The six equations below tell us the position in meters as a function of time in seconds for six objects that are moving along a straight line. as the equations show, these objects vary in their initial positions, initial velocities, and accelerations. (a) x(t) = β7 + 9t β 2t2 (b) x(t) = +4 + 9t + t2 (c) x(t) = +3 - 7t - 2t2 (d) x(t) = -4 + 3t - 4t2 (e) x(t) = -1 - 9t - 2t2 (f) x(t) = -7 + t + 2t2
a) which of these objects have a net force acting on them? b) rank the objects based on the magnitude of the net force on them.
Answers: 3
Physics, 22.06.2019 12:20
Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earthβs electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earthβs electric field a feasible means of flight? why or why not?
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Physics, 22.06.2019 15:00
Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive
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Physics, 22.06.2019 15:20
Abag of potato chips contains 2.00 l of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0 deg c. what will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00 deg c and atmospheric pressure is 70.0 kpa? assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air.
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Physics, 22.06.2019 18:30
Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to Β±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?
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The six equations below tell us the position in meters as a function of time in seconds for six obje...
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