Question

2) The Oasis of the Seas has a mass of 10° kg and is floating tionless in the ocean. You are standing on its rear deck. You take a 0.15 kq baseball out of your pocket and throw it from the rear deck. away from the ship with a velocity of 30 m/s (about 60 mph) at an angle of20° above the horizontal. 10 pts) How fast does the Oasis move (horizontally) and in what direction? Do not consider any vertical motion of the Oasis caused by your throw mo Om -10 了0 nlede 3) A circular saw blade accelerates from rest with constant angular acceleration of 100 rad/s for 8-s, at which time a point on the edge of the saw blade is moving with speed 400-m/s a 3 pts) What is the angular speed of the saw blade after 8-s? 100 A At &100 A At b- 3 pts) Through what angle has the saw blade turned during the 8-s? 3 0 c - 4 pts) What is the radius of the saw blade? 5) A machine part consists of a thin, uniform 4.00 kg bar that i long, hinged perpendicular to a similar vertical bar of mas 0 kg and The longer bar has a small but dense 2.00 kg Dall at one end (see the figure). Figure E8.55 Hinge 4.00 kg ,00 kg.80m 2.00kg a - 5 pts) Draw your chosen coordinate axis on the diagram, and calculate the center of mass of the machine part in this coordinate system 5 a 3 1.50 Yen.em b-5 pts) If the vertical bar is pivoted counterclockwise through 90° to make the entire part horizontal, what is the new center of mass in your chosen coordinate system? 1) On a horizontal surface, a crate with mass 40.0 kg is placed against a spring that stores 260) of energy. The spring is released, and the crate slides 5.60 m before coming to rest (due to friction). Assume that the friction only begins once the mass has left contact with the spring a -5 pts) What is the speed of the crate just after it leaves the spring? b - 5 pts) What is the coefficient of friction of between the crate and the surface? c-5 pts) What is the speed of the crate when it is 2.50 m from the end of the spring?

Answer 1

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