Recent content by hannah2329

Thank you! I understand.

Homework Statement two hot air balloons are 48.8 and 52.2 meters above the ground. a person in the left balloon observes that the right balloon is 13.3 deg above the horizontal. what is the horizontal distance between the two balloons? Homework Equations The Attempt at a Solution...

I understand that I'm just not sure which velocity I'm supposed to use on each step that's where I'm stuck because everytime I tried it I got the answer wrong.

Homework Statement a train is moving at 26.1m/s. 12.7 sec later its speed is 15.9m/s. find the trains acceleration- -.803m/s^2 what additional time would be necessary to bring the train to a stop if it continues to accelerate at the same rate calculated? -.803=0-15.9/t which is 19.8...

ahh i finally got it right with one try left. :) thank you.

so i take 340=65.8/t and i get that it took .19 seconds? but i don't know what to do with that because I'm not looking for a time I'm looking for a speed.

i still have no idea. an i supposed to take half of the .72? for the time it took to hit and the time it took the sound to get to you?

thank you! i got it right!

im still confused. what equation would i use to involve the speed of sound number?

Homework Statement to qualify for a race a car must achieve an average speed of 254 km/hr on a track 1600 meters long. if a car covers half the track with an average speed of 227.5 km/hr what minimum average speed must it have the second half to qualify? Homework Equations...

Homework Statement shoot a ball at a drum 65.8 meters away from you. you hear the impact .72 seconds later. if the speed of sound on that day was 340m/s how fast must the ball be traveling? Homework Equations speed=distance/time The Attempt at a Solution i found that the ball was...

Homework Statement a negative acceleration must mean an object is slowing down. if an object has a negative velocity and a negative acceleration the object is slowing down. distance can never be negative if an object has a negative velocity and a positive acceleration the object is speeding...