# Posts by Tim

Total # Posts: 1,498

**Physics**

Assume a spring has an un-stretched length Xo. Write an expression for the elastic potential energy of the spring in terms of the position of the end of the spring x and its spring constant k.

**Physics**

Consider the gravitational potential, kinetic, and total mechanical energies of a cart moving down an inclined ramp. (Also, let gravitational potential energy be defined to be zero when the cart is at the bottom of the ramp. A. Write an expression for the gravitational ...

**Calculus**

Find all points on the graph of the function f(x) = 2 cos x + cos^2 x at which the tangent line is horizontal. (Use n as your arbitrary integer.) smaller y-value (x,y)= larger y-value (x,y)=

**Math**

What is an equation for the line that passes through points(4,-4) and (8-4)?

**Calculus Help**

Find a parabola with equation y = ax^2 + bx + c that has slope 6 at x = 1, slope −14 at x = −1, and passes through the point (2, 17).

**Algebra word problems**

You have a total of $175 in $5 and $20 bills. The number of $5 bills you have is 3 more than 4 times the number of $20 bills. How many of each type of bill do you have?

**math 2**

255

**Physics**

COULD I GET SOME HELP?

**Physics**

A dynamics cart with a friction pad is placed at the top of an inclined track and released from rest. The cart accelerates down the incline at a rate of .60m/s^2. If the track is angled at 10 degrees above the horizontal, determine the coefficient of kinetic friction between ...

**Physics**

A baseball player rounds third base and is heading for home when he is signaled by the base coach to slide. The player has a speed of 3.5m/s when he begins to slide and he travels through a linear distance of 1.50 meters before coming to rest. Determine the coefficient of ...

**Calculus Help**

Let P(t) be the percentage of Americans under the age of 18 at time t. The table gives values of this function in census years from 1950 to 2000. (I didn't put the table here because it will not display well so the table has basically t as time from 1950 to 2000 and P(t) ...

**Calc Help Please**

I did some of them so can you help me with the rest. Consider the piecewise functon f(x) = (4x^2-3)/(3x^2-15) x<(-2) square root of(4-x^2) (-2)<-x<-(2) 5 x>2 lim x->-2^- f(x)= ?????? lim x->-2^+ f(x)= 0 f(-2)= 0 f(4) = 5 list the values of x for which f(x) is...

**Math**

the smallest regulation golf ball has a volume of 2.48 cubic inches. if the diameter of the ball were increased by 10%, or a factor of 1.1, what will the volume of the golf ball be?

**Philosophy( Please Help Me))**

Hi, can someone please tell me whether or not I have choose the correct answer for these three questions. 1. According to Gilligan, which of the following best describes male thinking? a. Males adopt a personal way of relating to moral issues. b. Males adopt an abstract way of...

**Calculus**

the correct answer I was given has a negative 1/3 before the log. Also, how did you get the 1/3 value?

**Calculus**

Evaluate the integral: (cos(2-3x) - tan(5-3x))dx

**Physics**

Assume that you take data on the projectile range for a variety of different launch angles A at a fixed initial velocity Vo. You would like to plot your data to see if the range formula discussed in the introduction is supported by the data. The easiest way to do this is to ...

**Physics**

For a given initial projectile speed, you observe that the projectile has a certain range R at a launch angle A = 30 degrees. For what other launch angle will the projectile have the same range (assuming the same initial projectile speed)? Without the use of mathematical ...

**Physics**

For a given initial projectile speed Vo, calculate what launch angle A gives the longest range R. Show your work, don't just quote a number.

**4th grade math**

36 kg

**Physics**

Make a predictive statement about the path dependence of accelerations due to gravity

**Physics**

Calculate the time it would take for an object to fall through a linear height equal to the objects starting height, h for a 20 degree incline.

**Physics**

An object begins at rest on a frictionless inclined plane at a linear distance of 2.0m from the base of the incline. If the incline makes an angle of 20 degrees with the horizontal, determine the time it will take for the object to reach the base of the incline.

**Physics**

Thanks for the help. It is much appreciated!

**Physics**

A small washer is taped to a golf ball and the ball is hung from an electromagnet. When a trigger is activated the electromagnet will shut off and the golf ball will fall through a height of 75 cm to land on a time of flight pad. Determine the amount of time it will take for ...

**Physics**

An object at rest accelerates through a distance of 1.5 m at which point the instantaneous velocity of the object is 3.5m/s. Determine: a. The average acceleration of the object b. The time it took the object to travel 1.5m c. The average velocity of the object during this ...

**maths**

One pump fills a tank two times as fast as another pump. If the pumps work together they fill the tank in 18 minutes. How long does it take each pump working alone to fill the tank?

**physics**

A car is being pulled out of the mud by two forces that are applied by the two ropes shown in the drawing. The dashed line in the drawing bisects the 30.0° angle. The magnitude of the force applied by each rope is 2900 newtons (N). (a) How much force would a single rope ...

**maths**

A coin box contained some twenty-cent and fifty-cent coins in the ratio 4 : 3. After 20 twenty-cent coins were taken out to exchange for fifty-cents coins of the same value and put back in the box, the ratio of the number of twenty-cent coins to the number of fifty-cents coins...

**Maths**

Thanks Steve. Where is 12 come from?

**Maths**

Daniel's watering can holds 6L of water when full. He fills his watering can 3 times from the bucket and then the bucket is empty. How much more waterdoes one full bucket hold than Daniel's full watering can? A 3L B 9L C 12L D 18L

**MATHS**

Ken had three times as many apples as papayas. After selling 160 apples and 25 papayas, he had twice as many papayas as apples left. How many fruits did he have at first?

**MATH**

Mrs Lim is 41 years old and her daughter is 14 years old. How many years ago was Mrs Lim four times as old as her daughter?

**business**

Tim Urban, owner/manager of Urban's Motor Court in Key West, is considering outsourcing the daily room cleanup for his motel to Duffy's Maid Service. Tim rents an average of 50 rooms for each of 365 nights (365 X 50 equals the total rooms rented for the year(. Tim'...

**science**

B AND d B AND D R RIGHT THANKS

**Chemistry**

1.42e9 2.36e-10

**math**

a dealer has 30 cars and trucks. If 2 more cars are delivered, the dealer will have 3 times as many cars as trucks. How many trucks does the dealer presently have?

**physics**

a .2 kg ball is being swung around a verticle circle from a 1 m long string, the ball is traveling at 4 m/s counter -clockwise. what is the tension on the string?

**science**

If an automobile engine delivers 40.2 hp of power, how much time will it take for the engine to do 5.90 ✕ 105 J of work? (Hint: Note that one horsepower, 1 hp, is equal to 746 watts.)

**4th Grade Math: Help Is Needed ASAP**

My son is in the fourth grade and is needing help with these math problems. Can someone please help him with these problems. 1. 2/3+2/9= 2. 3/5+3/10= 3. 5/12+1/3= 4. Find the sum of 1/6 and 1/12 5. Add 1/4 to the answer in Exercise 4. 6. What is the sum of 1/8, 1/4, and 3/8? 7...

**TO ANY MATH HELPERS**

1) x= -.5 y= -.5 2) x=.5 y=5

**English**

Zach used to work at an independent record label. Negotiating could be exciting, but he was supposed to slant everything in the label’s favor. Some reps used questionable tactics. He couldn’t look at himself in the mirror if he treated people like that. First ...

**English**

When the servers arrived, Jack gave them the information on today's specials. He talked enthusiastically about the fresh berries: "They look fantastic! I want to serve them with shortcake." 1. In the above passage, "talked" is an example of a(n): a)...

**Math 5th grade**

Thank you Ms. Sue!

**Math 5th grade**

1. 16/40, 24/60 2. 24/30, 36/45 3. 24/40, 36/60

**Math 5th grade**

write two fractions that are equivalent to each fraction. 1. 8/20 2. 12/15 3. 12/20 Can u please show me

**Math 5th grade**

Write two fractions that are equivalent to each fraction. 1. 2/5 2. 21/35

**3rd grade Math**

3 by 4

**English... Urgent**

Hi this is a mystery problem can you solve this? The best forger of all time was indeed a most brilliant artist and a man respected and sought after in the criminal world. One day he was asked to copy $50 notes but the police searched his premises before be even got started ...

**English... Urgent**

Look at the following puzzles and try to decipher the well known sayings 1. Ban ana 2.nafish nafish 3.japmadean 4.issue issue issue issue issue issue issue issue issue issue 5. Lookuleap Note that I have not typed any of these words wrong

**Algebra II**

Having trouble solving this... Write the equation if a line that goes through (6,-1/2) and has an x-intercept of 5x-2y=-20 I think the x-intercept is -4, but I don't know what to do with that.

**physics**

Ok so im looking for minimum avg power for a 38 kg boy to climb a 170 m building that takes 10.2 min include only work done against gravity

**English**

Hi this is a rebus can you answer it? ECNALG

**English**

Hi this is a rebus question, can you answer it? ECNALG

**English**

Hi this a rebus, can you answer it? TEEXAMRM

**English**

Hi this is a rebus, can you answer it? KNEE LIGHT

**economics**

According to the permanent income hypothesis, households will tend to react to a temporary tax cut by? A) assuming the new tax level will be permanent. B) saving most of the additional disposable income. C) increasing consumption sharply in response to the higher disposable ...

**Contempoary Mthematics**

the amount of money

**Algebra 2**

| t - 7 | + 3 > or = 4

**Calculus**

nevermind it won't accept ANY answer now so it doesn't matter

**Calculus**

6/ln[x] find the derivative... im coming up with -6/x*(ln(x))^2 but it isn't accepting the answer what am i doing wrong?

**Calculus**

I hate these Y= (Square root of x) - 2 ________________________ (square root of x) + 2 Calculate dy/dx Please help, thank you

**PSY202**

CHERINE IS A GOOD LISTENER AND UNDERSTANDS NON-VERBAL COMMUNICATION. SHOWS A HIGH DEGREE OF A:BODILY-KINESTHETIC INTELLIGENCE B:SPATIAL INTELLIGENCE. C:INTERPERSONAL INTELLIGENCE. D:INTRAPERSONAL INTELLIGENCE.

**Chemistry**

why is it impossible to completely separate ethanol from water?

**Chemistry**

why is it impossible to completely separate ethanol from water?

**Maths**

9 is a very strange digit. Try to use four nines 9999 and normal operations plus minus multiply divide brackets etc, use 4 nines to make 100

**Maths**

9 is a very strange digit. Try to use four nines 9999 and normal operations plus minus multiply divide brackets etc, use 4 nines to make 20

**Maths**

A bookshelf has 5 shelves its made from wood that is 30 mm thick and the shelves are evenly spaced Bookshelf is 2100mm high 600mm long and 300mm wide Mark out the sides and shelves from a piece of wood 2400mm long and 1200mm wide a saw cut is approximately 3 mm thick

**Maths**

Can you use 4 fours 4444 and normal operations to arrive at 4?

**Maths**

Can you use 4 nines 9999 And normal operations to arrive at 100

**Maths**

Can you use 4 nines 9999 and normal operations to arrive at 20?

**algebra**

The perimeter of a square is 12cm greater than that of another square. It's area exceeds the area of the other by 39cm^2. Find the perimeter of each square. I don't get how to set this up.

**Algebra2**

The perimeter of a square is 12 cm greater than that of another square. It's area exceeds the area of the other by 39 cm^2. Find the perimeter of each square.

**Maths do not see my last question displayed wrong**

Use two straight cuts to break the figure below into three pieces and re arrange them to from a square 12345 are the squares 1 234 5

**geometry**

Can you use two straight cuts to break the figure below into three pieces 5 squares numbered 12345 5 123 4

**Science**

Two south poles or two north poles are called...

**Algebra**

Membership cost 900 and 20 per round. Different club charges 1500 and 14 per round with 15 rounds free. After how many rounds does second membership become cheaper. Need the equation.

**Math**

1 2/3 + 2/3= 2 4/3 ? 5 3/8 - 1 1/8= 4 1/4 ? 3/4 + 5= 5 3/4 ?

**Math**

(A). 4 3/12? (B). 3 5/9

**Math**

5-3/12=? and 7 8/9 - 4 3/9=

**Math**

Got it right!! THANK YOU!!

**Math**

8/9 x 11/12=

**chemistry**

0.9808 M NaOH

**Math**

What should I invest now to have $15,000 in 12 years at a compounded monthly rate of 1.6%?

**math**

To determine the compound amount of an investment of $10,000 with an interest rate of 6% compounded monthly after 4 years requires you to use a table factor that goes beyond the Compound Interest Table. Calculate the new table factor for this investment.

**math**

What would be the compound amount after 19 years on an investment of $42,000 with an 11% interest rate compounded annually?

**Contemporary math**

Using the Compound Interest Table, calculate the compound amount after 5 years for an investment of $7,700 at 6% interest compounded quarterly. My answer is $10,370.82 is this correct?

**Physics**

A rope exerts a constant horizontal force of 203N pulling a 68-kg crate across the floor. The velocity of the crate is observed to increase from 3m/s to 5m/s in a time of 4 seconds under the influence of this force and the frictional force exerted by the floor on the crate. ...

**Physics**

A rope exerts a constant horizontal force of 203N pulling a 68-kg crate across the floor. The velocity of the crate is observed to increase from 3m/s to 5m/s in a time of 4 seconds under the influence of this force and the frictional force exerted by the floor on the crate.

**conditional sentence**

1 is "c" The third conditional or past unreal conditional describes a condition that can not be met because the opportunity is past. When did the system fail? It failed in the past, last night.

**Physics**

Two wires are identical, except that one is aluminum and one is copper. The aluminum wire has a resistance of 0.835. What is the resistance of the copper wire? Take the resistivity of copper to be 1.72 x 10-8 Ω·m, and that of aluminum to be 2.82 x 10-8 Ω&...

**Math**

It'll be an ellipse. The domain -3, 3. The range -2 2. Am I right?

**Math**

What type of conic section is given by the equation 4x^2+9y^2=36? What are its domain and range?

**Algebra**

5 Couples, having dinner before the prom are to be seated at a circular table. In how many ways can this occur if the seating must be boy girl, boy girl?

**Physics**

A Carnot refrigerator is used in a kitchen in which the temperature is kept at 301 K. This refrigerator uses 216 J of work to remove 2360 J of heat from the food inside. What is the temperature inside the refrigerator?

**Physics**

A lawnmower engine with an efficiency of 0.29 rejects 5500 J of heat every second. What is the magnitude of the work that the engine does in one second?

**Physics**

Assume that the pressure is one atmosphere and determine the heat in joules required to produce 2.99 kg of water vapor at 100.0 °C, starting with (a)2.99 kg of water at 100.0 °C and (b)2.99 kg of liquid water at 0.0 °C.

**Physics**

An ice chest at a beach party contains 12 cans of soda at 2.45 °C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 9.60-kg watermelon at 25.3 °C to the chest. The specific heat capacity of watermelon is nearly ...

**Elements of Calculus**

A company is manufacturing kayaks and can sell all that it manufactures. The revenue (in dollars) is given by R=750-(X^2/30) where the production output in 1 day is x kayaks. If production is increasing at 3 kayaks per day when production is 40 kayaks per day, find the rate of...

**Elements of Calculus**

A company is manufacturing kayaks and can sell all that it manufactures. The revenue (in dollars) is given by R=750-(X^2/30) where the production output in 1 day is x kayaks. If production is increasing at 3 kayaks per day when production is 40 kayaks per day, find the rate of...