a class is performing an experiment to keep an ice cube solid as long as possible. Which students actions could be a source of error in this experiment

A. Maria checked her ice cube every half hour and forgot to reseal the container she put the ice cube in

B. Jody used a different experimental design than Carlos used

C. Carey repeated the experiment with three different ice cubes

D. Jerrie measured the ice cube before it started to melt

Answers

Answer 1

Answer: the answer Is A. Maria checked her ice cube every half hour and forgot to reseal the container she put the ice cube in

Explanation: I just took the test

Answer 2

Answer:

A

Explanation:

APEX:)


Related Questions

What does hydrosphere and cryosphere both have in common?

Answers

Answer:

cryosphere is all those areas of earth where the surface is frozen while hydrosphere is all waters of earth, as distinguished from the land and the gasses of the atmosphere

Which of the following offers guidance to individuals in various situations of conflict, confusion and crisis by means of providing tools necessary for self-development?

Answers

Answer:

confusion

Explanation:

mark as brainlist plz

What are the two parts of an atom? the nucleus and the proton coud the neutron and the electron the neutron and the proton cloud the nucleus and the second 00​

Answers

Answer: The Nucleus and the Electrons are the 2 Parts of the atom.

Explanation:

An air bubble is at a depth of 3 m below
the surface of lake. What is the pressure
of water on the air bubble?
(take density of water = 1000 kgm )

Answers

Answer:

incorrect its 987 for exact

What is the velocity of a plane that took 2 hours to travel 1000 miles north?

A. 500 miles per hour North
B. 500 miles
C. 500 miles North
D. 500 miles per hour

Answers

D mid Univisionhdjfjfjfnfjzkakaozkdmxifjfifnfjcifjdnsnsn

The convection currents in the asthenosphere cause the movement of the

Answers

Convection currents generated within the asthenosphere push magma upward through volcanic vents and spreading centres to create new crust. Convection currents also stress the lithosphere above, and the cracking that often results manifests as earthquakes.

How do you find the surface area of a rectangular object?

Answers

Answer:

A=2(wl+hl+hw)

Explanation:

Hope this helps! :)

What layer of atmosphere does planes fly?

Answers

Answer: stratosphere

The stratosphere is the second to last layer of atmosphere to the Earth. It is about 40,000 feet above, and this is the range where planes fly. So, the answer is stratosphere.

Hope this helps!

Answer:

stratosphere

Explanation:

Planes fly in the stratosphere of the atmosphere.

The answer to the question is stratosphere.

Okay? Thank you so much for 25 points.

An object that has 0 acceleration will never be in motion

Answers

Answer:

False

Explanation:

If a rock is skipped into a lake at 24 m/s2 with what force as the rock
thrown if it was '1,75 kg?

Answers

Answer:

Force = Mass * Acceleration

Explanation:

24*1.74= 42 N

When your blood pressure is low, choose a choice below that explains what occurs.
A. The nervous system signals smooth muscles in the blood vessels to relax to decrease blood pressure.
B. The nervous signals smooth muscles in the blood vessels to relax to increase blood pressure.
C. The nervous system signals smooth muscles to contract to decrease blood pressure.
D. The nervous system signals smooth muscles in the blood vessels to contract to increase blood pressure

Answers

Answer:

The correct option is;

D. The nervous system signals smooth muscles in the blood vessels to contract to increase blood pressure

Explanation:

The contraction or relaxation of the vascular smooth muscles lead to the blood vessel volume change and blood pressure change such that the blood is redirected to regions of the body that requires instantaneous increased oxygen intake. As such the nervous system signals the blood vessel's vascular smooth muscle to contract, through vasoconstriction so as to raise the blood pressure, when the blood pressure is low.

Can someone help me please, thanks.

Answers

Answer:

rotation

Explanation:

Im pretty sure. Please heart and mark brainliest

Answer:

cycle

Explanation:

either rotation or cycle. I would think.

If an object has two forces acting on it, how can the net force equal 0?

Answers

Answer:

Check explanation.

Explanation:

Net force is essentially the sum of the forces enacting upon an object. One example of net force is gravity and normal force. It is commonly accepted that every object has a force acting upon it, even if it is stationary. To give an example, the weight of an object has a force upon the earth but the earth pushes back, essentially meaning that the object will not sink.

Which answer explains why plate B is moving underneath plate A


A. Plate B is more dense than plate A because it is composed of oceanic crust


B. Plate A is more dense than plate B because it is composed of oceanic crust


C. plate B is more dense than plate A because it is composed of continental crust


D. Plate A is more dense than plate B because it is composed of continental crust

Answers

Answer:

A.

Explanation:

Earth is composed of different layers and one layer moves over another due to differences in the densities.

According to the physics of density, a substance having less density floats over a higher density substance. The oceanic crust has more density than the continental crust that is why continental crust float over oceanic crust.

So in the given example, plate B is moving below the plate A, it means plate B is more dense than plate A because plate B is composed of oceanic crust . For example : continents float over the asthenosphere (a layer below the lithosphere).

Hence, the correct answer is "A ".

Mr. Chang's class participated in a science experiment where they placed three substances outside in the sunlight to determine which substance would increase in temperature more quickly. How would the motion of the particles of each substance be described if they are allowed to sit in the Sun for a duration of 10 minutes?

Choices:

The particles do not change in motion because the substances are undisturbed.


The particles of each substance begin to speed up and move farther apart as the temperature increases.


The particles of each substance begin to slow down and move closer together as the temperature increases.


The particles of each substance speed up and slow down simultaneously, but remain in a fixed position as the temperature increases

Answers

Answer:

B or D but im pretty sure it is D

Explanation:

When molecules are left in the sun, it heats up. When molecules heat up, the begin to vibrate rapidly. The sun is not constant as it could get blocked by clouds, so it would, at times, slow down the movement of the molecules. The answer is most likely D.

Which unit you would use to measure the following objects? This is so confusing

Answers

Answer:

weight of truck in kg, height of person in meter m, amount of water in kiloliter kl, length of eyelash in mm

A ball is thrown horizontally from a 11 m high building with a speed of 9.0 m/s.

How far from the base of the building does the ball hit the ground?
Express the answer using two significant figures.

Answers

Answer:

the answer to you're question is d=9

A gust of wind blows an apple from a tree. As the apple falls, the force of gravity on the apple is 9.11 N downward, and the force of the wind on the apple is 1.18 N to the right. What is the magnitude of the net external force on the apple? Answer in units of N. Part 2: What is the direction of the net external force on the apple (measured from the downward vertical, so that the angle to the right of downward is positive)? Answer in units of ◦

Answers

Answer:

The net external force on the apple is 9.18 N and the direction of net force is 82.6°.

Explanation:

Given that,

Force of gravity = 9.11 N

Force of wind = 1.18 N

We need to calculate the net external force on the apple

Using formula of net force

[tex]F'=\sqrt{(9.11)^2+(1.18)^2+2\times1.18\times9.11\cos90}[/tex]

[tex]F'=9.18\ N[/tex]

We need to calculate the direction of net force

Using formula of direction

[tex]\theta=\tan^{-1}(\dfrac{9.11}{1.18})[/tex]

[tex]\theta=82.6^{\circ}[/tex]

Hence, The net external force on the apple is 9.18 N and the direction of net force is 82.6°.

The magnitude of the net external force on the apple is 9.19 N and the direction of the net external force is 82.6⁰.

The given parameters;

weight of the apple, W = 9.11 Nhorizontal force on the apple, F = 1.18 N

The magnitude of the net external force on the apple is calculated as follows;

[tex]F= \sqrt{F_y^2 + F_x^2} \\\\F= \sqrt{9.11^2 + 1.18^2} \\\\F = 9.19 \ N[/tex]

The direction of the net external force on the apple is calculated as follows;

[tex]\theta = tan^{-1}(\frac{F_y}{F_x} )\\\\\theta = tan^{-1}(\frac{9.11}{1.18} )\\\\\theta = 82.6 \ ^0[/tex]

Thus, the magnitude of the net external force on the apple is 9.19 N and the direction of the net external force is 82.6⁰.

Learn more here:https://brainly.com/question/816252

PHYSICS HELP PLEASE ONE QUESTION 10 POINTS:)

Answers

Case 1 has the greatest strength for the push and pull. Option A is correct.

What is force?

The pushes and pulls the body experiences are referred to as force. It can occasionally be used to alter the body's size, shape, and direction.

Mass times acceleration equals force, according to the definition. Newton is its measure.

The force transmitted through a rope, string, or wire as it is tugged by opposing forces is referred to as the tension force.

Energy is drawn equally from both ends by the tension force, which is exerted along the whole length of the wire.

The tension force is acting in the rope causing greater strength for the push and pull.

Hence, option A ia correct.

To learn more about the force refer to the link;

https://brainly.com/question/26115859

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how long would it take for a car to travel 200 km if it has an average speed of 55 km/hr?​

Answers

Answer:

3.6

Explanation:

Answer:

3.64 hrs

Explanation:

If you force the magnitude of the vector to stay the same, but increase the vertical component value, what happens to the horizontal component of the vector?

Answers

Answer:

The horizontal component reduces

Explanation:

The magnitude of a vector is found by taking the root of the sum of the squares of the components of the vector

Therefore, when the values of one of the components is increased, while the other components of the vector stay the same, the magnitude of the vector increases

In order  to increase the value of one of the components of a vector and maintain the magnitude of the vector, the values of one or more of the other components must be reduced.

As such when the magnitude of the vector that has only a vertical and a horizontal component is forced to stay the same, and the vertical component is increased, the horizontal component must be reduced.

The increase in vertical component of the vector, causes a decrease in the horizontal component of the vector.

A vector can be represented in vertical and horizontal components.

[tex]V = V_x + V_y[/tex]

where;

[tex]V_x[/tex] is the horizontal component of the vector[tex]V_y[/tex] is the vertical component of the vector

[tex]V = Vsin(\theta) \ + Vcos(90-\theta)[/tex]

From the formula above, as one component vector increases, the other component reduces.

Thus, the increase in vertical component of the vector, causes a decrease in the horizontal component of the vector.

Learn more here:https://brainly.com/question/16491056

The boundary between areas of high and low pressure:
A Front
B Barometer
C Weather
D Air pressure

Answers

The answer is A, Front is a weather system that separates it.

Which items are needed for a plant to become fertilized?

egg

pollen

embryo

seed

Answers

The answer is pollen.

Fertilization in flowering plants happens through a process called pollination.
Pollen of course or it could be seed

Which action describes the first step in both scientific investigation and technological design?

researching how solar panels work
identifying a need for a solar panel
communicating to the team that solar panels are easy to install
designing a solution by sketching a prototype for a solar panel

Answers

Answer:

The best answer would be D

Explanation:

This would be best because if you sketch about an object or thing you are making it can help you better picture what you are making or someone else therefore the answer is D

Answer:

Answer is D fs

Explanation:

*designing a solution by sketching a prototype for a solar panel*

The part of a flower which holds the egg cells is the:

ovary

style

stamen

anther

Answers

Answer:

Maybe pistil or ovary

pistil usually is located in the center of the flower and is made up of three parts: the stigma, style, and ovary

Answer:

A. Ovary

Explanation:

HEY CAN ANYONE PLS ANSWER DIS!!!!!!!

Answers

Answer:

A. Filtration

Explanation:

Chromatography can not be used to seperate A(l) from the mixture. And you can not even perform the method since B(s) is present.

As for distillation, this process is used to seperate liquid from mixture of liquids. Filtration is effective in seperation of liquid and solid.

What collides and creates a movement of heat called conduction?

A. photons

B. compounds

C. Molecules

D. atoms

Answers

Answer:

c.

Explanation:

Molecules collide and create a movement of heat called conduction.

What is conduction?

Conduction is defined as a process  as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to  a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules  while in liquids and gases it is due to the random motion of the molecules ,

When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state  conduction 2) transient conduction.According to the type of energy conduction is of three types:

1) heat conduction

2) electrical conduction

3)sound conduction

Learn more about conduction,here:

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what are 3 sources of heat inside earth?

Answers

1. Heat from when Earth was formed.

2. Frictional Heat, which is caused by heavier core material sinking to the center of the Earth.

3. Heat from the decay of elements that are radioactive.

a spring balance used to weigh candy is built with a spring the spring stretches 3.00 cm when a 15 n weight is placed in the pan. when the weight is replaced with 3 kg of candy, what distance will the spring stretch?
a.7.0 b.4.5 c.3.8 d.5.9

Answers

Answer: 5.9cm

Explanation:

15N/3cm=5

Convert 3kg to N (29.42N)

Use the 5 from earlier to divide 29.42/5=5.884

Round to 5.9

5.9cm is the answer

(I don’t know if I solved this the correct way but I got it right. 5.9 is the correct answer)

all known frequencies of the visible spectrum are..

a. solar light
b. light
c. black light

Answers

Explanation:

[tex]b. \: light[/tex]

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