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PCS 211 Final: PCS211 – Pre Test Final Exam (Solution)

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turquoisegnu128
31 Jan 2019
School
Ryerson University
Department
Physics
Course
PCS 211
Professor
All

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Document Summary

P a g e | 1: we know the signs of the components of two vectors, a and b, which have equal magnitudes. The signs are: ax negative; ay positive; bx negative; by negative. Determine the coordinate direction angle of the resultant force. P a g e | 2: determine the height d of cable ab so that the force in cables ad and ac is one-half as great as the force in cable ab. P a g e | 3: a carpenter carries a uniform 6 kg board. The cable cb can sustain a maximum load of 500 n before it breaks. If f1 = 1. 5f2, determine the critical load f2. (a) 300 n (b) 110 n (c) 490 n (d) 250 n (e) 390 n. 300-kg walkway is at g, calculate the tension t in the horizontal cable. (a) 1200 n (b) 230 n (c) 1700 n (d) 2500 n (e) 850 n.

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Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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Related Questions

Particle A of charge 3.00 x 10^-4 C is at the origin, particle B ofcharge -6.00 x 10^-4 C is at (4.00 m, 0) and particle C of charge1.00 x 10^-4C is at (0, 3.00m)
(a) What is th ex-component of the electric force exerted by A onC? (b) What is the y- component of the force exerted by A on C? (c)Find the magnitude of the force exerted by B on C. (d) Calculatethe x-component of the force exerted by B on C. (e) Calculate they-component of the force exerted by B on C. (f) Sum the two x-components to obtain the resultant x- component of the electricforce acting on C. (g) Repeat part (f) for the y- component. (h)Find the magnitude and direction of the resultant electric forceacting on C.


An infinite metal slab is located perpendicular to thex-axis, between x = 0 and x = 2.0 cm(see figure). The slab has a surface charge density of +4.8 × 10-6C/m2 on each side.

(a) Find the magnitude of the potentialdifference between x = 0 and x = 8 cm.

|V(8 cm) - V(0)| =V

For parts (b) and (c), take the potential to be 0 at x= 0.

(b) What is the potential at x = 2.0 cm?.

V(2.0 cm) = V *

(c) What is the potential at x = 8 cm?.

V(8 cm) = V

HELP: The slab is made of aconducting material. Also, watch the signs: theelectric field always points in the direction of decreasingpotential.

For parts (d) and (e), take the potential to be 0 at x= -8 cm.

(d) What is the potential at x = 2.0 cm?.

V(2.0 cm) = V

(e) What is the potential at x = 10 cm?.

V(10 cm) = V

HELP: What is the direction of theelectric field to the left and to the right of the slab? How do theelectric field magnitudes in these regions compare?

This problem introduces the concept of tension. The example is a rope, oriented vertically, that is being pulled from both ends. Let Fu and Fd (with u for up and d for down) represent the magnitude of the forces acting on the top and bottom of the rope, respectively. Assume that the rope is massless so that its weight is negligible compared with the tension. (This is not a ridiculous approximation-modern rope material such as Kevlar can carry tensions thousands of times greater than the weight of tens of meters of such rope.)

Consider the three sections of rope labeled a, b, and c in the figure.

  • At point 1, a downward force of magnitude Fad acts on section a.
  • At point 1, an upward force of magnitude Fbu acts on section b.
  • At point 1, the tension in the rope is T1.
  • At point 2, a downward force of magnitude Fbd acts on section b.
  • At point 2, an upward force of magnitude Fcu acts on section c.
  • At point 2, the tension in the rope is T2.

(A) What is the magnitude Fad of the downward force on section a?

(B) What is the magnitude Fbu of the upward force on section b?

(C) The magnitude of the upward force on c, Fcu, and the magnitude of the downward force on b, Fbd, are equal because of which of Newton's laws?

(D) The magnitude of the force Fbu is ______ Fbd.

(E) Now consider the forces on the ends of the rope. What is the relationship between the magnitudes of these two forces?

(a) Fu > Fd

(b) Fu = Fd

(c) Fu < Fd

(F) The ends of a massless rope are attached to two stationary objects (e.g., two trees or two cars) so that the rope makes a straight line. For this situation, which of the following statements are true?

(a) The tension in the rope is everywhere the same.

(b) The magnitudes of the forces exerted on the two objects by the rope are the same.

(c) The forces exerted on the two objects by the rope must be in opposite directions.

(d) The forces exerted on the two objects by the rope must be in the direction of the rope.