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The intensity of electromagnetic radiation from the sun reaching the earth's upper atmosphere is 1.37kW/m^2.
Assuming an average wavelength of 680 nm for this radiation, find the number of photons per second that strike a 1.20 m^2 solar panel directly facing the sun on an orbiting satellite. Express your answer using three significant figures.
a block is at rest on an inclined plane whose elevation can be varied. the coefficient of static friction is ms 0.42
what is the direction of the current low in the wire segment closest to you labelled by i in the figure and which direction will the loop rotate (clockwise or counter clockwise)?
find the velocity of the falling parachutist. assuming the initial velocity is zero the mass is 68.1kg,drag is 12.5 kg/s, gravity is 9.8m/s2 and the time is 10s
A bowling ball (mass = 7.2 kg, radius = 0.15 m) and a billiard ball (mass = 0.32 kg, radius = 0.028 m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other?
A bullet with a mass of 4.25g , traveling horizontally with a speed of 434m/s , is fired into a wooden block with mass of 0.786kg, What is the decrease in kinetic energy of the bullet
An isolated conductor of arbitrary shape has a net charge of +11 x 10- 6 C. what is the charge on the outer surface of the conductor
A short mild steel column with fixed ends has a cross section of 100mm by 50mm. Assuming a safety factor of 6 calculate the load that it can safely support?
A wedge of mass m=36.1 kg is located on a plane that is inclined by an angle ?=21.3 degrees with respect to the horizontal. A force F=302.3 N in the horizontal direction pushes on the wedge. The coefficient of kinetic friction between the wedge and t..
An electron and a proton are initially very far apart (effectively an infinite distance apart). which is the change in the electric potential energy
A scientist notices that an oil slick floating on water when viewed from above has many dissimilar rainbow colours reflecting off the surface. She aims a spectrometer at a particular spot and measures the wavelength to be 750 {\rm nm} (in air). The i..
a catapult launches a test rocket vertically upward from a well giving the rocket an initial speed of 80.2 ms at ground
If the air in the tube is replaced with a different gas, the frequency of the fundamental standing wave changes to 60·Hz. What is the speed of sound in this new gas
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