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A boy scout starts a fire by using a lens from his eyeglasses tofocus sunlight on kindling 4.6 cm fromthe lens. The boy scout has a near point of 14.2 cm. When the lens is used as a simplemagnifier, give values for the following conditions. (Hint: Assumea "normal" eye.)
(a) What is the maximum magnification that canbe achieved.
(b) What is the magnification when the eye is relaxed.
Two small balls, each of mass 14g, are each charged with +9.0 nC. What distance apart must they be if the force on one of them has the same magnitude as the weight of that ball?
A 10-m-long glider with a mass of 780kg(including the passengers) is gliding horizontally through the air at 30m/s when a 70Kg skydiver drops out by releasing his grip on the glider. What is the glider's speed
A 4.4-m-tall, 30-cm-diameter concrete column supports a 5.0×105kg load. By how much is the column compressed
A rocket is launched at an angle of 59° above the horizontal with an initial speed of 97 m/s. The rocket moves for 3s along its initial line of motion with an acceleration of 28m/s2.
a thin double convex lens is to focus the image of an object onto a screen so that the image is life sized. how far is the screen from the object
In the annual battle of the dorms, students gather on the roofs of Jackson and Walton dorms to launch water balloons at each other with slingshots. Find the initial speed of this second balloon
A student at another university repeats the experiment you did in lab. What is the kinetic energy (in joules) of the target ball just after it is struck
A well with vertical sides and water at the bottom resonates at 7.00 Hz and at no lower frequency. How far down in the well is the water surface
A fan is spinning at 900 rpm. When its motor is turned off it makes 75 rev before coming to a stop. If the work down by dissipative forces is 44.4J, Find the moment of Inertia of the fan and the torque due to dissipative forces.
A 250 kg flatcar 25 m long is moving with a speed of 3.0 m/s along horizontal frictionless rails. how far has the flatcar moved
consider two solid disks of identical radius and thickness. one of the disks is made of aluminum (density=2.7g/cm), what is the ratio between the two moments of inertia
A solid metal sphere of radius a= 1.30 cm is surrounded by a concentric spherical metal shell of inner radius b= 2.50 cm and outer radius c= 3.00 cm. What is the surface charge density, sigmac, on the outer surface of the outer spherical conductor
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