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When a 7.5 cm long pencil is arranged perpendicular to a convex mirror's optical axis at a distance of 25 cm from the mirror, its image is 3.8 cm tall. (a) What is the mirror's focal length (include sign if negative)? (b) How tall is the pencil's image if the pencil is moved to a distance of 45 cm from the mirror (include sign if negative)?
A uniform electric field of magnitude 249 V/m is directed in the negative y direction. A +13.4 ?C charge moves from the origin to the point (x, y) = (15.0 cm, 50.8 cm)
Two sinusoidal waves of the same period, with amplitudes of 5.5 and 7.5 mm, travel in the same direction along a stretched string; What is the phase constant of the other wave
A cat is stuck in a tree. You are designated with the job to get it out, yet you do not want to climb the tree, because you may get stuck as well. What force does the seat exert on you
A golfer, standing on a fairway, hits a shot to a green that is elevated 6.91 m above where she is standing. find the time that the ball is in the air before it hits the green
What is the percentage difference between the speeds of red light and violet light in diamond, What is this percentage difference in flint glass
The H-alpha emission line from gas within a elliptical galaxy has a half-width of 6.5 Angstroms, representing a spread in velocity from opposite sides of the galaxy due to rotation.
A proton enters the region between the two plates shown in the figure moving in the x-direction with a speed v = 1.61 106 m/s. The potential of the top plate is Vt = 245 V, and the potential of the bottom plate is Vb = 0 V.
What was the arrow's initial speed. A small sphere with a mass of 2.00×10^-3g and carrying the charge of 4.80×10^-8C hangs from a thread near a very large, charged insulating sheet. The charge density on the sheet is -2.90×10^-9C/m^2 .
The speed of an ion in a particle accelerator is doubled from 0.400c to 0.800c. The initial relativistic momentum of the ion is 4.20 x 10-17 kg·m/s. estimate the final relativistic momentum of the ion
Two 3 cm long parallel wires in a handheld calculator are 1 mm apart. The currents are in the same direction and have values 0.5 µA and 2.2 µA, respectively
The skater farthest out has a mass of 58.0 kg and is 7.80 m from the pivot. He is skating at a speed of 6.40 m/s. Find out the magnitude of the centripetal force that acts on him.
After falling from rest from a height of 30m, a 0.53 kg ballrebounds upward, reaching a height of 20m. what average force was exerted on the ball
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