4,347 Answered Questions for the topic Science

Science Biology

08/17/20

what is the independent variable?
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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... more
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Science Math Physics

08/14/20

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... more
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Science

08/13/20

what is a negatively charged ion called
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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... more
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Science Physics Mechanics

08/09/20

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... more
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Science Physics Mechanics

08/09/20

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.... more
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Science Physics Mechanics

08/09/20

Moment of inertia
Show that the moment of intertia of a solid sphere is I=(2/5)mr^2m - massr - radiusDoes here exist a non-integral solution?
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Science Physics Mechanics

08/09/20

Inclined plane physics problem
A sphere with mass m is put on top of an inclined plane with height h. In the first case the sphere is moving downwards without friction, and in the second case with very little friction. Find the... more
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Science Chemistry

08/08/20

How do you measure hydrogen gas in an experiment?

Because hydrogen gas is insoluble in water, is that why we can measure the volume of hydrogen gas (i.e. with a gas syringe, gas jar, etc)? Also, in an experiment when hydrogen gas is produced, does... more
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08/08/20

Why is black called the absence of color when the absence of color is "colorless/transparent" like plain water and other clear colorless liquids?
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Science Math Chemistry

08/05/20

How do I become a tutor?
I am interested in using my knowledge as a tutor for local students. I am a degreed engineer, and I am now retired. I have tutored friends in the past, and now I am interested in doing the same... more
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Science

07/30/20

The circuit in a particular walkie talkie has a total resistance of 450 ohms and the battery is supplying 9 V how much current in amps (a) is flowing?
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Science Physics

07/28/20

Under which conditions would a nucleus be least likely to undergo radioactive decay?
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Science

07/27/20

A runner drinks a protein shake, then runs a race. What kind of energy conversion is taking place?
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07/17/20

computer sciiii
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Science

07/17/20

PLEASE HELP! Homework Help!
Jessica and Taylor are playing in a seesaw. Taylor is suspended in the air and is unable to move her seat down. Explain why Taylor cannot swing back down.The force pushing down is less than the... more
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07/15/20

Which of the following characteristics apply to PH3? 1) trigonal pyramidal molecular geometry 2) sp2 hybridized 3) polar bonds 4) nonpolar molecule
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07/15/20

In which of the following molecules does the carbon atom have sp hybridization: HCN, CH4, CO2, and CH2O?
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07/13/20

The angle θA = 35° above the x axis, and the angle θB = 59° below the x axis. 1)What is the magnitude of the car’s acceleration?
A car is traveling around a horizontal circular track with radius r = 230 m as shown. It takes the car t = 52 s to go around the track once. The angle θA = 35° above the x axis, and the angle θB =... more
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Science Trigonometry

07/13/20

A car is traveling around a horizontal circular track with radius r = 230

A car is traveling around a horizontal circular track with radius r = 230 m at a constant speed v = 17 m/s as shown. The angle θA = 39° above the x axis, and the angle θB = 56° below the x... more
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Science Trigonometry

07/13/20

A child is in danger of drowning in the Merimac river. The Merimac river has a current of 3.1 km/hr to the east. The child is 0.6 km from the shore and 2.5 km upstream from the dock.
A child is in danger of drowning in the Merimac river. The Merimac river has a current of 3.1 km/hr to the east. The child is 0.6 km from the shore and 2.5 km upstream from the dock. A rescue boat... more
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