Q3 (A) A pump lifts 30 kg of water a vertical distance of 20 m each second. What is the power output? (b): A sports car is moving at 4.0 m/s. If the mass of the car is 800 kg, how much kinetic energy does it have?
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A: Given data Weight of the person W = 600 N time taken t = 10 s Power is defined as the work done per…
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A: Given: m = 800 kg v = 7.5 m/s h = 8.7 m t = 4 s…
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Q: average power delivered
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Q: a 1000 kg sports car accelerates from zero to 25m/s in 7.5 seconds. What is the average power…
A: Mass, m = 1000 kgInitial velocity, u = 0 m/sFinal velocity, v = 25 m/sTime, t = 7.5 s
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A: Given Data: The mass of the sled is, m=70 kg The length of a horizontal sled is, l=20 m The…
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A: work done by a force, W=∫12F.ds=∫12F×cos(θ)×ds where θ is angle between force F and displacement ds…
Q: Bob is pulling a box of his toys of mass 15.0 kg along a rough horizontal surface for a distance of…
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Q: A child pulls on a wagon with a force of 75 N. If the wagon moves a total of 30 m in 2.0 min, what…
A: Given , Force = 75 N Displacement s = 30 m Time = 2 minutes
Q: Suppose you lift a 20 kg box by a height of 1.0 m. a) How much work do you do in lifting the box?…
A: Part-a Given: The height upto which the box is lifted h = 1 m. The mass of the box m = 20 kg.
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A: Given data: Force (F) = 500 N Speed (v) = 23 m/s Required: The power (P)
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Q: A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting…
A: Mass of helicopter M= 780 kg Iniatial speed of helicopter u = 0 Final speed of helicopter v= 10.0…
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Q: You throw a 24.0 NN rock into the air from ground level and observe that, when it is 14.0 mm high,…
A: weight = 24 N mg = 24m = 24/9.8 m = 2.45 kg H = 14 m V = 16 m/sA)Using work energy theorem…
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- A shooting star is the trail of a meteor - a chunk of debris hurtling through Earth’s atmosphere. As drag slows down the meteor, its energy is converted into thermal energy. A typical meteor may only weigh 2 grams, and enters the Earth’s atmosphere at a speed of 100,000 mph. Assuming that all of its energy is converted into thermal energy over a time of just 3 seconds, what is the power output of the shooting star? How does this compare to the power output of a typical household lightbulb?A girl with a 40 kg mass is riding an 8 kg bike. At the top of the hill her speed is 6 m/s and her speed triples at the bottom of the hill. The hill is 15 m high. What is the work done by the non conservative forces?A person pulls a 20 kg heavy box horizontally, which slides at a constant speed. The person makes a force of 60 N in the first 6.88 m. Then she starts to get tired. The force it exerts then begins to decrease linearly until it extinguishes in the next 6.88 m. The moment the person's strength runs out, the box no longer moves. How much work did this person do on the box? What is the starting speed of the box?
- A 1000kg car moving at 22.8 m/s on a flat road slams on the brakes and skids to a stop. The coefficient of kinetic friction between the road and car tires is 0.587. How many meters does the car go before it comes to a complete stop? (hint: think of Work-Energy theorem, and friction equation)A box is on the floor. You lift the box and place it on a shelf that is 3.85 meters from the floor. If it takes 201 J of work to do this, what is the mass of the box?How much work must you do to push a 12 kg block of steel across a steel table at a steady speed of 1.3 m/s for 7.7 s ? The coefficient of kinetic friction for steel on steel is 0.60. Express your answer in Jules. What is your power output while doing so? Express your answer in watts.
- Your job is to lift 25.0 kg packaged boxes a vertical distance of 1.0 m from the ground onto the bed of a delivery truck. How many packaged boxes would you have to load onto the truck in one minute for your average output power that goes into lifting the boxes to be 0.11 hp?During a tug-of-war match, team A pulls on team B by applying a force of 1100 N to the rope between them. The rope remains parallel to the ground. How much work does team A do if they pull team B towards them by a distance of 4 m?A motorist runs out of gas on a level road 210 m from a gas station. The driver pushes the 1,120 kg car to the gas station. If a 180 N force is required to keep the car moving, how much work (in J) does the driver do?
- A 1200-kg sports car is advertised to accelerate from 0-100 km/h (27.78 m/s) in 3.00 s. What is the power output of the car in hp? 1 hp = 746 W 01 207 hp 325 hp 200 hp 175 hpA 10 kg barbell is rolling down a hill. There is no friction or air resistance acting on it, only the force of gravity. If it starts out moving 2 ms1, and ends up moving 7 ms1, then how much work does gravity do on it?A cheerleader lifts his 68 kg partner straight up off the ground a distance of 0.72 m before releasing her. Assume the partner’s velocity is zero at the beginning and the end of the lift. The acceleration of gravity is 9.8 m/s2 . If he does this 22 times, how much work has he done? Answer in units of J.