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An object weighing 32 lb is released from rest 50 ft above the surface of a calm lake. Before the object reaches the surface of the lake, the air resistance (in lbs) is given by 2v, where v is the velocity (in feet per second). After the object passes beneath the surface, the water resistance (in lbs) is given by 6v. Further, the object is then buoyed up by a buoyancy force of 8 lb. Find the velocity of the object 2 seconds after it passes beneath the surface of the lake.
A particular guitar string is supposed to vibrate at 203 Hz, other than it is measured to actually vibrate at 208 Hz. By what percentage must the tension in the string be changed to get the frequency to the correct value.
Considering Wiener's experiment (fig. 7.14) in monochromaticlight of wavelength 550nm, determine the number of bright bands per centimeter that will appear on it
A 15-g ball is shot from a spring gun whose spring has a force constant of 600N/m. The spring can be compressed 5 cm. How high can the ball be shot if the gun is aimed vertically
your physics teacher is holding a spinning wheel with angular momentum of 8 units upward while standing on a stationary
Use the worked example above to help you solve this problem. A cylinder contains2.15mol of helium gas at19.0°C. What is the average kinetic energy per molecule
A basketball player has free throws from the foul line. The center of the basket is a horizontal distance of 4.21 m from the foul line and is a height of 3.05 m above the floor. At the maximum height, how far is the ball horizontally from the baske..
A 190 g ball moving at 0.45 m/s in the + x- direction is subject to a 0.15 N force in the - y- direction for 2.5 s. Find the magnitude of the ball's momentum change
A small glass bead has been charged to +30.0nC. A metal ball bearing 1.30cm above the bead feels a 1.90×10?2N downward electric force. What is the charge on the ball bearing?
A soccer ball is kicked with an initial horizontal velocity of 19.0 m/s and an initial vertical velocity of 13.0 m/s. How far from where it was kicked will the ball land
W hat is the magnitude of an average force exerted on the superball by the sidewalk. what is force caused by the water on the bottom.
The magnitude of the force exerted by a spring is given by F = kx where x is the amount of stretching/compressing of the spring. What must be the units associated with k expressed in terms of fundamental SI units?
A mass m=4.8kg hangs on the end of a massless rope L=1.92m long. The pendulum is held horizontal and released from rest. what is the maximum mass that can be used
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