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A juniper-wood plank measuring 0.32 ft by 1 ft by 12 ft is totally submerged in water.
(a) What is its weight?
(b) What is the buoyant force acting on it?
(c) What is the size and the direction of the net force on it?
Two trains on separate tracks move toward one another. Train 1 has a speed of 130km/hr and train 2 has a speed of 90km/hr. What is the frequency heard by the engineer on train
Derive a formula for the number of neutrinos per unit volume in the neutrino background radiation. Evaluate your result numerically for the present neutrino temperature of 1.95 K.
An aircraft takes off at 203 km/h after accelerating from rest at 2.14 m/s2. What is the minimum runway length required
A mass sitting on a horizontal, frictional surface is attached toone end of a string, the other end of a wall. 6.0 J of work isrequired to compress the spring 0.14 m. If the mass is releasedfrom rest with the spring compressed, it experiences a ma..
A Carnot engine has 40 g of helium gas as its working substance. It operates between two reservoirs of temperatures T1 = 400°C and T2 = 60°C. find the work generated by this engine during one cycle
A snow surface has a temperature of -10C. What is the full spectrum remittance (assuming that snow can be treated as a blackbody for long wave radiation)?
A subway train has three cars, each weighing 1.20 x 105 N. The frictional force on each car is 103 N, and the first car, acting as an engine, What is the tension between the second and third cars
A H2 molecule can be approximated by a simple harmonic oscillator having a spring constant k = 1.1 ? 103 N/m. How many different energy transitions are possible when the H2 molecule decays from the third excited state down to the ground state?
use the laws of classical mechanics to solve this problem. an atom of mass m moves in positive x direction with speed
A 2.5 cm-long horizontal wire segment has mass 0.15 g and carries a current sufficiently large that it levitates when the segment is in a region of B field upward with magnitude 1.5 T
Choose a metal and choose a wavelength that ejects electrons at a reasonable speed. Turn the light intensity up and down. Make note of the number of electrons ejected. Why does the number change
What is the electrical force between a two charges that each has a charge value of .0004 C each that are 2 meters apart
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