, 21.06.2019 16:40 genesis88

Three point charges, two positive and one negative, each having a magnitude of 20 μc are placed at the vertices of an equilateral triangle (30 cm on a side). what is the magnitude of the electrostatic force on the negative charge

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Physics, 22.06.2019 07:30
Ihave a few questions ! 1. imagine that mrs. lynns' science class got a human cannon to use for physics experiments! mr. jin, our principal, has volunteered to try it first. if mr. jin has a mass of 90 kg, how much kinetic energy would he have if he flew through the air with a velocity of 20 m/s? 2. sarah is standing on the edge of the diving board. if the diving board is 3 meters above the pool, and erica has a mass of 25 kg, how much gravitational potential energy (gpe) does she have before jumping? 3. a 1-kg model airplane has 98 j of gravitational potential energy. what is the airplane’s height?
Physics, 22.06.2019 09:40
When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.
Physics, 22.06.2019 15:00
Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.