Posts by bob

Total # Posts: 3,303

math
Side of Square is 25 feet. One side of rectangle is 30 feet and other is 20 feet.

math
512

math
72

math
35*6 is 210 not 200.

physics
in 1989 michel menin of france walked on a tightrope suspended under a balloon nearly at an altitude of 3150 m above the ground . suppose a coin falls from menin's pocket during his walk . how high above the ground is the coin when its speed is 60 m/s ?

physics
the largest watermelon ever grown had a mass of 118 kg. suppose this watermelon were exhibited on a platform 5 m above the ground . after the exhibition, the watermelon is allowed to slide along to the ground along a smooth ramp, How high above the ground is the watermelon at ...

physics
A Physics book , mass unknown , is dropped from a table . its velocity just before hitting the ground is 9.39 m/s . what is the height of the table ?

physics
a 20 kg rock is on the edge of a 100 m cliff . the rock falls from the cliff , what is its kinetic energy just before it hits the ground ?

physics
gtfo fag^

materials science
A bar of pure nickel is coupled with a bar of pure iron (interfaced). The diffusion couple is then heated to a temperature of 1000°C. (a) How long will it take for the concentration of nickel to reach 0.1 wt%, 1.0 μm below the interface? (b) How long will it take for ...

chemistry
6.8 grams

geometry
ABCD is a trapezoid with DC parallel to AB, AB=4, AD=4, angle A=60, angle C=45. Find DC and BC

chemistry
In a nickel bath with a total volume of 1000 gallons, titration of a 50 milliliter sample with 0.1 N silver nitrate used up 10.5 milliliters to the end point. What is the concentration in ounces per gallon of the nickel chloride (NiCl2 ) in the bath?

chemistry
A 10 milliliter sample of HCl pickle is titrated with 0.2 N NaOH to a phenol-phthalein end point and it is found that 6.5 milliliters are used. What is the concentration of HCl in the Pickle in grams per liter? In weight Percent?

math
Bob and Jack play a shooting game. In this game, they have a net at a distance. The net is made up of 1 mm thick wires. The wires run vertically and horizontally to form a mesh that has 5 mm square openings between them. A bullet 2 mm in diameter must be shot in such a way ...

physics
122

calculus
actually an ODE question(but there's no diff. eq. subforum) (y^2)(dy/dx)+y^3/x =2/x^2 using substitution u(x)=y^3 so I've been doing a few of these and getting them all wrong and this problem... I don't know where to start. I tried (1/u)(du/dx)+u/x(du/dx)=2/x^2 but...

materials science
Consider a copper lattice with an excessive average of one vacancy in every 100 unit cells. What will be its density? Compare this to the theoretical density of copper.

Chemistry
How many grams of CO2 are formed when 32 g of O2 reacts with 23 g of C2H5OH?

algebra
parking lot had a length that is 7 yards greater than thre width. the area of the lot is 450 square yards. what is the length and width?

Chemistry
Using VSEPR what is the shape of ammonia (NH3) and water (H2O) when bonded to a hydrogen bond?

Chemistry
Using VSEPR what is the shape of ammonia (NH3) and water (H2O)?

Math
Rebecca gives gifts to 12 employees. Each gift is in a box that is 12 inches by 10 inches by 3 inches. How much wrapping paper does Rebecca need to completely the cover the boxes? F. 360 in(insert exponent 2) G. 1,720 in(insert exponent 2) H. 4,320 in(insert exponent 2) J. 14,...

Chemistry
1000

Math
21

math
help me pls

Chemistry Lab
we reacted acetic acid with butanol and formed butyl acetate which is supposed to smell like banana but it smelled like sharpie/nail polish remover why might this be

chemistry
An insulated beaker contains 250.0 grams of water at 25C. Exactly 41.6 g of a metal at 100.0C was dropped in the beaker. The final temperature of the water was 26.4C. Assuming that no heat is lost in any other way, calculate the specific heat of the metal.

Physics
A wooden block of mass 29.0 kg sits on a horizontal table. A wire of negligible mass is attached to the right side of the block and goes over a pulley (also of negligible mass, and frictionless), where it is allowed to dangle vertically. When a mass of 15.5 kg is attached to ...

Physics
As above, as the x-value for particle 3 approaches infinity the only force acting on particle 2 is from particle 1. The asymptote is the value of that force. Set the equation for (kq1q2)/(r^2) = 1.370e-25N and solve for q2. Note that you can solve for r with the knowledge that...

physics
An astronaut in his space suit has a total mass of 275 kg. His weight on the asteroid Erewhon is 0.3 N. What is the acceleration of gravity on Erewhon?

math
what is the sum of the odd numbers 1-2009

pre cal
Given triangle ABC, A = 120, a = 8, b = 3; determine B to the nearest whole degree

physics
Hey there, Did anyone give you an answer? I'm just wondering because I too have a similar question.

physics
Friction provides the force needed for a car to travel around a flat, circular race track. What is the maximum speed at which a car can safely travel if the radius of the track is 82.0 m and the coefficient of friction is 0.39?

Chemistry
1620 J

finance
12.2%

chemisty
The molar heat capacity of C6H6(ℓ) is 136 J/mol ·◦C and of C6H6(g) is 81.6 J/mol · ◦C. The molar heat of fusion for benzene is 9.92 kJ/mol and its molar heat of vaporization is 30.8 kJ/mol. The melting point of benzene is 5.5 ◦C, its ...

chemistry
When 0.373 g of compound X is burned completely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0.341 C is observed. What is ∆Urxn for the combustion of compound X? The hardware component of the calorimeter has a heat capacity of 3.19 kJ/ ◦C...

math
4square root.Of 5

PARALLELOGRAM WRITING A PROOF
given 1.vx is con to xt by csctc ux con xs 2. x is midpoint of those 2 lines 3.vuts is a paarlelogram

physics
A 640-kg racing car completes one lap in 14.3 s around a circular track with a radius of 45.0 m. The car moves at constant speed. (a) What is the acceleration of the car? m/s2 (b) What force must the track exert on the tires to produce this acceleration?

Physics
65

Physics
A 18 kg object and a 26 kg object are connected by a massless compressed spring and rest on a frictionless table. After the spring is released, the object with the smaller mass has a velocity of 2 m/s to the left. What is the velocity of the object with the larger mass?

Math
Five employees at the Wild Fowl Publishing Company each come to work by a different one of five means: car, railroad, subway, and walking. They hold these positions at the company: art director, editor, publisher, receptionist, and secretary. Two of them are men named Finch ...

math
A popular new secretary at the law firm of Farnsworth, Newman, O’Malley, Price, and Reynolds, is taken to lunch by a different one of those five men on each of her first week on the job. Each man took her to eat at a different one of these five types of food: Chinese, ...

chem
How many grams are in 3.6 moles of agcl2?

math
what is equivalent to 98% o.49 or 100/98 or o.98 or 49/100

You can find the total number of different 4-digit numbers of choices for each digit (9) to the number of digits (4), or 9 to the 4th power. Based on this pattern, how many different 5-digit numbers could you make from the digits 1 through 8?

How to write out 10 the negative 6?

How to write out 10 to the negetive two?

(1/2) to the 5th power= Need to know how to write this?

chemistry
Atom X has atomic mass (A) = 40 and atomic number (Z) = 20. Atom Y has A = 42 and Z = 20. How are these two atoms related?

You move the decimal to the left for example: 123 divide by 10 is 12.3

chemistry
. Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 moles ratio. What volume of compound D is to be added? ***Dr BOB222 THE 4:1 RATIO IS ...

chemistry
6. Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 moles ratio. What volume of compound D is to be added?

chemistry
6. Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 moles ratio. What volume of compound D is to be added?

chemistry
by moles

chemistry
6. Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 moles ratio. What volume of compound D is to be added?

Select the abbreviation that tells how the italicized noun clause is used. S-subject, DO-direct object, SC-subject complement, OP-object of preposition A lecture on cleanliness was not what the children wanted to hear.

trig
The manufacturer of a propeller for a small aircraft mandates a maximum operating angular velocity of 300 rad/s. Determine whether it is safe to install this propeller whose aircraft whose engine is expected to run at a maximum of 2800 rpm

math
163.8

chemistry
the ratio is moles

chemistry
Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1. What volume of compound D is to be added?

science
10.8kg

help!!!!
A navy destroyer is exactly 68 miles North of an aircraft carrier, which is travelling West 21 degrees North at 18 mph. what speed and bearing must the destroyer maintain if it is to reach the aircraft carrier in exactly 3 hrs? is it 226mph?

pre calc
each of three circles touches the other 2.circle A has a radius of 8 cm. circle B has a radius of 4 cm.circle C has a radius of 1 cm.a triangle is formed by connecting the centers of the 3 triangles. determine the largest angle for the triangle and in which circle is the ...

pre calc
you are 7 miles north and 4 miles west of a cabin.how far are you from the cabin? on what bearing must you walk to reach the cabin?

math
find all solutions on 0 is greater than or equal to theta < 2pi cos theta= 2sqrt3/3 4-1/2sin theta= (-16+sqrt3)/4 3(sqrt3)= -3cot theta -2=-1-2sin theta

math
the hour hand of a clock is 5 inches long and the minute hand is 6 inches long. determine the distance between the tips of the hands at 11:40 pm????

science
Is melting ice a physical or chemical change? I think it is a physical change. Am I correct?

geometry
do ur own homework

la poetry
i need help with narrative soccer

physics
An 77 person stands on a uniform ladder 4.0 long, that weighs 100 , as shown in the figure . The floor is rough; hence, it exerts both a normal force, , and a frictional force, , on the ladder. The wall, on the other hand, is frictionless; it exerts only a normal force, . the ...

Physics
A 86.0 kg diver falls from rest into a swimming pool from a height of 6.3 m. It takes 1.44 s for the diver to stop after entering the water. Find the magnitude of the average net force exerted on the diver during that time.

I love you and you should never forget that. Okay senpai remember me for centuries. I will love you to the end of time.

physics
Gas is conﬁned in a tank at a pressure of 10 atm and a temperature of 14◦C. If 58 percent of the gas is withdrawn and the temperature is raised to 50◦C, what is the new pressure in the tank?

chemistry
4.89 atmospheres

Math
Rewrite cos(arcsin(v)) as an algebraic expression in v. i know that the answer is squroot of 1-v^2 but i don't know the process of how to come to this answer. Thanks for the help!

physics
A spaceship of mass m travels from the Earth to the Moon along a line that passes through the center of the Earth and the center of the Moon. (a) At what distance from the center of the Earth is the force due to the Earth three times the magnitude of the force due to the Moon?

math
WAZUPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP NMY FRIEND HAHA

math
HIHIHIH

calculus
What is the area under each of the given curves? y=e^x/2 ; x=0 x=1

Math

Calculus
for the function F(t)=ln(t^2), let f(t)=F'(t). Write the integral from a to b of f(t) dt and evaluate it with the fundamental theorem of calculus. the integral from 1 to 3 ___ dt= __

V/CV OR VC/V PATTERN
GAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH RIPPING MY HAIR OUT THIS IS SO HARD

Economics
Suppose that some firms in a competitive industry are earning zero economic profits, while others are experiencing losses. All else equal, in the long run, we would expect the number of firms in the industry to A. increase. B. decrease. C. remain the same. D. We do not have ...

Economics
If the market price falls below \$4.50, the firm will earn A. positive economic profits in the short run. B. negative economic profits in the short run but remain in business. C. negative economic profits in the short run and shut down. D. zero economic profits in the short run.

Economics
A long-run supply curve is flatter than a short-run supply curve because A. firms can enter and exit a market more easily in the long run than in the short run. B. long-run supply curves are sometimes downward sloping. C. competitive firms have more control over demand in the ...

math
what is 2 times 5

Physics
Four particles in the xy plane have the following masses and coordinates: 1 kg at (3 m, 3 m), 2 kg at (-2 m, 4 m), 3 kg at (3 m, -2 m) and 4 kg at (-3 m, -4 m). Find the total moment of inertia about: x-axis? y-axis? z-axis?

Physics
thanks

history
where can i get facts about winchester cathedral

Chemistry
Rank the following atoms in terms of decreasing atomic radius. 1. Na, N, O, Mg, F 2. F, O, N, Mg, Na 3. F, Mg, Na, O, N 4. Na, Mg, N, O, F 5. F, O, N, Na, Mg

ELA
Those were great :D But do you have anymore ideas? We need to write at least a full page

ELA
Not that kind of funny but like its from this book and here was an example Don't bite your fingernails because the nails will look nasty. But the real reason not to bite your nails is cause when you take off a nail and it goes on the floor it will grow on the floor and it ...

ELA
I have to do this project and I have to say what funny stuff could happen if I cleaned my room. I don't know anything funny that could happen. so help me? :D

math
i don't know

physics
nkkn

Physics
(3kg)(8m/s)+ (5kg)(0m/s) 24kg*m/s = (3kg+5kg)vf (8kg)vf 24kg*m/s=(8kg)vf vf=3m/s