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Physics - Motion
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Gravity
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A river is 300m wide and flows from east to west at 8m/s. A ferry boat starts at the south bank, and is aimed north at a point P directly across the river. The boat motors at 15m/s in still water. Where will the boat reach the opposite bank?
160 m west of P
A car moving at 60km/h E enters a curve. When it leaves the curve, the velocity of the car is 60km/h W. What is the change in velocity of the car?
120 km/h W
To produce a max vertical jump an athlete should
use her hips, then knees, then ankles because of time constraints
Justine is paddling her kayak downstream at a velocity velocityJW relative to the water. The water is flowing at velocityWS relative to the shore. Which equation correctly relates the relative velocities among Justine, the water and the shore?
VelocityJS = VelocityJW + VelocityWS
A student rolls a marble across a table. At the instant that the marble leaves the edge, the student drops a second marble from the edge of the table.
The marbles have equal accelerations and both marbles will strike the floor at the same time
which statement applies to projectile motion
The horizontal component of the acceleration is zero
A rotating ride at an amusement park has a period of T. As the ride speeds up, at one point in time its period becomes 1/2T. How does the centripetal acceleration of rider change?
Increases by a factor of 4
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