Concept explainers
The Eco-Marathon is an annual competition sponsored by Shell Oil, in which participants build special vehicles to achieve the highest possible fuel efficiency. The Eco-Marathon is held around the world with events in the United Kingdom, Finland, France, Holland, Japan, and the United States.
A world record was set in the Eco-Marathon by a French team in 2003 called Microjoule with a performance of 10,705 miles per gallon. The Microjoule runs on ethanol. Create an algorithm to determine how far the Microjoule will travel in kilometers given a user- specified amount of ethanol, provided in units of grams. For your test case, you may assume that the user provides 100 grams of ethanol.
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Thinking Like an Engineer: An Active Learning Approach (4th Edition)
- The following data are given for a biogas digester suitable for the output of six cows. The volume of digester is 8.3 m3 , the volume of gas holder is 2.2 m3 and the retention time is 22 days. Find the height of gas holder in centimeter.arrow_forwardA Water Balloon Battle. You are launching water balloons at a rival team using a large slingshot. The other team is set up on the opposite side of a flat-topped building that is 30.0 ft tall and 50.0 ft wide. Your reconnaissance team has reported that the opposition is set up 10.0 m from the wall of the building. Your balloon launcher is calibrated for launch speeds that can reach as high as 90 mph at angles between 0 and 85.0° from the horizontal. Since a direct shot is not possible (the opposing team is on the opposite side of the building), you plan to splash the other team by making a balloon explode on the ground near them. If your launcher is located 55.0 m from the building (opposite side as the opposing team), what should your launch velocity be ((a) magnitude and (b) direction) to land a balloon 5.0 meters beyond the opposing team with maximum impact (i.e. maximum vertical speed)? (a) Number (b) Number IN IN Units Unitsarrow_forward1. Energy consumption in a country from 2001 to 2011 increased from 1041.3 million to 1526.1 million BOE (barrels of oil equivalent). If the high calorific value (HHV) of the oil is 141,000 kJ/gallon what is the increase in energy consumption over 10 years in Joule units. What is the rate of energy consumption per year? 2. Based on data on the rate of energy consumption per year from question no. 1, if the growth rate energy 2.5% per year, calculate the doubling time (td) and what is the approximate rate of energy growth in 2021.arrow_forward
- า In the first 3 years that Jill owns her sports car, she drives 63,350 kms. Jill maintains her vehicle according to the distance maintenance schedule below taking into consideration both kilometres driven and elapsed time. The fuel consumption rating for her sports car is 8.3 L/100 km. Each year, Jill pays $1960 for insurance and $98 for her vehicle license plate registration. During those 3 years, Jill renews her driver's licence at a cost of $80. The average cost of fuel is $1.06/L. Determine Jill's average monthly operating cost during the 3 years. Use the table provided (see attached) to organize your answers. Recommended Service Lube, oil and filter Tire rotation and brake inspection Wheel alignment inspection Automatic transmission Frequency (kms) 5000 10000 25000 Cooling system 50000 Tune-up and emission 85000 control Vehicle Maintenance Schedule 85000 H Frequency (months) 3 6 15 24 30 2 51 Approximate cost $36.95 $63.99 $79.95 $84.95 $165.00 $175 ONGOING DEMONSTRATION harrow_forwardIn a vehicle safety test, two vehicles are crashed into one another and a force sensor on one of the vehicles records the following curve for the force that it experienced as a function of time. Add to this graph a sketch of the force that the other car experienced as a function of time and use these two curves to explain why momentum is conserved in all types of collisions. Force (N) (0,0) Time (s)arrow_forward2 Your friend is planning to ride his bike up a ramp and land on the roof of a building as shown below. The building is 6.00 m high and 8.00 m away from the ramp. The ramp is 3.00 m wide and 4.00 m tall. 4.00 m 1 ← 3.00 m 6.00 m 8.00 m A. What is the minimum speed with which your friend needs to leave the ramp in order to land on the building? B. Another friend is going to use his motorized scooter for the same stunt. The maximum speed of the scooter is 15.0 m/s. How close to the building should you move the ramp so that your friend lands on the roof right at the front edge of the building?arrow_forward
- Course Home llege.com/course.html?courseld=17313546&OpenVellumHMAC=1c89e19b153e443490bb4df0da3b2ded#10001 to Review | Constants pour unistur very unu sıyın mm nyurve. Fv = 390 N Sur Previous Answers Mountaineers often use a rope to lower themselves down the face of a cliff (this is called rappelling). They do this with their body nearly horizontal and their feet pushing against the cliff (Eigure 1). Suppose that an 78.6-kg climber, who is 1.88 m tall and has a center of gravity 1.0 m from his feet, rappels down a vertical cliff with his body raised 40.4° above the horizontal. He holds the rope 1.54 m from his feet, and it makes a 20.7° angle with the cliff face. ✓ Correct Part D Figure 1 of 1 What minimum coefficient of static friction is needed to prevent the climber's feet from slipping on the cliff face if he has one foot at a time against the cliff? Express your answer using two significant figures. {—| ΑΣΦ ? fs= Submit Provide Feedback Next > P Pearson Copyright © 2022 Pearson…arrow_forwardYou have been asked by your supervisors at A&L Engineering to design a roller coaster for a new theme park. Because this design is in the initial stages, you have been asked to create a track for the ride. Your coaster should have at least two peaks and two valleys, and launch from an initial height of 75 meters. Each peak and valley should represent a vertical change of at least 20 meters. In your design, you should plan for a mass between 400 and 600 kilograms. Once you have designed the track, you have been asked to calculate the kinetic energy, potential energy, momentum, and work done by the cart at various points throughout the track. Unless otherwise stated, you can ignore the effects of friction. Following your calculations, you have been asked to describe the energy transfers detailed by these equations. Directions To complete this roller coaster design report, complete the following: Create a diagram of a roller coaster track containing at least two peaks and two…arrow_forward) Prof. K. took a Tesla Model S for a test drive. The car weighs 4,500 lb and can accelerate from | O to 60 mph in 2.27 seconds. The car has a 581 kW battery pack. Help Prof. K. determine the efficiency of the vehicle [Ans. to Check 55.5%). Note: The equation we learned in class P= F v ONLY APPLIES if velocity is constant. Use the steps below to guide your thought process. Develop a symbolic relationship for the force required to move the car forward. Compute the work done by the car (in Ib-ft). Calculate the power required to do this work (in kW). Ey el mp cul 2) After playing a game of pinball, you decide to do some calculations on the launching 9:09 AM P Type here to search 33°F Mostly sunny 3/7/2022 PrtScn Tnd Homearrow_forward
- As we explained in earlier chapters, the air resistance to the motion of a vehicle is something important that engineers investigate. The drag force acting on a car is determined experimentally by placing the car in a wind tunnel. The air speed inside the tunnel is changed, and the drag force acting on the car is measured. For a given car, the experimental data generally is represented by a single coefficient that is called drag coefficient. It is defined by the following relationship: F, where air resistance for a car that has a listed C, = drag coefficient (unitless) measured drag force (N) drag coefficient of 0.4 and width of 190 cm and height of 145 cm. Vary the air speed in the range of 15 m/sarrow_forward5. An engineer is planning to use gabion retaining wall to protect a section of Kennon road from landslide. A gabion is a wire mesh container filled with rocks. The engineer must estimate the volume of the rock to be used. If the gabion wall will have a thickness of 5ft, estimate the volume of the rocks given the measured depth of the wall every 10 ft of its width based from the road level. width, ft 10 20 30 40 50 60 70 80 90 depth, ft 5 12 20 18 17 13 10 5 a.) estimate the area of the wall using multiple trapezoidal rule with n=9 b.) estimate the area of the wall using single application of Simpson's 3/8 rule c.) estimate the volume of the rocks to be used using the area in a.) and b.)arrow_forwardSpecific fuel consumption of a four-stroke internal combustion engine at a given rotational speed is 0.322 kg/kW-h value is minimum. Spindle power at this rotation rate is 123 kW, volumetric efficiency is 95% and air-fuel rate is 15. The number of rotations of this engine is calculated by subtracting 1.5 from the number of rotations giving the minimum specific fuel consumption. time, spindle power 162 kW, specific fuel consumption 0.394 kg/kW-h and volumetric efficiency 85%. a) Calculate the air-fuel ratio in this case. and By what percent has the efficiency of the engine changed?arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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