A rocket starts from rest and accelerates for 8 seconds at a rate of 3.6m/s2. (A)What is its speed at the end of the 8 seconds?
(B)How far does the rocket travel during the FIRST FOUR SECONDS of the 8 second trip?
(C)How far does it travel during the last four seconds of the 8 second trip

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.

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)