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A 1kg ball is falling to the floor. When it is 0.7m above thefloor, it's potential energy exactly equals its kinetic energy. Howfast is it moving? What is its speed when it reaches the ground?
For a movie scene, a 75kg stuntman drops from a tree onto a 55kg sled that is moving on a frozen lake with a velocity of 15m/s toward the shore. What is the speed of the sled after the stuntman is on board
The speed of an arrow fired from a compound bow is about 29 m/s. An archer sits astride his horse and launches an arrow into the air elevating the bow at an angle of 35 degrees above the horizontal, What is the arrow range
An LED’s color is determined by the energy needed to shift an electron across the band gap in the semiconductor from which the LED is made. Because blue photons have more energy than green photons, the development of blue LEDs has been slow. The mate..
Compute the rms speed of a nitrogen molecule at 12.0°C and At what temperature will the rms speed be half that value
A 1000 kg experimental rocket sled on a level frictionless rail is loaded wiht 50kg of propellant. It exhausts the propellant in a 20-s "burn". If rocket, initially at rest, moves at 150m/s after the burn, what impulse is experienced by the rocket..
Two positive point charges q1 = 12C and q2 = 48C are a distance 0.25 m apart. Find all the points where the total electric field is zero
A point charge q1=4nC is placed at the origin, and a second point charge q2= -3nC is placed on the x-axis at x= 20 cm. A third point charge q3=2.00 nC is to be placed on the x-axis between q1 and q2.
Determine the maximum load in terms of theta_min and other quanitites given in the problem introduction.
A uniform solid disk of radius 1.60 m and mass 2.30 kg rolls without slipping to the bottom of an inclined plane. what is the height of the inclined plane
You toss a ball straight up in the air. Immediately after you let go of it, what forces are acting on the ball
Two long, parallel conductors carry currents I1 = 3.00 A and I2 = 2.50 A, both directed into the plane of the computer screen. Determine the magnitude and direction of the resultant magnetic field at P.
A 98.0-g wooden block is initially at rest on a rough horizontal surface when a 12.6-g bullet is fired horizontally into it, determine the speed of the bullet immediately before impact
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