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A spherical weather balloon is filled with hydrogen until its radius is 3.40 meter. Its total mass including the instrument it carries is 13.0 kilogram.
Determine the buoyant force acting on the balloon, If its density is 1.29 km/m^3.
_____________N
Determine the net force acting on balloon and its instruments if the balloon is released from the ground?
____________N
Consider an RC circuit in which the capacitor is beingcharged by a battery connected in the circuit. After a time equalto three time constants, what percentage of the final charge is present on the capacitor?
A power supply maintains a potential difference of 79.1 V across a 1.69 KQ resistor. What is the current in the resistor in millamperes
Suppose that a 1.00 cm3 box in the shape of a cube is perfectly evacuated, except for a single particle of mass 1.05 10-3 g. Find the mass density inside the box
the boom of a fire truck raises a fireman and his equipment - total weight 280 lbf 60 ft into the air to fight a
A diverging thin lens and a concave mirror have focal lengths of equal magnitude. Determine the properties of the final image of the system affter two refractions
a 13-g sample of an unkown metal is heated to 96.0 degrees C. What is the specific heat of the unknown metal
A spaceship is measured to be 158 m long while at rest relative to the observer. what length does the observer measure
A loudspeaker of mass 18.0 {rm kg} is suspended the distance of h = 1.20 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 2.70 {rm m}. What is the tension T in each of the cables? Utili..
Suppose molecules of an ideal gas are escaping by effusion through a small hole in a wall of an enclosure maintained at temp T. Calculate the mean kinetic energy of a molecule in the effusion beam Ue
A car is driven east for a distance of 48km, then north for 32 km, and then in adirection 31°east of north for 25 km. Draw the vectordiagram and determine the total displacement of the car from itsstarting point.
What is the lowest possible kinetic energy of the atom in the box and what velocity does the atom have in the absence of such a measurement?
A person is standing on and facing the front of a stationary skateboard while holding a construction brick. The mass of the person is 70.0 kg, determine the recoil speed of the person and the skateboard
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