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A child loses his balloon, which rises slowly into the sky. If the balloon is 14 cm in diameter when the child loses it, what is its diameter at the following altitudes? Assume that the balloon is very flexible and so surface tension can be neglected.
(a) 1100 m
(b) 1800 m
(c) 5000 m
A car with mass of 1000.0 kg accelerates from 0 m/s to 40.0 m/s in 11.0 s. What is the average mechanical power output of the engine
question1an automobile having a mass of 1000 kg is driven into a brick wall in a safety test. the bumper behaves like a
The mean lifetime of stationary muons is measured to be 2.2 µs. Find the speed of these cosmic-ray muons relative to Earth
A skier of mass 68.4 kg glides down a hill of slope 26.5 degree at constant speed. If she travels a distance 35.0m down the hill, what is (a) the work done by friction and (b) the coefficient of friction between her skis and the slope?
In the figure, a laser beam of power 5.10 W and diameter 2.20 mm is directed upward at one circular face (of diameter less than 2.20 mm) of a perfectly reflecting cylinder, What is the cylinder's height
What is the mass in kg of the air in a scuba tank that has an internal volume of 0.01 m3 and it is pressurized o that the density of the air in the tank is 240 kg/ m3
A racecar approaches the start/finish line of a race track with a speed of 100 m/s. A speaker (called the ground speaker) next to the start/finish line emits a tone of frequency 256 Hz (middle C on a piano). A second speaker on the racecar (called..
A grating spectrometer is used to resolve third order peaks from two wavelengths of ?1 = 455.00 nm, What is the minimum number of slits this grating must have
Coherent light from a sodium-vapor lamp is passed through a filter that blocks everything except for light of a single wavelength. compute the wavelength of the light that falls on the slits
An electromagnetic plane wave at a certain location has an electric field pointed up which is given as a function of time as E = 54 V/m × sin (6x106 Hz × t). What is the Poynting vector at this location for this wave as a function of time
find the angular displacement of the propeller.
Most of the motion generated by joints in the human body are examples of levers. what force is exerted by the biceps muscle
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