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A lens objective magnifies on an object 10 cm away by 12 times in air. The magnitude of an eyepiece focal length of 2cm. How far apart must the lenses be placed?
) On a horizontal frictionless surface, a block of mass M is sliding along on constant velocity v. A block of mass m lands on top of the original block. What is the velocity of the new system
Insects do not have lungs as we do, nor do they breathe through their mouths. Instead, they have a system of tiny tubes, called tracheae, find the oxygen concentration at the interior end of the tube
A baseball is thrown with an initial velocity of 20 m/s along the horizontal axis and 15 m/s along the vertical axis. The ball soon reaches the highest point, what is the speed at the point? (ignore air friction) Can you give me an explanation as to ..
Monochromatic light with wavelength 570nm passes through a circular aperture with diameter 7.00?m. What is the diameter of the Airy disk on the screen
A 1.3 kilogram ball and a 2.4 kilogram ball are connected by a 1.0 meter long rigid, mass less rod. The rod is rotating about its center of mass at 20 rpm. Find what torque will bring the balls to a halt in 4.2 second
A child pulls a friend in a little red wagon with constant speed. If the child pulls with a force of 16 N for 10.0 m, how much work does the child do on the wagon
2.1 m length of straight wire carries a current of 30 A in a uniform magnetic field of 55 mT whose direction is at an angle of 37° from the direction of the current
A soccer ball is kicked from the groundwith an initial speed of 19.9 m/s at anupward angle of 45°. A player 55 m away in the direction of thekick starts running to meet the ball at that instant. What must behis average speed if he is to catch the bal..
Imagine holding the above plastic block under water. When released, what is the upward acceleration of the block? (use g = 10 m/s2)
a proton and an alpha particle which has twice the charge and four times the mass of the proton are each accelerated
The windshield of a speeding car hits a hovering insect. Consider the time interval from just before the car hits the insect to just after the impact. Which of the following are right.
Determine the magnification of a magnifying glass of focal length 4 centimeter if the image is to be viewed by a relaxed eye with a near point of 25 centimeter
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