Windmill power The power P (in watts) generated by a windmill that has efficiency E is given by the formula P = 0.31ED?V', where D is the diameter (in feet) of the windmill blades and V is the wind velocity (in ft/sec). Approximate the wind velocity necessary to generate 10,000 watts if E = 42% and D = 10.

Q: One of the largest waterfalls in the world, the Iguazu Falls, are located on the border of Argentina…

A: Given: Mass of the log (M) = 1350 kg Velocity of the log before the fall (u) = 7 m/s Velocity of the…

Q: What is your conclusion about Work and Energy topic?

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Q: 25. It is defined as the rate at which work is done. mechanical energy O power work O joule O o o O

A: The work can be expressed as,  W=Fs Here, F is the force applied, and s is the displacement caused.

Q: Sam's job at the amusement park is to slow down and bring to a stop the boats in the log ride. If a…

A: Mass, m = 1200 kgInitial velocity, u = 0.5 m/sFinal velocity, v = 0 m/sWork done, W = ?

Q: A class 1 lever has a mechanical advantage of 1.5 and is used to lift a 10 kg object, the object was…

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Q: 4. Is the amount of work accomplished dependent on how long it takes to accomplish that work?…

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Q: maximum power transfer takes place at an efficiency Select one: a. 25 % b. 50 % c. 75 % d. 100 %

A: The efficiency is defined as the ratio of the out put power to the in put power.

Q: Eplain work, power and energy. Also state an example for each explanation and give its S.I unit.

A: Work: When an object is subjected to a force and the object gets displaced in the direction of the…

Q: Choose the correct definition of Average Power from following. O a. Work don divided by force is…

A: Power is defined as rate of work done. so, power P= work done/time taken

Q: An electric motor used to lift an elevator has power rating of 26.74 kW. If it can carry a…

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Q: A 67.3-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then…

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Q: Billy hung a 2.0 kg mass from a spring and lowered it gently until it was hanging at rest. The…

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Q: 2. The figure below shows the acceleration of a 10 kg package that is accelerated to a maximum…

A: Mass m = 10 kg maximum acceleration a = 20 m/s2 So, the acceleration is changing from 0 to 20 as…

Q: A winch raises a 100 kg mass a height of 8 m in 24.2 seconds.  The average power consumption of the…

A: Given  m=100kg h=8m t=24.2s Pi=500W g = 10 N/kg

Q: A machine puts out 400 W of power for every 1000 W put into it. The efficiency of the machine is

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Q: The kinetic energy is water is used to run turbines. a) True b) False

A: Option b

Q: effi 50 O60 O70 80

A: GivenInput Power, Pin=50 WMass of object, m=10 kgHeight, h=2 mTime, t=5 s

Q: Section B Answer ANY THREE questions in this section. Each question BI.ra) A pully system as shown…

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Q: A body does 26 Joules of work in 4. seconds. What is it's power?

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Q: system of four pulleys, two in a block is used to raise a weight of 800 pounds by a force of 200…

A: A pulley is a mechanism made up of wheels and ropes to lift heavy objects to tall places. Changes in…

Q: The power expended applying a force of 50 Newtons to lift a bucket a distance of 2 meters in a time…

A: Given  Weight of bucket ( w = mg) = 50 N  height (h) =  2m Time taken = 2.5 s  Power is defined as…

Q: what is horsepower

A: Horsepower is a unit of measurement used for Power. In layman terms, it is the amount of power an…

Q: Explain what does work do to the total amount of energy?

A: Work is said to be done when a force is applied through a distance.This means that when a force is…

Q: A forklift uses 5200 J of energy to lift a 50.0 kg mass to a height of 4.0 m at a constant speed.…

A: To calculate the efficiency of the forklift, we need to compare the useful output energy (the…

Q: The actual power output of a wind turbine with an efficiency of 45% is 1250kw. The predicted output…

A: Given data, Efficiency is given η=45 %. Output power Pout=1250 KW.

Q: 1. Motor M exerts a constant 25-lb force on the cable in the pulley system shown to the left. What…

A: Given data, Force on the cable FC=25 lb. Load is given FL=35 lb Height h=7 ft Efficiency of the…

Q: Question help

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Q: A pitching machine uses 122J of energy to throw a baseball with a mass of 0.145kg at a speed of 36.0…

A: Power is ratio of energy divided by time.  P=Et Power is measured in watt.

Q: A force of 5 N exerted on a small piston in a hydraulic press causes an output force of 500 N at the…

A: Force exerted on small piston (f) = 5 N Output force (F) = 500 N

Q: Define work (words and equations, include units)

A: in physics  work is a magnitude of force component in the direction of displacement and magnitude of…

Q: If you do 29 J of work in 2.1 seconds, how much power was generated? Round to the hundredths place…

A: Given  Work done (w)  = 29 J  Time taken ( t ) = 2.1 s   Power is definined as rate of work done .…

Q: Draw or Illustrate a concept map. Main topic: ENERGY TRANSFER (kinetic, thermal, gravitational…

A: Energy can neither created nor be destroyed but it can transfer from one form of energy to another…

Q: Angela is an Olympic figure skater. At the end of her performance, she spun. Her weight is 53 kg,…

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Q: In raising a 5000-N piano with a pulley system, the workers note that for every 3 m of rope pulled…

A: Image-1

Q: Suppose a 87.5kg sprinter acccerlates from rest to 11m/s in 3.1 s a)what is the power output in…

A: Mass (m) =87.5 kg Initial velocity (vi) = 0Final velocity (vf) = 11 m/s Time (t) = 3.1 s