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MY NOTES ASK YOUR TEACHER Two forces are applied to a car in an effort to move it, as shown in the figure below. (Let F₁-430 N and F₂ = 365 N. Assume up and to the right are in the positive directions.) F PRACTICE ANOTHER F₁ (a) What is the resultant vector of these two forces? magnitude N direction to the right of the forward direction (b) If the car has a mass of 3,000 kg, what acceleration does it have? Ignore friction. m/s²
5. [-/1 Points] MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Two identical strings making an angle of 0 = 26.3° with respect to the vertical support a block of mass m = 12.7 kg (see the figure below). What is the tension in each of the strings? (Enter your answer in N.) HINT DETAILS SERCP11 4.5.P.032. Need Help? Read it Watch
6. [-/3 Points] DETAILS SERCP11 4.6.OP.039. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The figure below shows a bird feeder that weighs 129.3 N. The feeder is supported by a vertical cable, which is in turn tied to two cables, each of which is attached to a horizontal post. The left cable makes a 60° angle with the post, while the right cable makes a 30° angle. What is the tension in each cable (in N)? left cable right cable. bottom cable 60° Bird food 30° N N
The figure below shows two blocks connected to each other by a light cable that passes over a pulley with negligible friction. The block of mass m₂ = 4.30 kg lies on a horizontal table with negligible friction, while the block of mass m₂ 10.1 kg hangs vertically. (a) What is the magnitude of the acceleration of each block (in m/s2)? (Here, a, is the acceleration of m₂, and a₂ is the acceleration of m₂.) m/s² m/s² (b) What is the tension in the cable (in N)? Need Help? Read it
8. [-/1 Points] DETAILS SERCP11 4.7.P.054. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An Atwood's machine (see the figure below) consists of two masses: one of mass 2.33 kg and the other of mass 6.66 kg. When released from rest, what is the acceleration of the system? (Enter the magnitude in m/s².) HINT m/s2 Need Help? Read it Watch e
A block of mass m₂ = 19.4 kg is on a frictionless table to the left of a second block of mass m₂ = 20.7 kg, attached by a horizontal string (see the figure below). HINT m1 (a) If a horizontal force of 1.33 x 102 N is exerted on the block m₂ in the positive x-direction, use the system approach to find the acceleration (in m/s2) of the two blocks. m/s2 m2 (b) What is the tension (in N) in the string connecting the blocks? Need Help? Read It Watch
10. [-/5 Points] DETAILS SERCP11 4.7.P.056. MY NOTES ASK YOUR TEACHER Two blocks each of mass m are fastened to the top of an elevator as in the figure. The elevator has an upward acceleration a. The strings have negligible mass. (a) Find the tensions 7, and T, in the upper and lower strings in terms of m, a, and g.
(a) Find the tensions T₁ and T₂ in the upper and lower strings in terms of m, a, and g. 7₂" (b) Compare the two tensions and determine which string would break first if a is made sufficiently large. OT, will break first. OT₂ will break first. (c) What are the tensions if the cable supporting the elevator breaks? T₂- Need Help? Read It -
Two blocks of masses m and 2m are held in equilibrium on a frictionless incline as in the figure. In terms of m and 0, find the following. (Use any variable or symbol stated above along with the following as necessary: g.) T₂ (a) the magnitude of the tension 7, in the upper cord T₁ (b) the magnitude of the tension 7₂ in the lower cord connecting the two blocks Need Help? Read it