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A dentist uses a small mirror of radius 54 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 16 mm from the tooth, what is the magnification of the resulting image?
Flicking your finger against your cheek makes a different sound from flicking it against your forehead. How is that similar to studying the interior of the Earth with seismic waves?
When she leaves the track, she follows the characteristic path of projectile motion. Ignoring friction and air resistance, find the maximum height H to which she rises above the end of the track.
What are the strength and direction of the electric field 2.6 cm from a small glass bead that has been charged to +6.0 nC?
The microscope form a virtual image 30 cm from the lens. (A) What is the magnification? (B) Is the image upright or inverted? (C) Draw a ray diagram.
A 280 block on a 58.0 -long string swings in a circle on a horizontal, frictionless table at 90.0. What is the speed of the block?
Assuming that r2/r1= 10.0 and ignoring any air inside the shell, find the temperature of the outer surface of the shell."
A 218 kg baby elephant is being lifted upward by cable into a helicopter. The upward acceleration of the elephant is 2.97 m/s2. Calculate the tension in the cable.
A 66-kg person on skis is going down a hill sloped at 30° from the horizontal. The coefficient of friction between the skis and the snow is 0.19. What would be the magnitude of the acceleration
The average distance it travels before decaying as measured by an observer on Earth? (c) What distance would it travel is time dilation did not occur?
A proton is projected perpendicularly into a magnetic field that has a magnitude of 0.30 T. The field is then adjusted so that an electron will follow a circular path of the same radius when it is
A bird sits on a high-voltage power line with its feet 5.0 cm apart. The wire is made from aluminum, is 3.0 cm in diameter, and carries a current of 160 A. What is the potential difference between
Suppose the mean radius of a planet is 6.79 *10^6 m, and that of its moon is 1.80 * 1^8 cm. Find the ratio of the planet's surface area to that of its moon
What is the maximum current that can be passed through the rods, in the same direction, before he is forced to yield? The same amount of current flows through both rods.
Two flat surfaces are exposed to a uniform, horizontal magnetic field of magnitude 0.43 T. Find the smallest possible value for the area of the second surface.
The coefficient of static friction between the block and the surface is 0.53. the angular acceleration of 0.50 rad/s2. after what time interval will the block start to slip on the turntable?
The return trip differ, depending on whether the plane flies against the earth's rotation or with it. However, under the conditions given, the flights are identical. Explain why.
If the drawings are accurate what should be the ratio of the maximum heights in your drawing and what should be the ratio of the ranges?
A 220 g block on a 54.0 cm-long string swings in a circle on a horizontal, frictionless table at 55.0 rpm.What is the speed of the block and tension in the string?
The right at 2.00 m/s, while the other, of mass 75.0 kg, is moving to the left at 2.80 m/s. What are the magnitude of the velocity of these skaters just after they collide?
Calculate the individual torques produced by the weights of the girl and boy on the see-saw in the figure below, given that Wgirl = 290 N and Wboy = 560 N.
How much work must be done by the brakes to bring the bike and rider to a stop? How far does the bicycle travel if it takes 3.5 s to come to rest?
The ball strikes the wall horizontally with a speed of 11 m/s, and it bounces back with this same speed. The ball is in contact with the wall 0.05 s. What is the average force exerted on the wall by
Using a crowbar to lift a rock is much easeir than lifting it with hands. does this mean that less work is done you use a crowbar to lift the rock than using your bare hands.
A planet's moon travels in an approximately circular orbit of radius 6.6 107 m with a period of 7 h 9 min. Calculate the mass of the planet from this information.