A7150-kg railroad car travels alone on a level frictionless track with a constant speed of a 3350-kg load, initially at rest, is dropped onto the car. what will be the car's new speed? the positive direction is the direction of the original motion of the car.

Which type of wave can travel without a medium

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?

7types of electromagnetic waves from lowest to highest frequency