4,347 Answered Questions for the topic Science

03/21/21

what would be the hypothesis? what would be  the control group? What would be the experimental variable? What would be the test group?
 If you were to test 1000 people on the effects of vitamin D on the density of their bones, what would be the hypothesis? what would be  the control group? What would be... more
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03/21/21

Physical Science
How does the motion of the Earth provide us with life and How does the Earth take care of us through its motion around the sun, Through the moon’s motion around the Earth?
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Science Biology Genetics

03/21/21

Human Genetics: Make a Family Tree
Make a family tree using data obtained in the survey of the woman. The proband (a woman) has one brother and two sisters, the eldest of whom has one son. The proband’s father had 3 sisters and one... more
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Science Chemistry

03/20/21

Can someone please check-over these to see if I got the correct answers?
In the following questions, an unbalanced equation is given. Balance the equation. Then add up the coefficients on both sides of this properly balanced equation and identify the total. (My answer... more
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Science Chemistry

03/20/21

Can someone please help me with this?
For the following questions, use the following table of densities.A: Gold=19.3 g/mLB: Copper=9.0 g/mLC:Iron= 7.9 g/mL D.Silver= 10.5 g/mLE. Nickel= 8.9 g/mLF: Iridium= 22.4 g/mLG: Platinum= 23.5... more
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Science Chemistry

03/20/21

Which statement is true about balancing equations?
A. Coefficients can be changed, but not made negative.B. Subscripts cannot be changed.C. The total number of atoms of each element must be the same on both sides of the equation.D. All of the... more
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Science Chemistry

03/20/21

Can someone pease help me with this question?
Which statement about the relative densities of the phases of H2O is true?A. Steam and ice have the same density.B. Liquid water and ice have the same density.C. Liquid water is denser than ice.D.... more
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Science Math Physics

03/19/21

Responding to an alarm, a 764-N firefighter slides down a pole to the ground floor, 3.4 m below. The firefighter starts at rest and lands with a speed of 3.6 m/s .
Find the average force exerted on the firefighter by the pole.Express your answer to two significant figures and include the appropriate units.
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Science Math Physics

03/19/21

At the bow of a ship on a stormy sea, a crew member conducts an experiment by standing on a bathroom scale.
In calm waters, the scale reads 755  . During the storm, the crew member observer a maximum reading of 920  and a minimum reading of 555  .A) Find the maximum upward acceleration experienced by the... more
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03/19/21

physics help I am very confused
2 kg object is spun around in a circle of radius 0.5m with a period of 5.0sA. what is the frequency of its rotationB. if the object's velocity is 0.63m/s, what is the acceleration?C. what is the... more
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Science Chemistry

03/19/21

Need help solving these two chem questions

1)In the laboratory, a general chemistry student measured the pH of a 0.482 M aqueous solution of hypochlorous acid to be 3.900.Use the information she obtained to determine the Ka for this... more
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Science Physics Algebra

03/18/21

What does this scale read?
Ronald Ripvance has a mass of 50kg. Ronald stands on the scale in an elevator traveling upward at a constant speed of 2.5 m/s. A. What does the scale below Ronald read? (in newton’s)B. The elevator... more
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03/18/21

Enthalpy diagram help
Frost forms on the windshield of a car on a cold winter morning. This frost disappears with no evidence that water forms. Draw an enthalpy diagram to illustrate the change. (If possible please... more
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03/18/21

physics question (answer is given but idk how to get to these answers)
A sled with two riders have a combined mass of 150.0 kg. They slide down a 12.0 m high hill and then across a frozen lake that is 60.0 m in diameter. The frictional force is a constant 200.0 N for... more
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03/18/21

physics question
How much work is done on a 2.50 kg box by carrying the box to the top of a set of stairs that is 12 meters in length and goes up 6 meters in elevation?
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Science Chemistry

03/17/21

5.000ml of 0.200M Fe(NO3)3 combined with 4.000ml of 0.00200M NaSCN in a 50.00ml volumetric flask filled with water. What is the diluted concentration for the SCN- ion, after the solution is made
5.000 ml of 0.200 M Fe(NO3)3 is combined with 4.000 ml of 0.00200M NaSCN in a 50.00 ml volumetric flask . The flask is then filled to the mark with water. What is the diluted concentration for the... more
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Science Chemistry

03/17/21

A 0.15 M solution of an unknown monoprotic acid has a pH of 4.1, calculate the Ka for this unknown acid.
I got 4.2e-8 for the answer I just don't think I solved it right.
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Science Chemistry

03/17/21

The kw for water is 5.5 x 10-14 at 50oC. What is the pH of a neutral aqueous solution at 50oC?
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03/17/21

Atmosphere questions
Describe what would cause the atmospheric pressure over an area to both increase and decrease.  What is the average “weight” of atmospheric pressure at sea level? What would happen to this... more
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03/16/21

Enthalpy diagram
Frost forms on the windshield of a car on a cold winter morning. This frost disappears with no evidence that water forms. Draw an enthalpy diagram to illustrate the change.
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03/15/21

Velocity v. Time Calculations
In order to calculate the total distance traveled (sometimes is the same as net displacement) from a velocity v. time graph, we find the total area under the line. Divide the area into triangles... more
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03/15/21

cell biology question
Propose how you would experimentally determine which X, Y, and Z yeast strains correspond with which UCC strains (names and genotypes given at the bottom end) if you had access to the... more
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03/15/21

Help with biology ITS URGENT PLEASE ??!!!!
Hemophilia is a sex linked trait. A woman who is a carrier for hemophilia marries a non-hemophilic man. -What is the chance that their male offspring will have the disease? -What is the chance that... more
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03/15/21

Help biology please ITS URGENT ???!!!
In rats, hair color is either gray (G), black (g), or white. The white color is produced due to an epistatic recessive allele of gene "a". In other words, in order for the black or gray color to... more
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Science Math Math Chemistry

03/15/21

How do I convert mmol/g to μmol/L?
Hello,How do I convert mmol/g to μmol/L?Specifically, 282±374.77 (Mean±SD) mmol/g to μmol/L?and 65±56.57 (Mean±SD) mmol/g to μmol/L?Many ThanksA.M.
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