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A boy throws directly downward an ideally elastic ball from theheight 4.80m. The ball is being bounced from the floor reaching certain (unknown) height. Ignore air resistance:
a) If the initial speed of the ball is 4.4m/s, what is the speed when it hits the floor?
b) What initial speed should the ball have in order to bounce to thelevel of 6.40m above the ground?
The tires of a car make 69 revolutions as the car reduces its speed uniformly from 92km/h to 40km/h . The tires have a diameter of 0.80m. What was the angular acceleration of the tires
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a transition in a nucleus consists of changing a three-quarks group uud to a udd collection. this transition is
A 2.40 bucket containing 11.5 of water is hanging from a vertical ideal spring of force constant 115 and oscillating up, What is the shortest period this system can have
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A 20-m long steel wire (cross-section 1.0 cm2, Young's modulus 2.0 ´ 1011 N/m2), is subjected to a load of 25 000 N. How much will the wire stretch under the load
A cube of mass m = 7.55 kg is placed on an inclined plane of mass M = 12.67 kg, which makes an angle a = 52.40° with the horizontal. What is the normal force on the inclined plane from the table underneath it
A 28-g rifle bullet traveling 230 m/s buries itself in a 3.6-kg pendulum hanging on a 2.8-m-long string, find horizontal components of the pendulum's displacement
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