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2). An electron is released a short distance above Earth's surface. A second electron directly below it exerts an electrostatic force on the first electron just great enough to cancel the gravitational force on it. How far below the first electron is the second? The value of Coulomb's constant is 8.98755 × 10^9 N·m^2/C^2 and the acceleration of gravity is 9.81 m/s^2.
What is the kinetic energy of α particle while it reaches the other plate? The distance between the plates is 33 cm.
Calculate the potential energy stored in the bow, if the arrow of mass 5.50 10-2 kg leaves the bow with a speed of 45.0 m/s. Assume that mechanical energy is conserved.
The driver of a 1800 {rm kg} car travelling on a horizontal road at 100 {rm km}/{rm h} suddenly applies the brakes. Because of a slippery pavement, the friction of the road on the tires of the car, which is what slows down the car, is 20.0% of the..
A flea jumps straight up to a maximum height of 0.470 m. What is its initial velocity v_0 as it leaves the ground.
Laser light with a wavelength lambda = 660nm illuminates a pair of slits at normal incidence.
If it takes 3.60 x10-13 s for a nitrogen molecule to hit the wall and rebound with the same speed but moving in an opposite direction (assumed to be the negative direction), what is the average acceleration of the molecule for the period of this t..
A certain alarm clock ticks four times each second, with each tick representing half a period, What is the torsion constant of the coil spring and What is the moment of inertia of the balance wheel about its shaft
A 160 m wide river flows due east at a uniform speed of 4.05 m/s. A boat with a speed of 7.2 m/s relative to the water leaves the south bank pointed in a direction 39o west of north. What is (a) magnitude and (b) direction of the boat's velocity r..
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
If the range of discharge times that can be handled effectively is from 10.0 μ s to 6.00 ms, illustrate what should be the (a) lower value and (b) higher value of the resistance range of the resistor?
A 12- V battery causes a current of 0.40A through a resistor. A) what is its resistance B) how may joules of energy does the battery lose in minutes.
A 5.6 cm -thick layer of oil (n =1.46) is sandwiched between a 1.5 cm -thick sheet of glass and a 2.0 cm -thick sheet of polystyrene plastic (n = 1.59.) How long (in ns) does it take light incident perpendicular to the glass to pass through this 9..
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