A weightlifter curls a 35 kg bar, raising it each time a distance of 0.60 m. How many times must he repeat this exercise to burn off the energy in one slice of pizza?  Assume 25% efficiency. Energy content of one slice of pizza is 1260 kJ.

Q: You are boiling water in a pot on the stove for your herbal tea. There is 0.15kg of water in the pot…

A: Mass of water (M) = 0.15kg Initial state : Liquid at 100°C temperature Final state :  Solid at…

Q: A 68 kg cyclist is pedaling down the road at 15 km/h, using a total metabolic power of 480 W. A…

A: The cyclist spends only about 25% of the total metabolic power (P) generated in his body to propel…

Q: At room temperature, a single oxygen molecule, with mass of 5.31x10^-26 kg typically has a kinetic…

A: mass (m) = 5.31×10-26 kg kinetic energy of each molecule = 6.21×10-21 J

Q: In a given location, would a helicopter require more energy in summer or winter to achieve a…

A: Helicopter requires more energy in summer to create the same lift . In summer since temperature is…

Q: On his honeymoon, James Joule attempted to explore the relationships between various forms of energy…

A: At the water falls, the water will fall from a certain height it would convert its potential energy…

Q: If 10 kJ of thermal energy is added to the system and 10 kJ of work is done by the system, what…

A: The thermal equilibrium depends upon the temperature of the bodies ket in contact with each other.…

Q: This time, the pendulum is 1.07 m long and has a mass of 4.92 kg. You give it a push away from…

A: length (L) = 1.07 m mass (m) = 4.92 kg initial speed = 2.88 msenergy lost = 1 J

Q: A lawnmower engine ejects 1.00 x 104 J each second while running with an efficiency of 0.200. Find…

A:

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: 300J of energy are transferred to a system in the form of heat while the thermal energy increase by…

A: Given data The change in internal energy is ∆U=150 J. The energy transferred to a system is ∆Q=300…

Q: it is the form of energy that is done by a system to its surroundings if the sole effect on…

A: Given that it is the form of energy that is done by a system to its surroundings if the sole effect…

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: From what height must a block of ice be dropped so that it melts completely on falling? Assume…

A: The amount of heat per unit mass transferred during change of state of substance is called latent…

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: A 68 kg cyclist is pedaling down the road at 15 km/h, using a total metabolic power of 480 W. A…

A: The total chemical energy (C.E) (metabolic power) can be converted into thermal energy (Th.E) and…

Q: A worker drives a 0.500 kg spike into a rail tie with a 2.50 ksledgehammer. The hammer hits the…

A: The expression for kinetic energy (KE) KE = 12× Mass (m) × {speed (v)}2

Q: Rocky spends all the afternoon hours watching sports on cable TV. In the process, he does 1,179 J of…

A:

Q: A 68 kg cyclist is pedaling down the road at 15 km/h, using a total metabolic power of 480 W. A…

A: Given: The mass of the cyclist is m=68 kg. The speed of the cyclist is v=15 km/h. By applying…

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: 2 of surface area 34°C, ε=0.9 skin and is outside exercising on a h=10 W/m2K, 15°C day. The student…

A: Given:- Area A = 1.5 m2  Surface Temperature T1 = 340 C  Emissivity e = 0.9  h = 10 W/m2K  The…

Q: A 1.0 x 102-kg steel support rod in a building has a length of 2.0 m at a temperature of 20.0°C. The…

A: Part A:

Q: A block (4 kg) starts from rest and slides down a frictionless ramp #1 of height 9 m. The block then…

A: Since you have posted multiple parts we will solve the first three parts for you, kindly post the…

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 1700 kg Buick moving at 83 km/h brakes to a stop, at uniform deceleration and without skidding,…

A:

Q: During running, you lost 4.0×104 J of heat, and your internal energy also decreased by 1.6×105 J.…

A: Change in Internal energy, ∆U=-1.6×105J Heat lost, Q=-4.0×104J

Q: A 62.0 kg skier is moving at 6.90 m/s on a frictionless, horizontal, snow-covered plateau when she…

A: The given values are, m=62.0 kgvi=6.90 m/sL=4.80 mμk=0.300h=2.50 m

Q: If a 32.8%-efficient Carnot heat engine (left figure) is run in reverse so as to form a refrigerator…

A:

Q: A 1,500 kg car traveling at 13.4 m/s (30 mph) applies its breaks and comes to rest in 5.5 seconds.…

A:

Q: What is the change in internal energy of a car if you put 12.0 gal of gasoline into its tank? The…

A:

Q: Which condition results to work done greater than the change in internal energy?     ΔU > 0; ΔS >…

A:

Q: When you put on the brakes on your bicycle, friction heats the steel rims of your wheels. Could this…

A:

Q: It is important for the body to be able to cool itself even during moderate exercise. Suppose a 70kg…

A:

Q: A heat engine operating between energy reservoirs at 20°C and 600°C has 30% of the maximum possible…

A:

Q: While walking you give off 4.0x10^5J of heat and your internal energy decreased by 6.0x10^5 J. How…

A: Given information: Here, ΔQ is the heat released by the person’s body while walking, and ΔU is the…

Q: What is the change in internal energy of a system that takes in 4.53 x 106 ) of heat, and does 4.50…

A: The amount of heat transfer by a system can be given as, Q=Qin-Qout=4.53×106 J-8.67×106 J=-4.14×106…

Q: A heat engine does 4.6 × 107 J of work when supplied 8.9 × 107 J. What is its efficiency?

A: The efficiency be given as, Where, W be defined as work. Q be defined as the heat supplied.

Q: Supposed that you eat Skyflakes Cracker having a food calorific value of 120kcal and 18% of this…

A:

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 block (4 kg) starts from rest and slides down a frictionless ramp #1 of height 7 m. The block then…

A:

Q: A gasoline engine has a power output of 180 kW. Its thermal efficiency is 0.28. How much heat must…

A: Write the given values with suitable variables. Pout=180 kWη=0.28 Here, Pout denotes the output…

Q: In moving out of a dormitory at the end of the semester, a student does 1.82 x 104 J of work. In the…

A: Given Work done, W=1.82×104J Internal energy, ∆U=4.07×104J