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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.
Imagine a game of tug of war where the winner must move the middle of the rope 1 meter in their direction. What was the work performed by the loosing team as they lost
A projectile is fired horizontally from a gun that is 48.0 m above flat ground, emerging from the gun with a speed of 280 m/s. How long does the projectile remain in the air
A 1000- kg car collides with a 1200- kg car that was initially at rest at the origin of an x-y coordinate system. What was the initial speed of the lighter car (in km/h)
A wheel of radius 0.350 m has an initial angular speed of 54.0 rad/s and is brought uniformly to a stop after undergoing 28.0 complete rotations. Calculate the angular acceleration of the wheel.
Suppose that the specific heat capacity cp Of the body discussed in Section 7.6 of the text is 10 J kg-1 K-1and T1 =200 K. Find the entropy change of the universe in both cases
A block of the same weight as the meter stick is suspended from the stick, as shown, at a distance x from the wall. What is the minimum value of x for that the stick will remain in equilibrium.
A 3.00-UF capacitor is fully charged by a 12.0-V battery. The two ends of this fully charged capacitor are then connected to the two ends of a 6.0-mH inductor, find the maximum current and rms current
A 0.29 micro farad capacitor is connected across an AC generator that produces a peak voltage of 10.4 V. What is the peak current through the capacitor
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. find the initial angle of the ball with respect to the ground
A long straight wire has fixed negative charge with a linear chargedensity of magnitude 4.0 nC/m. The wire isto be enclosed by a coaxial, thin-walled, nonconducting cylindricalshell of radius 1.6 cm.
One generator uses a magnetic field of 0.15 T and has a coil area per turn of 0.050 m2. What magnetic field should be used in the second generator, so that its peak emf is the same as that of the first generator
Two 1.0 g beads, each charged to +5.0 nC, are 2.0 cm apart. A 2.0 g bead charged to -10 nC is exactly halfway between them. What are the speeds of the positive beads
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