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In 2001 , the first iPodTM by Apple had a rated battery life of 10 hours (h) to run audio files. The 6th model, introduced in 2009, had rated battery life of 36 hours [h] to run audio files. If the average song is 3.5 minutes [min], how many more songs can you listen to using the 6th model iPod rather than the original iPod on a single battery charge?
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- FIGURE 1: Wind tunnel experiment to measure how the force of air resistance depends on velocity. A free-falling object such as a bungee jumper is subject to the upward force of air resistance. We assumed that this force was proportional to some power b of velocity as in Fu=CaVb where Fy = the upward force of air resistance [N = kg m/s2 ], Ca = drag coefficient (kg/m), and V = velocity [m/s]. An individual is suspended in a wind tunnel and the force measured for various levels of wind velocity. The result might be as listed in Table 1 V (m/s) 15 30 45 60 75 90 Fu (N) 65.5 227.9 472.9 793.7 1186 1646.7 Table 1: Experimental data for force (N) and velocity (m/s) from a wind tunnel experiment. Find least sqaures approximation Fy=C,Vb to the data given in Table 1.arrow_forwardChrome File Edit View History Bookmarks People Tab Window Help McGraw-Hill Campus - ALEKS Science - CHM1045 GEN CHEM 1 BLENDED 669113 A bconline.broward.edu/d21/le/content/466883/fullscreen/12868783/View McGraw-Hill Campus - ALEKS Science O GASES Interconverting pressure and force A chemistry graduate student is designing a pressure vessel for an experiment. The vessel will contain gases at pressures up to 470.0 MPa. The student's design calls for an observation port on the side of the vessel (see diagram below). The bolts that hold the cover of this port onto the vessel can safely withstand a force of 2.80 MN. pressure vessel bolts side View port Calculate the maximum safe diameter w of the port. Round your answer to the nearest 0.1 cm. O cm Explanation Check O2021 McGraw-Hill Education. All Rights Reserved. Terms of Use FEBarrow_forwardFrom a fundamental point of view, there are two distinct ways to describe motion. Match the movement description with the movement name. Lagrangian [ Choose ] Eulerian [ Choose ] Newtonian [ Choose ]arrow_forward
- In order to fnd the specifc heat c of an unknown substance, you place 75 g of the substance in a 30 g copper calorimeter that contains 65 g of water, all initially at 20 °C. You then add 100 g of water at 80 °C, and measure the fnal temperature of the system to be 49 °C. Assuming no heat is lost to the environment, what is c? [Answer: c = 2200 J/kg. K] 즈arrow_forwardRevisit Example 6 from your Module 4 notes. Consider the well-insulated, rigid tank having a volume of 10 [ft']. Previously, it contained saturated water vapor at 212°F at state 1. The water was rapidly stirred until the pressure was 20 [lbfin'). In class we showed that the temperature at state 2 was 445°F and the work done during this process was -31.3 (Btu]. Now, if insulation were removed from the tank, and the water is cooled at constant volume from T2 = 445°F to T3= 300°F without stirring the water, determine: a) The pressure at the state 3 in [Ibfin*), and b) The heat transfer during the process in [Btu).arrow_forwardA structural member 10 cm long must be able to support a load of 50,000 N without experiencing any plastic deformation. Given the following data for brass, steel, aluminum, and titanium, find weight of the lightest alloy in accordance with these criteria. Answer the weight in grams only. Alloy [Brass] [Steel] Ultimate Yield tensile Density strength strength (grams/cm³) (MPa) (MPa) 415 600 860 800 [Aluminum] 310 [Titanium] 550 8.5 700 7.9 435 2.7 4.5arrow_forward
- A particle is subjected to the action of two forces: F1 = 2.5 i-3j+ 6 k [kN] and F2 = 5 i+6j-5k [kN]. The magnitude of the resultant force is: %3D %3D Select one: Oa. FR=-8.139 [kN] %3D Ob. FR 8.139 [kN] Oc. FR = 5 [kN] Od. FR=-5 [kN] Activate Win ype here to seatch 445 PEarrow_forward1. Find the force required to move a load of 300 N up a rough plane, the force being applied parallel to the plane. The inclination of the plane is such that a force of 60 N inclined at 30° to a similar smooth plane would keep the same load in equilibrium. The coefficient of friction is 0.3. [Ans. 146 N]arrow_forward18. Type of house A house owner has an annual electricity demand of 12500 [kWh], covering all her energy needs, including hot tap water. She has enough panels to produce 15000 [kWh] annually. The OEF of her PV-systems is 0.6, the OEM is 0.5. There are no batteries. Is her house: ONearly zero energy Net zero energy Positive energy Zero energyarrow_forward
- A company is feeling adventurous and is expanding into a new market with a new product. They are currently testing out a subassembly of their new product – what the product is and does is confidential. The subassembly consists of a spring, which is attached to a slider, which is on a fixed rod in a vertical plane. The slider is 10 [lb] and does not experience friction. When undeformed, the spring has a length of 14 [in]. The spring has a constant, k = 4 [lb/in]. Determine: a) The force exerted by the rod on the slider at Point A b) The force exerted by the rod on the slider at Point B NOTE: Both Points A and B are on the curved section of the rod The slider is released from rest in the position shown in the diagram Use the following diagram. k = 4 [lb/in] %3D 14 [in] 10 lb | A 14 [in] В 14 [in] 14 [in]arrow_forward|The following processes occurs in a rever sible thermodynamic cycle: 1-2: Reversible polytropic compression at pressure X)bar at volume Y)m' to a pressure [Z]bar and specific volume (A]m'/kg. The index of compression may be taken as n. 2-3: Reversibly expansion with expansion index of 2 to pressure [B/bar. 3-1: Reversible cooling at constant volume to the initial state.arrow_forwardThe rotating blade of a blender turns with a constant angular acceleration 1.50 [rad/s^2].a. How much time does it take to reach an angular velocity of 36.0 [rad/s^2] starting from rest? b. Through how many revolutions does the blade turn in this time interval? c. What are the tangential acceleration and tangential speed of an ant sitting on the blade 10.0 cm from the axis of rotation during the end of this interval? d. What is the moment of inertia of the ant if its mass is 10.0 g? e. What is the rotational kinetic energy of the ant?arrow_forward
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