Acar drives carrying a flag of width w=0.5m. when the flag goes through a photogate, it blocks and unblocks a light. if the average speed of the car is 20m/s, what is the photogate time interval in seconds?

width of the flag is given as

speed of the car will be

now the time to cross the photogate by the flag is given as

so the time interval will be 0.025 s

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19