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The Gravitron single-car roller coaster consists of a singleloop-the-loop. The car is initially pushed, giving it just theright mechanical energy so the riders on the coaster will feel"weightless" when they pass through the top of the circular arc. How heavy will they feel when they pass through the bottom of thearc (that is, what is the normal force pressing up on them whenthey are at the bottom of the loop)? Express the answer as amultiple of mg (their actual weight). Assume any effectsof friction or of air resistance are negligible.
Suppose Fuzzy, a quantum-mechanical duck, lives in a world in which h = 2?J · s. Fuzzy has a mass of 1.80 kg and is initially known to be within a pond 1.00 m wide. What is the minimum uncertainty in the duck's speed
Certain fish, such as the Nile fish (Gnathonemus), concentrate charges in their head and tail, thereby producing an electric field in the water around them. find the strength of the magnetic field at the receptor cells
As a bowling ball of radius 14.0 cm rolls down the alley to the right, a frictional force of magnitude 1.22 N, Find the frictional torque with respect to an axis through the center of the ball
what is the magnitue of the magnetic field in the centre of a solenoid with a current of 1.25 A, Describe the right hand rule for solenoids
You lay a mirror flat on the floor with one edge against a wall and aim a laser at the mirror. Find the angle of incidence of the laser ray on the mirror
a bat can detect small objects such as an insect whose size is approximately equal to one wavelength of the sound the
A particular engine has a power output of 6.00 kW and an efficiency of 22.0%. Assume the engine expels 6500 J of energy in each cycle. Find the time required to complete each cycle
A 5000 kg truck moving right at 20 m/s collides and sticks to a 2000 kg car moving left at 10 m/s. If momentum is conserved, then what is the velocity after the collision
A cylindrically shaped piece of collagen is being stretched by a force that increases from 0 to 3.0 x 10^-2 N. How much work is done by the variable force that stretches the collagen
A falling skydiver has a mass of 109 kg. What is the magnitude of the skydiver's acceleration
A 2kg ball is rolling East (without slipping) down a hill that makes an angle of 30° with the horizontal. find the net acceleration at the instant the ball is kicked
A parachutist jumps out of an airplane and acceleratea with gravity to a maximum velocity of 58.8 m/s in 6.o seconds, From what height did the parachutist jump?
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