Question

There is finally peace between the robots and the remaining humans of Earth. To celebrate that

peace, the Midland Warriors Women’s Hockey Team is playing against the Bad Robot Consolidated

Hyper-Conglomerate. Being unfairly powered by plutonium core generators and multi-core AI, the robots win the face-off by having their player power hit the puck between all other players toward the Warriors’ goal on frictionless ice.

(a) Is the work done on the robot’s stick by the puck positive, negative, or zero?

(b) Suppose the robot hits the 160 g puck with 28.2 kW of power over the course of

9.00 ms. How much work is done on the puck?

(c) The puck is hit in a straight line toward the net with a velocity of 150 mph. With

what force did the robot hit the puck?

Answer 1

puck is opposite a) when puck is hit by stick so force on stick by to displacement, So work done by puck on stick is Negative. b) m = 0.160kg 3 P- 28.2 kW = 28.2 x 10 W So work-done = pt = 28.2x10² x 9x03 = 253.8 sone Ans © V = 150 m/hr = 150% 1.67x1000 m/s = 6701 m/s 3600 0.16X6701 - O mv-mr, = 1193 N. Now Pane Ans ane 9x103