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: If a rbus starts out at a height of 2 m moving at a velocity of 8 m/s, assuming no friction, what…

A: The kinematic equation for vertical motion is given by Where uy = Initial vertical velocity, vy =…

Q: If a Saturn V rocket with an Apollo spacecraft attached has a combined mass of 2.5 x 105 kg and…

A: Given data, Combined Mass of the Apollo Spacecraft (m)=2.5×105 kg Speed of the spacecraft(v)=10.4…

Q: (a) Use work and energy considerations to find the magnitude of the frictional force that stops the…

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Q: A cart which has a mass of 20 kilograms slides down a frictionless slope of a hill. If the cart…

A: Given data:  Mass (m) = 20 kg Initial velocity (Vi) = 0 m/s Final velocity (Vf) = 15 m/s…

Q: If the speed of a car is increased by 70%, by what factor will its minimum braking distance be…

A: Consider the speed of the car in the first case is v.

Q: What is the kinetic energy of a 30 kg object travelling at 20 m/s? O 12kJ O0.12 kJ O 120 kJ O 12 k

A: Part (1): Given: The mass of the object is 30 kg. The speed of the object is 20 m/s.

Q: A 5kg medicine ball is thrown upward at 8 m/s. When it is caught, a force is applied over a distance…

A: Given Data: The mass of the ball is: m=5 kg The velocity of the ball is: v=8 m/s The distance to…

Q: Ans. (i) 2000 J (ii) 1000 J 18. A truck weighing 1000 kgf changes its speed from 36 km h-¹ to 72 km…

A: Given data, Mass of the truck m = 1000 kg Initial velocity u=36 km/h=36×518=10 m/s Final velocity,…

Q: A roller coaster car has a massive 320 kg. Starting from the rest the car requires 3.5×10^5 joules…

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Q: A 14 kg penguin slides on its belly down an icy, frictionless glacier. If the penguin started from…

A: Write the given values of the problem- Mass=14 kg final speed(vf) vf=14 m/s

Q: During a water balloon fight at a college dormitory, a student drops a 0.80-kg water balloon from a…

A: Given data: m=0.8 kgv=14 m/s Need to determine the height of the window.

Q: A 70 kg skier 12m up a hill is traveling 9 m/s. Find how fast the skier will be traveling when she…

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Q: In 45 seconds, a 2.5-ton vehicle can reach 120 mph from rest. Exclude friction losses while…

A: Power is defined as the rate of doing work. It is calculated by dividing work done during a given…

Q: Jane holds an apple of mass m over the edge of a bridge of height h = 9m. She drops the apple and it…

A: CONCEPT: We know, From kinematic equation of motion,  v² = u²+2as.......(1) Where,    'v' is the…

Q: A world-class sprinter running a 100 m dash was clocked at 5.4 m/s 1.0 s after starting running and…

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Q: During terrible weather at a ski-flying world championship, a ski jumper tried to adjust for bad…

A: Given: The mass of the jumper is 73 kg. The distance from the starting point is 45 m. Introduction:…

Q: 8. A B-double truck of mass 45 tonnes is travelling at a uniform velocity of 100 km/h. The driver…

A: Given data:Mass of truck, m = 45 tonnes = 45 x 1000 kg = 45000 kg Initial velocity, u = 100 km/h =…

Q: In 45 seconds, a 2.5-ton vehicle can reach 120 mph from rest. Exclude friction losses while…

A: Solution:-Given thattime (t)=45 sInitially at restFinal speed (v)=120 mphmass of vehicle (m)=2.5 ton

Q: The dominant form of drag experienced by vehicles bikes, cars, planes, etc.) at operating speeds is…

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Q: A hammer held horizontally is allowed to swing down with the end of the handle held in place. The…

A: Given that : Weight of the hammer = 2 kg Ignoring the mass of the handle = 0.6 m After swinging down…

Q: How fast does a 48kg tiger running if it has a kinetic energy of 15 kilojoules? Express your answer…

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Q: Which system does more work: (a) ΔE = -643J, q = 400 J; or (b) ΔE = 713J, q = 437 J?

A: (a) ∆E = - 643 J  q = 400 J  (b)  ∆E = 713 J  q = 437 J

Q: Question 5.3a: The figure shows a 3.35-kg box being released from rest to slide down a frictionless…

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Q: 2. In the figure, a very small toy race car of mass m is released from rest on the loop-the-loop…

A: Let the angle made by the car with the vertical is θ. Applying Newton's second law,…

Q: (!) THE FOLLOWING QUESTIONS ARE BASED ON THE INFORMATION GIVEN BELOW. The lift of an observatory…

A: Force brings about motion and changes in motion. Object under free fall is subjected to gravity of…

Q: A 80 kg man runs up a a flight of stairs with a height of 10 meters in 10 seconds. calculate…

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Q: The driver of a passenger car puts the car to "rest" at the speed of 90 km/h, therefore, the car's…

A:

Q: If the speed of a car is increased by 95%, by what factor will its minimum braking distance be…

A: Consider the initial speed of the car is u.

Q: Superman stands majestically on top of a 250meter tall building with the wind whipping his cape.…

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Q: As a block of mass 7 kilograms drops from the edge of a 40-meter-high cliff it experiences a loss of…

A: Given: The mass of the block is 7 kg. The height of the cliff is 40 m. The loss of energy due to air…

Q: What is the kinetic energy of a 30 kg object travelling at 20 m/s? O 12 kJ O.12 kJ O 120 kJ O 12 kJ

A: Given data: Mass (m) = 30 kg Velocity (v) = 20 m/s Required: Kinetic energy (KE)

Q: A dog is running in the park. First, she runs 55 meters east, then 25 meters west, then 11 meters…

A: Given data:  First runs 55 meters, due East Then 25 meters, due west Then 11 meters due East…

Q: time of 7 seconds, a motorcycle can accelerate from rest to the speed v. Determine the amount of…

A:

Q: how fast would a 30 kg child be moving from top to bottom on a zipline starting at a height of 43.6…

A:

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.