A 55-kg woman cheats on her diet and eats a 540-Calorie (540 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm. (c) If the human body is only 25% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work offher breakfast?

Q: A 4-ton air conditioner removes 5.06×107 J (48,000 British thermal units) from a cold environment in…

A: (a) Write the formula for the EER. Thus,

Q: How long does a 65 kg adult need to walk at a rate of 5 km/h in order to burn off all the energy in…

A: Given Metabolic power for walking at  5 km/h is W=380 W Each slice of pizza contains energy of…

Q: How much work is done in blowing up a balloon from zero volume to a volume of 6.4 L, assuming that p…

A:

Q: For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at…

A: As we know that,  Work done on an object to displace something from its initial position = Force X…

Q: A 68-kg woman is planning to bicycle for an hour. If she is to meet her entire energy needs while…

A: A 68-kg woman is planning to bicycle for an hour. If she is to meet her entire energy needs while…

Q: When a hybrid car brakes to a stop, much of its kinetic energy is transformed to A. Heat B. Work C.…

A: The correct option is (C) Explanation- whenever car stops the car use friction brakes which inhibit…

Q: Question #: 23 If a person who normally requires an average of 12,000 kJ (~ 3000 Cal) of food energy…

A: If a person who normally requires an average of 12,000 kJ (3000 kcal) of food energy per day…

Q: According to the USDA, an average, \moderately active" college student needs to eat 2500 calories…

A:

Q: The box of a well-known breakfast cereal states that one ounce of the cereal contains 103 Calories…

A: The unit of energy can be converted from kilocalories to joule by multiplying with 4186 .   The…

Q: crate of fruit with a mass of 32.0 kg and a specific heat capacity of 3650 J/(kg⋅K) slides 8.80 mm…

A: According to work energy theorem Work done by net force = change in kinetic energy

Q: An electric kettle raises the temperature of tea from 50 °C to 125 °C with the usage of 15000 J of…

A:

Q: On a typical day, a 65-kg man sleeps for 8.0 h, does light chores for 3.0 h, walks slowly for 1.0 h,…

A:

Q: A 4-ton air conditioner removes 5.06×107 J (48,000 British thermal units) from a cold environment in…

A: (a)   The energy input of the air conditioner can be calculated as,

Q: Suppose a woman eats a 340 kcal cup of yogurt. How many minutes will the energy in the cup of yogurt…

A: The equation for the available energy or the output energy.

Q: A man sits with his back against the back of a chair, and he pushes a block of mass m = 6 kg…

A: Given,

Q: Dietary guidelines suggest an intake of about 1929 food calories per day for an adult human. There…

A:

Q: A 3.0 × 10-3 kg copper penny drops a distance of 50.0 m to the ground. If 65 percent of the initial…

A: Given data: Mass, m = 3.0 × 10-3 kg Height, h = 50m   Solution: The equation of the potential energy…

Q: A(n) 80.0-kg student eats a 160-Calorie doughnut. To burn-it-off, he decides to climb the steps of a…

A: Work done is equal to product of force and displacement and work done is stored in the form of…

Q: If I add 37,483 J of energy to an ideal gas inside a balloon, causing the internal energy to…

A: Given data The heat added inside the balloon is given as ∆Q=37483 J. The increase in internal…

Q: A 65-kg indoor rock climber eats an energy bar that has 500 kilocalories to fuel an afternoon of…

A:

Q: An “energy bar” contains 22 g of carbohydrates. If the energy bar was his only fuel, how far could a…

A:

Q: A weightlifter curls a 35 kg bar, raising it each time a distance of 0.60 m. How many times must he…

A: A slice of pizza contains 1260 J. A fraction of this energy can be used as work and the remaining is…

Q: What is the change in internal energy of a system which does 4.50×105 J of work while 3.00×106 J of…

A: The heat transfer in this case is

Q: If the net work is 89 kJ and the efficiency is 61% how much heat is added in the system? O 145.98 kJ…

A: When we are transferring energy or doing some work then all of the work does not go into the system.…

Q: If you have to climb eight stories at a height of 24 m above ground level. Then the extra calories…

A:

Q: An energetic athlete can use up all the energy from a diet of 4000 Cal/day. If he were to use up…

A:

Q: How many metres can a man weighing 60 kg climb by using the energy from a slice of bread which…

A: Given:  mass, m = 60 kg  Energy, E = 100000 calories efficiency = 28 %

Q: How much energy would you consume daily if you kept 3 lightbulbs of 25 watts on all day long?.

A: Power consumed by 1 bulb, p=25W Total power consumed by 3 bulbs=P=3p=75W 1 day, t=86400Seconds. so…

Q: If you have to climb eight stories at a height of 24 m above ground level. Then the extra calories…

A:

Q: Calculate the Efficiency of a bulb a)Lumen:800 W=60 b)Lumen:780 w=13 c)Lumen:806 w=7.5…

A: a) Efficiency = No. of Lumens / No. of watts => Efficiency = 800/60 => Efficiency = 13.33…

Q: If a typical city consumes electrical energy at a rate of 2.0 GW (that's 2 billion joules per…

A: Given data The power is given as P = 2 GW. The time duration is given as t = 14 weeks. The speed of…

Q: If a spring toy (mass of 10 gm) has a 50% efficiency rating, and you did 0.06 J of work to compress…

A:

Q: After eating a 200 g bottle of yogurt, Bob decides to go for a run to burn off the extra energy. The…

A: Given: Mass of the yogurt eaten by bob = 200 g Energy from the yogurt = 5.4 MJ/kg Metabolic rate of…

Q: How much work is required to lift a 300-kgkg refrigerator to the second-story level?

A:

Q: A runner generates 1260 W of thermal energy. If this heat has to be removed only by evaporation, how…

A: Given, time=15min=15x60=900s Thermal Energy = 1260W= 1260 J/s So, total energy produced in 15 min=…

Q: Calculate q when 29 J of work is done on a system and its internal energy increases by 96 J

A: work done on the system=  29 J Increase in internal energy = 96 J

Q: A 53−kg person drinks5.4×102g of milk, which has a caloric value of approximately 3.0 kJ/g.If only…

A:

Q: If a machine does 74.76 kJ of work after an input of 88.36 kJ of heat, what is the change in…

A:

Q: 8) A person consumes a snack containing 14 food calories (14 kcal). What is the power this food…

A: We have a food that is consumed containing an energy of E=14 cal=14×4.186=58.604 J which is to be…

Q: An engine does 18,500J of work and rejects 6550 J of heat into a cold reservoir whose temperature is…

A:

Q: What is the change in internal energy of a system which does 6.5×105 J of work while 3.00×106 J of…

A:

Q: The United States Patent and Trademark Office rejects claims for perpetual motion machines (in which…

A: According to the first law of thermodynamics, part of heat supplied to a system is used for…