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A skateboarder starts up a 1.0--high, 30 ramp at a speed of 5.1 . The skateboard wheels roll without friction. How far from the end of the ramp does the skateboarder touch down?
The windings of a motor have a resistance of 4.0 O. The counter emf of this motor when connected to a 120-V line and running at full speed is 104 V. What is the start up current of this motor
In Europe, a large circular walking track with a diameter of 0.900 km is marked in angular distances in radians. How many radians should he walk per day to maintain his daily routine
As an electron moves through a region of space, its speed decreases from 6.40 106 m/s to 2.20 106 m/s. Did the electron move to a higher potential or a lower potential
question the diameter of the moon is 2260 mi. and its distance from the earth is 230000 mi. find the diameter of the
What is the terminal speed for a 76.0 skier going down a 41.0 snow-covered slope on wooden skis = 0.070? Suppose that the skier is 1.80 m tall and 0.500 m wide. Replace mg with net forces parallel to the incline.
two 10 cm-diameter charged disks face each other 29cm apart. the left disk is charged to - 50 nc and the right disk is
The tires of a car make 62 revolutions as the car reduces its speed uniformly from 90km/h to 40km/h . The tires have a diameter of 0.86m. What was the angular acceleration of the tires
a particle is projected with a velocity of 900ft/sec at anelevation of 60 degrees to the horizontal from the foot of a planeof inclination 30 degrees, estimate the range on the inclined plane
If the car is moving at 30 m/s at the bottom of the dip, its mass is 800 kg, and the radius of curvature for the dip is 20 m, what is the normal force acting on the car in the dip
You measure an electric field of 1.26×106 N/C at a distance of 0.149 m. from a point charge. find the magnitude of the charge
Three point charges are located in the x-y plane. q1 = +78.2 nC at (0.0, -4.6 cm), q2 = -36.4 nC at (+5.8 cm, 0.0) and q3 = +77.4 nC at (-6.2 cm, +8.4 cm). Determine the magnitude of the net electric field at the origin
Eight books, each 4.9 cm thick with mass 1.2 kg, lie flat on a table. How much work is required to stack them one on top of another.
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