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A water droplet with a mass of 22.3 ng (1 ng = 1 nanogram = 1E-9 g) is stationary in the air under the combined influence of gravity and a downward-pointing 12.4 kN/C electric field (1 kN = 1 kilonewton = 1E3 N). How many excess electrons must the water droplet have in order for the electric field to suspend it against gravity? ("Excess" electrons are those beyond the number needed for the droplet to be charge neutral.)
a 12 kg ball is dropped from rest at a point 5m above the floor and bounces back with a speed of 6 ms. what impulse is
You have been visiting a distant planet. Your measurements have determined that the planet's mass is two times that of earth but the free-fall acceleration at the surface is only one-fourth as large. What is the planet's radius
q1. in a skating stunt called as cracking-the-whip a number of skaters hold hands and form a straight line. they try to
Runner A is initially 1.0 mi west of a flagpole and is running with a constant velocity of 8.0 mi/h due east. How far are the runners from the flagpole when they meet
You have two identical lenses, each with a focal length of 16 cm, and you have a 13 mm tall object which you would like to image. Where will the final image be located and what is its height
It is currently popular for automobiles to use 10% ethanol / 90%gasoline mixtures (‘gasohol’) as fuel. According topopular consensus the main benefit of gasohol use is that it“reduces our dependence upon foreign oil.” Test thisassertion by making ..
q1. a curve of radius 40 m is banked for a design speed of 100 kmh. if the coefficient of static friction is 0.30 wet
The plates of a parallel-plate capacitor are charged to a potential difference of 12.0 V. If the capacitance is 15.0 µF, calculate the energy stored in the capacitor
Explain, using thermodynamically sound principles, what each of the following temperatures represents:
A projectile of mass m is fired from the ground with an initial speed vi at an angle of q above the horizontal. At the highest point of its arc, it explodes into three pieces, A, B and C, all of equal mass. Immediately after the explosion, pieces A a..
A van der waals gas undergoes an isothermal expansion from specific volume V1 to specific volume V2, Calculate the change in the specific Helmholtz function
A cart with mass 230 g moving on a frictionless linear air track at an initial speed of 1.7 m/s undergoes an elastic collision with an initially stationary cart of unknown mass, What is the speed of the two-cart center of mass
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