For vectors B⃗ =−iˆ−4jˆ and A⃗ =−3iˆ−2jˆ, calculate (a) A⃗ +B⃗ and its magnitude and direction angle, and (b) A⃗ −B⃗ and its magnitude and direction angle.

Aperson walking 1 mile everyday for exercise, leaving her front porch at 9: 00 am and returning to her front porch at 9: 25 am. what is the total displacement of her daily walk? a) 1 mileb) 0c) 25 minutes d) none of the above

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

Each neuron shown in this figure innervates a group of muscle fibers. what is the term for a group of muscle fibers innervated by a single neuron?