Recent content by toothpick09

Homework Statement One of the fastest recorded pitches in major-league baseball, thrown by Billy Wagner in 2003, was clocked at 101.0 mi/h (Fig. P3.22). If a pitch were thrown horizontally with this velocity, how far would the ball fall vertically (in feet) by the time it reached home plate...

ok so i have ... using the equation deltax = 1/2 (v + vo)t runner A: 3mi = 1/2 (8mi/h)t t=3/4 h runner B: 1mi = 1/2 (5mi/h)t t= 5/2 h total time is 3.25 h having both time and total velocity (8mi/h + 5mi/h) and having total distance 4mi I am lost at...

right ... runner a's time is 3/8 h and runner b's time is 1/5 h ... their sum is 0.575 but i don't understand how i get how far the runners are from the pole from these calculations

Homework Statement Runner A is initially 3.0 mi west of a flagpole and is running with a constant velocity of 8.0 mi/h due east. Runner B is initially 1.0 mi east of the flagpole and is running with a constant velocity of 5.0 mi/h due west. How far are the runners from the flagpole when they...

42 km right because when boat A finishes the race in 2hours boat b has traveled 42 km. 42km/21km/hr = 2h ?

I'm sorry I am still confused

So ... 42km/42km/h = 1h which means 2h there and crossing the finish line for boat A for boat B: 42km/21km/h = 2h and 42km/63km/h = 2/3h meaning 8/3 hour for boat B's trip to and fro. but that is just the time it takes them to make the trip how do you find the distance?

Homework Statement Two boats start together and race across a 42 km wide lake and back. Boat A goes across at 42 km/h and returns at 42 km/h. Boat B goes across at 21 km/h, and its crew, realizing how far behind it is getting, returns at 63 km/h. Turnaround times are negligible, and the boat...

So after getting 81.25 which would be my total distance I divide by the total time which would be 110. This gives me .738636. This doesn't seem logical but is what I am doing correct?

I took each time divided by 60 to give me hours then multiplied that number by the km/h. Added them up and got 81.25. What am I doing wrong?

Homework Statement A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 15.0 min at 65.0 km/h, 20.0 min at 75.0 km/h and 60.0 min at 40.0 km/h, and spends 15.0 min eating lunch and buying gas. Determine the average speed for...

A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 15.0 min at 65.0 km/h, 20.0 min at 75.0 km/h and 60.0 min at 40.0 km/h, and spends 15.0 min eating lunch and buying gas. Determine the average speed for the trip. I know...