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Q1. A 0.20 {rm kg} rock is thrown vertically upward from the top of a cliff that is 31.0 {rm m} high. While it hits the ground at the base of the cliff, the rock has the speed of 31 {rm m/s}. Assume that air resistance can be ignored; find the initial speed of the rock.
Q2. A small motor boat is capable of maintaining a 9.00 m/s speed in still water. It attempts to cross a long straight 0.60 km wide river that has a constant 3.60 m/s current.
What is an approximate absorbed dose rate in Gy per day in water at the center of the bucket if 163 atoms of Cs-137 disintegrate per g s? Use the straight-ahead approximation and mean-radius method of calculating the photon dose. Give the answers for..
What was the absorbed dose in the carbon walls? The average mass stopping powers of graphite and CO2 for the photons are, respectively, 1.648 and 1.680 MeV cm^2/g.
A rotating cylinder about 16 {rm km} long and 6.8 km in diameter is designed to be used as a space colony. With what angular speed should it rotate so that the residents on it will experience the same acceleration due to gravity as on Earth.
Find a largest image that can be completely imaged on a 35mm film.
Find out an average acceleration of the motorcycle
A uniform density cube of mass m, side 2b, and center at C is placed on a fixed horizontal cylinder of radius r and center O in Earth's gravitational field. The cube is originally put so that C is centered above O, but it can roll from side to side w..
How much work did the movers do (horizontally) pushing a 150- crate 10.2 across a rough floor without acceleration, if an effective coefficient of friction was 0.50.
Determine the power distribution in carrier and sidebands if the transmitted power is 1,000 W and mf = 1.
What's the advantage of launching space vehicles from high flying aircraft in place of from the ground.
Suppose a uniformly charged (with a linear charge density) wire starts at point 0 and rises vertically along the positive axis to a length. Determine the x-component of the electric field at point. That is, compute near one end of a long wire, in the..
A 68.0 kg person escapes from a burning building by jumping from a window 25m above a catching net. Assuming that air resistance exerts a 95N force on the person during the fall, determine the person's velocity just before hitting the net.
What will be its length and height at rest
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