A railroad diesel engine weighs four times as much as a freight car.  If the diesel engine coasts at 4.0 km/h into a freight car that is intitally at rest, find the speed of the coupled cars. Express you answer to two significant figures and include appropriate units.

Q: A car advertisement claims that its 900-kg car accelerated from rest to 30.0 m/s and drove 100 km,…

A: Given: Mass of the car=900 kg Friction force=700 N Distance=100 km Altitude=3 km=3000 m

Q: The force exerted on a car by a prototype crash barrier as the barrier crushes is F = − (120s +…

A:

Q: A block of ice is released at the top of a 30 degree inclined 10 meter above the ground. If the…

A:

Q: A car's bumper is designed to withstand a 3.60 km/h (1.0 m/s) collision with an immovable object…

A: Given data: The mass of car is m=820 kg. Initial speedo of car is u=1.0 m/s. Displacement of bumper…

Q: This and the next two questions apply to this situation: A massive space freighter wants to…

A:

Q: A girl and her bicycle have a total mass of 60 kg. At the top of the hill her speed is 5.0 m/s. The…

A:

Q: A single force F(x) = −8.0x (in newtons) acts on a 3.0-kg body. When x = 6.75 m, the speed of the…

A: Given, Force, Fx = -8xMassm = 3 kg , when x = 6.75 m  , v = 4 m/swhen x=2.5m , v = ?

Q: A 79.0-kg skier starts from rest from the top of a 50-m high slope. What is the speed of the skier…

A: Givenheight, h=50 mmass, m=79 kginitial speed, u=0we can use conservation of mechanical energy here…

Q: The top of a ski hill sits at an altitude of 2000 m. If you were to "Frenchfry" (go straight down…

A: Here, we have to Use Conservation of energy As difference in altitude is given, we just have to…

Q: An artillery shell is fired at a target 200 m above the ground. When the shell is 100 m in the air,…

A:

Q: My 25-kilogram garbage cart has a broken wheel. I pull it to the curb with a force of 200N, while…

A: Given data:  Mass (m) = 25 kg Force applied (F) = 200 N Frictional force (f) = 150 N Initial…

Helmholtz Free Energy

The Helmholtz free energy is a thermodynamic potential used to calculate the measure of useful work from a closed system. This system is kept at constant temperature and volume. German physicist Hermann Helmholtz introduced this concept in 1882.