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On October 21, 2001, Ian Ashpole of the United Kingdom achieved a record altitude of 3.35 km (11 000 ft) powered by 600 toy balloons filled with helium. Each filled balloon had a radius of about 0.45 m and an estimated mass of 0.35 kg.
(a) Estimate the total buoyant force on the 600 balloons.
(b) Estimate the net upward force on all 600 balloons.
One of the attempts to contain the spill involved pumping drilling mud into the well to balance the pressure of escaping oil against a column of fluid (drilling mud) having a density significantly higher than that of seawater and oil.
A current of 200 rnA flows in a silver wire of radius 0.8 mm. Find the electric field within the wire
A proton beam in an accelerator carries a current of 148 ?A. If the beam is incident on a target, how many protons strike the target in a period of21.0 s
Two point charges are placed on the x axis as follows: chargeq1= -1.50 nC is located at x=.200m, and a charge q2= +5.00 nC is atx=-.300m. What are the magnitude and direction of the net forceexerted bu these two charges on a negative point charge q3=..
A person pushes horizontally with a force of 210 N on a 53 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.30. What is the magnitude of the frictional force
A 75.0 kg stunt man jumps from a balcony and falls 26.5 m before colliding with a pile of mattresses. what is the average force exerted by the mattresses on the stuntman
a 3.77-kg ball of clay is thrown downward from a height of 3.47 m with a speed of 4.81 ms onto a spring with k 1690
In order better to map the surface features of the Moon, Calculate the satellite's kinetic energy, gravitational potential energy, and total orbital energy
q1. a 245 ball is tied to a string. it is pulled to an angle of 5.20 and released to swing as a pendulum. a student
Using the electric field described in the alpha-cannon simulation, suppose that an alpha particle is fired upward and forward from a height y = 0 m at a speed v = 28.0 m/s.
A toy car of mass 2.0 kg is stationary and a child rolls a truck of mass 3.5kg straight toward it with a speed of 4.0 m/s. What is the velocity of the center of mass of the system
A device known as Atwood\'s machine consists of two masses hanging from the ends of a vertical rope that passes over a pulley, calculate the magnitude of their acceleration, a, and the tension in the rope, T
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