Free Fallin The acceleration due to gravity (g = -10 m/s^2)
Scenario: We dropped a ball off the top of Hoover Stadium yesterday. The time
for the ball to drop was 15 seconds. Answer the following questions.
1. What was the final velocity of the ball at 15 sec.?
the final velocity was 7 m/sec
2. What was the average velocity of the ball as it fell?
0+10=10/2=5
5 m/s
3. What was the total distance the ball travelled?
As far as it could go, because it rolled with its potential energy, dropping to
kinetic energy
4. What was the velocity of the ball at 10 seconds?

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.

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?