4,374 Answered Questions for the topic Science

Science Chemistry Gcse

06/09/20

Magnesium burns in air to give magnesium oxide as shown below. If 8g of magnesium oxide product is produced, calculate how much magnesium metal must have been used.

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Science Chemistry Gcse

06/09/20

The equation below shows the formation of ammonia. If 56g of nitrogen gas is used in the reaction, how much ammonia will be formed?
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Science Calculus

06/09/20

What tells you that the relation is best fit by a linear model? Use principles about what kinds of functions have consistency in which types of rates of change?
Suppose a set of data about the spread (in hundreds of acres) of a food-borne bacteria (after t weeks) in lettuce has the following percentage rates of change: 0.9%, 1.3%, 1.1%, 1.0%, 1.3%, 1.0%;... more
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Science Physics

06/08/20

Neglecting the effects of air resistance, how far will an object fall from rest in 9 seconds? Please show your work in order to earn credit for this question.
Neglecting the effects of air resistance, how far will an object fall from rest in 9 seconds? Please show your work in order to earn credit for this question.Free Fall Kinematic Equations which may... more
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Science Physics

06/08/20

What is the acceleration of the block?
A 9 kg block experiences two external forces acting on it simultaneously. Force A has a magnitude of 20 N and points in the positive direction. Force B has a magnitude of 4 N and points in the... more
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Science Chemistry

06/08/20

Chemistry question
When a gas enters an opened container and reacts with the substances in the container, is it part of the initial measurement of the reactants on the scale? Does the total mass change during a... more
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Science Physics

06/08/20

If a 23 N horizontal force is acting on a box and the box remains at rest, then the force of static friction must be ___________.

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Science Physics

06/08/20

Driving down the highway you see a truck that has a mass of 3250 kg. If you are told the force of friction is 1500 N, what is the coefficient of friction? What is the acceleration of the truck?
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Science Physics

06/08/20

4 N horizontal force is needed to keep an object that weighs 128 N moving at a constant speed.

A 4 N horizontal force is needed to keep an object that weighs 128 N moving at a constant speed. What is the coefficient of kinetic friction between the object and the surface? Do not include the... more
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Science

06/08/20

If A light bulb has a power rating of 100 watts How much does it transfer in one minute

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Science Physics

06/08/20

Driving down the highway you see a truck that has a mass of 3250 kg.
Driving down the highway you see a truck that has a mass of 3250 kg. If you are told the force of friction is 1500 N, what is the coefficient of friction? What is the acceleration of the truck?
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Science Chemistry

06/08/20

What are all the ways that a substance can change phase?
What are all the ways that a substance can change phase? *Any substance in general, not a specific one. Thank you! :)
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06/08/20

how to find fluid displacement and buoyancy?
The liquid Density is 2.4kg/L The object weight is 20.Kg and its density is 4.6kg/LHow do i solve the buoyant force and its new weight while in the liquid?
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06/08/20

Anatomy & Physiology (MRNA & DNA)

Which nitrogenous bases would be found on the MRNA transcribed from a DNA strand with the following nucleotide sequence: AAA/TTT/GGG/CCC and why?
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06/08/20

Anatomy and Physiology (DNA)
One DNA strand of Chromosome #12 has the following nucleotide sequence: TAC/CGC/CCT/TGC/GTA/CTC/ACT.What nitrogenous bases would be found on "the other DNA strand lying along side of it and why?"
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Science Chemistry

06/08/20

Adding energy to a substance can cause..?
Adding energy to a substance can cause..?*There is three answers to this that I need to include in my notes.Thank you so much! :)
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Science Physics

06/06/20

A rectangular boat is 13 m wide and 14 m long
A rectangular boat is 13 m wide and 14 m long. After a truck pulls onto the ferry, the boat ends up with a depth of 6 cm submerged under the water. If the weight of the ferry is 10,000 N, what is... more
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Science Physics

06/06/20

A rectangular boat is 9 m wide and 6 m long.

After a truck pulls onto the ferry, the boat ends up with a depth of 9 cm submerged under the water. What is the combined weight of the truck and the ferry? (Assume the density of water is 1000... more
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Science Physics Sat

06/06/20

A cube is placed in a pool of water. If the cube is 12 cm long on each side, what is the weight of the cube? (Use 1000 kg/m3 for the density of water)
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06/05/20

Are radio waves and sound the same?
So the electromagnetic spectrum: radio waves, micro waves, infrared rays, visible light, ultra violet rays, x rays, gamma rays, cosmic rays. Now visible range is 390 to 700 nanometers, beyond 700... more
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Science Physics

06/03/20

For a submarine to stay submerged, it must be neutrally buoyant, which means it is maintaining a careful balance between its weight and the buoyant force of water pushing it toward the surface.
For a submarine to stay submerged, it must be neutrally buoyant, which means it is maintaining a careful balance between its weight and the buoyant force of water pushing it toward the surface. If... more
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Science Chemistry

06/01/20

I need help with chemistry

I need help with knowing what is the product of baking soda and vinegar. What products can possibly form when methane gas reacts with oxygen gas from the air. Is methane gas and oxygen gas a... more
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Science Physics

06/01/20

Physics Question, What formula would be used?
Why can a batter hit a pitched baseball further than a ball tossed in the air by the batter? P=mv?
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05/31/20

Please give me a short explanation
Most police agencies' effectiveness are measured by how much crime is reported to the UCR. Briefly explain what the UCR data consists of. Then explain what the strengths and weaknesses of this... more
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Science

05/31/20

PLEASE EXPLAIN HOW TO USE THE PUNNET SQUARE!
The following Punnett Square shows a cross between two hybrid flowers. If the flowers show incomplete dominance, what fraction are pure red?1/4 1/2 3/4 0
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