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A person throws a discus (mass = 2 kg) at an angle of 40o to the horizontal with a velocity of 20 m/s. Neglect air resistance for these questions.
a) What is the mechanical energy of the discus at release (relativeto the ground) and just prior to contact with the ground (assume no rotational energy)?
b) Calculate the distance the object travelled horizontally priorto ground contact if the discus was released 1.5 m above the ground.
c) Are these reasonable calculations to make (i.e. are the answersto part a and b going to be some what accurate)?
A 5-kg object moving with a velocity of 4m/s colides head on with a 10-kg object moving towards it at -3m/s. If the 10-kg object stops dead after the collision, what is the approximate coefficient of restitution for this collision
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The combination of an applied force and a friction force produces a constant total torque of 35.2 N · m on a wheel rotating about a fixed axis. The applied force acts for 6.10 s. During this time, the angular speed of the wheel increases from 0 to..
A homemade electroscope has 2 pieces of straw hanging from 2strings dangling from a hook. The length of the string fromtop to bottom on one side is 8 cm. When charged, the strawsstay 2 cm apart. The mass of one of the straws is .08 grams.
tom twirls a ball of 0.15 kg on a string in a horizontal circle of radius 0.4 m. the ball travels once around the
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