1. [-/10 Points] DETAILS SERPSE10 5.1.P.002. MY NOTES ASK YOUR TEACHER One or more external forces, large enough to be easily measured, are exerted on each object enclosed in a dashed box shown in the figures below. Identify the reaction to each of these forces. (Select all that apply.) (a) Contact forces a force exerted by spring on hand, to the left force exerted by spring on wall, to the right force exerted by spring on wall, to the left O force exerted by spring on hand, to the right (b) b force exerted by wagon on handle, downward to the left force exerted by wagon on planet, upward force exerted by wagon on handle, upward to the left O force exerted by wagon on planet, downward force exerted by wagon on ground, downward force exerted by wagon on ground, upward (c) C force exerted by football on player, downward to the right force exerted by football on player, downward to the left O force exerted by football on planet, upward O force exerted by football on planet, downward (d) Field forces d O force exerted by small-mass object on large-mass object, to the right force exerted by small-mass object on large-mass object, upward force exerted by small-mass object on large-mass object, to the left (e) e O force exerted by negative charge on positive charge, to the left force exerted by negative charge on positive charge, to the downward force exerted by negative charge on positive charge, to the right (F ) Iron N S2. [-/10 Points] DETAILS SERPSE10 5.4.OP.001.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A toy rocket engine is securely fastened to a large puck that can glide with negligible friction over a horizontal surface, taken as the xy plane. The 4.80-kg puck has a velocity of 1.20i m/s at one instant. Eight seconds later, its velocity is (6.001 + 6.0j) m/s. (a) Assuming the rocket engine exerts a constant horizontal force, find the components of the force. i+ IN (b) Find its magnitude. Need Help? Read it Master It 3. [-/10 Points] DETAILS SERPSE10 5.4.P.003. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A 8.00-kg object undergoes an acceleration given by a = (8.00 i + 1.00 j) m/s2. (a) Find the resultant force acting on the object. i N (b) Find the magnitude of the resultant force. IFI = N Need Help? Read It Watch It 4. [-/10 Points] DETAILS SERPSE10 5.4.OP.005. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A force F applied to an object of mass m, produces an acceleration of 3.40 m/s2. The same force applied to a second object of mass m, produces an acceleration of 1.30 m/s2. (a) What is the value of the ratio m, /m2? (b) If m, and my are combined into one object, find its acceleration under the action of the force F. m/s2 Need Help? Read It Watch It 5. [-/10 Points] DETAILS SERPSE10 5.4.OP.006.MI.SA. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part. Tutorial Exercise Two forces F , and F 2 act on a 7.90-kg object. F, = 22.0 N and F2 = 15.5 N. 90.0 60.0 - F F a b (a) Find the acceleration of the object for the configuration of forces shown in Figure (a). (b) Find the acceleration of the object for the configuration of forces shown in Figure (b). Click here to begin! Need Help? Read It6. [-/10 Points] DETAILS SERPSE10 5.4.P.007. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Three forces acting on an object are given by F, = (-1.8i + 6.30j) N. F2 = (5.101 - 1.55j) N, and F3 = (-41.51) N. The object experiences an acceleration of magnitude 3.80 m/s2. (a) What is the direction of the acceleration? (counterclockwise from the +x-axis) (b) What is the mass of the object? kg (c) If the object is initially at rest, what is its speed after 20.0 s? m/s (d) What are the velocity components of the object after 20.0 s? (Let the velocity be denoted by v.) V = i+ j) m/s Need Help? Read it Watch It 7. [-/10 Points] DETAILS SERPSE10 5.5.P.011.MI.SA. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part. Tutorial Exercise An electron of mass 9.11 x 10 31 kg has an initial speed of 2.30 x 105 m/s. It travels in a straight line, and its speed increases to 6.50 x 105 m/s in a distance of 4.30 cm. Assume its acceleration is constant. (a) Determine the magnitude of the force exerted on the electron. (b) Compare this force with the weight of the electron, which we ignored. Click here to begin! Need Help? Read It 8. [-/10 Points] DETAILS SERPSE10 5.7.OP.014. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The systems shown below are in equilibrium with m = 5.30 kg and 0 = 33.0. If the spring scales are calibrated in newtons, what do they read? Ignore the masses of the pulleys and strings and assume the pulleys and the incline are frictionless. m m m b mm C d scale in (a): scale in (b): scale in (c): scale in (d): Need Help? Read It Watch It3:45 9. [-/10 Points] DETAILS SERPSE10 5.7.OP.016. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A 3.20-kg object is moving in a plane, with its x and y coordinates given by x = 82 - 2 and y = 43 + 1, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting on this object at t = 2.20 s. Need Help? Read It Watch ! 10. [-/10 Points] DETAILS SERPSE10 5.7.P.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A block slides down a frictionless plane having an inclination of 8 = 13.69. The block starts from rest at the top, and the length of the incline is 2.50 m. (a) Draw a free-body diagram of the block. This answer has not been graded yet. (b) Find the acceleration of the block. m/s down the incline (c) Find its speed when it reaches the bottom of the incline. m/s Need Help? Read It Watch 11. [-/10 Points] DETAILS SERPSE10 5.7.OP.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A bag of cement weighing 300 N hangs in equilibrium from three wires as suggested in the figure below. Two of the wires make angles 0, = 55.0 and 82 = 39.0 with the horizontal. Assuming the system is in equilibrium, find the tensions 7, T2, and 73 in the wires. T2 Z De T CEMENT Need Help? Read It Watch It 12. [-/10 Points] DETAILS SERPSE10 5.7.P.022. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An object of mass m, = 3.50 kg placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fastened to a hanging object of mass my = 6.70 kg as shown in the figure. (a) Draw free-body diagrams of both objects. 312 44 440 49 88 This answer has not been graded yet. webassign.net12. [-/10 Points] DETAILS SERPSE10 5.7.P.022. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An object of mass m, = 3.50 kg placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fastened to a hanging object of mass m, = 6.70 kg as shown in the figure. (a) Draw free-body diagrams of both objects. This answer has not been graded yet. (b) Find the magnitude of the acceleration of the objects. m/s2 (c) Find the tension in the string. N Need Help? Read It Watch It 13. [-/10 Points] DETAILS SERPSE10 5.7.P.023.MI.SA. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part. Tutorial Exercise In the system shown in the figure below, a horizontal force Fx acts on an object of mass my = 6.35 kg. The horizontal surface is frictionless. Consider the acceleration of the sliding object as a function of Fx- (a) For what values of Fx does the object of mass m, = 1.45 kg accelerate upward? (b) For what values of Fx is the tension in the cord zero? (c) Plot the acceleration of the my object versus Fx. Include values of Fx from -100 N to +100 N. Click here to begin! Need Help? Read It 14. [-/10 Points] DETAILS SERPSE10 5.7.OP.026. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider the Atwood machine shown in the figure, where m, = 2.00 kg and my = 7.25 kg. The system starts at rest, then the sphere is given a quick push downward, giving it an initial speed of 2.80 m/s.14. [-/10 Points] DETAILS SERPSE10 5.7.OP.026. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider the Atwood machine shown in the figure, where m, = 2.00 kg and my = 7.25 kg. The system starts at rest, then the sphere is given a quick push downward, giving it an initial speed of 2.80 m/s. Assume the pulley and cord are massless, and the cord is inextensible. Neglect friction. (a) Through what distance (in m) will m, descend? m (b) What is the velocity (in m/s) of m, after 1.80 s? magnitude m/s direction ---Select- Need Help? Read it 15. [-/10 Points] DETAILS SERPSE10 5.7.OP.027.MI.SA. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part. Tutorial Exercise Consider a 77.5-kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.71 m/s in 0.825 s. It travels with this constant speed for the next 5.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 1.75 s and comes to rest. (a) What does the spring scale register before the elevator starts to move? (b) What does the spring scale register during the first 0.825 s? (c) What does the spring scale register while the elevator is traveling at constant speed? (d) What does the spring scale register during the time it is slowing down? Click here to begin! Need Help? Read It 16. [-/10 Points] DETAILS SERPSE10 5.8.P.029. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A 9.30-kg hanging object is connected by a light, inextensible cord over a light, frictionless pulley to a 5.00-kg block that is sliding on a flat table. Taking the coefficient of kinetic friction as 0.246, find the tension in the string. (The block slides to the right in the diagram below.) Need Help? Read It Watch It