When you put on the brakes on your bicycle, friction heats the steel rims of your wheels. Could this heating be a problem? Suppose a 65 kg cyclist with a 15 kg bike is descending Trail Ridge Road in Rocky Mountain National Park, going down a 7.0% grade and thus losing 7.0 m in height for every 100 m oftravel along the road. If the cyclist keeps a constant speed of 6.0 m/s, and we assume that all of the “lost” energy ends up as thermal energy in the two steel rims, each of mass 0.80 kg, by how much does the temperature of each rim rise in 1.0 minute?

Q: a) Find the change in the mechanical energy (potential + kinetic) of the block from the top to the…

A:

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: A 12 gram bullet moves vertically upwards at a velocity of 950m/s and strikes a 2.00kg block which…

A: 1. By conservation of momentum, MBulletVBullet + MBlockVBlock = (MBullet+MBlock)V 0.012 x 950+2 x 0…

Q: A person's basal metabolic rate (BMR) is the rate at which energy is expended while resting in a…

A:

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 60-kg hiker wishes to climb to the summit of Mt. Ogden, an ascent of 5000 vertical feet (1500 m).…

A: ⇒   Given     Mass of hiker M = 60kg.     height og mountain h = 1500 m.

Q: An engineer claims to have measured the characteristics of a heat engine that takes in 100 J of…

A: The expression for the ratio of the temperatures is,

Q: From what height should be dumped a body with mass of 3 kg, so that the amount of heat given off,…

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: why does the change in internal energy decreases as the volume of ethanol increases? For 25ml…

A: As concentration increasing oxygen concentration in water is also increasing. More the  oxygen less…

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: 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 25 g ball is released from rest 80 m above the surface of Earth. During the fall the total…

A:

Q: A lump of plasticine weighing 200 g is thrown at an angle of 30° and at a speed of 16 m/s towards…

A:

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 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: The kinetic and potential energy of an object as it moves along the x axis is represented by the…

A: Given:  Energy vs distance graph is given:  From x = 0 m to x = 100 m, Work done on the object = 3…

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: Problem 12:  When water flows through river rapids or over a waterfall, it experiences a decrease in…

A: Height of waterfall (h) = 41 m  Specific heat of water (c) = 4.19 × 103 J / kg ° C

Q: A pronghorn antelope can run at a remarkable 18 m/s for up to 10 minutes, almost triple the speed…

A: Given data *The power required is Pr = 3.4 kW = 3.4 × 103 W *The efficiency of the pronghorn is η =…

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: 119. As a thrown baseball is acted on by air friction, the thermal energy of the ball (1) decreases…

A: Kinetic energy decreases over time as frictional force due to air acts on it.

Q: An iron plate is held against an iron wheel so that a sliding frictional force of 50. N acts between…

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: At Niagara Falls, if 505 kg of water falls a distance of 50.0 m, what is the increase in internal…

A: Given Information:- Mass of the water m=505 kg Height of the water falls is h=50.0 m   Required:-…

Q: 2. A firefighter decides to show off by sliding down the pole by their hands only without gloves.…

A: Part a: The potential energy changed during the fall is converted to kinetic energy and heat energy…

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

A:

Q: Supposed that you eat Skyflakes Cracker having a food calorific value of 120kcal and 22% of this…

A: Given  Food calorific value CV=120kcal=120×4184=502080J Useful work W=502080×0.22=110457.6 J Mass…

Q: When one gallon of gasoline is burned in a car engine, 1.19 x 108 J of internal energy is released.…

A: given, When one gallon of gasoline is burned in a car engine, 1.19 x 108 J of internal energy is…

Q: On a trip, you notice that a 4.64-kg bag of ice lasts an average of one day in your the average…

A: GivenMass of ice bag, m=4.64 kg

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

A:

Q: Suppose the car approches a hill and has the intial speed 106 km/h at the bottom of the hill. The…

A:

Q: You push a 33-kg table across a 6.2-m-wide room. In the process, 1.5 kJ of mechanical energy gets…

A: the expression for mechanical energy is

Q: A Carnot air conditioner takes energy from the thermal energy of a room at 70 F and transfers it as…

A: The temperature are given in Fahrenheit. Convert these temperatures into Kelvin.

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: The surface waters of tropical oceans are at a temperature of 27°C while water at a depth of 1200 m…

A:

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

A:

Q: mmh One ounce of a well-known breakfast cereal contains 110 Calories (1 food Calorie = 4186 J). If…

A: To determine: The weight of the bareball that could be lifted   Distance of the bareball lifted,…

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: Roughly how high could a 370 K copper ball lift itself if it could transform all of its thermal…

A: Equate thermal energy to mechanical work

Q: A block (2 kg) initially compresses spring #1 (k = 1000 N/m) by 60 cm from its equilibrium point.…

A: Given information: The mass of the block (m) = 2 kg spring constant of the first spring (k1) = 1000…

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.