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A flat, uniform lead cylinder floats on mercury at 0 ° C. Will lead float higher or lower if the temperature rises?
If 100 grams of water (specific heat of 1.00 cal/gm deg) at 5degrees Celsius is added to 500 grams of a substance with a precise heat of .25 cal/gm deg at 20 degrees Celsius in an insulated container...what is the final temperature of the mixture?
A sodium-vapor lamp has power output of 10.0 W. Using 589.3 nm as the average wavelength of this source, calculate the number of photons emitted per second
A boy shoves his stuffed toy zebra down a frictionless chute, starting at a height of 1.49 m above the bottom of the chute and with an initial speed of 1.55 m/s. How far from the bottom of the chute does the toy zebra come to rest
You suspend a 1 kilogram mass from a vertical spring (k=40 N/m) that is attached to the ceiling. Determine how fast is the mass falling when the spring has stretched out 30 cm
A ball on the end of a string is whirled around in a horizontal circle of radius 0.326 m. The plane of the circle is 1.1 m above the ground. Find the centripetal acceleration of the ball during its circular motion
A person starts from rest at the top of a large, frictionless, spherical surface, and slides into the water below, At what angle does the person leave the surface
a velocity selector is used in a mass spectrometer to produce a beam of charged particles with uniform velocity.suppose
Find the energy per second received by the eardrum when it listens to sound that is (a) at the threshold of hearing and (b) at the threshold of pain
Prior to the music CD, stereo systems had a phonographic turntable on which vinyl disk recordings were played. calculate the total number of rotations for the complete start-up
The wheels of a wagon can be approximated as the combination of a thin outer hoop, of radius rh = 0.209 m and mass 5.65 kg, and two thin crossed rods of mass 9.95 kg each. what should the radius of the disk be
A fox fleeing from a hunter encounters a 0.615 m tall fence and attempts to jump it. By how much does the fox clear the fence
A curve with a 140 radius on a level road is banked at the correct angle for a speed of 20 . If an automobile rounds this curve at 30 , what is the minimum coefficient of static friction between tires and road needed to prevent skidding.
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