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About the years 214-212 BC, the Greek philosopher and scientist Archimedes is said to have repelled a Roman attack with a "death-ray" concave mirror, using sunlight to set the approaching fleet on fire. Assume an early morning attack from the East, with the Sun directly behind the ships. If the approaching fleet is 500 meters away, what would need to be the radius of curvature of the mirror in order to achieve maximum effect?
A hardworking ant must supply 0.0500 N to pull a small piece of fruit at constant velocity over a distance of 8.00 cm up a small hill to the entrance of the colony, calculate the work done by the ant by pulling the piece of fruit up the hill
you suspect that an unknown is acetanilide mp 113.5-114oc. give a qualitative estimation of the melting point when the
Anelastic conducting material is stretched into a circular loop of15.0 cm radius. It is placed with itsplane perpendicular to a uniform 0.800T magnetic field. What emf is induced in the loop at that instant
In a TV-show, an inexperienced doctor touches the electrodes of a defibrillator and gets thrown across the room, what is the maximum height above ground he could reach
A planet orbits a star once every 2.99 107 s in a nearly circular orbit of radius 1.42 1011 m. With respect to the star, determine the angular speed of the planet
A jet engine emits sound uniformly in all directions, radiating an acoustic power of 3.69 × 105 W. Calculate the corresponding sound intensity level
A curved plate of mass M is placed on the horizontal, frictionless plane as shown. How high the puck will shoot up from the plate
An electron is accelerated by the voltage 1000V. What is the kinetic energy and speed of the electron
A skydiver of 75 kg mass has a terminal velocity of 60m/s. At what speed is the resistive force on the skydiver half that when at terminal speed
What would the diffraction pattern look like if the light you used was composed of several specific wavelengths
Threshold freq. of metal isf0. When the light of freq. 2f0 is incident on the metal max velocity of electrons is v1 and v2
A boy pulls a friend in a little red wagon with constant speed. If the boy pulls with a force of 16 Newton for 12.4 meter, compute how much work does the boy do on the wagon
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