Why is “soft” iron used for the core of an electromagnet? It is difficult to magnetize.

It has no magnetic domains.

It is a permanent magnet.

It is easily magnetized.

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Which is not an example of how an object gains elastic potential energy by stretching? a. jumping on a pogo stick b. pulling on a rubber band c. jumping on a trampoline

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 .