Friday

February 27, 2015

February 27, 2015

Total # Posts: 1,930

**Physics**

It's not given.
*June 19, 2012*

**Physics**

A small circular object with mass m and radius r has a moment of inertia given by I = cmr^2. The object rolls without slipping along the track shown in the figure. The track ends with a ramp of height R = 3.0 m that launches the object vertically. The object starts from a ...
*June 19, 2012*

**Physics**

A force, F = (3x + 4y) N, is applied to an object at a point whose position vector with respect to the pivot point is r = (3x + 3y + 3z) m. Calculate the torque created by the force about that pivot point. I know that torque = -12x + 9y + 3z, but why is -12x negative? Thank ...
*June 18, 2012*

**Physics**

A solid ball and a hollow ball, each with a mass of 2 kg and radius of 0.1 m, start from rest and roll down a ramp of length 2 m at an incline of 34°. An ice cube of the same mass slides without friction down the same ramp. What is the speed of the solid ball at the bottom...
*June 18, 2012*

**Physics**

10. A yo-yo is made by wrapping a 2-m long string around a 500-g 10-cm diameter uniform disk. The string is fastened to the ceiling, and the yo-yo is released. What is the tension in the string as the yo-yo falls? A.9.8N B.1.6N C.4.9N D. 0.49N E.3.3N The answer is B. How do I ...
*June 17, 2012*

**math**

75 is 5/2 of greg's age
*June 17, 2012*

**help**

Post those question you are having trouble with on this site and one of the tutors should answer your question.
*June 16, 2012*

**Physics**

How is it known that the mass of the cutout is centered at (2/3)R?
*June 16, 2012*

**Physics**

5. A circular pizza of radius R has a circular piece of radius R/3 removed from one side. The center of mass of the pizza with the hole is at a distance of_____ from the center of mass of the original pizza. A. R/20 B. R/2 C. R/30 D. R/3 E. R/12 The answer is E, but why is it ...
*June 16, 2012*

**Physics**

Thank you.
*June 16, 2012*

**Physics**

A ball of mass m = 0.2 kg is attached to a (massless) string of length L = 2 m and is undergoing circular motion in the horizontal plane (imagine a wave swinger ride at the amusement park). What should the speed of the mass be for θ to be 39°? What is the tension in ...
*June 16, 2012*

**Physics**

A ball having a mass of 4 kg is attached to a string 1 m long and is whirled in a vertical circle at a constant speed of 23 m/s. (a) Determine the tension in the string when the ball is at the top of the circle. (b) Determine the tension in the string when the ball is at the ...
*June 14, 2012*

**math**

How many cement blocks are needed to construct a wall 0.5 ft. thick, 6 ft. high, and 60 ft. long if it takes 10 standard cement blocks to make 1 cubic foot of wall?
*June 14, 2012*

**math**

A pile of coal is stored in a barrel-shaped bin whose base has a radius of 3 meters. The height of the pile measures 1.5 meters. What volume of coal is in the pile (to the nearest hundredth)?
*June 14, 2012*

**Math**

You are to paint the globe held aloft by a statue of Atlas. Its diameter is 10.5 in. How much surface area must you cover with paint if 27 square inches does not need to be painted (to the nearest hundredth)?
*June 14, 2012*

**Physics**

A discus thrower (with arm length of 1.2 m) starts from rest and begins to rotate counterclockwise with an angular acceleration of 3.6 rad/s2. (a) How long does it take the discus thrower's speed to get to 5.1 rad/s? (b) How many revolutions does the thrower make to reach ...
*June 14, 2012*

**Physics**

Thank you.
*June 14, 2012*

**Physics**

1. A slingshot is used to launch a 5.00-gram rock. The effective spring constant of the slingshot is 200 N/m. By what distance must the slingshot be stretched in order to launch the rock at 20.0 m/s?
*June 14, 2012*

**early childhood**

When children learning. Alphabet which do they recognize first. A.oc B.kc C.br D.te
*June 12, 2012*

**Physics**

A system consists of two particles. Particle 1 with mass 2.0 kg is located at (2.0 m, 6.0 m) and has a velocity of (2.1 m/s, 4.1 m/s). Particle 2 with mass 4.5 kg is located at (4.0 m, 1.0 m) and has a velocity of (4.6 m/s, 4.6 m/s). Determine the position and the velocity of ...
*June 12, 2012*

**Physics**

The density of a 5.0-m long rod can be described by the linear density function λ(x) = 140 g/m + 14.8x g/m2. One end of the rod is positioned at x = 0 and the other at x = 5 m. (a) Determine the total mass of the rod. (b) Determine the center-of-mass coordinate. I found ...
*June 11, 2012*

**Physics**

A fire hose 3.8 cm in diameter is capable of spraying water at a velocity of 20 m/s. For a continuous horizontal flow of water, what horizontal force should a fireman exert on the hose to keep it stationary? I know the answer is 454 N but how does one arrive at this answer?
*June 11, 2012*

**Managerial Accounting**

What is FedEx’s strategy for success in the marketplace? Does the company rely primarily on a customer intimacy, operations excellence, or product leadership customer value proposition? What evidence supports your conclusion? What are FedEx’s four main business ...
*June 10, 2012*

**physics**

A motor drives a rope drum of 820 mm diameter, which in turn drags a component of mass 650 kg, 175 m up a slope that makes an angle of 8 degrees to the horizontal. the component starts from rest and uniformly reaches a velocity of 5.3 m/s on completion of its journey. use d&#...
*June 7, 2012*

**English 125 Introduction to literature**

The performance qualities of drama and poetry
*June 6, 2012*

**Physics**

A 0.421-kg ball has an elastic, head-on collision with a second ball that is initially at rest. The second ball moves off with half the original speed of the first ball. (a) What is the mass of the second ball? (b) What fraction of the original kinetic energy (ΔK/K) is ...
*June 6, 2012*

**Physics**

I think my book has a typo. It should say book, not ball.
*June 5, 2012*

**Physics**

Stuck in the middle of a frozen pond with only your physics book, you decide to put physics in action and throw the 9-kg book. If your mass is 45 kg and you throw the book at 10 m/s, how fast do you then slide across the ice? (Assume the absence of friction. Let the direction ...
*June 5, 2012*

**Science/Biomaterials**

Hooke's law relates the amount of strain a material to the absolute amount of force applied. True or False?
*June 5, 2012*

**Science/Biomaterials**

Where did you find this equation? I didn't find anything like that.
*June 3, 2012*

**Science/Biomaterials**

Given the following properties, how much stretch would you expect to occur in a specimen of polyethylene to which a tensile load is applied? l = change in length Length = 10 cm Cross-Sectional Area = 1 cm2 Young's Modulus = 200 GPa Applied Load = 1000 kN Find answer in cm...
*June 3, 2012*

**Physics**

If it takes an average force of 5.4 N to push a 4.8-g dart 5.4 cm into a dart gun, assuming the barrel is frictionless, how fast will the dart exit the gun?
*June 2, 2012*

**Physics**

Suppose you throw a 0.054-kg ball with a speed of 11.5 m/s and at an angle of 31.8° above the horizontal from a building 13.1 m high. (a) What will be its kinetic energy when it hits the ground? (b) What will be its speed when it hits the ground?
*June 1, 2012*

**physics **

Find the diameter of a gold coin that has a weight of 1.00 (troy) oz and a thickness of 3.00 mm.
*May 31, 2012*

**Physics**

How much work is done against gravity in lifting a 6.5-kg weight through a distance of 21 cm?
*May 28, 2012*

**Physics**

Oh sorry, I copied and pasted the wrong thing. This question has already been solved. Look at the related questions.
*May 28, 2012*

**Physics**

Never mind, I figured this one out.
*May 28, 2012*

**Math**

how much simple interest would Karen earn on $300 at 6% for 6 months
*May 27, 2012*

**Physics**

Yes, Wnet is 105 J. Thank you.
*May 27, 2012*

**Physics**

A man throws a rock of mass m = 0.310 kg straight up into the air. In this process, his arm does a total amount of work Wnet = 105 J on the rock. Calculate the maximum distance, h, above the man's throwing hand that the rock will travel. Neglect air resistance.
*May 27, 2012*

**Physics**

An ideal spring has the spring constant k = 414 N/m. Calculate the distance this spring must be stretched from its equilibrium position for 22 J of work to be done in meters.
*May 27, 2012*

**Algebra**

According to a poll conducted in a company, 47% of the employees regularly use the internet while at work. You conduct a similar survey at your mother's office where there are 250 respondents. What is the probability you find between 102 and 117.5 employees who use the ...
*May 24, 2012*

**Physics**

A hanging mass, M1 = 0.78 kg, is attached by a light string that runs over a frictionless pulley to a mass M2 = 1.48 kg that is initially at rest on a frictionless table. Find the magnitude of the acceleration, a, of M2 in m/s^2.
*May 24, 2012*

**physics**

7. Two cars are moving. The first car has twice the mass of the second car, but only half as much kinetic energy. Then, both cars increase their speed by 8.00 m/s. They then have the same kinetic energy. The original speeds of the two cars are, respectively, A. v1 = 5.66 m/s, ...
*May 23, 2012*

**Physics**

Salmon often jump upstream through waterfalls to reach their breeding grounds. One salmon came across a waterfall 1.30 m in height, which she jumped in 1.3 s at an angle of 72° to continue upstream. What was the initial speed of her jump? (Assume the launch angle is ...
*May 21, 2012*

**Physics**

A car drives straight off the edge of a cliff that is 68 m high. The police at the scene of the accident note that the point of impact is 148 m from the base of the cliff. How fast was the car traveling when it went over the cliff?
*May 21, 2012*

**Physics**

A car drives straight off the edge of a cliff that is 68 m high. The police at the scene of the accident note that the point of impact is 148 m from the base of the cliff. How fast was the car traveling when it went over the cliff?
*May 21, 2012*

**Physics**

Yes, it's a super frog.
*May 21, 2012*

**Physics**

By trial and error, a frog learns that it can leap a maximum horizontal distance of 1.4 m. If, in the course of an hour, the frog spends 32% of the time resting and 68% of the time performing identical jumps of that maximum length, in a straight line, what is the distance ...
*May 21, 2012*

**Physics**

Never mind, figured it out.
*May 21, 2012*

**Physics**

A truck travels 2.85 km north and then makes a 90° left turn and drives another 4.90 km. The whole trip takes 4.50 min. (a) With respect to a two-dimensional coordinate system on the surface of Earth such that the y-axis points north, what is the net displacement vector of...
*May 21, 2012*

**Criminal Law**

Max and Rich go hunting. They both know the area where they are hunting, and they separate to hunt from different positions. They are both wearing bright orange hats and vests as per hunting regulations. Max sees something moving in the brush. He does not see anything orange, ...
*May 21, 2012*

**Physics**

A runner of mass 51.5 kg starts from rest and accelerates with a constant acceleration of 1.35 m/s2 until she reaches a velocity of 5.7 m/s. She then continues running with this constant velocity. (Take the direction the runner is going to be the positive direction. Indicate ...
*May 18, 2012*

**Physics**

What is the velocity at the midway point of a ball able to reach a height y when thrown with an initial velocity v0? (Assume the ball is thrown upward and that up is the positive direction. Use the following as necessary: y and g. ) Someone posted this question before and was ...
*May 18, 2012*

**Physics**

An object is thrown vertically and has an upward velocity of 5 m/s when it reaches three fourths of its maximum height above its launch point. What is the initial (launch) speed of the object?
*May 18, 2012*

**Physics**

Never mind, I figured this one out.
*May 18, 2012*

**Physics**

An object is thrown vertically and has an upward velocity of 5 m/s when it reaches three fourths of its maximum height above its launch point. What is the initial (launch) speed of the object?
*May 18, 2012*

**Physics**

Well, then I made a calculation error because the two equation gave me a different answer.
*May 18, 2012*

**Physics**

Thank you. This was really helpful. I was never given this equation. The only equation I got was: y= y_o + v_yo - 1/2(gt^2)
*May 18, 2012*

**Physics**

An object is thrown upward with a speed of 21.5 m/s. How high above the projection point is it after 2.06 s?
*May 18, 2012*

**Physics**

Oh, sorry I forgot to post the rest of the question. (a) How far has she run after 64.7 s? (b) What is the velocity of the runner at this point?
*May 18, 2012*

**Physics**

A runner of mass 51.5 kg starts from rest and accelerates with a constant acceleration of 1.35 m/s2 until she reaches a velocity of 5.7 m/s. She then continues running with this constant velocity. (Take the direction the runner is going to be the positive direction. Indicate ...
*May 18, 2012*

**Physics**

A bullet is fired through a board 12.1 cm thick, with a line of motion perpendicular to the face of the board. If the bullet enters with a speed of 375 m/s and emerges with a speed of 205 m/s, what is its acceleration as it passes through the board? (Take the direction the ...
*May 18, 2012*

**algebra**

(a + 8) x (a +2) To check this, you can use FOIL (a + 8) x (a +2) (a x a)+(8a) +(2a) + (8 x 2) a^2 + (8 + 2)a + 16 a^2 + 10a + 16
*May 18, 2012*

**math**

In his pocket, a boy has 3 red marbles, 4 blue marbles, and 4 green marbles. How many will he have to take out of his pocket to ensure that he has taken out at least one of each color?
*May 10, 2012*

**Chemistry**

Complete and balance the chemical equation. Be sure to include the states of the reactants and products. SO2(g)+O2(g) → thanks
*May 4, 2012*

**intro to chemistry (college)**

A 64.8 g mixture of the compounds potassium sulfide and calcium oxide is 17.1 % by mass potassium sulfide. The compound calcium oxide is 71.5 % by mass calcium. Calculate the mass (g) of oxygen in the mixture. mass % = mass part/mass whole x 100. I attempted the problem by ...
*May 3, 2012*

**Chem**

Dissolving 3g of ascorbic acid in 50g of acetic acid lowers the freezing point of acetic acid by 1.33degreesC. What is the molecular mass of ascorbic acid?
*May 2, 2012*

**math**

128fl oz in a gallon
*May 1, 2012*

**english**

This summer my best friend and I will be going to a theme park. I always enjoy myself when I am with my friend so I am sure that the trip will be fun. I have yet to go to this theme park, and according to one of my classmates it holds the worlds highest coaster. I cant wait ...
*May 1, 2012*

**Physics (Spring force constant)**

Please help me i cant figure out what goes in the blanks and this is the last question of my gizmo... THANKS! If the spring constant is 100 N/m, the period is equal to the _____________ _____________ of the mass multiplied by _____________. If the mass is held constant at 1.0 ...
*May 1, 2012*

**Calculus**

you have 1000 yards of fencing and you plan to use the fencing to make 2 enclosures, one circular and one a square. How much of the 1000 yard of fencing should be used for each region if you want to maximize the combined area of both regions Let x yards of fence be used for ...
*April 30, 2012*

**Calculus**

you have 1000 yards of fencing and you plan to use the fencing to make 2 enclosures, one circular and one a square. How much of the 1000 yard of fencing should be used for each region if you want to maximize the combined area of both regions Let x yards of fence be used for ...
*April 30, 2012*

**science**

how is the Maunder minimum and the little ice age related events?
*April 30, 2012*

**chemistry**

1.0 M aqueous solutions of AgNO3 , Cu(NO3 )2 and Au(NO3 ) 3 are electrolyzed in the apparatus shown, so the same amount of electricity passes through each solution. If 0.10 moles of solid Cu are formed how many moles of Ag and Au are formed?
*April 27, 2012*

**math**

What's the length of the arc ab and the area of the sector aob
*April 27, 2012*

**math**

Find the terms. Leave coefficients as factorials term with t^5 in (v-t)^17 term with x^10 in (x+y)^19
*April 26, 2012*

**math**

the conversion for .1959 cm = m
*April 26, 2012*

**CHEMISTRY**

What is the [H+] in a 0.10 M solution of ascorbic acid,C6H8O6?
*April 25, 2012*

**Physics**

A ball is thrown from a building standing 30m high, landing 10m away from the building 3.2 seconds after it was thrown. Find the angle above the horizontal and the initial velocity of the ball
*April 25, 2012*

**math**

If 3feet*50metre is Rs.8720,how much would 2feet*40metre cost?
*April 24, 2012*

**math**

How much money should be invested today in order to have $100,000 in an account after 40 years if the rate is 6.8% compounded quarterly?
*April 23, 2012*

**algebra 2**

Jennifer invested $2,500 in an account earning 3.5% interest compounded continuosly. How much money will she have in the account after 15 years?
*April 23, 2012*

**math**

A ramp that is 4 ft., 3 ft.at one end. I want a 30% slope to the ground; how long should the ramp be?
*April 23, 2012*

**pre-calc help**

cos^2(x/2)-sin^2(x/2) 2sin(x/2)cos(x/2)
*April 21, 2012*

**lOTS OF PHYSICS :)**

41. Is the speed of light constant as it passes through transparent materials? Yes, the speed of is always constant No, light travels at different speeds through different materials 42. A lens that causes light to diverge is A converging lens A diverging lens Fish-eye lens 43...
*April 18, 2012*

**pHYSICS hELP rATIONAL SPEEDS OF DISKS**

If rotational speed of a disc remains constant, what happens to the speed of a point on the disc if its distance from the axis is doubled? It stays the same It also doubles It triples It quadruples
*April 18, 2012*

**physics**

A projectile is launched at an angle of 600. What other angle would give the same range for the projectile if we neglect air resistance?
*April 18, 2012*

**Physics**

A ferryboat traveling at a speed of 30 km/h attempts to cross a river with a current of 5 km/h. What is the boat's speed relative to the shore? 8 km/h 25 km/h 30.4 km/h 32.8 km/h
*April 18, 2012*

**anatomy and physiology**

what lifestyle factors of the muscle affect the growth, development, size and/or healing (positively or negatively) of the tissue?
*April 16, 2012*

**anatomy and physiololgy**

what lifestyle factors of the bone affect the growth, development, size and/or healing (positively or negatively) of the tissue.
*April 16, 2012*

**science**

A 1.4 kg ball and a 3.0 kg ball are connected by a 1.0 m long rigid, massless rod. The rod is rotating cw about its center of mass at 24 rpm. What torque will bring the balls to a halt in 4.2 s?
*April 15, 2012*

**English (Comma Question)**

I think the first sentence is correct.
*April 12, 2012*

**English (Comma Question)**

Which of the following sentences is correct? "James arrives and, after a period of confusion, Mary's secret is revealed." "James arrives, and after a period of confusion, Mary's secret is revealed." "James arrives and after a period of ...
*April 12, 2012*

**8th grade math**

A truck rental company charges $20 plus 9 cents per mile.Joe's friend offers to rent Joe his truck for $35 and won't charge him mileage. What is the minimum number of miles Joe has to drive to save money using his friend's truck? 17?, 55?, 121? or 167?
*April 12, 2012*

**Finance**

A grocery store manager must decide whether to buy four rug cleaners to rent to customers. The manager estimates that the first would yield $200 a year, the second $150, the third $75, and the fourth $20. If the interest rate is 12 percent and each rug cleaner costs $500, how ...
*April 12, 2012*

**geometry**

easy simply 286x2= whatever than do 63x4= whatever your thanks ( come from canada just joking ) your welcome :-)
*April 11, 2012*

**chemistry**

What would the final freezing point of water be if 3 mol of sugar were added to 1 kg of water (Kf = 1.86C/(mol/kg) for water and i = 1 for sugar)?
*April 11, 2012*

**physics**

The system in the Figure is in equilibrium. A mass M1 = 242.0 kg hangs from the end of a uniform strut which is held at an angle theta = 41.0o with respect to the horizontal. The cable supporting the strut is at angle alpha = 27.0o with respect to the horizontal. The strut has...
*April 10, 2012*

**physics**

The weightless horizontal bar in the figure below is in equilibrium. Scale B reads 4.00 kg (N.B. as you know, the scale should read N, but no one told the manufacturer). The distances in the figure (which is not to scale) are: D1 = 9.0 cm, D2 = 8.0 cm, and D3 = 6.5 cm. The ...
*April 10, 2012*

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