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someone at a fifth-floor window 20 m above the ground hurls a ball downward at 400deg at a speed of 140 msa how long
in denver children bring their old jack-o-lanterns to the top of a tower and compete for accuracy in hitting a target
a swimming pool has dimensions 360 m 80 m and a flat bottom when the pool is filled to a depth of 190 m with fresh
a projectile is launched into the air with an initial speed of vi at a launch angle of 30 degrees above the horizontal
an induction roller coaster can accelerate a train from zero to 27ms in 25 seconds what is the average force exerted on
a pulley system lifts a 500 lb bloch 2 feet with an effort of 50 lbs if the 50 lbs moves 30 feet what is the efficiency
a hike walks 45km in one direction then makes a 45 degree turn to the right and walks another 64km what is the
a cube of wood floating in water supports a 200g mass at the centre of its top face when the mass is removed the cube
a test charge of 3x10-7 c is located 5cm to the right of a charge of -4x10-6 c and 10 cm to the left of a charge of
a segment of wire of total length 2m is formed into a circular loop having 5 turns if the wire carries a 12a current
a reinforced concrete column 400mm by 400mm and 35m high is subjected to a load 160kn the column shortens by 007mma
a 700 n window washer is standing on a uniform scaffold supported by a vertical rope at each end the scaffold weighs
kevin is riding his motorcycle at a speed of 13msif the diameter of the rear wheel is 65 cm what is the angular speed
shawn and his bike have a total mass of 588kg shawn rides his bike 11km in 123 min at a constant velocity what is
a cork 20 cm in radius is used to close one end of a tube whose other end is connected to a vacuum pump the pump
a rod pushes with a force of 23n on a cable that holds an 84n sign if the cable is at 36 degrees to the building what
a narrow plastic pipe is almost completely supmerged in a graduated cylinder full of water and a turning fork is held
a 21x103 kg car starts from rest at the top of a driveway that is sloped at an angle of 200 degrees with the horizontal
aamp160mechanic jacks up the front of a car to an angle of 80 degrees with the horizontal in order to change the front
in the bohr model as it is known today the electron is imagined to move in a circular orbit about a stationary proton
a hockey puck struck by a hockey stick is given an initial speed of 10 ms if the coefficient of kinetic friction
runner a is initially 86 km west of a flagpole and is running with a constant velocity of 52 kmh due east runner b is
a if the jet is moving at a speed of 1600 kmh at the lowest point of the loop determine the minimum radius of the
a roller coaster having a total mass including passengers of 500 kg travels freely along a winding frictionless track
a ball is thrown 200 ms at an angle of 400ordm with the horizontal assume the ball is thrown at ground levela how long