A freight train consists of two 8 .00 × 1 0 5 − kg engines and 45 cars with average masses of 5 .50 × 1 0 5 kg . (a) What force must each engine exert backward on the track to accelerate the train at a rate of 5 .00 × 1 0 -2 m/s 2 if the force of friction is 7 .50 × 1 0 5 N assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently, trains are very energy-efficient transportation systems. (b) What is the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?
A freight train consists of two 8 .00 × 1 0 5 − kg engines and 45 cars with average masses of 5 .50 × 1 0 5 kg . (a) What force must each engine exert backward on the track to accelerate the train at a rate of 5 .00 × 1 0 -2 m/s 2 if the force of friction is 7 .50 × 1 0 5 N assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently, trains are very energy-efficient transportation systems. (b) What is the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?
A freight train consists of two
8
.00
×
1
0
5
−
kg
engines and 45 cars with average masses of
5
.50
×
1
0
5
kg
. (a) What force must each engine exert backward on the track to accelerate the train at a rate of
5
.00
×
1
0
-2
m/s
2
if the force of friction is
7
.50
×
1
0
5
N
assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently, trains are very energy-efficient transportation systems. (b) What is the force in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?
Definition Definition Force that opposes motion when the surface of one item rubs against the surface of another. The unit of force of friction is same as the unit of force.
A freight train consists of two 8.00×104 kg engines and 45 cars with average masses of 5.60×104 kg.
(a) What force ( in N) must each engine exert backward on the track to accelerate the train at a rate of 4.00×10−2 m/s2 if the force of friction is 6.20×105 N, assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently trains are very energy-efficient transportation systems.
answer= N
(b) What is the force ( in N) in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines?
answer = N
Three forces acting on an object are given by F1 = (−1.5î + 7.45ĵ) N, F2 = (5.25î − 1.1ĵ) N, and F3 = (−42î) N. The object experiences an acceleration of magnitude 3.70 m/s2. (a) What is the direction of the acceleration? ° (counterclockwise from the x-axis). (b) What is the mass of the object? kg. (c) If the object is initially at rest, what is its speed after 18.0 s? m/s. (d) What are the velocity components of the object after 18.0 s?
A train locomotive pulls a train with a mass of 1.40 ✕ 107 kg on level rails. The locomotive exerts a constant force of 7.10 ✕ 105 N on the train. How much time does it take to increase the speed of the train from rest to 64.0 km/h? (Ignore any resistance force from the rails on the wheels of the train. Enter your answer in minutes.)
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