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A pulley of 5.0cm radius, on a motor, is turning at 30 rev/sand slows down uniformly to 20 rev/s in 2.0s. Calculate
(a) the angular acceleration of the motor,
(b) the number of revolutions itmakes in this time, and
(c) the length of belt it winds in this time.
It is common to see birds of prey rising upward on thermals. The paths they take may be spiral-like. You can model the spiral motion as uniform circular motion combined with a constant upward velocity. Assume a bird completes a circle of radius 6...
a metal sphere of radius 23 cm has a net charge of 9.0 x 10-8 c.a what is the electric field at the spheres surface?b
A uniformly accelerated car passes three equally spaced traffic signs. The signs are separated by a distance d = 25 m. The car passes the first sign at t = 1.3 s, What is the magnitude of the acceleration of the car
develop a hypothesis for how kernel color is inherited . the hypothesis should includea number of genes involvedb
A helium atom (m= 6.6465 x 10^-27 kg) collides elastically with an oxygen atom (m = 2.6560x10^26kg) at rest. Find the speed of the oxygen atom
Large meteorites are hardly slowed by Earth's atmosphere. how long does it take to reach the ground
A viewing window on the side of a large tank at a public aquarium measures 42 in. by 52 in. What is the total outward force on the window
A parallel-plate capacitor in air has a plate separation of 1.59 cm and a plate area of 25.0 cm2. obtain the charge on the plates before and after immersion
A thin gold ring of radius 1.11 cm carries a uniform charge per unit length of 1.1e-14 C/m. Find the electric field on the axis of the ring
A crate of eggs is located in the middle of the flat bed of a pickup truck as the truck negotiates a curve in the flat road, how fast can the truck be moving without the crate sliding
An emf is induced in a conducting loop of wire 1.11m long as its shape is changed from square to circular.Find the average magnitude of induced emf if the change in shape occurs in 4.03s and the local 0.135-T magnetic field is perpendicular to the ..
What is a galaxy rotation curve and describe the rotational curve for the Milky Way? How does the shape of the curve indicate the presence of dark matter?
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