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Radar uses radio waves of a wavelength of 2.3m. The time interval for one radiation pulse is 100 times larger than the time of one oscillation; the time between pulses is 10 times larger than the time of one pulse. What is the shortest distance to an object that this radar can detect
A homer run is hit in such a way that the baseball just clears a wall 14m high, located 122m from home plate. find the speed of the ball when it reaches the wall
suppose a star is at a distance of 20 parsec from Earth. What is its apparent magnitude m? If the star has the same luminosity as Sun, what is its absolute magnitude M?
If a mass m_a = 2m has intial velocity 4m/s and mass m_b = m is initially at rest, they undergo elastic collision. Calculate their final velocities after the collision
A filament running along the x axis from the origin to x = 80.0 cm carries electric charge with uniform density. what electric potential is created by the pair of filaments
a pottery wheel is rotating initially with an angular velocity of 4.0rad/s clockwise. find the direction of the angular acceleration of the wheel
Driving home from school one day you spot a ball rolling out into the street. You brake for 1.30 s, slowing your 840 kg car from 16.0 m/s to 9.50 m/s. How far did you travel while braking
An object, with mass 12 kg and speed 30 m/s relative to an observer, explodes into two pieces, one 3 times as massive as the other; the explosion takes place in deep space. The less massive piece stops relative to the observer. How much kinetic energ..
Very short pulses of high-intensity laser beams are used to repair detached portions of the retina of the eye. find the maximum value of the magnetic field in the laser beam
Two equal-mass stars maintain a constant distance apart of 4.8E10 m and rotate about the point midway among them. They make one revolution every 2.6 yr. What is the mass (in kg) of each star?
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water
An object is placed in front of a converging lens in such a position that the lens (f = 14.0 cm) creates a real image located 28.0 cm from the lens. What is the image distance of this new image
A net force of 32 N accelerates a 4.7-kg mass over a distance of 15 m. What is the total work done by this net force
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