A peregrine falcon surveys the landscape. It flaps its wings to maintain a constant speed of 10 m/s and a constant elevation of 100 m above the flat ground. What is the primary energy transformation taking place? a) Ug→ K b) Echem→ K c) W→ K d) Echem→ Ug f) Echem e) Echem→K+ Ug Ethermal The 0.8 kg peregrine falcon tucks it wings and stoops, reaching a terminal velocity of 90 m/s. What is the power dissipated by air drag while this bird is falling at terminal velocity? a) O W b) 90 W c) 706 W d) 720 W e) 784 W f) 3240 W

Part III: Open Response Springs and ropes are ideal. g=10m/s U(x) (joules) 2 1 3 4 5 6. 7 x (meters) The above graph shows the potential energy U(x) of a 0.1 kg object as a function of its position x. Suppose the object has a constant total energy of 4.0 joules, as shown by the dashed line on the graph. 7. (a) Label all points of stable equilibrium and unstable equilibrium on the graph. (b) What happens to the speed of the object as it moves from 2m to 4m? (c) Can the object reach the position x = 0.5 m? Explain. (d) What is the velocity and the acceleration of the object at x = 6.0 m?

12:45 1 4) A roller coaster of mass 80.0 kg is moving with a speed of 20.0 m/s at position A as shown in the figure. The vertical height above ground level at position A is 200 m. Neglect friction. 200 m 160 m -- Potential Energy 0 A.What is the total mechanical energy of the roller coaster at point A? B. What is the total mechanical energy of the roller coaster at point B? C. What is the speed of the roller coaster at point B? Explain your D. What is the speed of the roller coaster at point C? answer

After finishing 2 fried eggs, a sausage, and a cup of latte as breakfast at 8:30 am, Nancy starts biking at constant speed of 15 km/h. Food Energy content in Cal Fried egg 100 Sausage 286 Latte 260 Big apple 125 Slice of 380 pepperoni pizza 12 oz soda 160 Activity Metabolic power (W) Cycling at 15 km/h 400 Walking at5 km/h 280 a) What time Nancy will use up all the intake energy due to biking? b) If Nancy decide to walk back at 5 km/h for an hour then bike at 15 km/h, how many slice of pizza she needs to eat together with a can of 12 oz soda and a big apple as lunch?

Problem 4: Energy that is not utilized for work or heat transfer in the human body is converted to the chemical energy of body fat, which contains about 39 kJ/g. How many grams of fat will you gain if you eat 2650 kcal one day and do nothing but sit relaxed for 16.0 h and sleep for the other 8.00 h? (Assume sleeping burns 1.2 kcal/min, while sitting relaxed burns 1.7 kcal/min.) mfat =

38

A CHEB hours, 58 minutes, 34 seconds. mpletion Status: QUESTION 12 Two objects interact with each other and with no other objects. Initially object A has a speed of 5 m/s and object B has a speed of 10 m/s. In the course of their motion they return to their initial positions. Then A has a speed of 4 m/s and B has a speed of 7 m/s. We can conclude: O A. mechanical energy was decreased by conservative forces OB. mechanical energy was increased by conservative forces OC. mechanical energy was decreased by nonconservative forces O D. mechanical energy was increased by nonconservative forces O E. the potential energy increased from the beginning to the end of the trip RENG RANG B one level to a higher level after passing through an intermediate valley. The track is in a distance d. The block's initial speed is vo = 5.4 m/s, the height differen

Superman can throw a ball (mass 145 g) 1000 m/s. Suppose Supermanthrows a ball straight up into the air at 1000 m/s. i. What is the initial kinetic energy of the ball? ii. How high would the ball go if the force ofgravity is constant F = −mg? (use conservation of energy and neglect air resistance). iii. How high would the ball go if you use F = − (GMEm/ r2) ? ME = 5.97 × 1024 kg, and assume the ball is thrown from rE = 6.37 × 106 m

Suppose you were able to convert the energy used by light bulbs into kinetic mechanical energy that move objects. If you burnt a 60.0 W for 2.500 hours, how far could an object be pulled if a force of 5.0x103 N is supplied?

When your hands are cold, you can rub them together to warm them. Explain the energy transformations that make this possible.