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Hold a pocket mirror at almost arm's length from your face and note the amount of your face you can see. To see more of your face, must you hold the mirror closer or farther, or would you have to have a larger mirror?
One runner ran the 100-m dash in 11.9 s. Another runner came in secona at 12.4 s. Assuming that the runners traveled at their average speeds for the entire distance, determine the sepaaration between the two runners when the winner crossed the fin..
A string of linearmass density μ1 is connected smoothly to a string of linea rmass density μ2. Find the refection and transmission amplitudes in terms of the mass densities, and independently in terms of the wave velocities.
Equipotentials between two parallel lines with a floating circular electrode: I dont need to know the exact potentials, What should be the potential inside the electrode
an electron with an initial speed of 4.50times105 rm ms is brought to rest by an electric field. what was the potential
an evacuated spherical diving bell containing a camera is in the ocean at a depth of 115 m. it has a flat transparent
a child tosses a ball straight up. she says the ball is moving away from her hand because the ball feels an upward
A speedboat increases its speed uniformly from v1 = 20 m/s to vf = 25 m/s in a distance of 2.40 102 m. (a) Draw a coordinate system for this situation and label the relevant quantities, including vectors.
The Moon is 3476 km in diameter and orbits the Earth at an average distance of 384,400 km. What is the angular size in radians of the Moon as seen from Earth
A single-turn current loop, carrying a current of 5.67 A, is in the shape of a right triangle with sides 62.8, 114, and 130 cm. The loop is in a uniform magnetic field of magnitude 64.6 mT whose direction is parallel to the current in the 130 cm s..
The electric field at the surface of a charged, solid, coppersphere with radius 0.210 m is3380 N/C directed toward the center ofthe sphere. What is the potential at the center of the sphere, ifwe take the potential to be zero infinitely far from thes..
An automobile engine takes in 4000 J of heat and performs 1100 J of mechanical work in each cycle. How much heat is "wasted" in each cycle
q1. a car moving at 37 ms approaches a stationary whistle that emits 270 hz sound. the speed of sound is 347 ms. what
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