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gamerzgamerz
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please help me with these problems!
even if you only have time to do one, i'd really appreciate it!
A ball is thrown with an initial speed of 15 m/s at an angle of 53 degrees above the horizontal from the top of a 35 m building. if g = 9.8 m/s^2 and air resistance is negligible, then what is the magnitude of the horizontal components of velocity as the rock strikes the ground?
(the answer is 9.0 m/s, but i have no idea how to get to that.)
A 500-N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 10 degrees with the horizontal. what is the tension in the rope?
(answer: 1440 N, but i somehow got 2900 N)
a vault is opened by applying a force of 300 N perpendicular to the plane of the door, 0.80 m from the hinges. find the torque due to this force about an axis through the hinges.
(answer: 240 N*m)
even if you only have time to do one, i'd really appreciate it!
A ball is thrown with an initial speed of 15 m/s at an angle of 53 degrees above the horizontal from the top of a 35 m building. if g = 9.8 m/s^2 and air resistance is negligible, then what is the magnitude of the horizontal components of velocity as the rock strikes the ground?
(the answer is 9.0 m/s, but i have no idea how to get to that.)
A 500-N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 10 degrees with the horizontal. what is the tension in the rope?
(answer: 1440 N, but i somehow got 2900 N)
a vault is opened by applying a force of 300 N perpendicular to the plane of the door, 0.80 m from the hinges. find the torque due to this force about an axis through the hinges.
(answer: 240 N*m)