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An efficient parcel service wants to speed up its deliveries by dropping parcel into moving tracks. An employee is positioned on the overpass directly above a straight level road to drop the parcels into the trucks at just the right time. One day a delivery van starts from the rest and drive along the road with the fix acceleration of 1/2g. A parcel is released at the accurate instant to land in the van. If the overpass was 30 meter above the van and the van started from the position 100 meter from the point of impact, find how long after the track started did the worker wait before dropping the parcel?
two 18.5 kg ice sleds that are placed a short distance apart, one directly behind the other. What are the final speeds of the two sleds
A top spins at 28 rev/s about an axis that makes an angle of 33° with the vertical. The mass of the top is 0.44 kg, What is the precession rate
a board lies on top of 2 uniform cylinders that lie on a fixed plane inclined at an angle theta. the board has mass m
A charge of 80nC is uniformly distributed along the x axis from x = 0 to x = 2.0 m. Determine the magnitude of the electric field at a point on the x axis with x= 8.0m
A standing wave on a tight string experiment is set up in thelaboratory. One end of the string is attached to an oscillatorthat vibrates with a frequency of 60 Hz. What is the wavelength of the standing wave
A 2.00-kg mass object traveling east at 20.0 m/s collides with a 3.00-kg mass object traveling west at 10.0 m/s. How much kinetic energy was lost during the collision
a d-cell flashlight has an emf of 1.50v an internal resistance of 0.12 ohms and a load provided by the resistor r if
a ray of light moving along the vector -i-2j undergoes refraction at an interface of two media which is the x-z
A child and sled with a combined mass of 57.0 kg slide down a frictionless slope. what is the height of the hill
A skier starts from rest at the top of a hill that is inclined at 10.9° with respect to the horizontal. How far does the skier glide along the horizontal portion of the snow
A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 88.8 m/s2 for 1.58 seconds, at which point its fuel abruptly runs out.
In order to study the long-term effects of weightlessness, astronauts in space must be weighed (or at least "massed"). Find the mass of the astronaut
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