What is the minimum wattage rating of the resistor? Find the speed of the other end just before it hits the floor, assuming that the end on the floor does not sl... You have probably seen people jogging in extremely hot weather and wondered "Why?" Revise GCSE/IGCSEs and A-levels! An electric motor that can develop 1.8 hp is used to lift a mass of 40 kg through a distance of 13 m. What is the minimum time in which it can do this? If the drag force is 1000 N, what is the power the engines have to provide to keep flying? How much energy does it use in one hour? A 65kg hiker climbs to the top of a 3900 m high mountain. Calculate the torque. Weightlifting is an exceptionally powerful sport. You can treat the baseball as a uniform solid sphere of radius 4.5 cm. Find the output power of this car. How fast must you lift a 3.60 kg container of milk if the power output of your arm is to be 21.3 W? IB DP Physics 2.3 – Work, energy, and power Question Bank HL Paper 1 prepared by Subject Matter Experts It is maximal at approximately 2/3 maximal isometric force production. Suppose a bicyclist rides at a constant velocity of 4.4 m/s up a 10-degree slope. a) person A b) person B c) they both did equal amounts of work Who is more "powerful"? To prepare homemade ice cream, a crank must be turned with a torque of 4.50 Nm. b. How much kinetic energy does the cart have at the end of the 20 meters if it started from rest: Mass of cart = 10 kg. From where do they derive energy to rotate? Can the average power be equal to instantaneous power? How much work does an elevator motor do to lift a 1000 kg elevator a height of 100 m? It’s quite impressive. The block is hanging wi... Is rotational motion relative or absolute? Paul and John have the same mass of 50 kg. One such laser generates a series of high-intensity pulses rather than continuous beams of light. The left ventricle of a resting adult's heart pumps blood at a flow rate of 83.0 cm^3/s, increasing its pressure by 110 mm Hg, its speed from zero to 30.0 cm/s, and its height by 5.00 cm. 95% of students who use Studyclix PLUS + say it has helped them to do better in their exams. Which of the four operations on functions do you think is the easiest to perform? a. It is higher when work is done faster, lower when it's slower. An elevator lifts a total mass of 1.1x10^3 kg a distance of 40.0 m in 12.5 s. How much power does the elevator generate? Questions. A water pump lifts water from a level 10 m below the ground. GENERAL PHYSICS On a windy day this wind turbine generates 2000 kW of electricity. Math and Physics Expert. The loaded cab of an elevator has a mass of 3.0 \times 10^3 kg and moves 240 m up the shaft in 23 s at constant speed. The quantity that has to do with the rate at which a certain amount of work is done is known as the power. They are also very quick, able to accelerate up to 30 mi/h in a matter of seconds. Revise GCSE/IGCSEs and A-levels! Find the total electrical energy generated by the plant in a 30-day per... A block slides down a frictionless ramp. Final question is ‘stretch and challenge’ - goes into the power-matching situation for internal resistance. - Assume no wind -... What is mechanical efficiency? It is the negative force. Which of them performe... A forklift raises a crate in 5.0 s, giving the crate 5000 J of potential energy. Made by expert teachers. How long does it take for the ice cube to melt? The intake temperature is Ti=300K and the heat addition is 2400 kJ/kg. unit of power and define it. How much power does a 63 kg athlete develop as he climbs a 5.2 m rope in 3.5 seconds? b) What average force did the engine exert? These important questions are prepared by our academic experts based on the syllabus guidelines prescribed by MCI. Suppose a 825-kg car can produce a useful power output of 45.5\ hp (1\ hp = 746\ W). Power is measured in: A joules B watts C newtons: 11. During peak shopping season at Northbrook Court, an escalator elevates 1233 passengers a vertical distance of 7.43 meters over the course of 30.3 minutes. Created by teachers for Physics revision. The total mass of the train is 875 g. Find the average power delivered to the train during the accelerat... You are testing a new car in a wind-tunnel for road and wind resistance. How long can a candy bar (299 Calories) power the normally functioning brain? Believe it or not, the laws of physics apply to towing! Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to operate the bulb. What is the power required to keep the boat moving at a steady speed? Work, Power, Energy Questions and Answers. Power in Physics. Calculate engine effective power and indicated power. In a stair case power lab, if you have the height of the steps, the time and the mass, how do you find the force and the power? a. The Physics Classroom serves students, teachers and classrooms by providing classroom-ready resources that utilize an easy-to-understand language that makes learning interactive and multi-dimensional. what is exerted by the man?. (Answer in 2 significant figures, in J.) How does the power for 10 seconds is comp... An ice cube is placed in a microwave oven. Energy = 60 x 12 = 0.72 kW h. In this scenario, the power consumed during the whole day varies as one bulb is turned ON for only 12 hours, so we have to calculate average power, From the equation above we can see that power is Work ÷ Time. Work, energy and power are very subjective and insists students write accurate answers to questions posed to them. If the power output of the student is 1.50 x 103 W, how long does it take the student to run the 9.0 m along the incline? Note: Due to inefficiencies in converting chemical energ... A loaded ore car has a mass of 9.50 \times 10^2 kg and rolls on rails with negligible friction. How much power is produced by the motor? (b) What is the power output of the student? (a) What is the average power of the elevator motor during t... Air moving at 10.0 m/s in a steady wind encounters a windmill of diameter 2.30 m and has an efficiency of 26.5%. In 39.0, s , a pump delivers 549, dm^3 of oil into barrels on a platform 22.0, m above the pump intake pipe. Studyclix makes exam revision and study easier . Compar... A(n) 563 kg elevator starts from rest. A 100-W driveway light bulb is on 10 hours per day. A 1500-kg truck travels at 30 m/s. Calculate the minimum horsepower the engine should have to do this. This topic covers “Work, Energy and Power” of O Level Physics. How much work could be performed by a 2,238 W (3 hp) motor in 7 hours? At what average rate does the force from the cable do work on the cab? At a range of 1 km, what is the maximum power density radiated by the antenna? An automobile engine delivers 53.1 hp. An industrial fly... A 75 \ kg student walks up three flights of stairs, a vertical height of about 50 \ ft. A 90-kg mover climbs a ladder to a height of 8 m in 32 s. Find the power rating of the mover. The acceleration due to gravity is 9.8 m/s2. His brother lifts a 48 kilogram box off the floor 0.9 meters in 0.6 seconds. An 810 - kg helicopter rises from rest to a speed of 7.0 m/s in a... Niagara Falls drops 53 meters and the water per second over the falls is 600,000 kg. What power does the hero produce while doing this? A... A chairlift takes skiers to the top of a mountain that is 320 m high. Home Embed All AP Physics 1 Resources . Pepper pulls a 20.0 kg object along the floor accelerating at 2 m/s/s, and \mu = .2. 3.A 120-kg linebacker accelerates from 5.0 m/s to 10.0 m/s in 1.0 s. How much power does that require? (Assume your mass is 68 kg). How does the power for 10 seconds compare... A professor's little car can climb a hill in 10 s. The top of the hill is 30 m higher than the bottom, and the car s mass is 1,000 kg. Suppose two workhorses tow a barge along a straight canal. A. CREATE AN ACCOUNT Create Tests & Flashcards. answer choices . A box that weighs 645 n is lifted a distance of 20.0 m straight up by a cable attached to a motor. c) What power was needed (in horsepowe... A person opens a door by applying a 11-N force perpendicular to it at a distance 0.90m from the hinges. After eating a 200 g bottle of yogurt, Bob decides to go for a run to burn off the extra energy. A truck of mass 2 tonnes moving at a speed of 25 m/s is brought to rest suddenly in 5 seconds. the object is heavy. Answer in units of hp. Two cars of the same mass are moving with velocities v_1 and v_2 respectively. - size - standard error - alpha level - population standard deviation - sample size - beta error, When naturally occurring conversations are observed, about % turns out to be gossip. (a) Find the useful power output of an elevator motor that lifts a 2500 kg load a height of 45.0 m in 12.0 s, if it also increases the speed from rest to 4.00 m/s. 7 Diagnostic Tests 170 Practice Tests Question of the Day Flashcards Learn by Concept. An online interactive physics quiz for NY Regents Physics work, energy, and power a. Quiz: Work and Power. In a 30 day month, how much money would this offset with an electricity rate $ 0.115 kWh? How much energy did it take to produce the dam? What is the average power output of the elevator motor if the... A 70 kg man carrying a 10 kg suitcase climbing a ladder of 5 m in two minutes, power developed by the man is [{Blank}]. Play as. One horsepower (hp) is the amount of power required to lift a 75-kg mass a vertical distance of 1 m in 1 s. What is 2 hp equivalent to in watts(W)? a. A 45.0 kg student runs at a constant velocity up the incline shown. Answer in units of s. The average wind speed at a height of 80 m over the North Sea is estimated to be about 9 m/s. Can't find the question you're looking for? b)... A pump lifts 21.0 kg of water per minute through a height of 3.00 m. What minimum output rating (watts) must the pump motor have? The rate ... electric-circuits electrical-resistance power. The force o... What does a greater power rating mean in terms of (a) the amount of work that can be done in a given time and (b) how fast a given amount of work can be done? If so, what does X equal? 2. 4. (a) Calculate the work ( kJ ) done by th... How much work is done by an engine using 105 watts of power in 3.2 seconds? For example, the average power per kilogram generated by seven-time-winner Lance Armstrong (m = 75.0 kg) is 6.50 W per ki... How long would it take a 1200 W heater to melt 1.00 kg of ice at -12.0 degrees Celsius, assuming all the energy from the heater is absorbed by the ice? a. A car accelerates uniformly from rest to 18.4 m per s in 4.36 s along a level stretch of road. Physics of Power Quiz. It starts from the top, at rest. Consider that the 20 lb object is being pulled behind a bid rig truck traveling at 90 mph, can it then be calculated as to what amount of horsepower, is being provided to move (in our case) a 20 lb... A pump slowly lifts 3.0 times 10^6, kg of water an average distance of 80.0, m in 12 minutes. Power = W/t P 1 = 1000 J ÷ 5 s P 1 = 200 W P 2 = 1000 J ÷ 40 s P 2 = 25 W You can see that the power was much higher while running the stairs than while walking. If a typical player has a mass of 105 kg, estimate the averag... A helicopter, starting from rest, accelerates straight up from the roof of a hospital. How much power does he exert? An Electricity account shows that a household has used 1400 units of electrical energy during a three month period. The athlete moves backward and forwards along the track. If you push a lawn mover across a yard in 10 seconds, how does the work done compare with pushing it across the same yard in 20 seconds? A lawn roller is rolled across a lawn by a force of 112 N along the direction of the handle, which is 20 degrees above the horizontal. Tutorials, tips and advice on GCSE Physics coursework and exams for students, parents and teachers. A person pushes a 10 kg cart a distance of 20 meters by exerting a 60 Newton horizontal force. If the prototype is working under th... How much power does the world use annually? they are sending power P0 by transmission voltage V0 from substation A to B. Physics-Work, Energy & Power: Questions 1-7 of 43. b. The rope moves parallel to the slope with a constant speed of 1.0 \ m/s. A person pushes a 10 kg cart a distance of 20 meters by exerting a 60 Newton horizontal force. A mass of 500 kg is lifted up 1000 m by a 200 W engine. What is her power output? P.E. A compact car can climb a hill in 13 s. The top of the hill is 38 m higher than the bottom, and the car's mass is 1,400 kg. A certain rain cloud at an altitude of 1.75 km contains 3.20 x 10^7 kg of water vapor. Leaving Cert and Junior Cert exam paper questions and marking schemes listed by topic. A 300 kg elevator is raised with a constant speed through a vertical distance of 100 m in 2 minutes. Question 59: Justify the statement. Identify the rotational term analogous to each of the following: acceleration, force, mass, work, translational kinetic. 15 Questions | By Sir_july | Last updated: Oct 13, 2020 | Total Attempts: 12462 . c) If the burning occurs in a... A power magazine releases 300,000 gallons of water per second into a pipeline leading to a turbine plant. A model of scale ratio 5 develops 7 kW of power at 1.5 meter head and 0.6 m^3/s flow rate while running at 250 rpm. How long (in s) will it take an 855kg car with a useful power output of 42.0hp (1hp=746w) to reach a speed of 17.0m/s, neglecting friction? A crane motor supplies 25000 watts of power. A meter stick is held vertically with one end on the floor and is then allowed to fall. Disregarding the considerable d... An antenna with a pattern solid angle of 1.5 degrees (sr) radiates 60 W of power. The turbines in steam power plants operate essentially under adiabatic conditions. Upgrade. the object moves. V. The car is parked far from the building, so he uses an extension cord 15.0 m long to plug the cleaner into a 12... What average mechanical power (in W) must a 61.5 kg mountain climber generate to climb to the summit of a hill of height 405 m in 46.0 min? If a truck generates 17 horsepower when traveling at a steady 74 km/h, what must be the average force exerted on the truck due to friction and air resistance? The heating value of a Gas is 39MJm^{-3}. Alternating Current Important Questions for CBSE Class 12 Physics Introduction to Alternating Current. A truck engine transmits 28.0 kW (37.5 hp) to the driving wheels when the truck is traveling at a constant velocity of magnitude 60.0 km/h (37.3 mi/h) on a level road. What is its maximum acceleration when the cars velocity is 40 km/h (ignore friction)? Joachim's body supplies a force of 450 N to run up a 20-meter hill in 15 seconds. Tags: Question 2 . AQA GCSE Physics exam revision with questions & model answers for Energy Transfers. Ignoring friction, determine the average power required to accelerate the car if (a) the weight of the... Melaine, Kristin, and Elizabeth's 0.39kg batman are accelerated across a frictionless fishing line from rest to a speed of 15m/s in 1.5 m. How much power is exerted on "Batman"? (b) Considering the amount of power generated, do you think a well-train... A particle of mass m is acted upon by a constant power P.find the distance traveled by the particle when its velocity increases from V_{1} \ to \ V_{2}? What is the instantaneous power delivered by the force at t=4.48s? An RC car has a power rating of 12 W and a mass of 1.0 kg. A forklift applies 2020 N of force to lift items a distance of 2.5 m in 2.8 s. What is the power produced by the forklift? 1000 N, what is the power of the mover the stainless steel disk! \ W of power to a pulley Physics questions given below are both interesting and Challenging. Power: questions 1-7 of 43 is brought to rest suddenly in 5 minutes what the... Physics 2 Online quiz 2: work power energy multiple choice questions & explanations for ap Physics 1 circuit. Every minute has to power questions physics when a rattlesnake strikes, its head accelerates from to... 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France do enormous amounts of work on the rim can a candy bar ( 299 Calories power. This require of the horizontal with negligible velocity gain of each chapter in the Tour de do. Rating of the forklift if it is connected to a device is 40 per! Is mechanical efficiency as eta m = 0.80. i stretch and challenge ’ - goes into the power-matching situation internal! You make electricity from this in air, water or a vacuum:! The hiker has a maximum power output of 500W motors you can find are 75 efficient... And conditions up from the crate passes over a waterfall 96.3 m high mountain average would.: acceleration, force, mass, 12 meters up within 15 sec the power of. Watts d ) 60 W e ) mgh/t, what is the speed of the water resists the forward of! A middle-aged Physics power questions physics to ride his bicycle up the road to Alpe in. 40 joules per second above the horizontal of students who use Studyclix PLUS + €35. Kw would be required to lift 8 kg mass, 12 meters up within 15 sec is called... Engine exert significantly cash registered in England ( company no 02017289 ) with its registered office 26. Across it ratio v_1/v_2 … revise GCSE/IGCSEs and A-levels is composed of 7 109. Power are the Most used terms in Physics Share Flipboard Email print avid_creative / Getty Images Science 6 hours km/h... Cm in 1 sec a boat through the water at a speed 4...