figure below, the table surface is NOT frictionless and the system is at rest. The mass of block A is ma and the mass of block B is mg. Which of the ring is true?
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- (a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee? (b) During strenuous exercise, it is possible to exert forces to the joints that are easily 10 times greater than the weight being supported. What is the maximum force of friction under such conditions? The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pam.10.3 K/s ll. docs.google.com/forms O Mass MA = 8 kg rests on top of mass MB = 4 kg that rests on a bläi 6 frictionless table. The coefficient of friction between the two blocks is such that the blocks just start to slip when the horizontal force Fapplied to the lower block is 27 N. Suppose that now a horizontal force is applied to the upper block. What is its maximum value for the blocks to slide without slipping ?relative to each other S kg 4 kg F N 54 0.3 0.2 ='F =f 21 ...In the figure below, the table surface is NOT frictionless and the system is at rest. The mass of block A is mA and the mass of block B is mg. Which of the following is true? A B The force of static friction on block A is greater than the weight of block B. The force of static friction on block A is less than the weight of block B. The force of static friction on block A is equal to the weight of block A. The force of static friction on block A is equal to the weight of block B.
- Problem: A S0-kg box slides down an inclined plane made up of varlous materials. The plane is inclined 20 degrees from the horizontal, the materials and their respective coefficient of friction and distances is already given on the figure. I there is no external force applied on the box, and if the inilial velocity is at 100m/s. determine the following: A) What would be the velocily of the box after siding down along the Ice? Initial velocity, v 50 kd B) Frictional Force exerted when the box is on Concrete. C) Deceleration on the box when on concrete. DJ How for would the box slide down before it fuly stops. assuming that the rest of the incline is made up of wood? ICE. =0.15 CONCRETE. = 0.7 100 m 150 m WOOD, U0.35 E) Total Work done by the box.In the figure, a horizontal force of 100 N is to be applied to a 10 kg slab that is initially stationary on a frictionless floor, to accelerate the slab. Block Slab 100 N A 10 kg block lies on top of the slab; the coefficient of friction u between the block and the slab is not known, and the block might slip. Considering that possibility, what is the possible range of values for the magnitude of the slab's acceleration aslab? (Hint: You don't need written calculations; just consider extreme values for u .) Block Slab 100 N Number Units to Number Units What is the possible range for the magnitude ablock of the block's acceleration? Block Slab 100 N Number Units Number UnitsA block of mass m is being pulled by the string as shown below. The string has a tension T and makes an angle with the horizontal. If the block is initially at rest, find an expression for the velocity of the block after is has been moved a distance d. Your expression should only contain terms such as the tension, the coefficient of kinetic friction, the angle, d, etc. m T 0 Hk
- You push a 5.0-kg block up a ramp by exerting a 100-N force directed parallel to the ramp, which is at a 30∘ angle to the horizontal. Part A Ignoring any effects due to friction, calculate the block's speed when you have pushed it 3.0 m if its velocity when you began pushing was 2.0 m/s up the slope. Express your answer with the appropriate units. Part B Now consider friction. If the coefficient of kinetic friction between block and ramp is μ = 0.25, what is the block's speed after you have pushed it 3.0 m ? Express your answer with the appropriate units Part C With this value of μk how much farther up the ramp does the block move once you stop pushing? Express your answer with the appropriate units.A safety mechanism of a lift is simplified by the figure below. A 300 kg block is to slide over an inclined surface. The coefficient of friction between the block rollers and the inclined surface is p=0.3. If the system is in equilibrium, work out the following: (a) Free body diagram of the complete system. (b) Find the normal force N on the block and the maximum friction force Fmax. (c) Find the mass of the lift m, required to satisfy the equilibrium and prevents the block moving downward, (d) Find tension force in the cable (e) If the mass of the lift is 150 kg, p=0.3, and surface angle is increased to 30° will the block move upward? Explain the answer. 300 kg block 20° Cable Lift moH Review I Constants An air-conditioning unit is fastened to a roof that slopes at an angle of 0 = 33° above the horizontal (Figure 1). Its weight is a force F on the air conditioner that is directed vertically downward. In order that the unit not crush the roof tiles, the component of the unit's weight perpendicular to the roof cannot exceed 425 N. (One newton, or 1 N, is the Sl unit of force. It is equal to 0.2248 lb.) (a) What is the maximum allowed weight of the unit? (b) If the fasteners fail, the unit slides L = 1.60 m along the roof before it comes to a halt against a ledge. How much work does the weight force do on the unit during its slide if the unit has the weight Use the relationship between the magnitude and direction of a vector and its components to solve for the target variable in question (a). Express your answer with the appropriate units. > View Available Hint(s) ? F = Value Units calculated in part (a)? The work done by a force F on an object that undergoes a…
- Consider the cart on a track below. A pulling force is shown acting to the right. Assume that there is no resistance to motion from the surface (no friction) can be ignored. 0.5N 1kg If the mass of the cart is increased to 2 kg what effect will it have on the acceleration? O The acceleration remains the same in the new scenario as the original. O The acceleration will be greater in the new scenario than the original. O It's not possible to tell from the information provided. O The acceleration will be less in the new scenario than the original.OC During the collision, the magnitude of the force ol OD.During the collision, the magnitude of the force on the truck is greater then the magnitude c QUESTION 15 If the velocity of an object is zero at some point, then its acceleration must also be zero at that point. O True O False QUESTION 16 Suppose that an object travels from one point in space to another. Make a comparison between t OA. The magnitude of the displacement can be either greater than, smaller than, or equal to th O B. The magnitude of the displacement is either less than or equal to the distance traveled OC The magnitude of the displacement is always equal to the distance traveled. O D. The magnitude of the displacement is either greater than or equal to the distance traveled. Save and Submit to save and suhmit Cliulents Once I went skiing. I was at the bottom of a snow ramp with a speed of 14.0 m/s. Assuming that the coefficient of friction between the snow and the skis was 0.2 determine my speed at the top of the ramp. The angle theta with the horizontal was 25°. The rise of the snow ramp was h=3.5 meters high. h Skier Met < Previous OL 1