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The outfielder throws a baseball with an initial speed of 10 m/s. An infielder catches the ball at the level 1 m lower and its speed at that moment is 6 m/s. what work is done by air resistance? The mass of the ball is 0.27 kg.
An iron rod of diameter 2.6 cm and length 80.0 cm is to be inserted inside a long solenoid to make an electromagnet. how many turns of wire will be needed for the solenoid
Moon effect. Some people believe that the Moon controls their activities. By what percent does your weight (as measured on a scale) decrease
If the activation energy for the vacancy formation is given as 0.77 eV for aluminium at (650 degrees Celcius) ^3, what would be the number of vacancies at 650 degrees Celsius? The atomic weight and the density of aluminium is 26.98 g/mol and 2.62 ..
A uniform solid disk with a mass of 45.00 kg and a radius of 0.393 m is free to rotate about a frictionless axle. Forces of 90.0 and 125 N are applied to the disk.
An object undergoes simple harmonic motion with a period of 0.015 s, and an amplitude of 1.2E-2 m. What's the fastest the object travels during its motion
A helium balloon ride lifts up passengers in a basket. Assume the density of air is 1.28 kg/m3, find the volume of helium in the balloon when fully inflated
A molecule of water vapor causes an electricfield in the surrounding space as if it were an electricdipole. Derive an expression for the electric field due to an electric dipole at a point P at a distance z from thecenter of the dipole
Two locomotives approach each other on parallel tracks. Each has a speed of v = 95 km/h with respect to the ground. how long will it be before they reach each other
A car is stopped at a traffic light. When the light turns green it accelerates at 2.5 m/s2 for 16 seconds. How many seconds does it take from start to stop
An object weighing 300 N in air is immersed in water after being tied to a string connected to a balance. find the density if the object and the oil
With a particular grating a doublet of the two wavelengths 731.3 and 732.1 nm is viewed in the third order at 9.3° to the normal, find the grating spacing in nanometers
Driving home from school one day you spot a ball rolling out into the street. You brake for 1.30 s, slowing your 840 kg car from 16.0 m/s to 9.50 m/s. How far did you travel while braking
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