5) The graph shows the kinetic energy of a car as the driver steps on the gas pedal. a) What is the power output of the car? (b) If the process is 30% efficient, determine the power delivered to the car. 200 150 100 50 0 0 10 20 30 40 50 60 tIME (3)
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5) The graph shows the kinetic energy of a car as the driver steps on the gas pedal.
a) What is the power output of the car?
b) If the process is 30% efficient, determine the power delivered to the car.
………
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- A small car and a semi-truck have the same total mechanical energy. Which of the following CANNOT be true? Question 3 options: The car must be moving faster than the truck and the truck and car are at the same height. The car is going the same speed as the truck and the truck and car are at the same height. The car is going the same speed as the truck and the car is at a higher elevation than the truck. The car is at a higher elevation and both the car and the truck are stationary.speed will be v=3.76ms A water skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 72kg water skier has an initial speed of 6.0m/s. 5.0 seconds later, the speed increases to 11.2m/s. What is the net work done on the water skier? If we assume the efficiency in converting kinetic energy from the boat to the water skier is only 20%, what is the power of the boat? What is the amount of work done by the resistive force during the 5-second period? Answer: W =m(v -v)- 3219.84J × 3.2×10°J net 3219.84J The power of the boat will be P=- = 3.2x10 W 0.2x5s =-3.2×10'W×0.8×5s =-1.3×10ʻJ resistive W. 3Vx vx (m/s) 2 A 0 A -2 200evin Bə BCDE F t The diagram is the velocity-versus-time graph for a 3.10 kg object moving along the x-axis. Determine the work (in J)done on the object during the time interval AB. Submit Answer Tries 0/10 Determine the work (in J)done on the object during the time interval BC. Submit Answer Tries 0/10 Determine the work (in J)done on the object during the time interval CD. Submit Answer Tries 0/10 Determine the work (in J)done on the object during the time interval DE. Submit Answer Tries 0/10 Determine the work (in J)done on the object during the time interval EF. Submit Answer Tries 0/10 T
- 1480 kg car accelerates uniformly from a position of rest to a speed of 95 km/h in 6.0 s. a) Calculate the car's acceleration. b) How far did the car travel during this acceleration? b) How much work was done by the car during this 6.0 s?Which of the following statements are true? Select all correct. Question 3 options: If an object speeds up, then the total work done on the object was positive. If an object moves at a constant speed, then the work done by each individual force is zero A force must be parallel to the displacement to do any work. If a force is perpendicular to displacement, it does zero work. If a force has a component in the opposite direction of the displacement, it does positive work. If an object doesn't move, then the work done by every individual force must be zero.Estimate the kinetic energy (in GJ) of a 96,000 metric ton aircraft carrier moving at a speed of at 22 knots. You will need to look up the definition of a nautical mile to use in converting the unit for speed, where 1 knot equals 1 nautical mile per hour.
- 1. A certain car can accelerate from rest to the speed v in T seconds. If the power output of the car remains constant, (a) how long does it take for the car to accelerate from v to 2v? (b) How fast is the car moving at 2T seconds after starting? Explain and draws.Answer both or NONE question 1 - For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. What is the metabolic power, in kW (kiloWatts)? Your answer needs to have 2 significant figure, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. Question 2 - The metabolic power for typing is 150 W for Lili, not a lot as you know probably. How long does it take to burn off the energy in a slice of apple pie, which energy content is 1680 kJ (400 food calorie), in minutes? (Try to stay active, working/studying in front of a computer is not the best exercise you can do for your body.)Suppose you are biking at a constant speed up a road inclined at 5° above the horizontal. You need to bike up this hill for 200 m in 2 minutes or less. There is an average drag force of 25 N as well. Calculate the minimum amount of power in hp your body must provide in order to make it up this hill in time. Assume 80 kg total mass of yourself and bike and 25% energy efficiency in your body. Define a system and draw energy state diagrams as part of your solution. Draw any necessary FBDs for forces. B
- 1. A 23.0 kg child is playing on a swing with a length of 2.5 m. If the swing starts from rest and makes an angle of 40.0◦ with the vertical at the top of the swing, a) determine the child’s speed at the bottom of the swing neglecting friction. b) If the swing has a speed of 2.8 m/s at the bottom, determine the work done by friction during the downswing and, bonus) assuming the force of friction is constant, determine the maximum angle the swing attains on the upswing after passing through the bottom. Hint: Use the approximation that cos θ ≈ 1 − 1 2 θ 2 for angles given in radians.A fully loaded, slow-moving freight elevator has a cab with a total mass of 1000 kg, which is required to travel upward 52 m in 2.5 min, starting and ending at rest. The elevator's counterweight has a mass of only 940 kg, so the elevator motor must help pull the cab upward. What average power is required of the force the motor exerts on the cab via the cable? Number i UnitsAnswer this question in GRESA format. Given Required Equation Solution and Answer