the height of the Iguazu Falls is 82 m. A log of wood with mass 1350 kg moves at 7ms -1 in the water and tumbles over the falls. Answer these b. Calculate the kinetic energy of the log before it falls over the edge. c. Calculate the GPE of the log before it falls over the edge. d. Hence, calculate the total energy before the log falls over the edge.
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- 2. calculate the kinetic energy of a 0.134kg baseball traveling at 21.6m/s 3. how much work was done by the pitcher on the baseball in the previous problem?Two cars have the same mass, but one is moving three times as fast as the other is. How much more work will be needed to stop the faster car? A. the same amount B. twice as muchC. three times as much D. nine times as muchYour hand is wrapped around a cold iron bar. Your hand has 1000 J of thermal energy before touching the bar and 900 J after holding the bar for a minute. How much energy has the bar gained in the time of contact. A. 1000 J B. 900 J C. 100 J D. 1900 J
- a9-a485-4a31-b917-6585e366de43 Stewart, Justin As the ball rolls down the hill the ball speeds up and the outside of the ball gets a little warmer. What energy transformations are occurring? reen the ne ball O A. Thermal energy is transformed into gravitational potential energy and kinetic energy. O B. Kinetic energy is transformed into gravitational potential energy and thermal energy. O C. Gravitational energy is only transformed into kinetic energy. D. Gravitational potential energy is transformed into kinetic energy and thermal energy. O 11QUESTION 10 According to the Law of Conservation of Energy, energy can never be destroyed, but merely transferred from one form to another. Suppose you lift a 1 kg object into the air a distance of 5 meters by applying a force of 10 Newtons upwards. What can you say about the chemical energy used by your body after you lifted the object? a. You burned 50 Joules of chemical and transferred it to the object. b. You gained 100 Joule of chemical energy c. You gained 500 Joules of energy as the object transferred its potential energy to you. d. You lost 1000 Joules of energy in the process.Question 3 One of the largest waterfalls in the world, the Iguazu Falls, are located on the border of Argentina and Brazil. a. Research online to determine the height of the Iguazu Falls. (Cite your answer!) A log of wood with mass 1350 kg moves at 7ms-lin the water and tumbles over the falls. b. Calculate the kinetic energy of the log before it falls over the edge. c. Calculate the GPE of the log before it falls over the edge. d. Hence, calculate the total energy before the log falls over the edge. e. Calculate the velocity of the log as it hits the bottom of the waterfall. f. Discuss any limitations or assumptions regarding your calculation in part e.
- 1. A force of 240 N keeps a 900 kg car moving at a constant velocity of 10m/s. The car's engine supplies energy to the car at a rate of:A 69.7-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then drops through a height of 1.64 m, and ends with a speed of 8.51 m/s. How much nonconservative work (in kJ) was done on the boy? kJHow much work is done when a 4kg block of ice is moved from rest to a speed of 5m/s? A. 50 J B. 100 J C. 20 J D. 10 J
- No machine is 100 % efficient. What happens to the missing energy between input and output of work? A. The energy is converted to another form, such as heat. B. The energy is stored within the machine for later use. C. The energy is destroyed by the action of the machine. D. The energy is converted to momentum in an elastic collision.13. A 3000 kg car travelling at 10 m/s rolls down a steep driveway that has a vertical drop of 5.0 m. a) If we ignore friction, what is the car's speed at the bottom of the incline? b) If we include friction, and find that the heat generated along the driveway is 50 000 J, what is the speed of the car at the bottom of the incline?An object of mass 2kg collided with an object of mass 1kg that is at rest. After the collision the 2kg object has a speed of 2m/s and the 1 kg object has a speed of 8m/s. What is the initial speed of the 2kg object ?