Saturday

December 3, 2016
Total # Posts: 36

**Physics**

A 50-kg ice skater moves around a bend at 8 m/s. The radius of the bend is 8 m. Centripetal force is provided by friction between the blade of the skates and the ice. What is the amount of centripetal force?

*November 30, 2016*

**Physics**

help me

*October 1, 2015*

**PHYSICS**

a swimmer develops an average of 200 watts in a distance of 100m in 80 seconds. what is the force resistance in the water?

*July 12, 2014*

**PHYSICS**

79X190 find (a) the net electrical charge of the nucleus, (b) the number of neutrons, (c) the number of nucleons, (d) the approximate radius of the nucleus, and (e) the nuclear density. I have already determined B and C. I only need to know the equations for A, D, and E Thank you

*May 2, 2014*

**geometry**

The sides of a quadrilateral are 3, 4, 5, and 6. Find the length of the shortest side of a similar quadrilateral whose area is 9 times as great.

*August 17, 2012*

**calculus**

4. You are at Lowes and a man is leaning against three sections of fencing that are 6,7 and 12 ft long. A Lowe’s person tells him to discard the 12 ft section and buy a 10ft section. She informs the customer that this would save money and would fence a bigger triangular ...

*April 30, 2012*

**calculus**

3. Your neighbor puts tiger on his flat roof shed. You and another neighbor argue over the ht of the tiger. At a distance of 80 ft from the shed your angle of elevation from the ground level to the top of the shed is 5.74 degree. The angle of elevation to the top of the tiger ...

*April 30, 2012*

**calculus**

2. A spin balancer rotates the wheel of the car at 480 revolutions per min. if the diameter of the wheel is 26 in what road speed is being tested in the miles per hour? Round to the nearest tenth

*April 30, 2012*

**calculus**

1. A hill with a 35 degree grade (incline with horizontal) is cut down for a roadbed to a 10 degree grade. If the distance from the base to the top of the original hill is 800 ft., How many vertical ft will be removed from the hill rounded to the nearest ft

*April 30, 2012*

**College Algebra**

Which of the following is equivalent to (2x-3)^2=25 ? A) 2x - 3 = 5 B) 2x - 3 = -5 C) 2x - 3 = 5 and 2x - 3 = -5

*October 4, 2011*

**math **

how do you make 9=6 (using roman numerals ) be equal on both sides

*September 20, 2011*

**physics**

In the ballroom of a historic palace near Paris, a chandelier hangs from the ceiling by a cable. The mass of the chandelier is 390 kg. Find the tension in the cable.

*February 25, 2011*

**physics**

A 10-kg duffle bag is undergoing a vertical acceleration of 0.050 m/s2 (positive for up, negative for down), while its owner is holding it with an upward force. What is the magnitude of this force?

*February 25, 2011*

**physics**

A physics professor lifts her 9.0-kg briefcase at constant speed with an upward force. Find the magnitude of her force.

*February 25, 2011*

**physics**

A physics professor lifts her 9.0-kg briefcase at constant speed with an upward force. Find the magnitude of her force.

*February 25, 2011*

**physics**

Actually I didn't know that formula haha. Thanks!

*February 25, 2011*

**physics**

A 32.0-kg penguin on frictionless ice holds onto the end of a horizontal spring with spring constant 250 N/m and oscillates back and forth. What is its period of oscillation?

*February 25, 2011*

**physics**

A 50-kg penguin stands on ice. A helium balloon is attached to the penguin by means of a harness and pulls upward with a force of 90 N. What is the normal force of the ice on the penguin?

*February 25, 2011*

**physics**

A physics professor lifts her 9.0-kg briefcase at constant speed with an upward force. Find the magnitude of her force.

*February 25, 2011*

**Math**

How do we know the ith of an invertible matrix B is orthogonal to the jth column of B^-1 , if i is not equal/unequal to j?

*December 8, 2010*

**science**

help me

*December 5, 2010*

**Math**

What is the simplified sum when you evaluate 10/15 + 1/4

*June 12, 2010*

**12th grade**

Id say... b

*April 27, 2010*

**algebra 1**

x^2-18x+___=( )^2

*April 25, 2010*

**12th grade agebra 2**

For the first one : You put X = x² Then you have (variable change) : X² - 6X + 8 = 0 And you use common tools to solve that (use delta). You find X = 2 or X = 4. You have x² = X, so x = sqrt(X) or x = -sqrt(X). Here, the solutions are sqrt(2), -sqrt(2), 2, -2. ...

*April 20, 2010*

**12th grade**

Simple equation : X = -sqrt(2)/sec(1/4) = -sqrt(2)*cos(1/4) It's not a round value.

*April 19, 2010*

**12th grade**

I don't agree Anonymous. To solve 2nd degrees equations (aka find the roots of a trinomial function), you have first to put it to this form : ax² + bx + c = 0 (where a, b and c are reals) Then you have to calculate its discriminant (its delta) : Δ = b² - 4ac...

*April 18, 2010*

**Economics**

real gdp calculates the gdp for a longer period of time

*April 14, 2009*

**science**

What holds atoms together in a molecule?

*December 18, 2008*

**science**

What is matter in which every particle is identical?

*December 18, 2008*

**science**

what is the increase in volume as temperature increases?

*December 18, 2008*

**Geometry**

I need help on the things like tevrey square is a rectangle please helpp!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

*May 12, 2008*

**Geometry**

I know that a rectangle is a square but I am not sure of the rest.

*May 12, 2008*

**Geometry**

IS Evrey rectangle a square or is evrey rhombus a paralleogram. I forgot these things need help!

*May 12, 2008*

**Fourth Grade Geometry**

Is evrey rectangle a square? Or is evrey parallegram a rhombus I forgot.

*January 9, 2008*

**AP CHEM FULL ?**

could you please explain how you know that compound E is NH3 and compound A is nitric acid

*December 2, 2006*

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