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An aluminum rod is 20.0 cm long at 20°C and has a mass of 350 g. If 12,500 J of energy is added to the rod by heat, what is the change in length of the rod?
A 5.00g bullet is fired horizontally into a 1.30kgwooden block resting on a horizontal surface. What was the initial speed of the bullet
the speed with which hair or fingernails grow. what is the average speed of growth? What units are most appropriate for describing this speed
A planet orbits a star once every 3.44 multiply.gif 107 s in a nearly circular orbit of radius 1.46 multiply.gif 1011 m. determine the tangential speed of the planet
After being accelerated through a potential difference of 5.42 kV, a singly charged carbon ion (12C) moves in a circle of radius 20.8 cm in the magnetic field of a mass spectrometer. What is the magnitude of the field
Suppose that electrical energy costs about $0.098/(kW · hour), If the electric potential provided by the electric company was 120 V, what was the average current in all circuits in the author's house
A 120 kg mail bag hangs by a vertical rope 4.00 m long. A postal worker then displaces the bag to a position 2.10 m sideways from its original position, always keeping the rope taut.
A photographer uses his camera, whose lens has a 50 mm focal length, to focus on an object 3.5m away. How far must the lens move to focus on this second object
A 50.0-kg child on a 2.0 m long swing is released from rest when the swing supports make an angle of 30 degrees with the vertical. find the potential and kinetic energies of the child
A rocket is launched from rest with an acceleration of 30m/s^2 for the duration of one second when it runs out of fuel. What is the max height of the rocket
A straight, nonconducting plastic wire 8.50 cm long carries a charge density of +175 nC/m distributed uniformly along its length, Find the magnitude and direction of the electric field
A rifle is aimed horizontally at a target 50 m away. The bullet hits the target 2.0 cm below the aim point. What is the bullet's flight time
A Hydrogen atom has one proton in the nucleus and one electron in the shell. In a classic model of the atom, What is the radius of the orbit
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