Question

Please help me with the following questions:

1) Superman must stop a 115-km/h train in 150 m to keep it from hitting a stalled car on the tracks. The train's mass is 3.6 × 10⁵ kg.

Part A:

Determine the force that must be exerted on the train.

Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is in the direction opposite to the initial velocity.

Part B:

Compare the magnitudes of the force exerted on the train and the weight of the train (give as %).

Express your answer using two significant figures.

Part C:

How much force does the train exert on Superman?

Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is in the direction opposite to the initial velocity.

2) A 29.0-kg box is released on a 28 ∘ incline and accelerates down the incline at 0.26 m/s2 .

Part A:

Find the friction force impeding its motion.

Express your answer to two significant figures and include the appropriate units.

Part B:

Determine the coefficient of kinetic friction.

Express your answer using two significant figures.

Answer 1

Alright Dude, If that worked for you... dont forget to give THUMBS UP.(that will work for me!)

If I missed something feel free to leave a comment.
atleast before giving downvote.

Answer 2

To record this period’s depreciation expense