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a) Describe the energy transformations that take place when askier starts skiing down a hill, but after a time is brought torest by striking a tree.b) Why is it easier to climb a steep mountain via a zigzagtrail (switchbacks) than to climb straight up?c) How can a rocket change direction when it is far out inspace and is essentially in a vacum?
Two protons are released from rest, one from location 1 and another from location 2. When these two protons reach location 3,, what is the electric potential at location 3
A 5.0 V battery storing 43.0 kJ of energy supplies 1.5 A of current to a circuit. How much energy does the battery have left after powering the circuit for 1.0 hour
A submarine dives to a depth of 310 feet in the ocean. What is the gauge pressure at this depth? How many atmospheres is this
Show that the total charge contained in the charge distribution is Q. Show that the electric field in the region r = R is identical to that produced by a point charge Q at r = 0.
as a helicopter carrying a crate takes off its vertical position as well as the crates is given as yt at3 where a is a
The planet Neptune is 4.17×1012 from the Earth. Its diameter is 5.02×107 m. What diameter telescope objective would be necessary to just barely see Neptune as a disk rather
A barge on the Ohio river is 35 ft wide and 200 ft long with walls which are 12 ft high. One day you see it going up river empty and 10.5 ft of the barge is above water. What is the mass of the barge
A 72 kg meteorite buries itself 5.0 m into soft mud. The force between the meteorite and the mud is given by , What was the speed of the meteorite
A panicular spring has a spring constant of 86 N/m and a mass of 0.548 kg at its end. When the spring is driven in a viscous medium, the resonant motion occurs at an angular frequency of 12.2 rad/s.
a 2.1mm -diameter glass bead is positively charged. the potential difference between a point 2.5mm from the bead and a
a 1210-kg car and a 2240-kg pickup truck approach a curve on the expressway that has a radius of 281m. for the angle i
A helicopter 8.20m above the ground and descending at 4.40m/s drops a package from rest (relative to the helicopter). find the velocity of the package relative to the helicopter
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