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An object is 24 cm in front of a diverging lens that has a focal length of -14 cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 2.5?
suppose there are 500 billion stars in the galaxy. How does your answer change if there are only 110 civilizations instead of 1.2×10^4.
A speeding motorist traveling 105km/h passes a stationary police officer. The officer immediately begins pursuit at a constant acceleration of 12km/h/s (note the mixed units).
a 12-kg block on a horizontal frictionless surface is attached to a light spring force constant 0.80 knm. the block is
question1two rectangular optically flat glass plates of index of refraction 1.46 are in contact along one end and are
At one end of a ripple tank 90 cm across, a 6 Hz vibratorproduces waves whose wavelength is 50 mm. Find the time the waves need to cross the tank
A steel section of the Alaskan pipeline had a length of 65 m and atemperature of 22°C when it was installed. What is its change in length when the temperature dropsto a frigid -48°C?
A particle of mass 4m is placed 0.91 meter from a particle of mass m. Determine where should you put a third mass M so that the net gravitational force on M due to the two masses is exactly zero
As Achilles approaches Boagrius, Boagrius throws his spear at Achilles. Find what was the average force acting on the 4.5 kg spear
calculate the emission temperature of the earth, if the planetary albedo is changed to that of ocean areas without clouds, about 10%
When a converging lens is used in a camera (as in the first drawing), the film must be placed at a distance of 0.240 m from the lens to record an image of an object that is 3.80 m from the lens. How far from the projector lens should the film be pl..
The venturi flowmeter shown in the figure is used to measure the flow rate of water in a solar collector system. The flowmeter is inserted in a pipe with diameter 1.9 {rm cm}; at the venturi of flowmeter the diameter is reduced to 0.64 {rm cm}. Th..
A positivly charged rod is brought near them.Then, one of the two shpheres is displaced momentarily so that thetwo spheres touch briefly. After this, one shphere is found to havea net charge of 2.9nC. What is the charge in the second sphere? (Itwi..
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