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Concept explainers
A dance hall is built without pillars and with a horizontal ceiling 7.20 m above the floor. A mirror is fastened flat against one section of the ceiling. Following an earthquake, the mirror is in place and unbroken. An engineer makes a quick check of whether the ceiling is sagging by directing a vertical beam of laser light up at the mirror and observing its reflection on the floor. (a) Show that if the mirror has rotated to make an angle ϕ with the horizontal, the normal to the mirror makes an angle ϕ with the vertical. (b) Show that the reflected laser light makes an angle 2ϕ with the vertical. (c) Assume the reflected laser light makes a spot on the floor 1.40 cm away from the point vertically below the laser. Find the angle ϕ.
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Chapter 35 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
- Please solve this problem correctly please and be sure to provide explanation on each step so I can understand what's been done thank you. (preferrably type out everything)arrow_forwardUse a calculation to determine how far the fishing boat is from the water level .Determine distance Yarrow_forwardNo chatgpt pls will upvote Already got wrong chatgpt answerarrow_forward
- 2. 1. Tube Rating Charts Name: Directions: For the given information state if the technique is safe or unsafe and why. 60 Hertz Stator Operation Effective Focal Spot Size- 0.6 mm Peak Kilovolts MA 2 150 140 130 120 110 100 90 80 70 2501 60 50 40 30 .01 .02 .04.06 .1 .2 .4.6 1 8 10 Maximum Exposure Time In Seconds Is an exposure of 80 kVp, 0.1 second and 200 mA within the limits of the single phase, 0.6 mm focal spot tube rating chart above? Is an exposure of 100 kVp, 0.9 second and 150 mA within the limits of the single phase, 0.6 mm focal spot tube rating chart above?arrow_forwardQ: You have a CO2 laser resonator (λ = 10.6 μm). It has two curved mirrors with R₁=10m, R2= 8m, and mirror separation /= 5m. Find: R2-10 m tl Z-O 12 R1-8 m 1. Confocal parameter. b= 21w2/2 =√1 (R1-1)(R2-1)(R1+R2-21)/R1+R2-21) 2. Beam waist at t₁ & t2- 3. Waist radius (wo). 4. 5. The radius of the laser beam outside the resonator and about 0.5m from R₂- Divergence angle. 6. Radius of curvature for phase front on the mirrors R₁ & R2-arrow_forwardNo chatgpt pls will upvotearrow_forward
- SARET CRKS AUTOWAY 12. A stone is dropped from the top of a cliff. It is seen to hit the ground below after 3.55 s. How high is the cliff? 13. A ball is dropped from rest at the top of a building that is 320 m tall. Assuming no air resistance, what is the speed of the ball just before it strikes the ground? 14. Estimate (a) how long it took King Kong to fall straight down from the top of the Empire State Building (280m high), and (b) his velocity just before "landing". Useful equations For Constant Velocity: V => D X = V₁t + Xo For Constant Acceleration: Vr = V + at X = Xo+Vot + v=V+2a(X-Xo) \prom = V +V V velocity t = time D Distance X = Final Position Xo Initial Position V = Final Velocity Vo Initial Velocity a = acceleration For free fall Yf = Final Position Yo Initial Position g = 9.80 m $2 For free fall: V = V + gt Y=Yo+Vo t + +gt V,² = V₁²+2g (Y-Yo) V+Vo Vprom= 2 6arrow_forwardSolve the problemsarrow_forwardA 11 kg weight is attached to a spring with constant k = 99 N/m and subjected to an external force F(t) =-704 sin(5t). The weight is initially displaced 4 meters above equilibrium and given an upward velocity of 5 m/s. Find its displacement for t> 0. y(t) וןarrow_forward
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