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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 13.0 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? N (c) Why does the radius of the balloon tend to increase as it rises to higher altitude? Because the external pressure with increasing altitude.
what is Spectroscopic and Photometric Parallaxes ? Define specific heat capacity and thermal capacity.
Two ice-skaters, whose masses are 45 kg and 75 kg, hold hands and rotate about a vertical axis that passes between them, Find the angular momentum of the system about it's center of mass
Recalling that an object smaller than the wavelength illuminating it cannot be "seen", what is the minimum kinetic energy of electrons needed in an electron microscope in order to "see" an atoms whose diameter is 0.1 nm, about the size of a silicon a..
An electric motor turns a flywheel through a drive belt that joins a pulley on the motor and a pulley that is rigidly attached to the flywheel as shown in the figure below. The flywheel is a solid disk with a mass of 80.5 kg and a radius R = 0.625..
You're carrying a 4 m long, 23 poles to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold other end of the pole 35 from its tip. How much force should you exert to keep the pole motionle..
A 7.5 cm diameter horizontal pipe gradually narrows to 6 cm. When water flows through this pipe at a certain rate, What is the volume rate of flow
Let's say you have a prescription for contacts of -2 diopters. Estimate how far you will be able to focus
A string is wrapped around a pulley of radius 3.05? , and a weight hangs from the other end. What's the angular acceleration of the pulley
Two parallel plates, each having area A = 3788.0cm2 are connected to the terminals of a battery of voltage Vb = 6.0 V as shown. What is C the capacitance of this parallel plate capacitor
how long would it take a car to return to its starting place if it traveled 180 ms average speed of 90 kmhr and
An airplane is flying with a velocity of 85.0 m/s at an angle of 25.0 degrees above the horizontal. When the plane is a distance 117 m straight above a dog that is standing on level ground, a suitcase drops out of luggage compartment. How far from..
A 0.750kg block is attached to a spring with spring constant 16.5N/m . While the block is sitting at rest, What are the amplitude of the subsequent oscillations
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