5 - Which of the following regarding mechanical energy is absolutely correct? A) Always protected B) The change in the mechanical energy of a system is equal to the work done on that system. C) It is the sum of kinetic and potential energies D) Preserved in environments where there is no friction force E) Protect in systems with conservative forces

Q: A 7.80-g bullet moving at 575 m/s penetrates a tree trunk to a depth of 5.50 cm. (a) Use work and…

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Q: 0. Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a…

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Q: Current Attempt in Progress A single force acts on a 0.61 kg particle-like object in such a way that…

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Q: 1. If anything else stays the same how many times will the drag increase if a vehicle changes its…

A: The drag force on a moving vehicle in a fluid media is given by Fd=12ρv2CdAwhere ρ is density of…

Q: car is moving towards a ramp at a speed of 9.0m/s, as shown below. The length of the ramp (not the…

A: speed of car (u) = 9 msLength of ramp (L) = 12 m efficiency (e) = 71% θ = 12o

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Q: Example 4 A bag of wheat weighs 100 kg. To what height should it be raised so that its potential…

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Q: A pump is required to lift 800 kg (about 200 gallons) of water per minute from a well 10 meters deep…

A: Power= (force× distance)/time P = mgh/t 1HP = 745.7 watt Potential energy = mgh Where, m = mass h =…

Q: A child weighing 300 N is on a swing supported by 1.50 m long ropes. Calculate the gravitational…

A: The potential energy of a body of weight W at a height h is given by P = Wh

Q: As an object moves from point A to point B only two forces act on it: one force is nonconservative…

A: Non-conservative forces are dissipative forces. These forces take energy away from the system as the…

Q: With the aid of necessary equations, explain total energy of a system.

A: We know that,the total enrgy of the system is sum of enrgies posse due to motion or due to the…

Q: (a) the power input to a ball if its kinetic energy increases from 11 J to 35 J in a time of 0.86 s…

A: Given data:  Initial kinetic nergy (KEi) = 11 J Final kinetic energy (KEf) = 35 J Time (t) = 0.86 s

Q: At which point would a skateboarder have the most kinetic energy? a) At rest at the top of a…

A: The kinetic energy of a moving object is given by;Where;m is the mass of the skateboarderv is the…

Q: 16. Which of the following is/are incorrect about the concept of business? I) If the sign of the…

A: We are given 3 statements about work done. The thermodynamics first law is about law of conservation…

Q: A 60 kg girl slides down a 4.0 m high sliding board.  Assume that there is no friction during the…

A: Given:  Mass of the girl = 60 kg Mass of the boy = 90 kg Height of the slide = 4m

Q: 9. can be stated as the net work done on an object is equal to the change in the object's kinetic…

A: Question to answer :   ___________ can be stated as the net work done on an object is equal to the…

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Q: 5- (Bonus Problem): As shown in the below figure a steel ball is hanged by a 60 cm rope with…

A: Given: The mass of the steel ball is 100 g or 0.1 kg.            The length of the rope is 60 cm or…

Q: 1. The difference between work and power is that: a) an object must move for work to be done, but…

A: a). An object must move for work to be done, but not for power to beexerted Incorrect option In…

Q: Ay=52 m Drawing not to scale V=20.0 m/s a) Calculate the snowboarder's mechanical energy at the top…

A: The mechanical energy is the sum of the potential and kinetic energy. hence,  E=12mv2+mgh where m is…

Q: Before the invention of the electric refrigerator in 1913, people kepi neir food cool with blocks of…

A: work done = Fx potential energy = - work done by conservative force

Q: A 50.-kg pole vaulter running at 10. m/s vaults over the bar. Her speed when she is above the bar is…

A: Given data:  Mass (m) = 50 kg Initial velocity (u) = 10 m/s Final velocity (v) = 1.0 m/s Required:…

Q: QUESTION 6 How much energy does it take to lift a 100 kg box from the floor to a 1.5 m high shelf?…

A: Given: m=100 kgh=1.5 m

Q: A coin starts from rest and slides down an incline. It then slides horizontally on the table until…

A: Initially, when the coin is at rest on the incline, total energy is equal to the potential energy.…

Q: An Average locomotive weighs about 470,000 Ibs. This particular Train locomotive is on its way back…

A: Given Data The mass of the locomotive is:m=470000 lbs=213188.414 kg The speed of the train is :v=15…

Q: 5) Answer these two questions: a) List the energy conversions that occur when riding a bicycle. b)…

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Q: A man climbing a mountain carryig a bag with mass 7.5 kg, after 30 min he reach 8.2 m height from…

A: Mass of the bag m=7.5 kg Weight of the bag Wb=mg Displacement of the bag h=8.2 m The work done from…

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A: Part (14):Given: The initial velocity of the object in the vertical direction is vi. The…

Q: Using a real world example that relates to environmental science find to places where potential…

A: Potential energy is the energy possessed by the body due to its position. As height from the ground…

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Q: List the factors you need to measure to calculate the mechanical energy of the skater when he is…

A: In absence of any dissipative force ,mechanical energy of a system remains conserved .In such…

Q: When a child descends a sliding board in a playground, does the total macroscopic mechanical energy…

A: Macroscopic mechanical energy is the sum of the kinetic energy (the energy of motion) and the…

Q: Course Contents » ... » PHYS-251-HW-6 » Work and Power for a Plane Engine Timer O Notes Feedback…

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Q: 14. BIO A 62.0-kg cheetah accelerates from rest to its top speed of 32.0 m/s. (a) How much net work…

A: Given value--- mass = 62 kg. final speed = 32 m/s. We have to find--- (a) How much net work is…

Q: You give a 5.0 kg box a quick shove up a ramp. It reaches a vertical height of 3.0 m before…

A: m = 5 kg h = 3 m vf = 0 m/s (Eth)f = 100 J g = 10 m/s2

Q: 3. In Energy Skate Park phet simulation, you could take measurements to calculate the initial…

A: Initially when the skater is at the top is at rest. Then, initial mechanical energy of the skater =…

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A: Since power of engine = Force × velocity = F × v = ma×v Using first equation of motion, a = (v-u)/t…

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Q: A student drags a 3 kg box 5 m across a rough floor with a force of 40 N. A frictional force of 10 N…

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