1. [-/2 Points] DETAILS SERPSE10 7.2.0P.OO1. 0/6 Submissions Used MY NOTES ASK YOUR TEACHER A raindrop of mass 3.39 X 10'5 kg falls vertically at constant speed under the influence of gravity and air resistance. Model the drop as a particle. (a) As it falls 85 m, what is the work done on the raindrop by the gravitational force? :11 (b) What is the work done on the raindrop by air resistance? :1] Need Help? I | 2. [-14 Points] DETAILS SERPSE10 7.2.0P.OO3. 0/6 Submissions Used MY NOTES ASK YOUR TEACHER A man pushes a m = 3.40 kg block a distance d = 2.40 m along the floor by a constant force of magnitude F = 16.0 N directed at an angle 9 = 27.0 below the horizontal as shown in the figure. Assume the oor is frictionless. (Enter your answers in joules.) F' his L7,,44 (D (a) Determine the work done on the block by the applied force (the force on the block exerted by the man). J H (b) Determine the work done on the block by the normal force exerted by the floor. J H (c) Determine the work done on the block by the gravitational force. J H (d) Determine the work done by the net force on the block. H J Need Help? mun 3. [-/3 Points] DETAILS SERPSE10 7.2.P.001. 0/6 Submissions Used MY NOTES ASK YOUR TEACHER A shopper in a supermarket pushes a cart with a force of 47.0 N directed at an angle of 25.0 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 48.0-m-long aisle. J (b) The shopper goes down the next aisle, pushing horizontally and maintaining the same speed as before. If the work done by frictional forces doesn't change, would the shopper's applied force be larger, smaller, or the same O larger O smaller the same (c) What about the work done on the cart by the shopper? O The work is larger in part (a). The work is larger in part (b). The work is the same in both parts. Need Help? Read It 4. [-/1 Points] DETAILS SERPSE10 7.3.OP.005. 0/6 Submissions Used MY NOTES ASK YOUR TEACHER For A= 31 + 4j - 4k, B = -31 + 4j + k, and C = 5j - 5k, find C . (A - B). Need Help? Read it Watch It 5. [-/2 Points] DETAILS SERPSE10 7.3.OP.006.MI. 0/6 Submissions Used MY NOTES ASK YOUR TEACHER A force F = (8 1 - 3 j) N acts on a particle that undergoes a displacement Ar = (2 i + ;) m. (a) Find the work done by the force on the particle. (b) What is the angle between F and Ar? Need Help? Read It Master It6. [-/1 Points] DETAILS SERPSE10 7.3.P.007. 0/6 Submissions Used MY NOTES ASK YOUR TEACHER Find the scalar product of the vectors in the figure below, where 0 = 1180 and F = 33.5 N. A 1320 F 17.3 cm Need Help? Read It 7. [-/3 Points] DETAILS SERPSE10 7.3.P.008. 0/6 Submissions Used MY NOTES ASK YOUR TEACHER Using the definition of the scalar product, find the angle between the following vectors. (Find the smallest nonnegative angle.) (a) A = 21 - 3j and B = 91 - 6j b) A = -31 + 6j and B = 31 - 43 + 2k (c) A = 1-23 + 2k and B = 3j + 4k Need Help? Read It