An air tank is filled with 0.150m ^ 3 of helium gas, pressurised at 15 200 kPa. We wish to use this air tank to fill balloons, each of which will occupy a volume of 0.113m ^ 3 . How many such balloons can be filled with the helium from the tank, if each balloon must be pressurised to 101 kPa?

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Acharge of 8.4x10^-4 c moves at an angle of 35 degrees to a magnetic field that has a field strength of 6.7x10^-3 t. if the magnetic force is 3.5 x10 ^-2 n, how fast is the charge moving?

Aplane travels 1000 miles in 5 hours .what is the planes average speed?