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How much heat (in kcal) is necessary to change 68 g of ice at -33°C into water at 34°C? An insulator has a positive electric charge of 3.1 × 10 -17 C. How many electrons were removed?
a 1cm-tall object placed 20cm front of a concave mirror produces a virtual image that is twice the height of the object. what is the length of the mirror
Maria throws Jackson a life preserver attached to a rope. Jackson's mass is 235 kg. If Maria pulls Jackson upward with an acceleration of 3.5 m/s^2, how much tension is in the rope
A system performs 357 J of work on its surroundings while losing 133 J of internal energy. Determine the heat transferred to the system during this process
A 140g coin sits on a horizontally rotating turntable. The turn table makes on revolution each 2 s. the coin is located 8.00 cm from the axis of rotation of the turntable. The acceleration of gravity is 9.81 m/s/s. what is the frictional force acting..
Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Calculate the magnitude and duration of the acceleration
The planes of atoms in a cubic crystal lie parallel to the surface, 0.74 nm apart. X rays having wavelength 0.40 nm are directed at an angle theta to the surface.
A student holds a laser that emits light of wavelength 633nm. The beam passes through a pair of slits separated by 0.3mm, Find the speed of the first-order maxima on the screen
The lower weight is a light bag filled with sand. Assume a pin pokes a hole in the bag and the sand slowly leaks out while the puck is revolving. What would be the puck's speed after all of the sand is gone.
At some instant the velocity components of an electron moving between two charged parallel plates are vx = 1.90 105 m/s and vy = 3.00 103 m/s. What is the electron's acceleration in the field
Speakers A and B are vibrating in phase. They are directly facing each other, are 8.0 m apart, and are each playing a 76.0-Hz tone. The speed of sound is 343 m/s. On the line between the speakers there are three points where constructive interfere..
Two objects of weight W1 and W2 are placed on a frictionless inclinced plane are connected by a massless string looped over a massless pulley. Find the acceleration of the two objects
The supersonic aircraft Concorde has a length of 61.6m when sitting on the ground on a typical day when the temperature is 12.0C . The Concorde is primarily made of aluminum
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