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Suppose an ice skater, such as the one in the figure, is spinning at 0.764 rev/s with her arms extended. She has a moment of inertia of 2.34 kg ⋅ m2 with her arms extended and of 0.363 kg ⋅ m2 with her arms close to her body. (These moments of inertia are based on reasonable assumptions about a 60.0-kg skater.) What is her angular velocity in revolutions per second after she pulls in her arms?
An investigator collects a sample of a radioactive isotope with an activity of 4.4×105Bq . 72hourslater, the activity is 1.2×105Bq. What is the half-life of the sample
Someone throws a rock at a clock 5 meters away from them. The rock is thrown at a height of 120cm. The velocity that it reaches is 25 m/s. By how much did she miss the center of the clock
An astronaut who is repairing the outside of her spaceship accidently pushes away a 98.9-cm-long steel rod, which flies off at 10.5 m/s, never to be seen again. As it happens, the rod is oriented perpendicularly to the magnetic field in that region o..
a horizontal desk surface measures 1.85 m x 1.48 m. if earths magnetic field has magnitude 0.436 mt and is directed
Calculate the minimum amount of energy, in joules, required to completely melt 135 g of silver initially at 28.0°C. The melting point of silver is at 962°C
What is the tangential acceleration of a bug on the rim of a 13.0-in.-diameter disk if the disk accelerates uniformly from rest to an angular speed of 76.0 rev/min in 4.60 s? 0.29 m/s2
A stone is projected horizontally with a speed of 4 m/s from a bridge 6 m above the river. What is the distance from the bridge when the stone falls into the river?
The deflection in the moving coil galvanometer is reduced to half when it was shunted with a 40 ohm coil. The resistance of the galvanometer is what
Two pole-vaulters just clear the bar at the same height. Thefirst lands at a speed of 7.07 m/s, while the second lands at aspeed of 7.50 m/s. The first vaulter clears the bar at a speed of1.92 m/s.
A wall is formed of two identical panels that enclose air space. The thickness of the panels is lp = 0.02 m and that of the air space is la = 0.04 m.
A. Four charged particles are arranged in a diamond around the origin. What is the electric field at the origin. Is it surprising that it is not zero?
Red light of wavelength 700 nm in vacuum enters diamond (n=2.4). The wavelength of light inside the glass is now
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