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A certain eye, when relaxed, needs a +0.67 d lens in front of the eye to form a clear image on the retina of a distant object. Where is the (virtual) object seen by the eye?
A spherically symmetric electromagnetic wave is emitted by a 1030 W source. What is the rms value of the electric field at that distance
a large boulder is ejected vertically upward from a volcano with an initial speed of 40.2 ms. air resistance may be
a cylindrical can 8.00cm outside diameter and 20cm high floats upright in the water. how high will the water rise
Two identical launchers fire projectiles with the same initial velocity. One launcher is 3.54m above the ground and fires horizontally. what is the intial velocity of the projectiles
The 20-cm-long wrench in the figure swings on its hook with a period of 0.80s, What is the moment of inertia about the hook
You have two small 2.0- balls that have been given equal but opposite charges, but you don't know the magnitude of the charge. To find out, you place the balls a distance apart on a slippery horizontal surface, release them, and use a motion detec..
A He-Ne laser produces light of wavelength 633 nm with intensity 1.05 103 W/m2, over a beam of cross-sectional area 1.03 mm2. How many photons per second are emitted by the laser
After a 0.813 nm x-ray photon scatters from a free electron, the electron recoils with a speed equal to 1.46E+6 m/s. Through what angle was the photon scattered
Suppose one bullet with M=5.12g moving to the right with a speed of 250 m/s directed at 21.3 degrees above the horizontal collides, What is the direction of their common velocity immediately after the collision? Measure this angle in degrees from t..
a simple reaction-time test a meter stick is held vertically above your hand with the lower end between your thumb and
A 240g ball and a 130g ball are connected by a 32 cm-long massless, rigid rod. The structure rotates about its center of mass at 150rpm.
Tim and Rick both can run at speed v_r and walk at speed v_w, with v_{rm r} > v_{rm w}. They set off together on a journey of distance D. Rick walks half of the distance and runs the other half. Tim walks half of the time and runs other half.
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