Monday

July 28, 2014

July 28, 2014

Total # Posts: 70,595

**physics**

a man weighing around 260 pounds falling 5.5 feet vertically would have generated a force of how many pounds?

**Physics**

Jeffrey wants to swim his girlfriend who is straight across from him, on the other side of a river bank. The river has a current velocity of 4km/h [W]. The width of the river is 300m. If it takes Jeffrey 15 minutes to reach her, a) how fast should the boy swim to cross the riv...

**math**

What number sets does square root 3 belong to?

**mechanism physics **

if a 10kg block with a velocity of 10m/s collide with a stationary block of 5kg , after collission the two blocks move stick together.calculate the velocity after collision for a 10 kg block?

**Physics-help please!**

A net torque of 54 N.m is applied to a disk with a rotational inertia of 13.2 kg.m2 What is the rotational acceleration of the disk?

**calculus**

f(t) = − 4 t2 − t− 6 Find the equation of the line tangent to the graph of f(t) at t = 8. Enter the equation of the tangent line here (in terms of the variable t):

**calculus**

If C′(62) = 120 and R′(62) = 145, approximately how much profit is earned by item number 63?

**Math/Statistics**

A group of 10 students have average of GPA of 2.8 with SD of 0.3. Does this group present enough evidence to indicate that the average GPA is less than 3.0? Make your decision at a 5% level of significance.

**cc**

You are offered two different sales jobs. The first company offers a straight commission of 9% of the sales. The second company offers a salary of $ 260 per week plus 4% of the sales. How much would you have to sell in a week in order for the straight commission offer to be at...

**Managerial Economics**

HoneyBee Farms, a medium-size producer of honey, operates in a market that fits the competitive market definition relatively well. However, honey farmers are assisted by support prices above the price that would prevail in the absence of controls. The owner of HoneyBee Farms, ...

**math**

17. Jenny, Greg, & Hank gather their marbles and have 20 in total. If Jenny has 3 less than twice the number Greg has, and Hank has 1 less than Greg has, how many marbles do each of them have?

**Physics**

(31)(10.8)/17N= 19.69411765 cm = 0.1969411764m

**Physics**

A weight of 31 N is located a distance of 10.8 cm from the fulcrum of a simple balance beam. At what distance from the fulcrum should a weight of 17 N be placed on the opposite side in order to balance the system?

**Physics**

a.)N= r*F (32N)(.27m)= 8.64 N.m b.) half of .27=0.135 t= F*d (32N)(0.135)= 4.32 N.m

**Physics**

A force of 32 N is applied at the end of a wrench handle that is 27 cm long. The force is applied in a direction perpendicular to the handle as in the diagram. (a) What is the torque applied to the nut by the wrench? (b) What would the torque be if the force were applied half ...

**Physics**

a.) (1.4)(4.7)=6.58 rev/s b.) half of 6.58 is the average rev/s as it is constant acceleration so (3.29)(4.7)=15.463 revolutions

**Physics**

A bicycle wheel is accelerating at the constant rate of 1.4 rev/s2 (a) If it starts from rest, what is the rotational velocity after 4.7s? (b) Through how many revolutions does it turn in this time?

**Physics**

a= change in w divided by change in t (Wfinal- Winitial)/ time (2.1-1)/5.8 =0.189655172 rad/s ^2

**Physics**

The rotational velocity of a merry-go-round increases at a constant rate from 1 rad/s to 2.1 rad/s in a time of 5.8 s. What is the rotational acceleration of the merry-go-round?

**Physics**

a.)2π radians = 1 revolution 4π radians = 2 revolutions 4*π=12.56637061 rad b.) (2rev/ 5.5sec)(2π radians/revolution) (0.363636)(6.283185301) = 2.284794657

**Physics**

Suppose that a disk rotates through two revolutions in 5.5 seconds. (a) What is its displacement in radians in this time? (b) What is its average rotational velocity in rad/s?

**Physics**

a.) 2 b.) 2

**Physics**

Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. a.) In which of the two cases is the change in ...

**Physics**

a.) KE= 1/2mv*v 1/2(11300)(19.3)2= 2104568.5 J b.) Mtotal=5carts*11300kg=56500kg Vfinal= Pfinal/Mtotal (11300)(19.3)/56500= 3.86 KEfinal= 1/2(Mtotal)(Vfinal) 1/2(56500)(3.86)2= 420913.7 c.) carts stick together so perfectly inelastic which means energy is NOT conserved

**Physics**

Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...

**Physics**

Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...

**Riddle**

your driving a bus. at the first stop you pick up 10 people then you pick up 789 people and on the right you drop off 453 so what is the bus drivers name?

**chemistry**

4g NaOH is dissolved in 100mL of 2.5M H2SO4 will be required for its complete neutralization?

**Chemistry**

If a solution of formic acid contains 0.2 M HCHO2, 0.006 M CHO2-, and 0.006 M H+, What is the Ka of the acid? What is the ph of the solution at the concentrations given? What would happen to the equilibrium position if more CHO2- were added to the solution?

**general chem**

what is the mass percent of sodium hydroxide in a solution that is made by dissolving 8 grams of sodium hydroxide in 50 grams of h2o answer

**Physics**

Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. A.)In which of the two cases is the change in m...

**Physics**

Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...

**Physics**

A railroad car with a mass of 12400 kg collides and couples with a second car of mass 18700 kg that is initially at rest. The first car is moving with a speed of 7.7 m/s prior to the collision. (a) What is the initial momentum of the first car? (b) If external forces can be ig...

**Physics**

A.)p = m * v With the bullet travelling at v =413 m/s with a mass of 0.0045 kg: p(bullet) = 0.0045 * 413 p(bullet) = 1. 8585 N.s answer: 1.8585 N.s B.)The recoil velocity of the rifle, this is a conservation of momentum problem. So, p(initial) = p(final) In other words, the pr...

**Physics**

A rifle with a mass of 1.84 kg fires a bullet with a mass of 4.5 g (0.0045 kg). The bullet moves with a muzzle velocity of 413 m/s after the rifle is fired. (a) What is the momentum of the bullet after the rifle is fired? (b) If external forces acting on the rifle can be ignor...

**Physics**

a.) impulse= 60kg x (18.4-0)= 1104 kg/s B.) avg force= impulse/time 1104/0.6= 1840 N

**Physics**

A 60-kg front seat passenger is moving in a car initially with a speed of 18.4 m/s is brought to rest by an airbag in 0.6 sec. (a) What is the impulse acting on the passenger? (b) What is the average force acting on the passenger in this process?

**Physics**

Impulse=Ft a.) (36.7)(0.3)= 11.01 N.s b.) same answer as part a = 11.01 impulse=change in momentum

**Physics**

A force of 36.7 N acts on a ball for 0.3 sec. If the ball is initailly at rest (a) What is the impulse on the ball? (b) What is the final momentum of the ball?

**Physics**

momentum= mass x velocity momentum of bowling ball: (7)(1.73)=12.11 momentum of baseball: (0.12)(25.1)=3.012 answer: a.) the bowling ball has the larger momentum

**Physics**

A bowling ball has a mass of 7 kg and a speed of 1.73 m/s. A baseball has a mass of 0.12 kg and a speed of 25.1 m/s. Which ball has the larger momentum? a. The bowling ball. b. More information needed c. The baseball. d. Both have the same momentum

**Physics**

a.) (208N)(0.058s)=12.064 N.s b.) same answer as part a = 12.064 impulse= change in momentum

**Physics**

An average force of 208 N acts for a time interval of 0.058 s on a golf ball. (a) What is the magnitude of the impulse acting on the golf ball? (b) What is the change in the golf ball's momentum?

**statistics**

Describe one of the following experiments, which study human subjects, in 450 to 750 words: A pharmaceutical company wants to test a new sleep aid. An educational company is interested in determining whether their new math curriculum will raise standardized test scores. Teache...

**English**

adverb seen this question before.

**physics**

How many electrons pass through a lamp in 3 minutes.If the current is 300 ma?

**Poetry**

As we find with most songs, in poetry

**math**

Mang jose wants to make a table which has an area of 6m, the length of the table has to be 1m longer than the width. If the width of the table is p meters, what will be the length. Form a quadratic equation that represent the equation.

**math**

10%

**vocabulary**

Thank you for your help

**vocabulary**

Yes it says: Imagery: the formation of mental images, figures, or likenesses of things, or of such images collectively: the dim imagery of a dream. so it should be D

**vocabulary**

I don;t know is really confuseing for me, i'm stuck on this question about 20 min hehe

**vocabulary**

Yes I was checking in on wikipedia

**vocabulary**

I was thinking between C, and D, so is it D ? Becacuse i dont think this will be irony or puns

**vocabulary**

Most often, these are words that evoke mental pictures as we read or play on other senses. A. Irony B. Puns C. Antithesis D. Imagery Is it C ?

**PHI 208**

Harm may be understood as:

**Physics **

Four rocks are thrown horizontally from a building, with varying speeds and from various floors. Rock 1 lands a distance r away from the building, rock 2 lands 2r away from the building, rock 3 lands at distance 3r, and rock 4 at 4r. Ignore air resistance. Drag the rocks into ...

**Physics**

A dog sits on the left end of a boat of length L that is initially adjacent to a dock to its right. The dog then runs toward the dock, but stops at the end of the boat. If the boat is H times heavier than the dog, how close does the dog get to the dock? Ignore any drag force f...

**physics**

thanKS Henry

**physics**

Two cars are approaching a perpendicular intersection without a stop sign. Car 1 has a mass 900 kg and is heading north and car 2 has mass 900 kg and is heading west. The two cars collide at the intersection, and stick together as a result of the collision. The police report s...

**physics**

A firecracker explodes, sending pieces of equal mass in three directions as shown in the diagram. Angle θ is 14 degrees, and angle ϕ is 30 degrees. Assume that the firecracker is initially at rest, and take upward and rightward as the positive directions. What are th...

**Physics**

Two NBA players are revered for their ability to dunk a basketball, i.e., both players can jump very high. The first player is a tall, heavy center, and the second player is an average height, slim guard. The first player is 1.5 times the mass of the second player, and the fir...

**Physics**

Two skaters, Alan and Betsy, move toward each other on a very smooth skating rink. Their masses and speeds are respectively: 60 kg; 4.0 m/s and 50 kg; 0.4 m/s. After the skaters collide and use their hands to push each other away, Alan is moving backwards at 2.0 m/s. Taking th...

**Math**

$2000*.09=$180 $180*6months= $1080

**ACCOUNTING**

86,500 ASSETS = 50,500 LIABILITIES+OWNERS EQUITY hOW DO I SOLVE THIS PROBLEM

**Urgent Calculus Help**

Damon, is it always positive and changes sign?

**Urgent Calculus Help**

Based on the following table of values for the function w(t), answer the questions below. t and w(t) are a table with the following values: (100,2.6), (110,7.3), (120,12.7), (130,19), (140,26.1), (150,34.1) a) Which of the following best describes the derivative of w(t)? A. ch...

**Calculus Help**

Sketch the graph first. You will notice it's increasing and concave up. This should help with answering. (if not, the solution is always positive for both)

**math**

in november 2008, apple stock dropped from $105 to $95 per share, and Microsoft dropped from $21 to $20 per share. If you invested a total of $3,570 in these stocks at the end of October and sold them for $3,250 at the end of November, how many shares of each stock did you buy?

**Organiation administration**

One of the most frequent causes of game protests is: Use of officials without ratings Poor sportsmanship of spectators Use of ineligible players Failure to pay agreed fees Dishonesty of officials

**Physics**

A net force of 44N accelerates a 5.4-kg mass over a distance of 13 m. a. What is the increase in kinetic energy of the mass?

**Physics**

A rope applies a horizontal force of 208 N to pull a crate a distance of 1.91 m across the floor. A frictional force of 154 N opposes this motion. (a) What is the work done by the force applied by the rope? (b) What is the work done by the frictional force? What is the total w...

**Physics**

1

**government**

:)

**government**

people who believe voting is important have high political ----c-c-

**chemistry**

where can I find compounds that are basic in nature that are inorganic bases and organic bases?

**chemistry**

molecular wt of glucose is 180.14g/mole. What is the quanity of glucose in a 500mL IV solution of a 5% dextrose normal saline contain?

**Heron's formula**

some Problems based on heron's formula at home

**chemistry**

Sodium carbonate, Na2CO3(s), can be prepared by heating sodium bicarbonate, NaHCO3(s). 2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) Kp = 0.34 at 160 ºC If a sample of NaHCO3 is placed in an evacuated flask and allowed to achieve equilibrium at 100 ºC, what will the...

**algebra**

The debate team has m members. Each member sold 20 coupon books as a fundraiser. Write a variable expression that shows the number of coupon books the club sold.

**math**

The midpoint of two points is (6,2). If one of the points is (3,5), find the other point. x_m = (x_1 + x_2)/2 6 = (3 + x_2) / 2 = 3 + x_2 x_2 = y_m = (y_1 + y_2)/2 2 = (5 + y_2) / 2 = 5 + y_2 y_2 = Endpoint (x_2, y_2)= ( , )

**chemistry**

How many grams of calcium nitrate (molar mass = 164 g) would be formed if 0.500 g of calcium chloride (molar mass = 111 g) were reacted with an excess of silver nitrate (molar mass = 170. g

**statistics**

simple randon sampling uses a sample size n

**physics**

A car traveling at2.24m/s skids and stops in 2.55s determine the skidding distance of car

**creating enviornment**

which of the following behaviors might be resolved by changing the environment? a. two children fighting over a toy fire engine. b. children wandering rather than participating in activities during center time. c. children climbing on furniture d. all of the above

**creating environment for learning**

thank you

**creating environment for learning**

b

**creating environment for learning**

tenille is sitting with a group of preschool children at lunch time. which of the following is an example of an open-ending question? a. do you like apples or oranges better b. what are the ways that apples and oranges are alike? c. what color are the beets? d. what do you say...

**creating environment for learning**

its d

**creating environment for learning**

which of the following behaviors might be resolved by changing the environment? a. two children fighting over a toy fire engine. b. children wandering rather than participating in activities during center time. c. children climbing on furniture d. all of the above

**English**

Is the usage of me and I correct in the following sentences? If not, what would be the correct way to say these sentences? 1. I wish I had known about these picture board systems then, as it may have enhanced the communication between the children and me. 2. It was frustrating...

**Wood working**

If I have a board 31 1/4 " long and want 13 stripes on it how wide will each stripe be

**statistics**

Select which of the following are examples of parameters from these examples. Question options: The probability that a ticket with be a winner is .2 (or a 20% chance) The proportion of winning tickets in the sample of 100 99% of samples will have between 37% and 43% of voters ...

**ph208**

What would be the most plausible message that Groundhog Day is communicating about the relation between ethical standards and individual happiness? (Points : 1)

**pre-cal**

if the helicopter is moving forward at 30 mph and drops 400 feet in the elevation while the vehicle is moving 48 mph, how does the angle of depression change after 10 minutes?

**Physics**

A large store escalator that is designed to transfer customers to one floor to another, a vertical distance of 8.0m. It takes each person 20 seconds to ride from bottom to top of the escalator. Explain how you would determine the power of the escalator motor.

**Physics**

A person with a mass of 55kg climbs a tower with a height of 11m in 25 minutes. What power is produced?

**Calculus help**

assume that the initial deposit is $20000 and the nominal annual interest rate is 5.7%. Determine the amount in the account in 10 years if the interest is compounded as follows (round your answers to the nearest dollar): (a) Annually: P=20000(1.057)^10 (b) Monthly: (c) Weekly ...

**physics**

An object with a mass of 50.0 g displaces 230.0 ml of water when it is completely immersed. What is the buoyant force on the mass? (Use g = 9.8 N/kg as necessary.)

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