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The far point of a nearsighted person is 5.5 meter from her eyes, and she wears contacts that enable her to see distant objects clearly. A tree is 19.8 meter away and 2.1 meter high.
(a) When she looks through the contacts at the tree, determine what is its image distance?
(b) Determine how high is the image formed by the contacts?
A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 5.00 g coins stacked over the 15.0 cm mark, the stick is found to balance at the 42.0cm mark. What is the mass of the meter stick
When a gas is quickly compressed (say by pushing down a piston), its temperature increases. When a gas expands against a piston, it cools. Describe these changes in temperature using the kinetic theory, in particular nothing what happens to the momen..
An electron and a positron have masses of 9.11 10-31 kg. They collide and both vanish, with only electromagnetic radiation appearing after the collision. determine the energy of the electromagnetic radiation
A new type of personal scale is designed where the person stands on top of a platform supported by a rubber cylinder which has a radius of 5 cm and a height of 10 cm. What is the mass of the person
A charge of 1.71 mC is placed at each corner of a square 0.170 m on a side. Determine the direction of the force on each charge
Certain stars at the end of their lives are thought to collapse combining their protons and electrons together to form a neutron star. Such a star could be thought of as a giant atomic nucleus.
A 50-kg person steps on a scale in an elevator that is moving upward. The scale reads 512.5 N. What is the magnitude in m/s2 of the acceleration of the elevator
The index of refraction for red light in water is 1.331 and that for blue light is 1.340. what are the underwater angles of refraction for the blue and red components of the light
an ac generator consists of 6 turns of wire. each turn has an area of 0.040m2. the loop rotates in a uniform field
question1an average human body might be considered to have a black surface of area 10m2 and surface temperature is
An ion source is producing 6Li ions, which have mass 9.99 x10-27 kg and charge +e. The ions are accelerated by a potential difference of 30 kV and pass horizontally into the region in which there is a uniform vertical magnetic field of magnitude B..
To make ice, a freezer that is a reverse Carnot engine extracts 50 kJ as heat at -15°C during each cycle, with coefficient of performance 5.7. Find how much energy per cycle is delivered as heat to the room
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