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A 250 g weight is tied to a piece of thread wrapped around a spool, which is suspended in such a way that it can rotate freely. When the weight is released, it accelerates toward the floor as the thread unwinds.
Assume that the spool can be treated as a uniform solid cylinder of radius R=3 cm and mass Ms=300 g. Find the tension in the thread and the magnitude of the acceleration of the weight as it descends. Assume the thread has negligible mass and does not slip or stretch as it unwinds.
A uniform 1.4 kilogram rod that is 0.75 meter long is suspended at rest from the ceiling by two springs, one at each end of the rod. Compute the angle that the rod creates with the horizontal
An electron is confined to a one-dimensional region in which its zero-point (n = 1) energy is 2.90 eV. What is the length of the region
Typical field strengths are a few femoteslas (1fT=10^-15T). An adult brain is about 140mm wide, A reasonable magnetic field is 4.35fT at the sensor. According to this model, what is the current in the brain?
A tennis ball is hit with a vertical speed of 30 m/s and a horizontal speed of 25 m/s. How long will the ball remain in the air? How far will it travel horizontally during this time?
a 6-lb block is attached to a cable and to a spring vertically the cable above and the spring below. the spring
A 50 Ω resistor is connected in series with a 15 μFcapacitor and a 60 Hz, 120 V source. What value inductor must be inserted in the circuit inorder to reduce the current to one-half that found in a
The sensitivity of a measuring instrument is the value of the smallest quantity that can be read or estimated with it. What is the smallest part of a centimeter that can be read
A small object is 10 cm to the left of a converging lens (f = +5 cm), Find the position and magnification of the final image by calculation
A stiff wire 38.0cm long is bent at a right angle in the middle. One section lies along the z axis and the other is along the line y=2x in the xy plane. Determine the magnitude and direction of the total force on the wire
A car drives north at 48 for 10 and then turns east and goes 5 at 62 . Finally, it goes southwest at 24 for 6. Determine the cars displacement.
A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 4.1 rad/s; 45 radians later, its angular speed is 16 rad/s. Calculate (a) the angular acceleration (rad/s2), (b..
blocks with masses of 1kg 3kg and 5kg are lined up in a row on a frictionless table. all three are pushed forward by
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