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A small 2-kg collar C can slide freely on a thin ring of mass 3 kg and radius 250 mm. The ring is welded to a short vertical shaft, which can rotate freely in a fixed bearing. Initially the ring has an angular velocity of 35 rad/s and the collar is at the top of the ring (θ= 0) when it is given a slight nudge. Neglecting the effect of friction, determine
(a) the angular velocity of the ring as the collar passes through the position θ = 90°,
(b) the corresponding velocity of the collar relative to the ring.
A dodgeball with mass 594.9 g is thrown directly at him with a speed of 22.43 m/s. He catches the dodgeball and then moves with a speed of 0.2635 m/s. What is the mass of the boy
Three point charges, -5.2 x 10-9 C, -8.1 x 10-9 C, and +7.7 x 10-9 C, are fixed at different positions on a circle. The total electric potential at the center of the circle is -2300 V
The makers of Taster's Choice instant coffee want to estimate the proportion of underfilled jars of a given size. The jars are in 14 warehouses around the country, and each warehouse contains crates of cases of jars of coffee.
An elevator is traveling upward at constant speed of 2.4 m/s. After 2.4 s has passed, the distance between the object and the elevator is
What is the friction force that acts on the bear?
A 7 kg sled is initially at rest on a horizontal road. The sled is pulled a distance of 2.8 m by a force of 45 N applied to the sled at an angle of 30o to the horizontal. Find the change in the kinetic energy of the sled
What is the distance between these two positions? (cm)
A car is hauling a 92 kilogram trailer, to which it is connected by a spring. The spring constant is 2300 N/m. The car accelerates with an acceleration of 0.30 m/s2. Obtain how much the spring stenches
Two parallel wires are each carrying 10 A and are separated by 4.0 m. If the currents are in opposite directions, what is the magnitude of the magnetic field halfway between them?
charges of 6.0 x 10-7 c are each located at three corners of a square that is 1.0 m on each side. a charge of -1.3 x
Cobalt has a density of 8.9 g/cm3 and molecular mass of 58.9 g/mol. Calculate the magnetic moment of a cobalt atom in Bohr magnetons
A wheeled cart is shoved up an inclined plane with an unknown initial speed. What was the cart's initial speed
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