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What are the concerns about global warming? How could CO2 pollution be decreased while our energy needs are still being met? Assuming that the name has not been retired, what will be the name of the third Atlantic tropical storm in 2008?
A microwave oven operates at 2.4 GHz with an intensity inside the oven of 2350W/m^2. What is the amplitude of the oscillating electric field
A race car travels northward on a straight, level track at a constant speed travels 0.764 km in 17.0 s. The return trip over the same track is made in 22.0 s. What is the average velocity for the total trip
A boat, which has a speed of v= 12.0 m/s in still water, heads directly across a river which has a current of 7.00 m/s and is d = 480 meter wide. Obtain how far downstream will this boat reach the opposite shore
A snowboarder is pulled by a tow rope along a horizontal surface with a constant force of 60 N. How far must the boarder be pulled, starting from rest, so that her final kinetic energy is 500 J.
A pot of water is boiling under one atmosphere of pressure. Assume that heat enters the pot only through its bottom, What is the temperature of the heating element in contact with the pot
you are designing an electro microscope capable of resolving two features separated by 1 nm. the f-number fd is 100.
An astronaut constructs a pendulum with a length of 1 meter on a new planet. If the period is 4 second, what is the acceleration due to gravity
A turntable has a moment of inertia of 0.030 kg-m2 and spins freely on a frictionless bearing at 25 rev/min. Determine the new rate of rotation of the system
The angular acceleration of a wheel is α =6t4-4t2 with α in radians/s2 and t in seconds. Write expressions for angular velocity
An electron moving in one dimension is confined between two walls seperated by a distance L = 10^-10 m. What is the average force that the electron exerts on the walls
a block is pushed across a rough horizontal surface by a horizontal force of magnitude P= 25 . The coefficient of kinetic friction between the block and the ground is 0.3 if the blck started from rest
A 4.5kg ball with a velocity of 4.4m/s in the +x-direction collides head-on elastically with a stationary 1.8kg ball. What is the speed of the first ball after the collision? What is the speed of the second ball after the collision?
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