4,374 Answered Questions for the topic Science

Science Physics

03/24/21

Two forces, of magnitudes F1 = 95.0 N and F2 = 40.0 N , act in opposite directions on a block, which sits atop a frictionless surface
Initially, the center of the block is at position  = -6.00  . At some later time, the block has moved to the right, and its center is at a new position,  = 6.00  .Find the work done on the block by... more
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Science Physics

03/24/21

You pick up a 3.4 kg can of paint from the ground and lift it to a height of 1.5 m .
A) How much work do you do on the can of paint?B)You hold the can stationary for half a minute, waiting for a friend on a ladder to take it. How much work do you do during this time?Express your... more
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Science Physics

03/24/21

A child in a tree house uses a rope attached to a basket to lift a 24 N dog upward through a distance of 5.0 m into the house.
How much work does the child do in lifting the dog?Express your answer to two significant figures and include the appropriate units.
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03/23/21

Summarize the events of contraction that lead up to sarcomere shortening including discussion of cross-bridge formation and the sliding filament model.
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03/23/21

Help with biology its urgent
Cystic fibrosis is a disease which is caused by a defective CFTR gene. This form of the gene is recessive. Let "N"=normal CFTR gene and "n" = abnormal CFTR gene. What is the genotype of individual... more
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Science Math Physics

03/23/21

Can anyone show how to solve this physics problem?
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03/22/21

PHYSICS HELP! Force of Gravitational Attraction
Determine the force of gravitational attraction between the earth ( which is 5.98 x 10^24 kg ) and a 70 kg physics student if the student is standing at sea level, a distance of 6.40 x 10^6 meters... more
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03/22/21

I need some help, I can't solve this physics problem.
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03/22/21

I need some help, I can't solve this physics problem.
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03/22/21

I need some help, I can't solve this physics problem.
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03/22/21

Describe the three sources of energy to produce ATP for muscles and distinguish between aerobic and anaerobic processes.
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03/21/21

Explain how muscle use leads to hypertrophy or atrophy through changes in muscle fiber mass
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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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