At which point or points is the total energy at its maximum value? At which point or points is the kinetic energy positive?
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At which point or points is the total energy at its maximum value?
At which point or points is the kinetic energy positive?
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- The skateboarder shown below has a potential energy of 2,800 J at a height of 4 meters. Assuming there is friction on the track, how high will the skateboarder reach on the other side of the track? (5a; DOK 1) 2 O meters More than 4 meters because gravity will do positive work on the skateboarder. Less than 4 meters because friction will do negative work on the skateboarder.We know from the reading that it is possible to move the same object two different distances and still do the same amount of work. Let's consider an example in which Jane pushes a block of ice up an incline while Kip lift the same block of ice vertically to the top of the same incline. See the figure below. (look at picture) We will assume that there is no friction between the surface of the incline and the block of ice. Both of these situations will require the same amount of work and that the result of lifting the ice block to some height imparts potential energy to the ice. In this activity, we will make various calculation to help us better understand the relationship between work and potential energy and the idea of conservation of energy. For this activity we will assume that the mass of the ice block is 5.6 kg and the vertical height of the incline is 2 m. This is the vertical distance that Kip must lift the block of ice. We will assume that the acceleration due to gravity is 10…A hurricane wind blows across a 8m x 17m flat roof at a speed of 135 km/h. Calculate the force exerted on the roof. Hint: The thickness of the roof is small, so the change in potential energy between the inside of the house and the outside can be approximated to be zero. ρair =1. 28 kg/ m3 .
- Due date: wed, Oci T6 2019 **34. Initially, a 10-kg block is sliding along a level floor at a speed of 5 m/s. The coefficient of kinetic friction between the block and the floor is exactly 0.5. a) What are the initial kinetic, potential, and total energies of the block? b) What is the force of friction by the floor on the block? c) What is the work done by the frictional force as the block slides 2 m across the floor (i.e., how much energy is removed from the system)? d) What are the final kinetic, potential, and total energies of the block? e) What is the block's speed after sliding 2 m?Isn't there a way to solve this by only using the work and energy? W = F(Delta X) W = 1/2mv_{final}^2-1/2mv_{initial}^2 Potential Energy = MGH I understand how to solve this with regular FBD and newtons laws. I want to see the way to solve it using work and energy.A man whose mass is 70 kg walks up to the third floor of a building. This is a vertical height of 12 meters above the street level, a) how many joules of work had he done? b) By how much has he increased his potential energy?, c) If he climbs the stairs in 20 seconds, what was his rate of working in hp?
- A man whose mass is 70 kg walks up to the third floor of a building. This is a vertical height of 12 meters above the street level, a) how many joules of work had he done? b) By how much has he increased his potential energy?, c) If he climbs the stairs in 20 seconds, what was his rate of working in hp? Solution FBD and Formula RequiredA skier drops her 0.312-kg glove from rest at a height h into fresh powder snow.The glove falls to a depth d = 0.147 m below the surface of the snow beforecoming to rest. If the nonconservative work done on the glove is Wnc = -1.44 J,what is the drop height of the glove?