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A: Given that mass m=0.5Kg Height h=1.5m Total mechanical energy(E)=Kinetic energy+ potential energy…
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Q: Review. A boy starts at rest and slides down a frictionless slide as in Figure P8.45. The bottom of…
A: distance = d height = h
Q: Consider a roller coaster that moves along the track shown in the figure below. Assume all friction…
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Q: EK Eg (J) ET (J) (J) t(s) t(s) t(s)
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Q: - Who did more work? Explain
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A: Mass of pendulum bob,Speed at point B,from the figure,Air resistance is negligible.
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Q: Problem 3: Consider a box of mass 8.5 kg being accelerated along the floor at 2.9 m/s2. Randomized…
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Q: The figure shows the top view of an object of mass m moving on a uniformly rough horizontal surface.…
A: Given data: Mass of the object, m=7.15 kg Coefficient of friction, μ=0.644 Radius of the…
A test car and its driver, with a combined mass of M, are moving along a straight, horizontal track when a malfunction causes the tires to stop rotating. The car skids to a halt with constant acceleration, leaving skid marks on the road during the whole time it skids. Which two of the following measurements, taken together, would allow engineers to find the total mechanical energy dissipated during the skid? Select two answers. What is the most important thing you need to remember about those types of problem?
A)The coefficient of static friction between the tires and the track
B)The contact area of each tire with the track
C) The length of the skid marks
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- A 0.20 kg plastic cart and a 2.0 kg lead cart can both roll without friction along a horizontal track. Equal-size forces are used to push each cart forward for 1 m, starting from rest. After the force is removed at x 1m, which of the following statements is true?a. The kinetic energy of the plastic cart is less than the kinetic energy of the lead cart.b. The kinetic energy of the plastic cart is equal to than the kinetic energy of the lead cart.c. The kinetic energy of the plastic cart is greater than the kinetic energy of the lead cart.d. There is not enough information to compare the kinetic energies of the two carts.Write an explanation of your choice.Analyze the following situation. A student chooses the following energy bar charts to represent the energy for each location. However, one of the charts incorrect. Which one is incorrect? Explain why it is incorrect and propose a better solution. A toy car rolls along a track and up a hill to its highest point (C). Use the given Energy Bar Chart to identify the appropriate Bar Charts for locations A, B, and C. KEY: A: B: C: = Kinetic Consider effects of friction, air resistance, and collisions. B Tap to identify the appropriate Bar Charts for A, B and C = Grav. Potential Dissipated C Elastic Potential Option 3 of 6 Option 2 of 6 Option 5 of 6Mark pushes his broken car 150 m down the block to his friend’s house. He has to exert a 110 N horizontal force to push the car at a constant speed. How much thermal energy is created in the tires and road during this short trip?
- A puppy lifts up his favorite toy with his mouth performing 500 J of work.in 1.5 seconds. What is the power of the puppy? 333.3 W 250 W 515 W 750 WA 1 kg box is sliding with a speed of 2 m/s on a horizontal surface at x=0 m. The friction force is a function of the x coordinate which is 0.25N+0.040 x N/m. Use the work energy theorem to find how far this box slides before stopping. What is the coefficient of kinetic friction just before the box stops?When you ride a bicycle at constant speed, nearly all the energy you expend goes into the work you do against the drag force of the air. Model a cyclist as having cross-section area 0.42 m2 and, because the human body is not aerodynamically shaped, a drag coefficient of 0.90. a.) What is the cyclist's power output while riding at a steady 7.3 m/s (16 mph)? Use 1.3 kg/m3 as a value for the density of air. P= b.) Metabolic power is the rate at which your body "burns" fuel to power your activities. For many activities, your body is roughly 25% efficient at converting the chemical energy of food into mechanical energy. What is the cyclist's metabolic power while cycling at 7.3 m/s? PM= c.) The food calorie is equivalent to 4190 J. How many calories does the cyclist burn if he rides over level ground at 7.3 m/s for 2.0 h? c=
- A brick lies perilously close to the edge of the flat roof of a building. The roof edge is 50 ft above street level, and the brick has 470.0 J of potential energy with respect to street level. Someone edges the brick off the roof, and it begins to fall. What is the brick’s kinetic energy when it is 35 ft above street level? What is the brick’s kinetic energy the instant before it hits the street surface?Please answer and solve the question correctly. Thank you!A basketball is rolling down a hill. When you start watching it, it has a total energy of -11 Joules. When it reaches the bottom of the hill, it has a vertical position of -6 meters. If the basketball weighs 0.6 kg, what is the kinetic energy in units of Joules of the basketball when it reaches the bottom of the hill? Assume the system is closed and the effects of friction are negligible. Recall that g = 10m
- A child starts at rest and slides down a frictionless slide as in picture. The bottom of the track is a height h above the ground. The child then leaves the track horizontally, stiking the ground at a distance d as shown. a) Using conservation of energy, find the speed the child at the end of the slide b) Using your answer to part(a) and the equation related to a projectile, determine the initial height H of the child above the ground in terms of h and dFor its size, the common flea is one of the most accomplished jumpers in the animal world. A 2.10-mmmm-long, 0.470 mgmg flea can reach a height of 20.0 cmcm in a single leap. Part A Ignoring air drag, what is the takeoff speed of such a flea? Express your answer in meters per second. Part B Calculate the kinetic energy of this flea at takeoff. Express your answer in joules. Part C Calculate the kinetic energy per kilogram of mass. Express your answer in joules per kilogram. If a 77.0 kgkg, 2.00-mm-tall human could jump to the same height compared with his length as the flea jumps compared with its length, how high could the human jump? Express your answer in meters. If a 77.0 kgkg, 2.00-mm-tall human could jump to the same height compared with his length as the flea jumps compared with its length, what takeoff speed would the person need? Express your answer in meters per second. Most humans can jump no more than 60.0 cmcm from a crouched…After pushing a 27.8 kg kid and tricycle over 8.2 m of smooth, level sidewalk from rest, the "combo" is moving at 3.8 m/s. Find the combo's kinetic energy. Submit Answer Tries 0/10 And, what net force must have been delivered to the combo? Submit Answer Tries 0/10 Now you stop pushing and let the combo coast to a stop. The only force stopping the combo is the force of friction. If the force of friction is 6.9 N, how far will the combo coast before it stops? Submit Answer Tries 0/10