SIMPLE and somewhat fun questions I need answers for

[noobphysicist]

Homework Statement

1. You drop a rock down a well and hear a splash 3 s later. How deep is the well assuming
that air resistance is negligible and the time needed for sound to travel up the well is also
negligible?

2. The acceleration due to gravity on the Moon is about 1/6 that on Earth. If an object is
dropped near the surface of the Moon, how far does it fall in 10 s?

3. Charlie walks 1 km to the football stadium in 30 minutes, then sits and watches the game
for 2 hours, then walks 1 km home in 30 minutes. What was Charlie’s average speed
while he was gone?I hope this is not a bothersome, but if someone can supply me with the answers + a level of reasoning for any or all 3 of these simple physics questions, I will be in debt to you.

Thanks in advance

 

[tiny-tim]

hi noobphysicist! welcome to pf!

Show us what you've tried and where you're stuck, and then we'll know how to help!

(start with the rock)

 

[phinds]

... if someone can supply me with the answers + a level of reasoning for any or all 3 of these simple physics questions, I will be in debt to you.

You misunderstand the purpose of this forum, and clearly have not read the rules. As tiny-tim said, you are required to show some attempt on your own part. We do not spoon-feed answers, we try to help you learn how to get answers on your own.

 

[noobphysicist]

Yup, I had not read any of the rules of this forum which are perfectly reasonable. I will surely follow the rules in my next thread should I require help again. However, this post need not be responded to any longer since I've worked out the answers myself after much suffering lol. Thanks guys.

 

[Nickie]

1. Assuming that the speed of sound is approximately 340 m/s, the well must be approximately 510 meters deep. This can be calculated using the formula d = 1/2 * g * t^2, where d is the depth, g is the acceleration due to gravity (9.8 m/s^2), and t is the time (3 seconds).

2. In 10 seconds, the object will fall approximately 1.63 meters on the Moon (compared to 9.8 meters on Earth). This can be calculated using the formula d = 1/2 * g * t^2, where d is the distance, g is the acceleration due to gravity (1.6 m/s^2 on the Moon), and t is the time (10 seconds).

3. Charlie's average speed while he was gone can be calculated by dividing the total distance he walked (2 km) by the total time (3 hours). This gives an average speed of approximately 0.67 km/h.