Joe

I'm doing a worksheet for physics and need help with these questions

An object is dropped from rest and falls freely 20. meters to earth. When is the speed of the object 9.8 meters per second?

A) during the entire first second of its fall

B) at the end of its first second of fall

C) during its entire time of fall

D) after it had fallen 9.8 meters

A rock dropped off a bridge takes 5 seconds to hit the water. Approximately what was the rock's velocity just before impact?

A 25-newton weight falls freely from rest from the roof of a building. What is the total distance the weight falls in the first 1.0 second?

An astronaut drops a hammer from 2.0 meters above the surface of the Moon. If the acceleration due to gravity on the Moon is 1.62 meters per second (squared), how long will it take for the hammer to fall to the Moon's surface?

A ball is thrown horizontally at a speed of 24 meters per second from the top of a cliff. If the ball hits the ground 4.0 seconds later, approximately how high is the cliff?

A) 6.0 m

B) 39 m

C) 78 m

D) 96 m

A stone is dropped from a bridge 45 meters above the surface of a river. Approximately how many seconds does the stone take to reach the water's surface?

An object is allowed to fall freely near the surface of a planet. The object falls 54 meters in the first 3.0 seconds after it is released. The acceleration due to gravity on that planet is ___

Thanks so much for all of the help! :)

Directions: Simplify

1.) x over 2x+2y plus y+4 over 3x+3y

x y+4

-------- + -----------

2x+2y 3x+3y

2.) 1 over e squared minus 4 all over 1 divided by e minus 2.

1

--- - 4

e2(squared)

-------------------

1

-- - 2

e

Directions: Divide

3.) 3a+4 over 5a sqaured divided by 3a+4 divided by 10a

3a+4 3a+4

------- / --------

5a2 (sqaured) 10a

Thank you so much for all the help! :-)

Directions: Give the name and formula of the acid and the base from which each salt was formed.

1) NaCl

-acid name?

2) KClO3

-acid name?

-acid formula?

Directions: Given the concentration of either hydrogen ion or hydroxide ion, use the ion product constant of water to calculate the concentration of the other ion at 298 K.

3) [H+] = 2.0 X 10^-4 M (X represents multiplication sign)

4) [OH-] = 1.1 X 10^-2 M (X represents multiplication sign)

thanks so much for all the help! :-)

Directions: Identify the conjugate acid-base pairs in the following reactions. (Type your answer using the format [NH4]+ for NH4+.)

(a) NH4+(aq) + OH -(aq) <---> NH3(aq) + H2O(l)

(b) HBr(aq) + H2O(l) <---> H3O+(aq) + Br-(aq)

(c) CO32-(aq) + H2O(l) <---> HCO3-(aq) + OH -(aq)

(d) HSO4-(aq) + H2O(l) <---> H3O+(aq) + SO42-(aq)

Thank you so much! :-)

Hello.

I've been doing my math homework for almost and hour & I have NO idea how to do these problems.

Directions: Simplify

1.) √9y16 (the 16 is an exponent)

2.) √e9f7g2 (9, 7, and 2 are all exponents)

3.) 25 -3/2 (-3/2 is an exponent)

4.) 2r√10r X 3y√2ry2 (the X represents multiplication and the 2 in ry2 represents an exponent)

5.) 2√21

OVER

3√35

6.) 1

OVER

3√2 (the 3 represents an exponent)

7.) 3√24 - 5√3 + √54

8.) (√3 - √7)2 (the 2 represents an exponent

If possible please show the work. Every answer is greatly appreciated.

THANKS SOOO MUCH :)

Hi, i'm having some difficulties with doing this math problem.

Simplify:

x2-6x=15 (the x2 signifies "x squared"

If possible please show the work to find the answer.

Thank You! (: <3

I have no idea if these two problems can be factored.

1.) 2x3+5x2+5x+5

2.) 6x2+19x+60

If these two problems can be factored any furthur please explain how.

Thanks so much! :)

I have no idea if these two problems can be factored.

1.) 2x3+5x2+5x+5

2.) 6x2+19x+60

If these two problems can be factored any furthur please explain how.

Thanks so much! :)

Directions: Solve By Factoring

1.) 2x2-5x-12=0

Please explain how to solve this problem.

Thanks so much! :)

Directions: Solve By Factoring

1.) 2x2-5x-12=0

Please explain how to solve this problem.

Thanks so much! :)

Directions: Solve By Factoring

1.) 2x2-5x-12=0

Please explain how to solve this problem.

Thanks so much! :)

Hi, I'm having tremendous trouble with these chemistry problems. I have no idea how to solve them!

Directions: What is the mass in grams of each of the following?

(a) 5.06 x 1024 atoms Bi

(b) 1.13 x 1024 atoms Mn

(c) 4.44 x 1022 atoms He

(d) 1.54 x 1015 atoms N

(e) 2.75 x 1015 atoms U

I have no idea what to do with these problems. If there is a formula or something, please tell me! Or a step by step approach to solve these problems. Btw, the X's in the problems stand for multiplication signs(:

THANK YOU SO MUCH.

Hi, I have two questions that have to do with algebra 2 (factoring)

First Problem:

x2+36 (Can this be factored any further?)

Second Problem:

9-x2y2 (Can this be factored any further?)

Oh, by the way, the 2's in the problems (after the x's & y) symbolize squares.

Thanks! :)

Hi, I need help with trying to figure out what process is going on in the different situations below. All answers are greatly apprecited :)

a) A solid air freshener cube getting smaller and smaller.

b) Dewdrops forming on leaves in the morning.

c) A crust of ice forming on top of a pond.

Thank You! :)

hi, i had a question involving reciprocals. the reciprocal for "-3/4" would be "4/3", yeah? i just learned about reciprocals so i'm still a little confused with the topic. thanks for the help! :]

hi, i'm having difficulties with this problem

y=mx+b (solve for m)

i have no idea how to solve for m. if you can show work with the answer that'd be great.

thanks! :]

hi, i'm traveling to d.c./georgetown today and i wanted to know where i would be able to find fake gucci and louis vuitton etc. please list the specific streets if you know. thanks!

Hi, i'm traveling to d.c. later today and i wanted to know where i'd be able to find fake handbags/wallets and rolex watches? i heard georgetown has a lot of fake accessories but what streets specifically? and do the handbags/wallets look like their real?

thanks so much!

Hi, i'm traveling to d.c. later today and i wanted to know where i'd be able to find fake handbags/wallets and rolex watches? i heard georgetown has a lot of fake accessories but what streets specifically? and do the handbags/wallets look like their real?

thanks so much!

Hi.

I have to answer this question in a few sentences but don't really know how to.

Please answer this question for me. I will pick the best answer right away.

"How can you decide, using slope, whether two nonvertical lines are parallel? whether two nonverticallines are perpendicular"?

Thank you so much in advance :)