#1

Hey everybody, if you like physics, or just wanna refresh yourself, I'm making this thread for you. I'll post problems every once in a while, and you Answer, I'll tell you if it's correct or not. This is all coming from a set of old problems I had when I was in physics. Just thought I'd make a little something to keep people not bored, even if it does mean doing physics problems Oh, and use 5 significant figures, you gotta be precise!

1. A stone falls from rest from the top of a cliff.

A second stone is thrown downward from the

same height 3.6 s later with an initial speed of

70.56 m/s. They hit the ground at the same

time. How long does it take the first stone to hit

the ground? The acceleration of gravity is

9.8 m/s^2. Answer in units of s.

2. How high is the cliff? ^

Answer in units of m.

3. During a baseball game, a batter hits a high

pop-up. If the ball remains in the air for 5.69 s, how

high does it rise? The acceleration of gravity

is 9.8 m/s^2. Answer in units of m.

4. A parachutist descending at a speed of 10.4

m/s loses a shoe at an altitude of 57.5 m.

What is the velocity of the shoe just before

it hits the ground? The acceleration of gravity

is 9.81 m/s^2. Answer in units of m/s.

5. When does the shoe reach the ground? ^

Answer in units of s.

6. A man drops a stone into a water well on

his farm. He hears the sound of the splash

3.55 s later. How deep is the well? The acceleration of

gravity is 9.8 m/s2 and the speed of sound in

air is 325 m/s. Answer in units of m.

7. A toy rocket, launched from the ground, rises

vertically with an acceleration of 38 m/s^2 for

11 s until its motor stops.

Disregarding any air resistance, what maximum height above the ground will the rocket achieve? The acceleration of gravity is 9.8 m/s^2.

Answer in units of km.

**The first set of problems:**1. A stone falls from rest from the top of a cliff.

A second stone is thrown downward from the

same height 3.6 s later with an initial speed of

70.56 m/s. They hit the ground at the same

time. How long does it take the first stone to hit

the ground? The acceleration of gravity is

9.8 m/s^2. Answer in units of s.

2. How high is the cliff? ^

Answer in units of m.

3. During a baseball game, a batter hits a high

pop-up. If the ball remains in the air for 5.69 s, how

high does it rise? The acceleration of gravity

is 9.8 m/s^2. Answer in units of m.

4. A parachutist descending at a speed of 10.4

m/s loses a shoe at an altitude of 57.5 m.

What is the velocity of the shoe just before

it hits the ground? The acceleration of gravity

is 9.81 m/s^2. Answer in units of m/s.

5. When does the shoe reach the ground? ^

Answer in units of s.

6. A man drops a stone into a water well on

his farm. He hears the sound of the splash

3.55 s later. How deep is the well? The acceleration of

gravity is 9.8 m/s2 and the speed of sound in

air is 325 m/s. Answer in units of m.

7. A toy rocket, launched from the ground, rises

vertically with an acceleration of 38 m/s^2 for

11 s until its motor stops.

Disregarding any air resistance, what maximum height above the ground will the rocket achieve? The acceleration of gravity is 9.8 m/s^2.

Answer in units of km.

#2

I am quite sure someone will tell you to post this in the Math/Physics thread.

#3

I'd try and work them out if I could be bothered to dig out my calculator.

S U V A T for all of them, if I'm not mistaken.

S U V A T for all of them, if I'm not mistaken.

#4

I am quite sure someone will tell you to post this in the Math/Physics thread.

This is a whole problem solving thread though. not for questions. This is like a game.

#5

School just started, and I've only had Physics for two days, and I already dislike it.

*avoids thread like the plague*

*avoids thread like the plague*

#6

My physics class consists of me drawing on my folder the entire period. Physics sucks.

#7

Physics is brilliant and I won't here a word said against it...

Or...typed against it.

PHILLISTINES.

English is also brilliant.

>.>

#8

Back on topic....

#9

I need the equations. I haven't taken dynamics since my junior year of college.

#10

I need the equations. I haven't taken dynamics since my junior year of college.

v=dr/dt

a=dv/dt

That's the answer to all of life's questions, use them wisely.

#11

v=dr/dt

a=dv/dt

That's the answer to all of life's questions, use them wisely.

I'm too lazy to derive further.

#12

I need the equations. I haven't taken dynamics since my junior year of college.

Forms of Motion Equations section and conservation of energy will solve all of the problems.

#13

All the questions seem like they're part of the same unit. The TS' name has 92, so he's probably around the age where he'd start taking this stuff in HS / early first year uni. Definitely couldn't be a "Solve my homework" thread in disguise!

#14

This is my old homework guys, I took physics junior year, last year :P

#15

Fuck this. I hated physics. I dropped it after 2 weeks my junior year in high school because my teacher sucked at teaching it. I'm pretty good at math... but I prefer it when a teacher would explain it right the first time, instead of giving us a brief explanation, then everyone getting confused and all going up to her desk for one-on-one. I refuse.

Now... for my senior year I had Trig and Adv Algebra. Aced both classes.

Sorry

/physicsrant.

Now... for my senior year I had Trig and Adv Algebra. Aced both classes.

Sorry

/physicsrant.