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Q. A uniform plank of length 5.0 m and weight 231 N rests horizontally on two supports, with d = 1.43 m of the plank hanging over the right support. To what distance, x, can a person who weighs 446 N walk on the overhanging part of the plank before it just begins to tip?
Q. A 48 kg pole vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 0.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
What fraction of incident intensity is transmitted by system
Discover new angles with respect to the x-axis
With the power supply disconnected, the dielectric material is removed and the potential difference between the plates is measured to be 500 V. What is the dielectric constant of the material that was at first used to fill the gap between the plates.
You and a friend each drive 67 km. You travel at 88.1 km/h, your friend at 952.6 km/h. How long would your friend wait for you at the end of the trip.
What tension is necessary to tune string properly
What are the velocities of the two people after the snowball is exchanged. What is the greatest kinetic energy of the electrons removed from the cathode by this light.
When a second pipe is played at the same time, a 1.40 Hz beat note is heard. By how much is the second pipe too long.
Using the equation F=m v^2/r for a force an object in circular motion. Find the radius r of motion of a m=1.6 kg ball travelling in a circular path acted upon by a centripetal force F=7N.
A dynamite blast at a quarry launches a rock straight upward, and later it is rising at a rate of 15m/s. Assuming air resistance has no effect on the rock, calculate the total time the rock is in the air.
A small, 300 {rm g} cart is moving at 1.30 {rm m/s} on an air track when it collides with a larger, 3.00 {rm kg} cart at rest. After the collision, the small cart recoils at 0.890 {rm m/s}.
How much time is spent in pushing the mower
What is a density of the block
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