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Explain why the electrostatic interaction in ionic solids would (if alone) result in the collapse of the crystal to zero size and what it is that prevents this collapse in real crystal ?
To focus a camera on objects at different distances, the converginglens is moved toward or away from the image sensor, so a sharpimage always falls on the sensor.
The convex lens of a copy machine has a focal length of 25 cm. A letter to be copied is placed 40.0 cm from the lens.
A 40 kg artillery shell was fired from a cannon with an initial speed of 84 m/s at a 45° angle above the ground. How far from the cannon (in m) did the lighter piece land
A metal ball of mass 0.22 kg with initial temperature of 95ºC is dropped into a container of 0.50 kg of water at 20ºC. what is the specific heat of the metal
The half life for the alpha decay of uranium 238 is 4.47x10^9 yrs old. Determine the age (in years) of the rock specimen that contains 60% of its original number of Uranium 238 atoms.
A rock weighing 7404 N rock with a volume of 29 L is completely submerged in mercury. The density of mercury is 13.6 kg/L. Decide the density of the rock. Decide the buoyant force on the rock.
The actual diameter of an atom is about a tenth of a nanometer (10-10 m). In order to develop some intuition for the molecular scale of a gas, Calculate the number of molecules in the sample of gas
If an object is placed between two parallel thin plane mirrors, an infinite number of images result. Find the distance of the images formed from the object
Which statements about a neutral atom are correct?
an object floats in the water with 60 of its volume submerged. what is its approximate density?a 400kgm3b
If this lens is then immersed in silicone oil with a refractive index of 1.52, what will the focal lens of the lens be in this environment
A rectangular fish tank measures 30 cm by 75 cm by 40 cm high. The tank is filled with water to a depth of 37 cm. What is the total force of the water on the bottom
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