sake

the free-fall acceleration on the surface of the moon is appromimately 1/6 of the free-fall acceleration on the surface of earth. compare the period of a pendumlum on earth with that of an identical pendulum set in motion on the moon

a sound wave of frequency 500 hz travels from air into water. the speed of sound in air is 330 m s-1 and in water 1490 m s-1. what is the wavelength of the wave in a)air; b)water

a ship sends a snoar pulse of frequency 30kHz and duration 1.0 ms towards a submarine and receives a reflection of the pulse 3.2 s later. the speed of sound in water is 1500 ms-1. find the distance of the submarine from the wavelength of the pulse and the...

until germany's invasion of poland the democratic nations which had been victorious in world war I had observed all these separate aggressions and done little. the league of nations had all but collapsed in the wake of italy's invasion of ethipia. britain...

what's the area behind your knees called

In 1961, President Kennedy backed an invasion of the island by Cuban refugees in the US; it failed. what does it mean to back an incasion

when a hot object warms a cooler object, does temperature flow between them

so when a hot object warms a cooler object, temperature does not flow between them. but are the temperature changes of the two objects equal?

thanks but actually i figured it out by myself!

i still don't get it. why is the distance x 2 and what does it mean ms for the pulse duration