06/03/16

The mass of an atom of an element A is eight times a.m.u .What is the relative atomic mass of A?
The mass of an  atom of an element A is eight times the mass of C12 isotop.What is the relative atomic mass of A?
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06/02/16

Math question: If X decreases by...
Given the equation 5x+2y= 6   If x decreases by 4 units, what is the corresponding change in y?   If y decreases by 20 units what is the corresponding change in x?
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06/01/16

Linear equations/ algebra
( y=ax+b)   A. Why will the y intercept always be "b"? B. Why will the slope always be "a"? C. What will the line look like if "b" is a negative number? D. What will the line look like if "a"... more
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06/01/16

Slope, y and x intercept
What is the slope, y an x intercept if any for:   f(x)=4
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06/01/16

What is the mass of 4.00 mol of Ca3(PO4)2
What is the mass of 4.00 mol of Ca3(PO4)2
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06/01/16

Fill in the Blank: Potential Energy
A 0.50-kg sphere at the top of an incline has a potential energy of 8.0 joules relative to the base of the incline. Rolling halfway down the incline will cause the sphere's potential energy to be... more
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06/01/16

What is the mass of the car?
A rollercoaster track provides 6400 N of centripetal force on a rollercoaster car. The car travels at a speed of 22 m/s as it rounds a horizontal curve with a radius of 15 m. What is the mass of... more
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06/01/16

Roller Coasters Accelerating
Are the following roller coasters accelerating? Yes or No? And explain why please. A roller coaster speeding up? A roller coaster speeding down? A roller coaster moving in a straight lin at... more
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06/01/16

Bathroom Scale: Motion
A 750-Newton man is standing on a bathroom scale in an elevator. When the elevator is moving, the man notices that the scale is reading 780 N. How would you describe the motion of the elevator?  
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06/01/16

Calculate the amount of heat (in Joules) transferred when you dissolved ammonium chloride in water.
Help me with this question please, I can't figure it out.
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06/01/16

Calculate the amount of heat (in Joules) transferred when you dissolved calcium chloride in water.
Help me with this question please
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05/31/16

A 36- degree counterclockwise rotation centered at the origin sends the point A=(6,3) to the image point A'.
To three decimal places, find coordinates for A'.     Please help get me the answer.
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05/31/16

Rational numbers
Two motorcycles made the same 315 mile drive. One motorcycle traveled 10 mph faster than the other and arrived 2 hours earlier. Find the speed of each motorcycle
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05/31/16

what is the best option to verify sec(y)cos(y)=1
options   a. cot u =sin (u)/cos(u) b. sec(-u)=sec(u) c. 1+tan^2(u)=sec^2(u) d.cos (u)=1/sec(u)  
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05/31/16

Prove/disprove question regarding matrix-vector multiplication and linear independence
If {Bv1,...,Bvk} is a linearly independent set in Rk where B is a k x n matrix, then {v1,...,vk} is a linearly independent set in Rn
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05/29/16

Acceleration, Safe or Not?
At the bottom of the loop of your roller coaster, the velocity is 30 m/s and the radius of the loop is 50 m. Is the amount of acceleration riders will experience in this loop considered safe? Why?... more
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05/29/16

Decreasing Centripetal Force
You are a roller coaster engineer, and safety inspectors tell you that your roller coaster has too much centripetal force. What can you do to decrease the centripetal foce acting on your roller... more
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05/29/16

Weight of an Object
A spring has a spring constant of 200 N/m. It stretches a distance of 3 m when an object is hung from the spring. Use Hooke's Law to find the weight of the object.
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05/29/16

Physics Practice Problems
The following questions refer to a pop-up toy with a mass of 0.35 kg. The toy's spring compresses 0.04 m, and has a spring constant of 3,000 N/m.   How high does the pop-up toy go? What is the... more
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05/28/16

How many moles of water are there in a sample that has a mass of 1.413 g
help me with this one please with steps
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05/28/16

You measure the mass of a mystery object to be 658 g. The actual mass of the object is 755 g. What is your percent error?
From interactive achievement textbook ??? 
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05/28/16

The points A=(0,13) and B=(12,5) lie on a circle whose center is at the origin.
Write an equation for the perpendicular bisector of segment AB. Notice that this bisector goes through the origin; why was this expected?
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05/27/16

This question is super tricky for me, please help!
An observer views four identical objects that are traveling at speeds close to the speed of light. Can their lengths be used to rank the objects according to their speeds?A. No. The length of each... more
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05/27/16

a linear spring is used in a physics lab. What's the slop of time verse mass?
A linear spring of spring constant K is used in a lab experiment. A block of mass m is attached to the spring and the resulting period T of the simple harmonic oscillations is measured. Blocks of... more
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05/27/16

Speed Question
Joe and his dog Freddie are in a park with Joe standing 60 feet due south of Freddie. Freddie starts to run due east and without stopping or changing direction, catches a ball thrown to him by Joe.... more
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