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A spherical weather balloon is filled with hydrogen until its radius is 3.40 m. Its total mass including the instruments it carries is 11.0 kg.
(a) Find the buoyant force acting on the balloon, assuming the density of air is 1.29 kg/m3.
_________N
(b) What is the net force acting on the balloon and its instruments after the balloon is released from the ground?
Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude? (Overlook any effects that might be caused by interstellar dust and gas.)
The rms electric field of an electromagnetic wave increases from 286 to 858 N/C.find the wave intensities for the two values of the electric field.
Estimate, from these data, the effective distance between the atoms.
Starting from rest with an acceleration of 0.37 m/s2, he covers the same distance as the ramp does, but in one-fourth the time. Illustrate what is the speed at which the belt of the ramp is moving?
An iron wire has a cross-sectional area of 1.14 10-5 m2. Carry out steps (a) through (e) to compute the drift speed of the conduction electrons in the wire, If the wire carries a current of 9.0 A, calculate the drift speed of conduction electrons
At one instant, a 19.0-kg sled is moving over a horizontal surface of snow at 5.00 m/s. find the magnitude of the average friction force acting on the sled while it was moving
determine the time the inhabitants of alpha station. A woman who weighs 600N at earth's surface stands on top of a very tall ladder so she is one earth radius above earth's surface. how much does she weigh.
The power required by an ice maker is 225 W and is the rate at which it does work. The ice maker operates like a refrigerator or an air conditioner and has a coefficient of performance of 3.60.
A 900- kg car collides with a 1300- kg car that was initially at rest at the origin of an x-y coordinate system. What was the initial speed of the lighter car (in km/h)
In a college homecoming competition, eighteen students lift a sports car. Though holding the car off the ground, each student exerts an upward force of 390 N. What is the mass of the car in kilograms? What is its weight in pounds.
A sound wave generated by a source of frequency 440 Hz is moving through 25 oC air. What is the wavelength of the sound wave inside the steel
Find the electric field (in N/C) at the position of the electron.
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