Which of the following does not use electromagnetic radiation? (check all that apply)
microwave ovens
radios
refrigeration unit
plasma

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).

Your friend increases her force on the desk by 30n . she doesn't change the direction of her push . what happens to the net force on the desk .will the desk accelerate