- Calculations: (On a separate piece of paper) 1) Calculate the weight (force of gravity) of the student, using F_(g)=ma_(g) 2) Calculate the power of the student, P=W/Delta t for walking the stairs. 3) Calculate the equivalent horsepower of the student (hp). Note: 1hp=745.7W Questions: 1) Would the amount of work walking and running up the stairs be the same? Why? 2) Which would require more power, walking or running up the stairs?Why? 3) How many 60 W CFL lightbulbs could you power, assuming 100% efficiency? 4) In what sports must a person be able to generate a lot of force? Do much work? Develop great power? Name a clear, and different sport for each. (Hint: think of the relevant equations) 5) An average person needs about 2000 food Calories every 24 hours to survive. Calculate their average Power developed over 24 h (Note: 1foodCalorie=4.18kJ ). Remember that W=Delta E, work and energy are equivalent. 6) Using your power,calculate how many minutes you would have to walk stairs in order to "burn off" the energy in a Mars chocolate bar. A Mars bar contains about 190 Calories. (Note 1food Calorie=4.18kJ ). Remember that W=Delta E and assume all the energy is converted into mechanical energy. 7) If you could sell the energy you expended over 1.0 hour of walking stairs to your local Electric Company (assume 100% efficiency), how much money could you make?The price of electricity is 83 cents per 3.6 MJ.
- Motion Notes iii. An anvil sits atop a 4 m ledge with 275 joules of energy. How do we calculate it's mass?
- A 800kg car, traveling 16m/s to the right collides with a 3000kg semi truck initially at rest. After the 07s collision, the semi truck ends up moving 5.8m/s m/s right. vert Jvert =square unit before collision: P_(car)=square unit P_(truck)=square unit after collision: P_(car)=square unit P_(truck)=square unit What direction did the car move after the collision? square How fast did the car move after the collision? square square v What was the magnitude of the average impact force? square square
- How much heat is needed to convert 866 g of ice at -20^circ C to steam at 139^circ C? (The specific heats of ice, steam, and liquid are 2.03J/gcdot ^circ C,1.99J/gcdot ^circ C, fusion is 6.02kJ/mol and heat of vaporization is 40.79kJ/mol. square x Your response differs from the correct answer by more than 10% Double check your calculations kJ Supporting Materials (1) Periodic Table Constants and Factors Supplemental Data
- v. When you enter a belly flopping contest you have a kinetic energy of 25,000 Jas you make your big splash If your mass is 50 kg, what is your velocity as you hif the water?
