Please help with the below physics problems.

NOTE: The answers with an "x" next to them in the system are INCORRECT. The check mark means the answer was CORRECT.

Thank you very much in advance!

Please help with part A and B (C is correct):

Using the definition of the scalar product, find the angle between the following vectors. (Find the smallest angle.) (a) A = 41 - 9j and B = 91 - 3j O X The correct answer is not zero. . (b) A = -81 + 9j and B = 31 - 4j + 2k 152.3 X Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. (c) A = 1 -2j + 2k and B = 3j + 4k 82.3 Need Help? Read ItA shopper in a supermarket pushes a cart with a force of 26 N directed at an angle of 250 below the horizontal. The force is just sufficient to balance various friction forces, so the cart moves at constant speed. (a) Find the work done by the shopper on the cart as she moves down a 45.0-m-long aisle. 1060.38011