Asked by bhdrkn 5 years ago

**Chap. 9, #12.** (II) Find the tension in the two wires supporting the traffic light shown in Fig. 946.

(Picture) Traffic light hanging from two strings

(String on the left angle is 53 degrees and the string on the right is 37 degrees)

The traffic light weights 33kg.

**Chap. 9, #13.** (II) How close to the edge of the 20.0-kg table shown in Fig. 947 can a 66.0-kg person sit without tipping it over?

Table top surface is 2.20 long and 0.80 from top surface to the ground. The table two legs (center of table) are 1.20m apart from each other. The second leg from the edge of the right side of the table is 0.50m.

**Chap. 9, #17.** (II) Figure 951 shows a pair of forceps used to hold a thin plastic rod firmly. If each finger squeezes with a force Ft= Fb = 11.0 N what force do the forceps jaws exert on the plastic rod?

From the bottom grip to the center point which is P (measure 8.50 cm) and from P to the end of the rod measure (2.70 cm)

**Chap. 9, #21.**

(II) A traffic light hangs from a pole as shown in Fig. 955. The uniform aluminum pole AB is 7.50 m long and has a mass of 12.0 kg. The massof the traffic light is 21.5 kg. Determine (_a_) the tension in the horizontal massless cable CD, and (_b_) the vertical and horizontal components of the force exerted by the pivot A on the aluminum pole.

**Chap. 10, #17.** (II) A house at the bottom of a hill is fed by a full tank of water 5.0 m deep and connected to the house by a pipe that is 110 m long at an angle of 58º from the horizontal (Fig. 1050). (_a_) Determine the water gauge pressure at the house. (_b_) How high could the water shoot if it came vertically out of a broken pipe in front of the house?

**Chap. 10, #25.** (II) A spherical balloon has a radius of 7.35 m and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon

have a mass of 930 kg? Neglect the buoyant force on the cargo volume itself.

**Chap. 10, #32**. (II) A 0.48-kg piece of wood floats in water but is found to sink in alcohol in which it has an apparent mass of 0.047 kg. What is the SG of the wood?

**Chap. 10, #38.** (I) How fast does water flow from a hole at the bottom of a very wide, 4.6-m-deep storage tank filled with water? Ignore viscosity.

**Chap. 11, #8.** (II) A mass *m* at the end of a spring vibrates with a frequency of 0.88 Hz. When an additional 680-g mass is added to *m*, the frequency is 0.60 Hz. What is the value of *m*?**

**Chap. 11, #14.** (II) It takes a force of 80.0 N to compress the spring of a toy popgun 0.200 m to load a 0.180-kg ball. With what speed will the ball leave the gun?

**Chap. 11, #16.** (II) A 0.60-kg mass vibrates according to the equation where *x* is in meters and *t* is in seconds. Determine (_a_) the amplitude, (_b_) the frequency, (_c_) the total energy, and (_d_) the kinetic energy and potential energies when x = 0.30 m.

**Chap. 11, #36.** (I) A fisherman notices that wave crests pass the bow of his anchored boat every 3.0 s. He measures the distance between two crests to be 6.5 m. How fast are the waves traveling?

**Chap. 12, #2.** (I) A sailor strikes the side of his ship just below the waterline. He hears the echo of the sound reflected from the ocean floor directly below 2.5 s later. How deep is the ocean at this point? Assume the speed of sound in seawater is (Table 121) and does not vary significantly with depth.

**Chap. 12, #6.** (II) A person, with his ear to the ground, sees a huge stone strike the concrete pavement. A moment later two sounds are heard from the impact: one travels in the air and the other in the concrete, and they are 1.1 s apart. How far away did the impact occur? See Table 121.

**Chap. 12, #10.** (II) If two firecrackers produce a sound level of 95 dB when fired simultaneously at a certain place, what will be the sound level if only one is exploded? [*Hint*: Add intensities, not dBs.]

**Chap. 12, #24.** (I) The A string on a violin has a fundamental frequency of 440 Hz. The length of the vibrating portion is 32 cm, and it has a mass of 0.35 g. Under what tension must the string be placed?

Find the

bhdrkn

Answered by yoKev 5 years ago

**Find the tension in the two wires supporting the traffic light shown in Fig. 9-46**

$$\sum F_x = 0 \longrightarrow F_{T1} \cos{37^o}-F_{T2} \cos{53^o}=0$$

$$\sum F_y = 0 \longrightarrow F_{T1} \sin{37^o}+F_{T2} \sin{53^o}-mg=0$$

given,

$m=33 \text{ kg}$

$g=9.8 \text{ m/}s^2$

solving the system of equation above gives,

$$F_{T1} = 1.9 \times 10^2 \text{ N and } F_{T2} = 2.6 \times 10^2 \text{ N}$$

$\ldots$

**Excerpt from file: **. 9, #12. (II) Find the tension in the two wires supporting the traffic light shown in Fig. 946. (Picture) Traffic light hanging from two strings (String on the left angle is 53 degrees and the string on the right is 37 degrees) The traffic light weights 33kg. where m 33 kg, g 9.8 m/s2 solving

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**Excerpt from file: **1. Let S {b, h, j, n, u, x} be a sample space of an experiment and let E {b, h} and F {b, n, x} be events of this experiment. c Are the events E F and E F mutually exclusive? No 2. Let S {1, 6, 11, 16, 21, 26}, F {1, ...

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