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The distance of an object from a startin gpoint is given by s(t)=5t^2-9t+90, where t is time in seconds. A. Determine the average velocity of the object from 2 seconds to 4 seconds.
An object whose mass is 4 kg is at a radius of r = [ ( -5 i + 3 k ) m ]. Gravity is in the direction of [- j ]. What is the torque produced by gravity
A point charge (m = 1.0 g) at the end of an insulating string of length 53 cm (Fig. 16-66) is observed to be in equilibrium in a uniform horizontal electric field of E = 9500 N/C, when the pendulum's position is as shown in Fig. 16-66, with the charg..
the coil of a generator has a radius of 0.17 m. when this coil is unwound the wire from which it is made has a length
A copper wire and a gold wire of equal diameters and of equal lengths are connected in parallel. Together they carry a current of 8.0 A. What is the current in each of the two wires?
A tractor pulls a sled of mass M = 1375 kg across level ground. The coefficient of kinetic friction between the sled and the ground is ?k = 0.605, What magnitude of tension in the rope is necessary to move the sled horizontally
A 12.5 Kg block lies on a 30.0 degree incline. A rope connects the block to the upper end of the incline. The rope is parallel to the incline. what is the wave speed of waves on the rope
Bats can detect small objects such as insects that are of a size on the order of a wavelength. determine the smallest size insect they can detect
Suppose a block with mass 2.80 kg is resting on a ramp. If the coefficient of static friction between the block and the ramp is 0.440, Find the maximum static friction force that acts on the block
a simple atwoods machine uses two masses m1 and m2. starting from rest the speed of the two masses is 9.0 ms at the end
A person holds a book 25 cm in front of the effective lens ofher eye; the print in the book is 1.5mm high. what is the size (including the sign) of the print image on the retina
What is in diopters the power of that lens? What is in meters the focal length of the lens needed to correct for the myopia? Express your answer in meters.
Two stars are 2.1 Ã- 1011 m apart and are equally distant from the earth. Find the maximum distance that these stars could be from the earth
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