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Mary and Sally are in a foot race. When Mary is 22mfrom the finish line, she has a speed of4.0m/sand is5.0mbehind Sally, who has a speed of5.0m/s.Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at a constant rate of 0.38m/s2to the finish line.
What constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side-by-side with Sally?
A Ferris wheel is moving at an initial angular velocity of 1.0 rev/39 s. If the operator then brings it to a stop in 3.3 min, what is the angular acceleration of the Ferris wheel
A 1.10 kg mass is attached to a spring of force constant 9.5 N/cm and placed on africtionless surface. By how much will the spring stretch if the mass moves along a circular path of radius 0.530 m at a rate of 2.20 revolutions per second?
a 9.5-kg monkey is hanging by one arm from a branch and is swinging on a vertical circle. as an approximation assume a
A singly charged ion of mass m is accelerated from rest by a potential difference ?V. What is the ratio of the masses of the ions
Brian is trying to pull Julie on a sled across a flat snowy field. Brian pulls on a rope attached to the sed. His pulling force is directed forward and upwards at a 30 degree angle above horizontal. Julie's mass is 50kg and the sleds mass is 8kg. If ..
Consider an object on an incline where friction is present. The angle between the incline and the horizontal is ?, Find an expression for the acceleration of this object. Treat down the incline as the positive direction
A probe in deep space is infested with alien bugs and must be blown apart so that the icky creatures perish in the interstellar vacuum. What is the velocity of the second piece after the explosion
If the exospheric temperature is 1500 K and the hydrogen atom and helium atom densities at 500 km are 10^4 cm^3 and 10^6 cm^3 respectively,
Two small non conducting spheres have a total charge of 85.2. When placed 1.09 apart, the force each exerts on the other is 10.4 and is repulsive. What is the charge on each.
A very large loop of metal wire with radius 1meter is driven with a linearly increasing current at a rate of 200amps/second. What is the separation between the loops
hen an object is placed 69.0 cm from a certain converging lens, it forms areal image. When the object is moved to 37.0 cm from the lens, the image moves26.0 cm farther from the lens.Find the focal length of this lens (cm)
A 3.7-m-tall, 60-cm-diameter concrete column supports a 2.0×10^5 load. By how much is the column compressed
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