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Big Ben, the nickname for the clock in Elizabeth Tower (named after the Queen in 2012) in London, has an hour hand 2.70 m long with a mass of 60.0 kg and a minute hand 4.50 m long with a mass of 100 kg (Fig. P10.27). Calculate the total rotational kinetic energy of the two hands about the axis of rotation. (You may model the hands as long, thin rods rotated about one end. Assume the hour and minute hands are rotating at a constant rate of one revolution per 12 hours and 60 minutes, respectively.)
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- Question #30. Please use the attached equation sheet and start with an equation from the sheet and work from there. You can manipulate anyway you want you just have to start from the equation sheet.February 3, 2009, was a very snowy day along Interstate 69 just outside of Indianapolis, Indiana. As a result of the slippery conditions and low visibility (50 yards or less), there was an enormous accident involving approximately 30 vehicles, including cars, tractor-trailers, and even a fire truck. Many witnesses said that people were driving too fast for the conditions and were too close together. In this problem, we explore two rules of thumb for driving in such conditions. The first is to drive at a speed that is half of what it would be in ideal conditions. The other is the 8-second rule: Watch the vehicle in front of you as it passes some object such as a street sign, and you should pass that same object 8 seconds later. On a dry road, the 8-second rule is replaced by a 3-second rule. a. Assume vehicles on a slippery interstate highway follow both rules. What is the distance between the vehicles? b. If a driver followed the first rule of thumb, driving at a lower speed, but used the 3-second rule instead of the 8-second rule, what is the distance between the vehicles? How does that distance compare with the visibility on the day of the accident? c. Suppose drivers do not follow either rule of thumb for slippery conditions. What is the distance between vehicles? How does that distance compare with the visibility on that day? d. Suppose a driver was not obeying either rule of thumb when she sees a tractor-trailer that stopped on the highway. She presses on her brakes, locking the wheels, and her car crashes into the truck. Estimate the magnitude of the impulse exerted on her car. e. Estimate the impulse on the car in part (d) had the driver followed both rules of thumb for slippery conditions instead of ignoring them.A suspicious physics student watches a stunt performed at an ice show. In the stunt, a performer shoots an arrow into a bale of hay (Fig. P11.24). Another performer rides on the bale of hay like a cowboy. After the arrow enters the bale, the balearrow system slides roughly 5 m along the ice. Estimate the initial speed of the arrow. Is there a trick to this stunt? FIGURE P11.24
- 2. A 59 kg person climbs up the stairs with a height of 5.5 m. a.How much work does the person do? b.What is the increase in GPE of the person at this height? c.Where does the energy come from to cause this increase in GPE?Question #3. The last person did the wrong number. Please use the attached equation sheet and start with an equation from the sheet and work from there. You can manipulate anyway you want you just have to start from the equation sheet.Given two vectors: M = -31 + 6j – 5k and N= -21 + 3j + k The vector dot product M.Nequals A. 29 B 19 10 No Answer E 0
- Are the following dimensionally homogeneous (these may not represent practical physical quantities)? A: B: P.t E F V P = power t = time E = energy A = area F = force = V = volume W = work = t A W. A² a. A and B b. A only O c. B only t Od. Neither A nor B1. The Washington Monument is 555 feet tall. A. If 1 meter = 3.28 feet, what is the height of the Washington Monument in meters? B. A worker assigned to the restoration of the Washington Monument is checking the condition of the stone at the very top of the monument. A nickel with a mass of 0.005 kg is in her shirt pocket. What is the gravitational potential energy (GPE) of the nickel at the top of the monument? C. What is the kinetic energy (KE) of the nickel in her shirt pocket at the top of the monument? D. If the nickel accidentally falls out of her pocket, what will happen to the gravitational potential energy (GPE) of the nickel as it falls to the ground? E. If the nickel accidentally falls out of her pocket, what will happen to the kinetic energy (KE) of the nickel as it falls to the ground?ASAPPP, answer the two questions then I will like. What is the dot product of the two vectors: A = 2i +3j -4k B = 7i – 2j + k
- If the speed of a particle is doubled, what happens to its kinetic energy? a. It will be half. b. It will be square root of twice as large. c. It will be four times bigger. d. It does not change e. It will be twice as big.Op-Amps - Homework Problem #2 Draw the graphs of V4, V5, V6 and describe them as cos equation V4=5sin(wt+60) V5=6sin(wt-240) V6=4sin(wt-20) Draw the graphs of V7, V8, V9 and describe them as sin equation V7=8cos(wt-30) V8=9cos(wt+90) V9=7cos(wt-90)Quèstion 11 dw If w = x2y sinz- 3zexy, find dz O a. dw =x?y cosz -exy dz O b. dw =2x2y cosz -exy dz Oc. dw =2x2y cosz - 3exy dz O d. dw =x2y cosz - 3exy dz A Moving to another question will save this response.