Consider two houses that are identical, except that the walls are built using bricks in one house, and wood in the other. If the walls of the brick house are twice as thick, determine which house that will be more energy efficient. Justify your answer.
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- 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? answerAfter 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?A 27.0 kg child slides down a long slide in a playground. She starts from rest at a height h11 of 23.00 m. When she is partway down the slide, at a height h22 of 13.00 m, she is moving at a speed of 6.80 m/s.Calculate the mechanical energy lost due to friction (as heat, etc.).
- A leaky 10-kg bucket is lifted from the ground to a height of 15 m at a constant speed with a rope that weighs 0.5 kg/m. Initially the bucket contains 45 kg of water, but the water leaks at a constant rate and finishes draining just as the bucket reaches the 15-m level. Find the work done. (Use 9.8 m/s2 for g.)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?A bucket is filled with sand so that the total mass (sand and bucket) is 15 kgs. The bucket is to be lifted to the top of a 30 meter tall building by a rope of negligible weight. However, the bucket has a hole in it, and leaks 0.2 kgs of sand each meter it is lifted. Find the work done lifting the bucket to the top of the building. Joules