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Q. Four identical masses of mass 900kg each are placed at the corners of a square whose side lengths are 10cm. what is the magnitude of the net gravitational force on one of the masses, due to the other three?
Q. Mr. Physics drops a rock down a 250-meter deep well. Upon impact with the bottom of the well a short burst of sound is produced with a frequency of 250 Hz. How long after he drops the rock does he hear it hit the bottom of the well?
A block has an initial speed V(o) > 0 on a linear trajectory on the surface with friction coefficient u and air resistance (F = cv^2). Derive an equation that will represent the velocity (V) as a function of the position of the block (x). So V(x).
What is the net entropy change
The distance between a loudspeaker and the left ear of a listener is 1.60 m. compute the time required for sound to travel this distance if the air temperature is 20° C.
A string of mass 0.0003kg/m and 0.5m long is vibrating 200 cycles per second. What must be the tension? What hanging mass would generate this tension? I got 12N for tension. Is this correct? And how would you solve for hanging mass.
A microscope with an eyepiece lens of focal length 1.90 cm and an objective lens of focal length 1.15 cm is used to examine a section of the brain of a sacrificed rat. The distance between the lenses of the instrument is 24.0 cm and final image is vi..
What is the frequency of up and down oscillations of the wheel? Regard wheel as a mass on one end of a spring and regard the body of the car as a fixed support for the other end of the spring.
An asteroid is discovered heading straight toward Earth at 13 . An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 , after which the asteroid is moving at 29 to its original path at a speed of 18..
What is mechanical energy
An aluminum cup of mass 200 g contains 800 g of water in thermal equlibrium at 80.0c. the combination of cup and water is cooled unformly so that temperature decreases by 1.50c per minute. at what rate is energy being removed by heat.
The diodes are oppositely oriented, so that when one diode is forward-biased, the other is back-biased. Which phrase best describes the current in the circuit.
Coherent light with wavelength 609 passes through two very narrow slits, and interference pattern is observed on a screen a distance of 3 from the slits.
A 9.40kg projectile is fired vertically upward. Air drag decreases the mechanical energy of the projectile-Earth system by 69.5kJ throughout the projectile's ascent. How much higher would the projectile have gone were air drag negligible.
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