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A balloon is filled with helium at a pressure of 2.4 x 10^5 pa. The balloon is at a temperature of 18 degrees C and has a radius of 0.25 m.
(a) How many helium atoms are contained in the balloon?
(b) Suppose we double the number of helium atoms in the balloons, keeping the pressure and the temperature fixed. By what factor does the radius of the balloon increase?
A sailboat is heading directly north at a speed of 21 knots (1 knot = 0.514 m/s). The wind is blowing towards the east with a speed of 10.6 knots. (Both velocities are given relative to the Earth.)
The tension in a guitar string is increased by a factor of two. by what factor does the wave velocity change
Two identical uniform poles of mass 50 kg and linear mass density 15 kg/m are supported by pivots 2 m apart on level ground. what angle do the poles make with the vertical
A large laser emits an intense pulse of light delivering an energy of 5020J in 1.28×10-2s. how many photons are emitted in this pulse
Lightning As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 680m to be the other plate. Assume the surface area of the cloud to be the same as the area of a square that ..
The speed of object at displacement x = 20 m. The change in the momentum of the object at it is displaced from x = 12 to x = 20 m.
a variable force f(x) =8x^3 -2x acts on a 2.4 kg objects movinf it from x=0.2 to x=1.4 m. what was the work done on the object
You throw a 5-kg ball from a platform releasing the ball at a height of 5 meters with a speed of 10m/s at an angle of 30 degrees with respect to the horixontal. Find the maximum height of the ball above the ground
A proton has a kinetic energy of 8.5 MeV. If its momentum is measured with an uncertainty of 4.0%, what is the minimum uncertainty in its position
A 2.4 kg breadbox on a frictionless incline of angle %u03B8 =43 is connected, by a cord that runs over a pulley, What is the speed of the box when it moves 10 cm down the incline
two object are connected by a massless string that passes over an ideal pulley. calculate the two components of the force of weight for the object on the incline plane
Two boats are heading away from shore. Boat 1 heads due north at a speed of 3.77 m/s relative to the shore. What is the speed of the passenger relative to the shore
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