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A roller coaster at an amusement part starts out an a level track 50.0 m long and then goes up a 25.0 m incline at an angle of 30 degrees to the horizontal. It then goes down a 15 m ramp with an incline of 40 degrees to the horizontal. when the roller coaster has reached the bottom of the ramp, what is its displacement from the starting point?
A proton with a speed of 3.0 x 105 m/s falls through a potential difference V and thereby increases its speed to 9.0 x 105 m/s. Through what potential difference did the proton fall
a ball of radius 20.0 cm rolls from rest dawn a ramp, how many revolutions does the ball make while it is in the air
A 3.0kg block is attached to a string that is wrapped around a 2.0kg , 4.0-cm-diameter hollow cylinder that is free to rotate. Use conservation of energy to find the speed of the block as it hits the ground
Two bicycle tires are set rolling with the same initial speed of 3.40m/s along a long, straight road, What is the coefficient of rolling friction r for the tire under low pressure
The kinetic friction force between surface and disk slows down its linear motion while at the same time making the disk spin on its axis at an accelerating rate. Finally, the disk's rotation catches up with its linear motion, and disk begins to roll ..
It takes the Earth 24 hours to make a complete rotation around its axis. What is the angular velocity of the Earth in rad/s
A 78-kg man standing on a scale in an elevator notes that as elevator rises, the scale reads 834 N. What is the acceleration of the elevator.
Soft drinks are commonly sold in aluminum containers. How many tons of aluminum does this represent
An elevator at the CN Tower in Toronto, Canada, is able to lift 2000 kg (including the load and the car) to a height of 350 m in 60.0 s. find the minimal power required for the motor of the elevator
A 2.0 cm x 2.0 cm parallel-plate capacitor has a 3.0 mm spacing.The electric field strength inside the capacitor is 1.1 x105 V/m. How much charge is on each plate
A runner with a weight of 686.7 N accelerates at a constant rate from 0 to 4.5 m/s in the first 2 seconds of a 100 m sprint. What is the net horizontal force
Two charged dust particles exert a force of 4.30×10-2 N on each other. What would be the force if they are moved so they are only one-sixth as far apart.
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