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A railroad diesel engine coasting at 10 Kmh runs into a stationary flatcar The diesel weighs four times as much as the flatcar. How fast do the cars move when they stick together upon collision?
There are no forces external to the engine and car involved here*, thus this is a case of conservation of momentum. Note, an unknown amount of energy is absorbed by the couplers and other parts of the engine and car, so the conservation of energy equation is not useful here. Momentum = velocity X mass Since momentum is conserved, the total velocity X mass before the collision will equal total velocity X mass after the collision. If we define the mass of the car as M, then the mass of the engine is 4M Let: the initial velocity of the engine = Ve1 = 10Kmh the initial velocity of the car = Vc1 = 0 Kmh the final velocity = V2 (it is the same for both the car and the engine) So the initial momentum is: (Ve1) (4M) + (Vc1) (M) = (10) (4M) + (0) (M) = 40M The final momentum is: (V2) (4M + M) = (V2) (5M) = 5V2M Setting the initial momentum equal to the final momentum gives: 40M = 5V2M Doing the algebra gives: 40 = 5V2 8 = V2 So, the answer is the final velocity is 8 Kmh *We are assuming friction of the wheels on the track is negligible and that the track is level so that gravity can be ignored.
The angular speed of an automobile engine is increased from 1600 rev min to 3000 rev min in 12 s what is its angular acceleration assuming it to be uniform?
The angular acceleration is 1.944... (repeating) rev per second^2.
Will two cars of different engine capacities maintain the same momentum if driving at the same speed?
No, the momentum of the cars would not be the same. Momentum is proportional to both mass and velocity, so if two cars are moving at the same speed but have different engine capacities (implying different masses), then their momenta will also be different.
When gasoline is burned in engine is mass lost?
No, because of the law of conservation of mass.
What additives give rocket engines forward momentum?
Chemical rockets combine a fuel chemical and an oxidizer chemical to produce combustion products (a new, combined chemical with an ever-so-slightly lower mass than the components, and lots of energy). In the space shuttle main engine (SSME) the fuel was liquid hydrogen (other common liquid fuels are alcohol and kerosene) and the oxidizer was liquid oxygen. The rocket engine is a bell with an open end, or nozzle. When the hydrogen and oxygen are combined in the bell, they burn to produce water vapor and energy. The released energy forces the mass of the water vapor out the open end of the engine in one direction and, by conservation of momentum (Newton's third law), the mass of the rocket is propelled in the opposite direction. So, rather than a specific additive, everything that is burned in the engine provides mass that contributes to the momentum that propels the rocket.
A device powered either by a piston engine and prop or by a jet engine?
Airplane is a device powered either by a piston engine and prop or by a jet engine.
A jet engine works under the principle of?
A jet engine works under the principle of force versus thrust.
What would be the momentum of the passenger bus its velocity were doubled?
a) doubled b) tripled c) doubled (assuming the engine is used to bring it back to the same speed) d) quadrupled e) halved
What would be the momentum of a passenger bus if its velocity were doubled?
a) doubled b) tripled c) doubled (assuming the engine is used to bring it back to the same speed) d) quadrupled e) halved
What is gross thrust in a turbine engine verses net thrust?
Hi there, Gross thrust is the reaction of the momentum of the jet stream produced in a gas turbine engine.If you don't know net thrust,let me tell you.Net thrust is the resultant force acting on the aircraft.Net thrust=Gross thrust-Momentum(Intake)Drag.Don't go deep in momentum drag.When the aircraft with turbine engine,is moving...Gross Thrust is more than net thrust.and when the engine is at the rest,gross thrust=net thrust.Hope you got the answer.....Good luck in your future. Hi there, Gross thrust is the reaction of the momentum of the jet stream produced in a gas turbine engine.If you don't know net thrust,let me tell you.Net thrust is the resultant force acting on the aircraft.Net thrust=Gross thrust-Momentum(Intake)Drag.Don't go deep in momentum drag.When the aircraft with turbine engine,is moving...Gross Thrust is more than net thrust.and when the engine is at the rest,gross thrust=net thrust.Hope you got the answer.....Good luck in your future. Gross thrust, means the thrust when there is not forward momentum of the jet. However, the jet has always the forward speed. When we consider this, we can calculate the net thrust as the gross thrust minus the forward momentum.
Why does a car jerk when accelerating?
Something to do with the transmission. Probably slipping It's the force of momentum being exerted on the car, the chassis of the car doesn't quite "catch up" with the engine itself without a transfer of momentum, or "jerk".
Why does a real car have more momentum then a toy car?
A real car weighs more and can move on a high powered engine.
