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An athlete in a competition needs to get from point A to another point B directly across from a river. He can swim in stationary water at a speed of 2.0 mi/h, and he can run at a speed of 5.0 mi/h. If the river does not flow, then to get from A to B he would certainly choose to swim directly across. But the river flows at a speed of 1.5 mi/h downstream. Given that, what would his strategy be in order to minimize the total time it takes to move from A to B? i.e., at what angle upstream (measured from the line AB) should he be swimming?
A magnesium surface has a work function of 3.68 eV. Calculate the maximum kinetic energy of the ejected electrons
calculate the force p required to drag the block of mass 2 kg up the hill of angle 30 degrees at a constant velocity b
A bicycle with a mass of 20 kg drives over a semi-circular of radius 18.2 meters. what is the radius of the hill in meters
The density of ice is 0.92 g/cm^3, and the density of seawater is 1.03 g/cm^3. A large iceberg floats in Artic waters. What fraction of the iceberg is exposed
A steel wire with mass 22.3 g and length 1.08 m is strung on a bass so that the distance from the nut to the bridge is 1.10 m. Compute the linear density of the string
A particle moves in simple harmonic motion with a frequency of 2.60 Hz and an amplitude of 6.00 cm. Through what total distance does the particle move during one cycle of its motion
An AC generator supplies an rms voltage of 120 V at 60.0 Hz. It is connected in series with a 0.350 H inductor, a 5.00 ?F capacitor, What is the peak voltage across the capacitor
the sound level measured 5.2 m away from a jet engine is 140 db.a what is the intensity of the sound at 5.2 m?b what is
A light ray in air enters a glass slab at point A at incident angle theta1 and then undergoes total internal reflection at point B,. What is the maximum value of theta1if the index of refraction of the glass is 1.4? For the ray of light that goes fro..
Consider the highest-lying electron on the boron atom. What is the value of the orbital angular momentum of this electron. What are the possible values of the z-component of orbital angular momentum?
A pair of slits, separated by 0.160 mm, is illuminated by light having a wavelength of ? = 566 nm. An interference pattern is observed on a screen 150 cm from the slits. Consider a point on the screen located at y = 1.90 cm from the central maxim..
Light of wavelength 380 nm is incident on the face of a silica prism at an angle of 1 = 64.2 (with respect to the normal to the surface). Find the angle between the incident and emerging rays
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