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A small object is released from rest and falls 1.00 x 10^ 2 feet near the surface of the earth. Neglect air resistance. How long will it take to fall through the 1.00 x 10^2 feet mentioned?
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A ball is thrown straight up with an initial speed of 30 m/s. How long will it take to reach the top of its trajectory, and high will the ball go? A car slows to a stop with an average acceleration of - 2.5 m/s2. How lon ...
A cheetah can run very quickly over short distances. Assume a cheetah has a constant velocity of 33.0 m/s and is approaching a gazelle that is initially at rest. When the cheetah is 90 m away, the gazelle begins to run w ...
Question: A textbook of mass 2.09kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.120m , to a hanging book with mass 2.99kg . The system is released fro ...
The total length of the blood vessels in the body is roughly 500,000 km. Most of this length is due to the capillaries, which have an average diameter of 12 um. Estimate the total volume of blood in the human body by ass ...
Question: One of the most worrisome waste products of a nuclear reactor is plutonium 239 ( 239 Pu). This nucleus is radioactive and decays by splitting into a helium-4 nucleus and a uranium-235 nucleus ( 4 He + 235 U), ...
Question: In this problem we will consider a collision of two moving objects such that after the collision, the objects stick together and travel off as a single unit. The collision is therefore completely inelastic. You ...
A ski jumper leaves the ski track moving in the horizontal direction with a speed of 15.0 m/s. The landing incline below her falls off with a slope of 45.0 degrees. Where does she land on the incline?
Question: The starter motor of a car engine draws a current of 170 A from the battery. The copper wire to the motor is 5.80 mm in diameter and 1.2 m long. The starter motor runs for 0.670 s until the car engine starts. A ...
Question: A thin, horizontal, 20-cm-diameter copper plate is charged to 4.0 nC . Assume that the electrons are uniformly distributed on the surface a) What is the strength of the electric field 0.1 mm above the center of ...
Questin: A research submarine has a 30-cm-diameter window that is 9.0cm thick. The manufacturer says the window can withstand forces up to 1.2*10^6N . What is the submarine's maximum safe depth in salt water? The pressur ...
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