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A pair of eyeglasses is designed to allow a person with a far-point distance of 2.02m to read a road sign at a distance of 20.2m . A) Find the focal length required of these glasses if they are to b
A myopic student is shaving without his glasses. If his eyes have afar point of 1.5m what is the greatest distance he can stand from the mirror and still see his image clearly?
You pull your t-shirt out of the washing machine and note that 1446 particles have become attached, each of which could be either an electron or a proton. Your t-shirt has a net charge of -2.62e-17
On Venus, the acceleration due to gravity is 8.87 m/s2. How far would a 29 g rock fall from rest in 2.5 seconds if the only force acting on it was the gravitational force due to Venus?
calculate (a) the speed at which the fox leaves the snow (m/s), and (b) how long the fox is in the air(s). Ignore air resistance.
If your friend plans to drive at 75.0 mph and you plan to drive at 55.0 mph, how long will your friend be driving before he meets you? (Ignore acceleration and assume the highway forms a straight li
For a magnetic system the work done by the system is u(sub not)HdM, and the Gibbs free energy is given by G = U - ST + u(subb not)*HM. Show that
It is the electromagnetic equivalent of a bow wave or a sonic boom. An electron is traveling through water at a speed 7.8% faster than the speed of light in water. (a) Determine the electron's total
A baseball player hits a line drive. Just before the ball is struck, it is moving east at a speed of 39.6 m/s (89 mi/h). Just after contact with the bat, 1.07 x 10-3 s later, the ball is moving wes
Calculate the amount of charge that will flow through Mitch's amplifier once the capacitor has fully dissipated. HINT: Combine equations first before plugging in.
What is the ratio of the minimum viewing distance to the vertical dimension of the TV screen such that you will not be able to resolve the lines? assume the average wavelength of light coming from t
A step-up transformer has 4 turns on the primary coil and 500 turns on the secondary coil. If this transformer is to produce an output of 4500 V with a 12 mA current, what input current and voltage
A neon sign that requires a voltage of 12000 V is plugged into a 120 V wall outlet. What ratio of turns (primary/secondary) must the transformer have to power the sign?
A toroidal selenoid has 500 turns, cross-sectional area 6.25cm and mean radius 4.00cm a) Calculate the coil's self inductance
Two coils are wound around the same cylindrical form, When the current in the first coils is decreasing at a rate of -0.242 A/s , the induced emf int he second coil has magnituden1.65x10^-3V. a) Wh
How to derive the expression for the magnitude of the plasma frequency for the case of an actual plasma that is overall neutral and consists of electrons and positrons.
If the caffeine concentration in a particular brand of soda is 1.99 mg/oz, drinking how many cans of soda would be lethal? Assume 10.0 grams of caffeine is a lethal dose, and there are 12 oz in a ca
The half life of Thorium 227 is 18.72 days. It decays by alpha emission to Radium 223, an alpha emitter whose half life is 11.43 days. A particular sample contains 10^6 atoms of Thorium 227 and no R
An electron approaches a 1 nm wide potential energy barrier of height 5 ev. What energy electron has a tunneling probability of 10%?
Determine the speed of sound waves in water and find the wavelength of a 262 Hz wave. Hint note the medium through which the waves travel.
A sinusoidal wave with an amplitude of 1.5 cm and a frequency of 100 Hz travels at 200 m/s in the positive x-direction. Write the equation for the wave's displacement as it travels.
If the clock's driving spring is allowed to run down, damping due to the friction will cause the pendulum to slow to an eventual stop. If the time constant for decay is 300 sec, how long will it tak
A simple pendulum has a period of 2.40 seconds at a location where g = 9.810 m/s^2. What is the value of g at another place on the earth's surface where this pendulum has a period of 2.42 seconds.