An ice puck of mass m revolves on an icy surface in a circle at speed v at the end of a horizontal string of length l. the tension in the string is t. what is the mass of the puck if the length of the string is 2 m, the string tension is 10 n, and the tangential speed of the puck is 2 m/s.

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 .