Tuesday

July 22, 2014

July 22, 2014

Total # Posts: 26

**Physics**

Help please, Four charges are placed at the four corners of a square of side 15 cm.The charges on the upper left and right corners are +3 uC and -6 uC respectively. The charges on the lower left and right corners are -2.4uC and-9 uC respectively. The net force on -6uC charge i...

**physics**

Four charges are placed at the four corners of a square of side 15 cm.The charges on the upper left and right corners are +3 uC and -6 uC respectively. The charges on the lower left and right corners are -2.4uC and-9 uC respectively. The net force on -6uC charge is ?

**physics**

If the sound waves detected by the dector is the same as the frequency of the source, what can we conclude about the motion of the source and detector?

**Grenada**

John has a 25-gallon fish tank. John filled his tank today with 23-gallons of water. The water evaporates at a rate of 1.5 gallons per week. John adds 2 gallons to the tank every other week. At what following time will the tank contain 16.5 gallons?

**calc**

What function should be used to maximize the volume of an open box that has a surface area of 24 and has a square bottom. x is the bottom and h is the height.

**calc**

Assume that a rectangle with sides x and y is expanding with time. Let y = 2x and x(t)=2t+5. What is the rate of change of the area when t=2?

**calc -rates**

assume a circle is expanding with time where r= t+3. What is the formula for rate of change of an area of the circle with reswpect to time?

**calc**

find f(X)=(sin x)*1/2

**CALC-LIMITS**

F(X)= x-2/(x^2-4) is continuous at x=1 and why as limits approach from 1+ and 1-

**Calc-optimization**

Ann wants to build an enclosed area behind her house. One wall of the enclosed area will be the back of the house. She needs the total to be 120 sq feet. She wants to minimize the cost of fence materials. For the sides (W) fence materials cost $3/ft, for the length (L) they co...

**Calc and Physics**

Damon and Reiny. Thanks for your quick and thorough responses.

**Calc-optimization**

Given y=(x)^1/2, find the closest point to (3/2,0)

**Calc-extrema**

Find all relative and maximum extrema in ht efunction k(x)=(x^2-4)^-2 on the interval [-3,3].

**calc-tangent line**

find the equation to the line tangent to y=(x+3)^(1/3) at x=-3.

**Calc-extrema**

Find all relative extrema in the function h(x)=cos(2pix/3) on the interval [0,2]

**Physics-science**

A football player weighing 75 kg running at 2 m/s toward west tackles a 70 kg player running 1.5 m/s in the opposite direction. What is the decrease in kinetic energy during the collision?

**Physics-bullet travel distance**

A bullet is fired at 45 degrees with respect to horizontal with a velocity of 50 m/s. How long is the bullet in the air? What is the range?

**Physics -parachute**

A man is descending in a parachute of total mass 125 kg with a constant velocity. What is the air resistance the parachutist experiences in N?

**Physics-rain velocity to bike**

Rain falls vertically downward with a velocity of 2.4m/s. A boy moves at a speed of of 6m/s east in a bicycle with an umbrella. What is the velocity of the rain with the respect to the boy. What angle from horizontal should he hold his umbrella?

**economics**

If trade occurs between Francia and Galacia, which nation should export what product? Why?

**alegbra**

Which of the following are examples of inferential statistics? Check all that apply. A.Finding the average (mean) of a set of numbers B.Testing every lightbulb produced by a company to confirm that each one works C.Testing random samples of lightbulbs produced by a company to ...

**math**

explain how to find ans. a clock has a circumference of 166cm. what is the diameter

**math**

a pizza has a circumference of 47.1in. what is the radius

**math**

you have two bikes that have same reaction times,one runs a 6.o with 140 60 foot the other runs 5.9 with 150 60 foot.who wins?

**3rd grade**

Explain how you can use a hundred chart to subtract 12 from 46.

**us history**

someone forgot to do homework?

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