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Environmental Preservation and Behaviors Considering what you've learned in this course, outline the three most important aspects of the environment that we should protect at the highest priority. How do your current behaviors affect these three things? What can you do to change your behaviors?
A 25.8-mW laser beam of diameter 1.99 mm is reflected at normal incidence by a perfectly reflecting mirror. Calculate the radiation pressure on the mirror
Estimate the shear stress if this force is ex- erted on a 0.412 cm -thick pine board that is 13.7 cm wide
An electron gun sends electrons through a region with an electricfield of 1.5 104 N/C for a distance of 2.5cm. If the electrons start from rest, how fast are they moving after traversing the gun?
Illustrate what is the tangential velocity of the bug? One second after the bug starts from rest, what are its tangential acceleration, radial acceleration, and total acceleration(with the degree)
A proton moving freely in a circular path perpendicular to a constant magnetic field takes 1.50μs to complete one revolution. Evaluate the magnitude of the magnetic field
a cart starts from rest at the top of the tilted track. assume the track is frictionless. the cart passes photogate a
A 120-g mug at 21C is filled with 210g of coffee at 91C. suppose all of the heat lost by the coffee is transferred to the mug, what is the final temperature of the coffee? The specific heat capacity of the mug is 7.8 X 10^2 J/(Kg C)
question a 5 kg ball is thrown upward with an initial speed of 30 meters per second. suppose there is a constant air
When a certain photoelectric material is illuminated with red light (?=715) and then blue light (?=400), calculate the work function of the material
Astronauts put their spaceship into orbit about a planet. How far above the planet's surface are they orbiting
Derive the equation for centripetal acceleration from the position equations x=Rcostheta and y=Rsin(theta).
A hoop and a disk, both of 0.72- m radius and 5.0- kg mass, are released from the top of an inclined plane 3.0 m high and 7.1 m long. What is the speed of the hoop
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