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A microscope with an 9.0 mm focal-length objective has a tube length of 14.0 cm For the microscope to be in focus, how far should the objective lens be from the specimen?
a resonance tube for a pipe-organ is closed at the bottom by a speaker pressure antinode and open to the atmosphere at
An astronaut is tethered by a strong cable to a spacecraft. The astronaut and her spacesuit have a total mass of 104 , while the mass of the cable is negligible. What force does the cable exert on the astronaut
A strip of copper 20 mm wide and 550 µm thick is placed in a uniform magnetic field B of magnitude 0.55 T, with B perpendicular to the strip. What is the current density in this strip
A horizontal force of 210N is exerted on a 2.0 kg discus as itrotates uniformaly in a horizontal circle ( at arm's length ) ofradius .90 m. Calculate the speed of the discus
Point charges q1 = -4.10 nC and q2 = -4.10 nC are separated by distance 3.00 mm, forming an electric dipole. What is the direction fo the dipole moment
A point source of light illuminates an aperture 2.00m away. How wide is the aperture
A massless string is wrapped around a solid disk of mass m_1 and tied to a block of mass m_2. The disk is free to rotate on a frictionless horizontal axle.
The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. What is the magnitude of the electric field in the membrane
A rock is shot vertically upward from the edge of the top of a tall building. The rock reaches its maximum height above the top of the building 1.30 s after being shot. find With what upward velocity was the rock shot
Four identical masses of 2.1kg each are located at the corners of a square with 2.0m sides. What is the net force on any one of the masses
You wish to create an image that is 15 meters from an object. This image is to be inverted and four times the height of the object. What type of image is created, real or virtual
Two cars are each traveling at 27.0 m/s, and they are approaching each other. The security alarm in one of the cars accidentally sounds. What frequency fo is heard by the driver of the other car
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