22. A woman with a weight of wt = 140 lbs bench steps for t= 90 seconds at a cadence c = 17 steps/min. The height of the step is h = 25 cm. a) How much mechanical work was performed by the woman? b) What was her power output? c) Assuming an efficiency of EFF = 20%, how many kcal will she burn?
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- A car engine produces a constant power of P = 341 hp. The car and motor have a combined mass of m = 1830 kg. 1.) The car starts from rest, after t=5 seconds, what is the cars speed, you may assume no energy is required to spin the tires. 2.) Assume a dragster of mass m=1000kg can accelerate to cover 450 m and accelerate in 7.2 s from a dead stop, how much horsepower is the engine producing, assuming acceleration is constant?This time, the pendulum is 1.07 m long and has a mass of 3.19 kg. You give it a push away from vertical so that it starts swinging with a speed of 1.02 m/s. Due to friction at the pivot point, 1.00 Joule of the pendulum s initial kinetic energy is lost as heat during the upward swing. What maximum angle will it reach, with respect to the vertical, before falling back down? 18.1 degrees 20.5 degrees 19.3 degrees 11.4 degreesThe unit of work, joule, is dimensionally the same as: a. Newton‑meter b. Newton/kilogram. c. kg•m2/s2 d. a and c e. a and b f. b and c
- C. Work Problems: 4. F = 90 N d=5m W=? 7. W = ? F = 62.6 N d=13 m 5. F = 6 N W = 72 J d=? W 20 8. W = 13.2 J F=2N d=? 2019 1009.0 6. W = 120 J d = 24 m F=? 9. W = 136 J d=27.2 m F=? LOOT W WAI 10. If 360 Joules of work are needed to move a crate a distance of 4 meters, what is the weight of the crate? monocroq silt eftil notevals odT 10tavolo ne no ets и 000 gnidgisw noensq A.01 bozu zaw 15wo rloum 11. If a group of workers can apply a force of 1000 Newtons to move a crate 20 meters, what amount of work will they have accomplished? to zoluol OST soubong of boboon ai omit doum woH.II 12. If 68 Joules of work were necessary to move a 4 Newton crate, how far was the crate moved? GOL 13. How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes.I. General setup - 0.5 m Object of known size (e.g., piece of paper) String Nut / Object II. Prediction questions and background physics For this experiment, you will release the object from rest and observe its subsequent motion. Before conducting the experiment or doing your analysis, answer the following questions based on your understanding of the physics of motion and conservation of energy:What does the percent difference between GPE and KE tell you about the Efficiency of energy transformations in this experiment ?
- This time, the pendulum is 1.93 m long and has a mass of 3.17 kg. You give it a push away from vertical so that it starts swinging with a speed of 1.62 m/s. Due to friction at the pivot point, 1.00 Joule of the pendulum s initial kinetic energy is lost as heat during the upward swing. What maximum angle will it reach, with respect to the vertical, before falling back down? 18.7 degrees 21.5 degrees 31.8 degrees 26.7 degrees7. John has 200 Joules of potential energy when he is standing on a diving board. a. Find his mechanical energy. b. John jumps off of the diving board. What is his potential energy when he is halfway to the water? C. What is his mechanical energy when he lands in the water?