Aspaceship is 1600 m long when it is at rest. when it is traveling at a certain constant speed its length is measured by external observers and it is found to be 1390 m. what is the speed of the spaceship in terms of the speed of light? tries 0/20 in the kitchen of the spaceship the chef sets the oven timer for 1.95 hours to make roast beef. how much time does the roast beef spend in the oven when measured by external observers at rest?

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=