In a plane electromagnetic wave, the E and B fields are:
Group of answer choices:
a. perpendicular and 90 degrees out of phase
b. parallel and 90 degrees out of phase
c. perpendicular and in phase
d. parallel and in phase
e. perpendicular, can be any phase relative to one another
f. parallel, can be any phase relative to one another

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .