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Posts by JAKE

Total # Posts: 2,227

Science Help!
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chemistry
45.1

Physics
A pendulum consists of a 2.1 kg stone swinging on a 3.6 m string of negligible mass. The stone has a speed of 7.9 m/s when it passes its lowest point. (a) What is the speed when the string is at 60° to the vertical? (b) What is the greatest angle with the vertical that the...

Math
IM MISSED TWO!!!! AND IM IN CONNEXUS

Physics
A block of mass m = 800 g is released from rest and slides down a frictionless track of height h = 57.0 cm. At the bottom of the track the block slides freely along a horizontal table until it hits a spring attached to a heavy, immovable wall. The spring compressed by 2.49 cm ...

Chemistry/mine engineering
why are you solving for temp final??? we are looking for mass of the rod...?

math
Jack used the digits 4,5,6,7 to make the largest and smallest numbers possible. Then he subtracted the 2 numbers and came up with 2,997. What did Jack do wrong?

math
The answer is B, guys you answered everything but (B) and the other answers are wrong. Take it from me I got the question wrong when I put the answer (c) so it showed me what was right. Yep, well see yuh

Chemistry
Calculate the molarity of 25.00ml H2SO4 solution if 32.48ml of 0.1068M NaOH is required to titrate? Balanced equation is H2SO4(aq)+2NaOH(aq)=Na2SO4(aq)+2 H2O (l)

chemistry
write the balanced molecular and net iconic equations for the reaction between aluminium metal and silver nitrate. Identify the oxidation and reduction half-reaction

calculus
find the x-coordinate of all points on the curve y=12Xcos(5X)-(30*sqrt3*X^2) + 16, pi/5<X<2pi/5 where the tangent line passes through the point (0,16), (not on the curve) I have absolutely no idea how to solve this one

chemistry
what volume of 0.150M Li2Sr solution is required to completely react with 130ml of 0.150M Co(NO3)2

Chemistry
It is SrCl2 not SrLi2

Chemistry
If 4.7M SrLi2 solution is diluted to 45L, what is the molarity of the diluted solution?

AP Calculus
no clue

Calc
this problem has been a challenge for me.

Calc
Hi Reiny. According to my webwork. The answer it not correct. Any additional help?

Calc
Please help with implicit differentiation. Find dy/dx for 4x^3+x^2y-xy^3 = -4

math
Data were recorded for the demand and revenue of a given product. Find the linear regression line which represents the revenue function. Find the quadratic regression curve which represents the revenue function. Data Demand x Revenue y 1 0 100 2 4 139.2 3 8 176.8 4 12 212.8 5 ...

physics
A heavier mass m1 and a lighter mass m2 are 17.5 cm apart and experience a gravitational force of attraction that is 9.80 10-9 N in magnitude. The two masses have a combined value of 5.00 kg. Determine the value of each individual mass

chemistry
You have prepared 20.00 mL of a buffer, using 4.00 mL 0.010 M HA (weak acid) and 3.00 mL 0.010 M NaA (provides A-, the conjugate base of HA). pKa for HA is 6.25. How many moles of HA will be present in the mixture after addition of 0.20 mL 0.010 M NaOH?

Chemistry
Wow, THANKS!

Chem
when 21.70 ml of 0.5000 m h2so4 is added to 21.70 mL of 1.000 M KOH in a coffee cup calorimeter at 23.50 degrees c, the temperature rises to 30.17 degree c. calculate delta H of this reaction (Assume that the total volume is the sum of the individual volumes and that density ...

Chemistry
Ok. Reported already

Physics
Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North) Because when i add 8.6 and 12 it doesnt equal 15m. It should ...

Math
Yunogasai is wrong!!! Its C B C C C 100%

math
Theater prices: Adult- $6.00 Student- $3.00 4 adult tickets and 6 student tickets on a night that offers the special deal that a free ticket is given with each ticket purchased

Math
Determine whether the graph of x=y^2-1 is symmetric with respect to the x-axis, the y-axis, the origin, or has no symmetry.

Physics
A stone is thrown vertically upward at a speed of 27.00 m/s at time t=0. A second stone is thrown upward with the same speed 2.060 seconds later. At what time are the two stones at the same height?

english
Apop

Math
9 digits, 10 choices for each digit (0-9) 9^10

Pre-Calculus
Find all solutions of the equation and express them in the form a+bi 2x^2+3=2x

math
Damon can you help me. My name is Jake so find that one obviously. Much appreciated. I don't understand those problems.

8th grade math
Ms. Sue ... can you please help me with my questions. My name is Jake. Much appreciated.

math
Can someone help me with my questions please. HELP!

Math...Help.Thx
I got something different but I'll figure out how you got that. Thankyou.

Math...Help.Thx
CAN SOMEONE HELP ME PLEASE? STRUGGLING WITH BOTH OF THESE ?'s... PLEASE HELP!!! Merci.

Math...Help.Thx
20. READING: The number of pages P a student can read varies directly with the amount of time T in minutes spent reading. The student can read 90 pages in 60 minutes. Write an equation that relates P and T. PREDICT the number of pages the student can read if 90 minutes is ...

MATH
make up a set of 5 numbers having the following landmarks: median: 9, range: 7, minimum:5

economics
what circular flow the the following fall into 1)You receive $15,000 in profits from your half-owner of a Krispy Kreme franchise. 2)The Georgia Bulldogs sells season football tickets for $50.00. 3)What market determines the price per acre of farmland? 4)What market determines ...

Science
idk what do you think?

Economics
can someone teach me how to calculate per unit opportunity cost

history #5
dbc

Economics
Of your implicit and explicit costs of attending college, which is more, why?

Calculus
A water tank in the shape of a right circular cylinder has a volume that is increasing at the rate of 300pi cubic centimeters per hour. If the height is decreasing at the rate of 15 centimeters per hour, find the rate at which the radius is changing when the radius is 20 ...

Calculus
Water is leaking from the bottom of a tank in the shape of an inverted cone having an altitude of 12 feet and a radius of 2 feet. If the water is leaking at the rate of 0.25 cubic feet per minute, how fast is the water level decreasing when the water is 4 feet deep?

physics
Which one of these statements regarding standing waves on a string is FALSE Select one: a. The frequency of the first harmonic depends on the tension in the string b. The frequency of the first harmonic depends on the speed of the wave c. The frequency does not depend on the ...

physics
Which one of the following statements about standing waves on a string is FALSE? Select one: a. All other frequencies are integer multiples of the first harmonic b. The first harmonic is the lowest frequency standing wave that can be formed. c. The first harmonic has the ...

physics
The Bernouilli equation is a statement of which physical principle? Select one: a. COnservation of Momentum b. Newton's Second Law c. Pascal's Principle d. Conservation of Energy

physics
A mass of 2.9 g is hanging underneath a spring which has an unknown spring constant. The period of oscillation is 5.5 seconds. Find the spring constant in N/m. Give your answer to 2 s.f.

physics
A submarine dives down to a depth 9.5 beneath the surface of the ocean. Calculate the pressure in atmospheres at that depth, assuming the density of water is 1029 kg/m3, and the air pressure at the surface is 101.5 kPa

physics
A mass of 2.9 g is hanging underneath a spring which has an unknown spring constant. The period of oscillation is 5.5 seconds. Find the spring constant in N/m. Give your answer to 2 s.f.

physics
A spring and mass system are oscillating with an amplitude of 8.4 cm. The spring constant is 204 N/m and the mass is 540 g. Find the mechanical energy of the system to 2 sf.

physics
Which one of the following statements about an object performing Simple Harmonic Motion is TRUE? Select one: a. The object reaches its maximum speed as it passes through the equilibrium point. b. The object’s velocity is never zero. c. The object has a constant velocity. ...

Math
SA

physics
false

physics
The elastic potential energy of an object may be negative Select one: True False

physics
You shoot a 57 gram dart vertically upwards from a catapult with a spring constant of 379 N/m. The catapult is initially stretched from the equilibrium point by 30 cm. What is the height above the starting point reached by the dart? Ignore air resistance and give your answer ...

physics
Which one of these statements concerning elastic collisions is FALSE? Select one: a. The two objects remain together after collision b. The kinetic energy is conserved c. The momentum is conserved

physics
You shoot a 57 gram dart vertically upwards from a catapult with a spring constant of 379 N/m. The catapult is initially stretched from the equilibrium point by 30 cm. What is the height above the starting point reached by the dart? Ignore air resistance and give your answer ...

physics
Which one of these statements regarding non-conservative forces is FALSE? Select one: a. A non-conservative force cannot have a potential energy defined for it. b. The work done by a non-conservative force may be either positive or negative depending on the direction of motion...

physics
Which one of these statements concerning elastic collisions is FALSE? Select one: a. The two objects remain together after collision b. The kinetic energy is conserved c. The momentum is conserved

physics
Which one of these statements regarding non-conservative forces is FALSE? Select one: a. A non-conservative force cannot have a potential energy defined for it. b. The work done by a non-conservative force may be either positive or negative depending on the direction of motion...

Science
Victoria is right! 100%

Algebra
Which represents the reference angle for 3pi/4? A) (3 pi)/4 B) pi/3 C) pi/4 D) pi/6 I have no clue on how to do this. (Looking at my unit circle I think A?)

Algebra
What is the period of the function? y = 2 cos pi x I said 2.

Chemistry
Which of the following explains why there are so many differences in the properties of peptides and proteins? A) several amino acid sequences are possible for proteins and peptides B) some proteins are enzymes while others are not C) proteins and peptides include nitrogen D) ...

History
How many administrations was Fidel Castro alive through? I know that he was alive through, Kennedy, and Reagan. Surely they are more can anyone help me?

science
A is correct. Good job.

science
I disagree, D actually sounds majorly preposterous. As well as C being outright impossible. Can you now decided between A or B?

physics
At a certain undisclosed place (probably not on Earth) an Atwood's like experiment gives the graph of 1/t2 vs Δm the slope is 3.8 (in 1/(kg s2). One also knows that h=1.3m, total mass =0.8kg and I/r2 = 0.08kg. what is the gravitational acceleration is (in m/s2)?

physics
For the system on the diagram, the string is massless, and slides over the pulley without friction. The masses are m1 = 5.7kg and m2 = 6.4kg. what is the magnitude of the acceleration of the system is ( in m/s2)

physics
A force 457 Newtons causes a displacement 6.2 metres which is at an angle of 8 degrees to the direction of the force vector. Calculate the work done by the force.

physics
A student of mass 64.7 kg climbs up the stairs in the Physics Department, with a vertical height change 3.1 metres. What is the change in gravitational potential energy? Give your answer in Joules, to 2 significant figures.

physics
What work is done by a friction force acting on an object? Select one: a. Always negative b. Always positive c. May be positive or negative depending on the choice of coordinate system d. Always zero

physics
You push your backpack, mass 2.8 kg across the desk with a force of 49.3 N. Calculate the acceleration of the backpack. Neglect friction forces and give your answer to 3 significant figures.

Statistics
1. This probability distribution shown below relates to the number of times a person goes to a local coffee shop per day. What is the expected mean (average) number of times a person goes to a local coffee shop per day? 2. What is the area equal to under a normal curve ...

Chemistry
What is [OH-] for a 4.72 X 10^-9M HCL solution? Would I just take 1.0X10-14 divided by 4.72X10-9?

Math
230

Java
What would happen if I did not give a access specifier. Would the class method or attribute be accessible to all other classes?

Trigonometry
Simplify each expression using fundamental identities. 1. Sin theta cot theta 2. 1-sin^2 theta / cos theta

chemistry
What volume of a 0.500 M solution should be diluted to make 250 mL of a 0.400 M solution?

Math
92-14=78

Math
Just to clarify I think the first one is wrong 5x 4= 20 and it has to be 20 but triangles you divide by 1/2 and it'd be ten

physics
(a) A hydrogen atom has its electron in the n = 5 level. The radius of the electron's orbit in the Bohr model is 1.323 nm. Find the de Broglie wavelength of the electron under these circumstances. (b) What is the momentum, mv, of the electron in its orbit?

physics
Gamma rays (γ-rays) are high-energy photons. In a certain nuclear reaction, a γ-ray of energy 0.306 MeV (million electronvolts) is produced. Compute the frequency of such a photon

math
which is larger .007 or .700

chemistry
What is the % yield of of a reaction in which 40.00g of tungsten(VI)oxide (WO3) reacts with excess hydrogen gas to produce metalic tungsten and 5.40mL of water. (assume the density of water is 1.00g/mL)

chemistry
in the reaction Al2O3= Al+O2 if 742.5 grams of Al2O3 are used how many mols of Al will be produced?

Soc
Is it important to distinguish between heterogeneity within a group and differences across several groups?

Calculas
The profit obtained when x barbecues are sold is P(x) = 100 x − 3x^2 (lnx) dollars . Find the marginal profit when 4 are sold.

educational technology
A D B is right!!

Global Studies
hahaha ya dat true she will go to hell for cursing and rainbow candy is right

Chemistry
a balloon has a volume of 2.0 L at room temperature (27 degrees celsius). at what temperature would the balloon have a volume of 2.0L?

social studies check answers
kyle is right do y`all go to connections acadmy

homonyms
What is the homonym for do?

Physics
A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. the combined mass swings up to a height of 8.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision? Answer a. 0.394 kg·m/s b. 0.632 kg&...

Phy
A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. the combined mass swings up to a height of 8.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision? Answer a. 0.394 kg·m/s b. 0.632 kg&...

Physics
A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. the combined mass swings up to a height of 8.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision?

Math
Rey is playing a game. For every 2 steps forward he takes, he takes one step back. Complete the function table to show Rey's steps. Then write an equation for the function table. F 2-4-6-8-10 B _ _ _ _ _

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