Additional info:
Meal = 1720 Kilocalories
Mass of myself = 50 kg
Additional info: Meal = 1720 Kilocalories Mass of myself = 50 kg The Joule () is...
A. Food Energy. Energy is stored in food as the potential energy of the electrical bonds in molecules. Your body converts food energy to mechanical energy and heat. Food energy is expressed in “calories”, which are actually kilocalories (kcal, with 1 kcal= 4.185 kJ) How many joules are in a 130-kcal serving of breakfast cereal? B. A glass of 1 percent milk contains 130 kcal. How many glasses would a 70-kg person have to drink to get the energy needed...
5. A 1000-kg car is at the top of a hill as shown, where its elevation above the bottom of the hill is 120 m. a. What is its gravitational potential energy? 120 m b. If the cart starts from rest and rolls down the hill with negligible friction and air resistance, what will its kinetic energy be when it reaches the bottom? c. What will be its speed when it reaches the bottom? Suppose instead that there is noticeable...
In the figure, a frictionless roller coaster car of mass m = 637 kg tops the first hill with speed v0 = 19.3 m/s at height h = 37.2 m. How much work does the gravitational force do on the car from that point to (a) point A, (b) point B, and (c) point C? If the gravitational potential energy of the car-Earth system is taken to be zero at C, what is its value when the car is at...
You are testing a new roller coaster ride in which a car of mass m moves around a vertical circle of radius R. In one test, the car starts at the bottom of the circle (point A) with initial kinetic energy Ki. When the car reaches the top of the circle (point B), its kinetic energy is Ki/4, and its gravitational potential energy has increased by Ki/2. What was the speed of the car at point A, in terms of...
Einstein's mass-energy equation is E=mc 2 , where mass is in kilograms and the speed of light is 3.00×108m/s. The unit of energy is the joule (4.184J=1cal;1000cal=1kcal,1J=1kg⋅m2/s2). A. Calculate the energy released, in calories, when 5 g of matter is converted to energy. Express your answer with the appropriate units. B. Calculate the energy released, in kilocalories, when 5 g of matter is converted to energy. Express your answer with the appropriate units. C. A bowl of cornflakes supplies 110...
1. I drag a mass m = 21 kg in a straight line, along a horizontal surface, a distance D=23 m . I drag it at constant speed v = 0.90 m.s^−1 in a straight line using a horizontal force. The coefficients of friction are μs = 1.2 and μk = 1.1. How much work do I do? W = _____ J . ( Retain accurate values until the final calculation, but remember significant figures. ) 2. A rubber band has mass m...
4. A roller-coaster car with a mass of 250 kg carries a 75 kg passenger and starts from rest from a point 20 m above the ground. At point C, it is 15 m above the ground. A. What is the initial potential energy of the car (in kJ) at point A? - 75 kg 250. kg B. What is the potential energy at point B? C. If the initial kinetic energy was zero and the work done against friction...
P 254-Fall 2018 Recitation Practice Problems Oct 18, 2018 PE- KE- OJ 1) Consider a 2,00 kg toy cart on a frictionless hill as shown in the diagram to the right. a) find the gravitational potential energy at the top PE KE- b) find the gravitational potential energy at the bottom 13 m 2 m c) find the kinetic energy at the bottom 2)a) Consider an object which starts with 2 J of kinetic energy and ends with 5 J...
I need help with problem 39 parts b,c,d Unit 7. Work and Energy In Class Packet Name: 36. A 2.45 kg rock is dropped from the top of a 15.5 m vertical cliff a. What is the potential energy of the rock relative to the base of the cliff before it is dropped? b. What is the kinetic energy of the rock just before it hits the ground below? c. What is the velocity of the rock at a point...
orms. at, or is of Part A If two FA The energy required for the hypothetical reaction 2A +B=2C + 2D is 303 kJ as written How much heat is absorbed when 3 60 mol of A reacts ? Express your answer to three significant figures and include the appropriate units. View Available Hint(s) 13A 5 - 0 - ? Value Submit Part B Complete previous part(s) Provide Feedback es > Week Eleven HOMEWUIR? Part A Classily the following examples...