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An athlete does the 100 m dash. If observers on a spaceship moving with a speed of 0.741c relative to Earth see the athlete's run and measure his time to be 15.74 s, find the time that was recorded on Earth. In seconds
A 4.6 long, 480 steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction.
A 70-kg climber is hanging by a rope off the edge of a cliff, with the top end of the rope tied to a 200-kg rock. However, the rock is sitting on an icy horizontal surface,
At some distance from a point charge, the electric potential is 618.0 V and the magni- tude of the electric field is 160.0 N/C. Determine the distance from the charge
Having taken a nap under a tree only 20 m from the finish line, Rabbit wakes up to find Turtle 19.5 m beyond him, grinding along at 1/4 m/s. If the bewildered hare can accelerate at 9 m/s2 up to his top speed of 16 m/s (36 mi/h) and sustain that s..
The 1.20kg head of a hammer has a speed of 8.1m/s just before it strikes a nail and is brought to rest. Estimate the temperature rise of a 14gg iron nail generated by 5.0 such hammer blows done in quick succession
A uniform rod is attached to a wall by a hinge at its base. Determine the horizontal and vertical components of the force exerted on the rod by the hinge
A nut is held in the jaws of a pair of pliers. The nut is 25 mm from the pivot of the pliers and a force of 10 N is applied to each handle 150 mm from the pivot
If you put a 0.28 kg mass 15 cm from the axis of a massless disk, and you apply a 0.4 N force on a string wrapped at the disk's edge, what is the resulting angular acceleration
As part of the safety investigation, two 1400 {rm kg} cars travelling at 23 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.7 {rm s} to stop, and (b) car that hits..
An airplane is flying with a velocity of 93.0 m/s at an angle of 25.0 degrees above the horizontal, How far from the dog will the suitcase land in m
A skier of mass 70kg is pulled up a slope by a motor driven cable. the work required to pul him 60m up a 30 degrees slope, What horsepower must a motor have to perform this task
You have three identical charged spheres, each with a charge of 4.10 µC. Find the magnitude of the electric field at the "empty" corner
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