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An aluminum wirehaving a cross-sectional area equal to3.1010-6m2carries a current of8.00A. The density of aluminum is 2.70 g/cm3. Assume each aluminum atom supplies one conduction electron per atom. Find the drift speed of the electrons in the wire.
A helicopter lifts a 72 kg astronaut 19 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/12. How much work is done on the astronaut
An archer shoots an arrow at a 78.0 m distant target, the bull's-eye of which is at same height as the release height of the arrow. At what angle must the arrow be released to hit the bull's-eye if its initial speed is 38.0 m/s
A cannonball is shot (from ground level) with an initial horizontal velocity of 40 m/s and an initial vertical velocity of 29 m/s, What is the initial speed of the cannonball
what is the rate of heat transfer from the plate to the air? If the free stream velocity if the air is doubled and the pressure are increased to 10 atm, what is the rate of heat transfer.
A 2.0x10^-9 C point charge is located at x=3 cm, Determine the force on the negatively charged object due to the positively charged object
Two point charges, +4.30 ?C and -8.90 ?C, are separated by 2.70 m. What is the electric potential midway between them
A simple pendulum has a length L and a mass m. At its highest point, the pendulum mass is 0.25L above its lowest point. What is the speed of mass when it is at its lowest point
A 3.80 m-long, 430 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66.0 kg construction worker stands at the far end of the beam. What is the magnitude of torque abou..
A man drags a 75.0-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. Find the magnitude of the tension in the strap
A forensic scientist is using a standard biological microscope with a 1x objective and a 5x eyepiece to examine a hair from a crime scene. How far from the objective is the hair? Assume that the length of the tube of a standard biological microscope ..
The larger molecule HI has a bond length of 160.92 pm (H=1, I=127). its bond's force constant is 314 N/m. what are the frequencies of light for that will excite the lowest energy rotational and vibrational translations
A spring with spring constant 250 N/m is compressed by 0.13 m and then used to propel a 0.035-kg ball directly upward. If needed, use g = 10 m/s2. what is the height of the ball at it's peak
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