CLAIM and REASONING Template:  The ramp will need to be ___________meters high.  The law of conservation of energy states that __________________ If the skater could reach a speed of 12 m/s they had ____________J of energy. This means that they have _____________J of potential energy at the top of the hill. Based on calculations, the height of the ramp would need to be ___________meters high to reach this speed.

Person A and Person B are both using the same amount of work to lift something.  Person A takes half as much time to do it. Using the formula for power, explain which person has the most Power and why.

A musket ball, 0.2 kilograms, is shot with the speed of 313 meters per second into a metal can holding some clay.  The musket ball penetrates 0.134 meters into the clay before coming to a stop. What is the kinetic energy of the musket ball before it hits the clay? How much work does the clay do in stopping the musket ball, question mark? What forces the clay exert in stopping the musket ball?

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.)

Please use energy conservation ONLY to answer the following question!

A student uses a wheelchair to get around campus, which she travels to on a public bus. She boards the bus using a motorized lift attached near the bus door. The electric lift motor uses 1.4 kilojoules of energy to raise the student and wheelchair from the sidewalk to the level of the bus interior, a total displacement of 0.75 meters. If the mass of the wheelchair is 20 kilograms and the mass of the student and her belongings is 60 kilograms, what is the efficiency of the motor(Estimate g as 10 m/s2.)