04/04/18

Mr smith keeps ducks and pigs on his farm
Mr smith keeps ducks and pigs on his farm. One day he counted of 125 heads and 360 legs. Find the total number of ducks and pigs    
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04/03/18

The half life of a radioactive element is 23 days. How long until 21% of the initial amount remains? Include units in your answer?
The half life of a radioactive element is 23 days. How long until 21% of the initial amount remains? Include units in your answer?
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04/03/18

Find an expression for the perimeter of a rectangle with the given area.
A= x2 + 24x -81
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04/03/18

DEMOIVRE's THEOREM
Use DeMoivre's Theorem to find the indicated power of the complex number. Write the result in standard form.(3 − 2i)^8
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04/03/18

How to find a polynomial when only given its zeros
find a 5th degree polynomial function with real coefficients that has zeros: -2,3, and 2+i
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04/03/18

if r=10 cm, find c in terms of pie
if r=10, find c in terms of π
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04/03/18

This question involves finding the velocity of the center of mass of colliding objects that stick together.
Consider the head-on collision of two masses,m1 = m, with initial velocity v1 = v0, andm2 = 2m with its initial velocity v2 =v0/2.After the collision they stuck together.Find the velocity of the... more
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04/03/18

What is the heat capacity of a 30.0 gram sample of matter that cools off to 25c from 100c when 100.0 grams of 20c water are added to it?
Don't know how to start it please help.
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04/03/18

While waiting for a video game to download, you notice that 30 percent of 32000 kilobytes have been downloaded so far. How many kilobytes have been downloaded?
It includes percents
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04/03/18

Rectilinear Motion
An object has a constant acceleration of 30 ft/sec^2, an initial velocity of -10 ft/sec, and an initial position of 4 ft. Find the position function, s(t), describing the motion of the object. 
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04/03/18

find the roots of f(x)=(e^x-e^Π)(e^x-Π)
Find the roots of f(x)=(e^x-e^π)(e^x-π)   e is the Euler's number
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04/03/18

How much energy needs to be removed from 25 g of 110 °C degree steam to turn it into -10 °C ice?
I am stuck on this question please help.
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04/03/18

How many grams of water would boil if I added 2,552,000 J of energy to a large cauldron of 80.0 °C water?
Please help with this question and how to set it up.
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04/03/18

A boat heading across river at velocity of 25 mph perpendicular to the current. The river downstream at 10 mph. What is the actual velocity of the boat
What is the answer to the question and how do we do it  
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04/02/18

Math help please??
Some college buddies decided to take a vacation in Florida together. They each had to chip in $90 forthe week’s lodging. They tried to convince three more people to go, because then the cost per... more
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04/02/18

A 10.85 g sample of aluminum at 95 C is placed in calorimeter. After 20 min, temp of the 140g of water in calorimeter increased by 3.5 C.What is the temp of Al?
Reference Info: Molar mass - 27g melt pt - 658C heat of fusion - 3948 J/G boiling pt - 2246 C Heat of vap - 8296C Specific heat as solid - .902 J/GC Specific heat as liquid - 1.80... more
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04/02/18

Find the circumference of the earth
Find the circumference of the earth of the earth in meters and write your answer in scientific notation ?The circumference of the earth is approximately 40 075 km .1)Find the circumference of the... more
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04/02/18

Cartesian Unit Vector to Polar Unit Vector
I'm having trouble understanding the following equation conceptually.  Where....R= Polar unit vectorI, J= Cartesian unit vectors   R=cos(Θ)I+sin(Θ)J   Please explain how this equation can be... more
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04/02/18

Metals and nonmetals are both good conductors.
Periodic table 
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04/02/18

How do you calculate rate of expansion of gas with temperature with a gradient of the line being 0.2?
i am doing a graph plotting in volume and temperature it has asked: How do you calculate rate of expansion of gas with temperature with a gradient of the line being 0.2? 
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04/02/18

The change in the value of acceleration of earth towards sun,when the moon comes from the position on the other side of earth in line with sun is:
(mass of moon=7.36*10 power 22 kg radius of moon's orbit=3.8*10 power 8) options are a.6.73*10 power -3 m/s square b.6.73*10 power -5 m/s square
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04/02/18

change because of temperature
An aluminium rod has a length of exactly one meter at 300K. How much longer is it when placed in a 400°C oven? I've been told the answer but not sure how to get to the answer 
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04/02/18

An alternative workout involves pulling a sled (60kg) with a rope at an incline of 15 degrees above the horizontal.
An alternative workout involves pulling a sled (60kg) with a rope at an incline of 15 degrees above the horizontal. How much force would be required to keep the 60kg sled moving at a constant... more
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04/02/18

A proton is fired at a speed of 4x10^5 m/s towards a very large nucleus and comes to a rest 0.15nm away from the atom. What is the charge of the atom?
I have been using the equation Kq1q2/r and have been making 0.15nm 1.5x10^-10 and q = 1.60x10^-19. the answer is 1.39x10^-17. I can't seem to get this answer. Thanks.
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04/02/18

What fraction of the initial potential energy of the object is lost to friction of the air?
All they gave me was the height if 5m and the speed when it hit the ground of 4.5 m/s. The object was at rest at the top.
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