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a boy on a roof throws one ball downward and an identical ball upward. the ball thrown downward hits the ground with 100 J of kinetic energy. if both balls are thrown at the same speed and there is no air friction, what is the kinetic energy of the second just before it hits the ground?
A stunt pilot performs a circular dive of radius 715m. At the bottom of the dive pilot has a speed of 265 m/s which at that instant is increasing at a rate of 15 m/s2(along the direction of vector B) What total acceleration does the pilot have at ..
q1. an emf is induced in a conducting loop of wire 1.22 m long as its shape is changed from square to circular.
An object is oscilliating on a spring with a period of 4.60 s . At time t= 0.00 s the object has zero speed and is at x = 8.30 cm
A 1.25 meter long wire has a mass of 150 grams. The wire is stretched with a force of 2 Newtons. What is the velocity of a wave over the wire
A rigid vessel contains ammonia as liquid and vapor in equilibrium at 8 bar with a quality of 0.02. The mass of liquid ammonia is 1000 kg. How much volume does the liquid ammonia occupy
An airplane is flying in a horizontal circle at a speed of 133.3 m/s. Banked for this turn, What is the radius of the circle in which the plane is flying
A motorcycle and a police car are moving in the same direction, with the motorcycle in the lead. What frequency does the motorcyclist hear in this case
A potential difference of 14.0 V is applied across a wire of cross-sectional area 5.01 mm2 and length 745 km. What type of wire is this
assume the current in the coaxial cable, see the figure , is not uniformly distributed, but instead the current density varies linearly with distance from the center: for the inner conductor and for the outer conductor. Each conductor still carrie..
A car moving at 25m/s approaches a stationary whistle that emits a 350Hz sound. The speed of sound in the air is 343m/s, find the frequency of sound heard by the driver of the car
A Carnot engine has an efficiency of 0.325, and the temperature of its cold reservoir is 414 K. what amount of heat is put into the engine
A child on a boat throws a 5.40 kg package out horizontally with a speed of 12.0 m/s. determine the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.5 kg and the mass of boat is 55.5 kg.
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