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Some asteroid fragments are large enough to not completely burn up in the atmosphere and they end up on the surface of the Earth. It is possible for such a fragment to be radioactive. What is the chief cause of radioactivity?
As structural steel rod has a radius R = 9.5 mm and a length L = 81 cm. A force F = 6.2 × 104 N (about 7 tons) stretches it along its length. What is the tensile stress in the rod
A 230-N child is in a swing that is attached to ropes 1.90m long. Find out the gravitational potential energy associated with child relative to her lowest position at the following times.
A bicycle wheel of radius 0.30m is spinning at a rate of 60 revolutions per minuit. What is the period of the wheels motion
398 g of water at 64°C is added to ice at 0°C. If the final temperature of the system (which you can assume is isolated) is 0°C, determine how much ice melted
When a uniform electric field directed horizontally (from left to right) is introduced, equilibrium is eventually established with the mass hanging at an angle
A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 6.7 cm between the two windows. What now is the rate of energy loss
The train on the right accelerates leftward at 0.82 m/s2.How far does train on the left travel before the front ends of the trains pass.
Two carts with masses of 12.5 kg and 4.5 kg, respectively, move in opposite directions on the frictionless horizontal track with speeds of 8 m/s and 5 m/s, respectively. The carts stick together after colliding head-on. Find the final speed of the..
q1. the escape speed from a very small asteroid is only 26 ms. if you throw a rock away from the asteroid at a speed of
The discovery of a star orbiting the center of our galaxy with a 15-year period has led to the finding, calculate the semimajor axis of the star's orbit
a stationary orbit is done with a period equal to the time it takes the planet to revolve one time so that the satellite appears to remain at the same point in the sky all the time. Find the radius of a stationary orbit
The length of an air column that produces a strong resonance in a cylinder is 0.18m, what is the frequency of the tuning fork being used .
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