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A car heading north collides with an identical car heading east at an intersection. Both cars have the same speed. If they lock together and travel at 28m/s at 46 degrees north of east just after the collision, how fast was the car initially traveling? Assume that any other unbalanced forces are negligible.
Answer 40m/s
What equations would you use for parabolic motion equations such as for horizontal motion, and for verticle motion
In a chase scene, a movie stuntman runs horizontally off the flat roof of one building and lands on another roof 2.1m lower. If the gap between the buildings is 4.8m wide, how fast must he run to just barely cross the gap? In other words, what is his..
The electron gun in a television tube uses a uniform electric field to accelerate electrons from rest to 4.3×107 m/s in a distance of 1.4 cm. Determine what is the electric field strength? (In units N/C)
A 7.80 gram bullet moving at 460 m/s penetrates a tree trunk to a depth of 4.4 centimeter. Use work and energy considerations to determine the average frictional force that stops the bullet
An electron in hydrogen emits a photon with a wavelength of 12.4 um and ends up in the n=6 state. What is the initial state of the atom
Suppose the nucleus of the hydrogen atom were enlarged to the size of a baseball (diameter = 7.3cm). At what typical distance from the center of the baseball would you expect to find the electron?
The population of a community was 12500 in 1985 and 36000 in 2000. Find the time it takes the population of this town to double
A loop of area 0.25 m2 is in a uniform 0.02 T magnetic field. What angle does the normal to the plane of the loop make
A bullet is fired through a board 10.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of the board. The initial speed of the bullet is 400 m/s and it emerges from the other side of the board with a speed of 30..
A string trimmer is a tool for cutting grass and weeds; it utilizes a length of nylon "string" that rotates about an axis perpendicular to one end of the string. What is the length of the rotating string
A person lifts a 5kg cement block a vertical distance of 2.3m and after that aeries the block horizontally a distance of 6m. Determine the work completed by the person and by the force of gravity in this process.
Write a symbolic equation for horizontal position of the center of mass relative to the left vertex of triangle. Find the numeric value of the location of the horizontal component of the center of mass relative to the left vertex in cm.
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