4,374 Answered Questions for the topic Science
sam is an astronomer
Sam is an astronomer on planet Hua, which orbits the distant star Barnard. It has recently been accepted that Hua is spherical in shape, although its exact size is unknown. While studying in the...
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Suppose the Moon is 383 thousand km from Earth, and its orbital period is 27.2 days. What is the Moon's speed in km/hr for this orbit?
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kinetic energy of moving object
The kinetic energy of a moving object is KE = 1/2 mv2, where m is the mass and v is the speed. An average apple has a mass of 0.19 kg. How fast must the apple travel in m/s to have kinetic energy...
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Science Biology
08/28/20
Describe vitalism. Describe what scientists now think about the basis of life and why they rejected the theory of vitalism.
The theory of vitalism has been rejected by present-day scientists. Describe vitalism. Describe what scientists now think about the basis of life and why they rejected the theory of vitalism.
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A typical human cell is approximately 10 μm in diameter and enclosed by a membrane that is 4.4 nm thick. To simplify the calculations, model the cell as a sphere.
1.What is the volume of the cell? I got this= 524.49, it is correct2.What is the volume of the cell membrane? 3.What percent of the cell volume does its membrane occupy? I need help on the last two...
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i need help cause of A commercial jet liner hits an air pocket and drops feet. After climbing feet, it drops another feet. What is its overall vertical change?
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Science 6th Grade
08/23/20
Earth's place in the universe. Moon phases ( Lunar Cycles )
Question: Why does the moon have phases?The ___ of the ____ around the _______ causes the _______ to appear to have _____. My question is: What goes in the blanks to complete the sentence?
Science Biology
08/21/20
Science Question, need an answer asap.
What's the simplest virus? Briefly describe it.
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Science Mathematics
08/21/20
Science and Mathematics
it takes 30 days to fill a laboratory dish with bacteria. if the size of the bacteria doubles each day, how long did it take for the bacteria to fill one half of the dish
08/20/20
Engineering Project Planning Insight
Hello to anyone reading this!I am currently working on a project involving the analysis of real world systems for my engineering mechanics class. The systems that I have chosen would involve...
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08/19/20
Explain each of the following ; frontal plane, tranverse plane, sagittal plane, coronal plane, anterior, posterior, superior, inferior, dorsal, ventral, distal and proximal
These are medical terms refering to where something may be on a body.
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Science Chemistry
08/19/20
How are elements related to the particle theory of matter?
Humidity and vapor pressure question
How much does the mole fraction of O2 in the atmosphere change at 20℃ as the relative humidity varies from 100% to 0%?. In dry air, the mole fraction of O2 is known to be 0.2095.
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Science Psychology
08/18/20
What are the steps of the scientific approach to research? Explain the relationship between the independent variable and the dependent variable in an experiment.
What are the steps of the scientific approach to research? Explain the relationship between the independent variable and the dependent variable in an experiment.
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Science Biology
08/17/20
One of the ways a substance move in and out of a cell is called
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Science Biology
08/17/20
What is the difference between the independent variable, dependent variable, experimental group, control group, constants
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Science English
08/15/20
the tragedy of the commons
Hardin stated, “[The] commons, if justifiable at all, is justifiable only under conditions of low-population density. As the human population has increased, the commons has had to be abandoned in...
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Dimensional Analysis
Consider Stoke´s problem: a small sphere falling under gravity in a viscous fluid. The sphere´s velocity v is assumed to depend on the sphere's radius r, the gravity acceleration g, the dynamic...
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Science
08/13/20
An atom has an atomic number of 20. Its electron configuration would be:
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Science
08/11/20
How to find the velocity of a moving object
It has a body of mass 80kg and kinetic energy if 4000J
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08/11/20
Very hard hanging rod problem
A straight rod of 30 cm and 600 g mass is horizontally hanged on two upright, parallel and light threads, both of them attached with distances of 5 cm and 10 cm from its ends. Find tension forces...
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Spring problem .
Initial lenght of a spring is l. After hanging up a load with mass m on its end, the spring stretched doubly. Where should you hang up a load of mass 2m on now stretched spring so that after...
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Torque question
A disk of mass 6 kg and radius 25 cm is rotating around horizontal axis that goes through its center with n=360 revolutions/min. When the disk was being stopped it stopped right after t=30 s....
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