An electron, moving in a uniform magnetic field, moves in a circle path perpendicular to the field lines and takes time 2t for each circle. if the electron's speed is tripled, what would now be its new period in terms of t?

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 .