force at 57.2 MPH for a Hummer H27 (Drag area for Hummer is 2.44 m2 and look up Table 5.2, chap-5 for the drag coefficient) Express your answer in N with 3 significant figures. QUESTION 10 Calculate the terminal velocity a spherical rain drop, diameter 4.06...
6. A 90 kg gymnast wedges himself between two closely spaced vertical walls by pressing his...
6. A 90 kg gymnast wedges himself between two closely spaced vertical walls by pressing his hands and feet against the walls. What is the minimum force the gymnast must push with each hand and foot if the coefficient of kinetic friction is 0.64 and the coefficient of static friction is 0.78? Assume the force on each hand and foot are all equal.
A 60 kg rock climber has positioned himself as shown in the figure (with his hands...
A 60 kg rock climber has positioned himself as shown in the figure (with his hands on one side of a gap and his feet on the other side). Both friction and normal forces act on his hands and feet. The width of the gap, w, is 0.24 m and the climber's center of mass is a horizontal distance d 0.54 m from the gap. The coefficient of static friction = 0.48 between his hands and the rock and 2...
A 74 kg rock climber has positioned himself as shown in the figure (with his hands...
A 74 kg rock climber has positioned himself as shown in the figure (with his hands on one side of a gap and his feet on the other side). Both friction and normal forces act on his hands and feet. The width of the gap, w, is 0.28 m and the climber's center of mass is a horizontal distance d = 0.44 m from the gap. The coefficient of static friction Hi = 0.46 between his hands and the rock...
The drawing shows a circus clown who weighs 890 N. The coefficient of static friction between...
The drawing shows a circus clown who weighs 890 N. The coefficient of static friction between the clown’s feet and the ground is 0.590. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the minimum pulling force that the clown must exert to yank his feet out from under himself?
5) (10 pts) John is baby-sitting Casey, his 3-year old brother. He puts a crash helmet...
5) (10 pts) John is baby-sitting Casey, his 3-year old brother. He puts a crash helmet on Casey, places him in the red wagon and takes him on a stroll through the neighborhood. As John starts across the street, he exerts a 58 N forward force on the wagon. There is a 20 N resistance force (friction) and the wagon and Casey have a combined weight of 302 N. Construct a free body diagram showing all the forces acting upon...
QUESTION 3 A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendicular to the book and are horizontal. The book's mass is 1.5 kg Calculate the wight of the book in N with 3 significant figures. (Assume acceleration due to gravity g 9.80 m/s, down) QUESTION 4 A student presses a book between his hands, as the drawing indicates. The forces that...
QUESTION 9 To maintain a constant speed, the force provided by a car's engine must equal the drag force plus the force of friction of the road (the rolling resistance). What is the drag force at 57.2 MPH for a Hummer H27 (Drag area for Hummer is 2.44 m2 and look up Table 5.2, chap-5 for the drag coefficient) Express your answer in N with 3 significant figures. QUESTION 10 Calculate the terminal velocity a spherical rain drop, diameter 4.06...
A 60 kg rock climber has positioned himself as shown in the figure (with his hands on one side of a gap and his feet on the other side). Both friction and normal forces act on his hands and feet. The width of the gap, w, is 0.24 m and the climber's center of mass is a horizontal distance d 0.54 m from the gap. The coefficient of static friction = 0.48 between his hands and the rock and 2...
A 74 kg rock climber has positioned himself as shown in the figure (with his hands on one side of a gap and his feet on the other side). Both friction and normal forces act on his hands and feet. The width of the gap, w, is 0.28 m and the climber's center of mass is a horizontal distance d = 0.44 m from the gap. The coefficient of static friction Hi = 0.46 between his hands and the rock...
5) (10 pts) John is baby-sitting Casey, his 3-year old brother. He puts a crash helmet on Casey, places him in the red wagon and takes him on a stroll through the neighborhood. As John starts across the street, he exerts a 58 N forward force on the wagon. There is a 20 N resistance force (friction) and the wagon and Casey have a combined weight of 302 N. Construct a free body diagram showing all the forces acting upon...
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