a) What is the highest speed Roger could have attained? What is the potential energy of the roller-coaster car when it is at the top of the b) loop? c) What is the kinetic energy of the car as it passes over the top of the 8 m hill?
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- Review A Bookmark Stewart, Justin Physics: Unit 3- Energy / 1 of 4/ Activity 1 Task: Potential & Kinetic Energy Activity 1 of 5 At what point in this roller coaster does the roller coaster have the most gravitational potential energy? A roller coaster starts from rest at point A. The mass of the cart with O A. Point A riders is 900 kg. The motor of the roller coaster does work to get the car up the hill to point B. From point B, the car relies on energy transformations to make it through the rest of the shown portions of the roller coaster. [g=9.8 m/s²] B. Point B C. Point C O D. Point D AA camera weighing 15 N falls from a small drone hovering 35 m overhead and enters free fall. What is the gravitational potential energy change of the camera from the drone to the ground if you take a reference point of a. the ground being zero gravitational potential energy? APE b. The drone being zero gravitational potential energy? APE What is the gravitational potential energy of the camera (with the reference point of zero gravitational potential energy taken to be a second person looking out of a building 30 m from the ground) c. before it falls from the drone? PE=| d. after the camera lands on the ground? PE Submit Question1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?
- A box with a mass of 7.0kg is lifted very slowly (with essentially zero acceleration), though a height of 1.5m, in order to place it upon the shelf of a closet. What is the increase in potential energy of the box? How much work was required to lift the box to this position?A 1,060 kg meteor strikes the surface of the Moon. What is the work done (in J) on the meteor by the gravitational field of the Moon, if we assume the meteor comes from deep space? The work done by the Moon's gravitational field is equal to the negative of the change of potential energy of the meteor-Moon system. You can assume the meteor comes from infinitely far. What is the final distance of the meteor, if it lands on the Moon's surface? You will need to look up two physical characteristics of the Moon to solve this problem. JHow high can we jump? The maximum height a typical human can jump from a crouched start is about 60 cm. By how much does the gravitational potential energy increase for a 66-kg person in such a jump? Where does this energy come from? Draw free-body diagram.
- An object with a mass of 15kg slides down an incline with a length of 6.0m at an angle of 28 degrees from horizontal. The coefficient of friction between the object and incline is 0.25 a) How much work does the gravitational force perform on the object? b) How much work does the frictional force perform on the object? c) What will its speed be as it reaches the bottom of the incline?A 3 kg ball falls from height of 14 m. What willbe potential energy of the ball after 1 second? Use g = 9.8 m/s2Q 3. Three cars are traveling at 30km/h, 50km/h and 200km/h, respectively. Each speed corresponds to a certain kinetic energy. a) Note down the expression for the kinetic energy of a moving object with a velocity v. b) Note down the potential energy for an object lifted up from the ground to height h. c) Based on a) and b) find an expression for the height as a function of velocity by assuming that the kinetic energy equals the potential energy of the same object. In other words find h(v) from which the object would need to be dropped and calculate the height so it has a speed of 30 km/h, 50 km/h or 200 km/h on impact with the ground. Assume free fall without air resistance d) Comment on your chances of survival if you are involved in head-on collisions for the three different speeds.
- An object moves along the x axis, subject to the potential energy shown in the figure. (Figure 1) The object has a mass of 2.4 kg and starts at rest at point A. A) What is the object's speed at point B? B) What is the object's speed at point C? C) What is the object's speed at point D? D) What are the turning points for this object? Check all that apply. Point A Point B Point C Point D Point EAn athlete throws a 1.5 kg ball with a horizontal speed of 9 m/s, from a height of 4.8 metres above the ground. a) Calculate the kinetic energy, gravitational potential energy and total mechanical energy of the ball at its starting position. b) Calculate the maximum speed attained by the ball, just as it reaches the ground's surface.