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A vertical 2-meter stick is placed on the ground so that y = 0.0 m is the point on the stick in contact with the ground. A camera is at the top of the stick (at y = 2.0 m) and is aimed at a flat vertical mirror 3.0 m away. An opaque sheet is placed over the bottom of the mirror. When the camera views the reflection of the stick, the top 0.8 m of the stick can be seen (that is y = 0 m to y = 1.2 m is hidden because of the sheet). What is the height h of the sheet?
In which one of the following circumstances could mechanical energy not possibly be conserved, even if friction and airresistance are absent? why?
A stamp collector uses a lens with 7.3 cm focal length as a easy magnifier. The virtual image is produced at the normal near point (25 cm). How far from the lens must the stamp be placed? What is the expected angular magnification?
a golfer lines up for her first putt at a hole that is 18 m exactly northwest of her balls location. she hits the ball
Two forces, F? 1 and F? 2, act at a point. F? 1 has a magnitude of 8.20N and is directed at an angle of 60.0, What is the x and component of the resultant force
Four identical charges (+2uC each) are brought from infinity and fixed to a straight line. The charges are located .4 m apart. Determine the electric potential energy of this group.
Water is flowing in a cylindrical pipe of varying circular cross-sectional area, and at all points the water completely fills the pipe. What is the radius of the pipe at this point
A 1.2 kilogram object moving with a speed of 8m/s collides perpendicularly with wall and emerges with a speed of 6m/s in the opposite direction, find the magnitude of the average force on the object by the wall
A 2.10-kg block is suspended from a spring with a spring constant of 480.0 N/m. What fraction of the original kinetic energy of the bullet appears as mechanical energy in the system of block-spring-bullet
to focus a camera on objects at different distances the converging lens is moved toward or away from the film so a
The electron drift speed is 2.3 x 10-4 m/s in a metal with a mean free time between collisions of 6.0 x 10-14s. What is the electric field strength
An automobile of mass 1500 kg moving at 25 m/s colides with a truck of mass 4500 kg at rest. What is the final velocity of the truck after the collision
an electron is initially at rest just outside a large copper surface that has a charge density of 1.04 x 10-6 cm2. how
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