Heat transfer from the roof of a rail car. the top surface of the passenger car of a train moving at a velocity of 95 km/h is 2.8 m wide and 8 m long. the top surface is absorbing solar radiation at a rate of 380 w/m2 and the ambient air temperature is 30°c. assuming the car roof to be perfectly insulated and the radiation heat exchange with the surroundings to be small relative to convection, determine the temperature of the top surface of the car. hint: treat the top surface as a flat plate in determining the film coefficient h. 37.1°c

Asap time is ! best answer gets compose at least one well-developed paragraph on the following: define the term concurrent powers, and give an example of a concurrent power of government.

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass