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Consider a protein sphere with a radius of 18 Angstroms and charge Q= -10e in an aqueous solution of c(infinity) = 0.05M Nacl at 25 degree centigrade.we assume that small ions as point charges and
Consider a pulse of laser light aimed at the Moon that bounces back to Earth. The distance between Earth and the Moon is 3.8 * 108m. Show that the round-trip time for the light is 2.5 s.
Four particles, one at each of the four corners of a square with 2-m-long edges, are connected by massless rods. The masses of the particles are m1 = m4 = 3.0 kg and m2 = m3 = 4.0 kg. Find the mome
What would the diameter of such a disk need to be if it is to store an amount of kinetic energy of E when spinning at an angular velocity of omega (w) about an axis perpendicular to the disk at its
A strong lightning bolt transfers and electric charge of about 11 C to Earth (or visa versa). How many electrons are transferred? Avogadro's number is 6.02214E23/mol.
The specific gravity of blood plasma at 37°C is 1.03. What is the minimum elevation of the bag so that the plasma flows into the vein?
How many photons per second would have to be emitted by a laser that fires a beam of cross sectional area 2 mm2 perpendicularly at the wall in order to exert a pressure of 1 atm on the wall? Assume
An object of mass is traveling on a horizontal surface. There is a coefficient of kinetic friction between the object and the surface. The object has speed when it reaches and encounters a spring.
What is the speed of the liquid flowing through the opening if the gauge pressure in the air space above the liquid is (a) zero and (b) 0.438 atm?
A 5.5µC and a 4.0µF capacitors are connected in series across a 24V battery. What voltage is required to charge a parallel combination of the two capacitors to the same total energy?
A 770 kg car moving at 24 m/s brakes to a stop. The brakes contain about 14 kg of iron that absorb the energy. What is increase in temperature of the brakes? Assume the specific heat of iron is 450
A transparent oil of index of refraction 1.29 spills on the surface of water. Assuming the maximum occurs in the first order, determine the thickness of the oil slick.
A 3.20 kg block is in equilibrium on an incline of 35.3?. The acceleration of gravity is 9.81 m/s2 . What is Fn of the incline on the block? Answer in units of N.
If the electron is released from the negative plate, what is its speed just before it strikes the positive plate? (b) what is the kinetic energy of the eletron in units of eV?
a 4700 kg helicopter accelerates upward at 2.95 m/s2. the acceleration of gravity is 9.8 m/s2. what lift force is exerted by the air on the propellers?
If the probe is to achieve a maximum distance of 8.0 multiplied by 106 m from the center of Zero, with what initial kinetic energy must it be launched from the surface of Zero?
Two speakers, one directly behind the other, are each generating a 152-Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a li
While in this first excited state, the electron receives 3.022 eV of energy. What is the quantum number n that describes the energy level that the electron ends up at?
Two 10 cm diameter charged disks face each other, 20 cm apart. The left disk is charged to - 50 nC and the right disk is charged to + 50 nC .
In the Atwood machine shown below, m1 = 2.00 kg and m2 = 7.95 kg. The masses of the pulley and string are negligible by comparison. The pulley turns without friction and the string does not stretch
A 230 , 21.0-cm-diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 0 to 1500 rpm in 5.00?
On a screen which is a distance of 1.90 away, the separation between dark fringes is 4.04. What is the separation of the slits?
A person exerts a horizontal force of F = 160 N in the test apparatus shown in the drawing. (h = 0.35 m.) Find the horizontal force M that his flexor muscle exerts on his forearm.
A weight lifter lifts a set of weights a vertical distance of 2.00 m. If a constant net force of 350 N is exerted on the weights, what is the net work done on the weights?