On a table, a book is resting. It weighs 8 kilograms. With a force of 15N, you push directly down, however the book stays at rest. Find the book's normal force.
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- The vertical component of the acceleration of a sailplane is zero when the air pushes up against its wings with a lift force of 4.00 kN. a. Assume that the only forces on the sailplane are that due to gravity and that due to the air pushing up against its wings. What will be the gravitational force on Earth due to the sailplane? If the force acting is in upward direction, enter a positive value and if the force acting is in downward direction, enter a negative value. (answer in kN) b. If the wing stalls and the upward force decreases to 1.71 kN, what is the acceleration of the sailplane? If the acceleration is upward, enter a positive value and if the acceleration is downward, enter a negative value answer in m/s^2A woman who weighs 602 N sits on a chair with her feet on the floor and her arms resting on the chair’s armrests. The chair weighs 100 N. Each armrest exerts an upward force of 25.0 N on her arms. The seat of the chair exerts an upward force of 500 N. a. What force does the floor exert on her feet? Enter your answer as positive for upward direction and negative for downward direction. asnwer in N b. What force does the floor exert on the chair? Enter your answer as positive for upward direction and negative for downward direction. answer in N c. Consider the woman and the chair to be a single system. Let the subscripts be the following: s = woman and chair system, e = Earth, f = floor. Choose the correct FBD for this system that includes only the external forces acting on it. (OPTIONS ATTACHED)April works at the grocery store. She needs to move a heavy crate of bananas ( m = 80 kg) to the produce section. She uses a rope to drag the crate at an angle of 20° above the horizontal with a force of 350 N. a. If there is no friction, what is the acceleration of the bananas? b. If the coefficient of kinetic friction between the crate and the floor is 0.2, what is the acceleration of the crate?
- A girl exerts a 140 N of force in pulling a 30 kg box upward on an inclined plane. If the box accelerates at a rate of 0.297 m/s2 and the coefficient of kinetic friction is 0.11, (a) What is the angle of the inclination of the plane? b. If a boy helps the girl in moving the box and he exerts a 150 N of pushing force, determine the new acceleration of the box. c. What is the change in acceleration of the box? SOLVE COMPLETELY AND SHOW A FIGURE AND FREE BODY DIAGRAM THANK YOUDesign a vehicle that can go an initial speed of 20.5 m/s to zero in a distance 84 m. Assume a constant acceleration. What is the smallest coefficient of friction between the tires and road that will allow for these parameters? Ignore air drag, friction can be static or kinetic depending on the situation. Give answer to at least three digits. D. FocusTwo boxes, A and B, are connected by a lightweight cord and are resting on a smooth (frictionless) table. The boxes have masses of 12 kg and 10kg. A horizontal force FP of 40.0 N is applied to the 10 kg box. A. The two boxes are connected, and if the cord remains taut, then the two boxes will have the same acceleration. Solve for acceleration of each box. B. Find the tension in the cord connecting the boxes.
- A lamp hangs vertically from a cord in a descending elevator. The elevator has a deceleration of 2.4 m/ s2 before coming to a stop. A. If the tension in the cord is 89 N, what is the mass of the lamp? B. What is the tension in the cord when the elevator ascends with an upward acceleration of 2.4 m/ s2 ?Tim got a huge birthday gift from his grandmother. A 400. N crate has been delivered to his driveway. In order to get it started moving toward his door, he has to push it with a horizontal force of 250 N, but as soon as it is moving, he can keep it moving at a constant speed by pushing with a 120 N force. What are the coefficients of static and kinetic friction of Tim's birthday gift and the driveway?Ex. M₁ no friction ideal Pulley a) Find tension in each string. Please help me solve problems A and B. Thank you! b) Find acceleration of each mass. M₂ Figure 2: Two masses connected by a string Assume the string and pulley has negligible mass. There is no friction in the system.
- A contestant in a winter sporting event pushes a 45 kg block of ice in the positive direction across a frozen lake as shown in the figure. Assume the coefficients of static and kinetic friction are μs=0.1 and μk=0.03. a. Calculate the minimum force F he must exert to get the block sliding across the ice in newtons. b. What is its acceleration once it starts to move, if that force is maintained in m/s2?You are trying to slide a heavy trunk across a horizontal floor. The mass of the trunk is 85 kg, and you need to exert a force of 3.3 x 102 N parallel to the ground to make it just begin to move. a). Determine the coefficient of static friction between the floor and the trunk. After the trunk starts moving, you continue to push with this force. The trunk reaches a speed of 2.0 m/s after 5.0 s. Calculate the coefficient of kinetic friction.A В