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Home Q & A Board Science-Related Homework Help High School Level Science
Ask your high school biology, chemistry, and physics questions here.
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Noah and Luke lifted the canoe up from the riverbank, carried it across the yard, and placed it on ...
Noah and Luke lifted the canoe up from the riverbank, carried it across the yard, and placed it on ...
[html]Noah and Luke lifted the canoe up from the riverbank, carried it across the yard, and placed it on the top rack.When are the boys doing work on the canoe?

Work = Force x Distance

 

canoe_racks_61ef3eb435092.jpg

 a
They are not doi
kiddbrit   132   1 Reply
A year ago
What is the name for the point on which a lever rests?
What is the name for the point on which a lever rests?
What is the name for the point on which a lever rests?
pica   95   1 Reply
A year ago
How much work does Juanita do if she uses a force of 40 newtons to pull 2 friends on a wagon for 32 meters?
How much work does Juanita do if she uses a force of 40 newtons to pull 2 friends on a wagon for 32 meters?
How much work does Juanita do if she uses a force of 40 newtons to pull 2 friends on a wagon for 32 meters?
Ltothe2nd   93   1 Reply
A year ago
Work is:
Work is:
Work is:a
energy from the Sun
 b
a type of machine
 c
a force that pulls you towards the Earth
 d
a force that moves an object
scarri04   84   1 Reply
A year ago
The girl in the picture applies 10 N of force to the snowball to move it 2 meters. How much work ...
The girl in the picture applies 10 N of force to the snowball to move it 2 meters. How much work ...
[html]The girl in the picture applies 10 N of force to the snowball to move it 2 meters.  How much work has she done?person-rolling-big-snowball-concept-winter-fun-person-rolling-big-snowball-concept-winter-fu_61ef29cc4e32a.jpg

 a
5 J
 b
1
le_onyx   76   1 Reply
A year ago
Put the cars in order of achieving the greatest efficiency. Order them, the greatest efficiency at ...
Put the cars in order of achieving the greatest efficiency. Order them, the greatest efficiency at ...
[html]Put the cars in order of achieving the greatest efficiency. Order them, the greatest efficiency at the top to the least efficiency at the bottom.Efficiency = Output/Input

Reorder answers
1.A Green car that traveled 90 kilometers on 6
Cozman34   85   1 Reply
A year ago
Tito and Michael put 1200 joules of work into pushing a box up a ramp, but only 300 joules of work ...
Tito and Michael put 1200 joules of work into pushing a box up a ramp, but only 300 joules of work ...
Tito and Michael put 1200 joules of work into pushing a box up a ramp, but only 300 joules of work is output for moving the box. What is the efficiency of the ramp?
gcollins97   72   1 Reply
A year ago
How does using a ramp make work easier when loading a couch onto a truck three feet above the ground?
How does using a ramp make work easier when loading a couch onto a truck three feet above the ground?
[html]How does using a ramp make work easier when loading a couch onto a truck three feet above the ground?a
It allows a smaller force to be applied over a longer distance.
 b
It allows a smaller force to be applied over a shorter distance.
13charchap13   69   1 Reply
A year ago
It took Meghan 50 Joules to carry her shopping bags 5 meters to the car. How much force did she use?
It took Meghan 50 Joules to carry her shopping bags 5 meters to the car. How much force did she use?
It took Meghan 50 Joules to carry her shopping bags 5 meters to the car. How much force did she use?Work = Force x Distance

 a
250 Newtons
 b
10 meter
 c
10 Newtons
 d
55 Joules
illeztg   49   1 Reply
A year ago
LaToya uses 50 newtons (N) of force to pull a 500 N cart. Which statements are correct about ...
LaToya uses 50 newtons (N) of force to pull a 500 N cart. Which statements are correct about ...
[html]LaToya uses 50 newtons (N) of force to pull a 500 N cart. Which statements are correct about calculating LaToya's mechanical advantage? Select the two that apply.a
The mechanical advantage is 100.
 b
The output force is 50 N.
 c
The i
jasminejoseph92   125   1 Reply
A year ago
Why does air in a room rise when it gains thermal energy from a heater? (1 point)
Why does air in a room rise when it gains thermal energy from a heater? (1 point)
[html]Why does air in a room rise when it gains thermal energy from a heater? (1 point)Responses

Its molecules move around more quickly, so there is more space between them, making it less dense than the air above it.
Its molecules move ar
ma96   145   1 Reply
A year ago
Chem 30-hw help-urgent please
Chem 30-hw help-urgent please
3. Aqueous iron (III) nitrate and aqueous tin (II) bromide are mixed.

a) List all the species present and identify the SOA and SRA
                 




b) Write the oxi
Anonymous   110   2 Replies
Anonymous
A year ago
What is the relationship between kinetic energy and thermal energy?(1 point)
What is the relationship between kinetic energy and thermal energy?(1 point)
[html]What is the relationship between kinetic energy and thermal energy?(1 point)Responses

As the kinetic energy in a substance’s atoms increases, its thermal energy increases, and vice versa.
Kinetic energy is the transfer of thermal ene
basehead48   91   1 Reply
A year ago
Anything that causes a reaction or change in an organism is called a stimulus while an organism's ...
Anything that causes a reaction or change in an organism is called a stimulus while an organism's ...
Anything that causes a reaction or change in an organism is called a stimulus while an organism's reaction to the stimulus is called a response.True

False
Kristian11x   58   2 Replies
A year ago
All of the following are examples of external stimuli EXCEPT...
All of the following are examples of external stimuli EXCEPT...
All of the following are examples of external stimuli EXCEPT...Group of answer choices

A.Light

B.Hormones

C.Temperature

D.Water
choge25   88   2 Replies
A year ago
Why do bears hibernate during the winter months?
Why do bears hibernate during the winter months?
[html]Why do bears hibernate during the winter months?Group of answer choices

A.Bears bypass winter to protect themselves from roaming predators.

B.Bears bypass winter when their food supply disappears to save energy.

C.Bears bypass wint
raym20on   52   1 Reply
A year ago
Which two examples undergo dormancy?
Which two examples undergo dormancy?
Which two examples undergo dormancy?Group of answer choices

A.Black Bear

B.Squirrel

C.Human

D.Rose Bush

E.Oak Tree

F.Mouse
rossrams4   61   2 Replies
A year ago
Why is phototropism important?
Why is phototropism important?
Why is phototropism important?
illeztg   47   1 Reply
A year ago
Using graphic organizers timeline which graphic organizer best represents changes over a period of time?
Using graphic organizers timeline which graphic organizer best represents changes over a period of time?
Using graphic organizers timeline which graphic organizer best represents changes over a period of time?
alanz33   97   1 Reply
A year ago
Machine Output Work (J) Input Work (J)
Machine Output Work (J) Input Work (J)
[html]Machine Output Work (J) Input Work (J)A               750                     1,500
B             1,000                     4,000
C              450                       600
D             3,000                     5,000
Which machine
treebushafro   55   1 Reply
A year ago
How does a pulley make work easier when it is used to lift an object?
How does a pulley make work easier when it is used to lift an object?
[html]How does a pulley make work easier when it is used to lift an object?A.) It reduces the weight of the object being lifted.

B.) It decreases the distance over which the force must be applied to lift the object.

C.) It changes the dir
caitiesweeney   52   1 Reply
A year ago
A certain lever system is only 30% efficient. What could make it more efficient?
A certain lever system is only 30% efficient. What could make it more efficient?
[html]A certain lever system is only 30% efficient. What could make it more efficient?A.) Make a longer lever that will require less force.

B.) Use a stiffer lever to reduce energy lost bending the lever.

C.) Have more than one person he
segandhi   49   1 Reply
A year ago
A certain lever system is only 30% efficient. What could make it more efficient? Choose one answer.
A certain lever system is only 30% efficient. What could make it more efficient? Choose one answer.
[html]A certain lever system is only 30% efficient. What could make it more efficient? Choose one answer.A.) Make a longer lever that will require less force.

B.) Use a stiffer lever to reduce energy lost bending the lever.

C.) Have more
ivanjrrivera   71   1 Reply
A year ago
What is the efficiency of a ramp if 2,000 joules of energy results in 1,200 joules of work?
What is the efficiency of a ramp if 2,000 joules of energy results in 1,200 joules of work?
What is the efficiency of a ramp if 2,000 joules of energy results in 1,200 joules of work?A.) 80%

B.) 32%

C.) 60%

D.) 24%
aries1573   409   1 Reply
A year ago
What is a newton?(1 point)
What is a newton?(1 point)
What is a newton?(1 point)Responses

the unit in which force is measured

a non-contact force

a force that pulls objects toward the ground

a force that changes the motion of an object
Kristian11x   56   1 Reply
A year ago
Look up the equation for photosynthesis. Pretend you are the element oxygen. What is happening to ..
Look up the equation for photosynthesis. Pretend you are the element oxygen. What is happening to ..
Look up the equation for photosynthesis. Pretend you are the element oxygen. What is happening to you as you are going through this change from one side of the equation to the other side?
bt28   119   1 Reply
Anonymous
A year ago
explain the differences between a chemical and physical change.
explain the differences between a chemical and physical change.
explain the differences between a chemical and physical change.
castled4   58   1 Reply
A year ago
what are two examples of a physical change other than in the reading?
what are two examples of a physical change other than in the reading?
what are two examples of a physical change other than in the reading?
tigger75   53   1 Reply
A year ago
Using the types of chemical changes in the bulleted list at the bottom of the page, what are two ...
Using the types of chemical changes in the bulleted list at the bottom of the page, what are two ...
Using the types of chemical changes in the bulleted list at the bottom of the page, what are two specific examples of chemical change besides burning a substance?
Bingobaby123   60   1 Reply
A year ago
Which types of Barry onyx matter are most abundant in the universe select the two correct answers
Which types of Barry onyx matter are most abundant in the universe select the two correct answers
Which types of Barry onyx matter are most abundant in the universe select the two correct answers
caitiesweeney   80   1 Reply
A year ago
Mid-Digital Hair and Freckles punnett square
Mid-Digital Hair and Freckles punnett square
#11.Mid-Digital Hair and Freckles
Finger mid-digital hair (M) is dominant over the recessive trait of no mid-digital hair (m). Freckles (F) is dominant over the recessive trait of no freckles (f). (It is important to note that this example of mi
Aliya1   183   3 Replies
Anonymous
A year ago
Population growth and interaction questions 15&16
Population growth and interaction questions 15&16
#15.Once an abundant species in Alberta, the caribou population is currently staggering at approximately 6,700 individuals.
Little Smoky caribou herd is located in Northern Alberta, and its population is a risk of extirpation. In 1970, there wer
 12
Aliya1   1377   21 Replies
Anonymous
A year ago
What is the growth rate of the E. coli population?
What is the growth rate of the E. coli population?
A sample of raw ground beef initially contained 57 E. Coli bacteria. After six hours, there are 125,456 cells in the sample.



What is the growth rate of the E. coli population?



Express your answer using
Connie T   646   6 Replies
Anonymous
A year ago
The ________ is a thin, solid layer of the Earth made of many elements. There are two types, ...
The ________ is a thin, solid layer of the Earth made of many elements. There are two types, ...
The ________ is a thin, solid layer of the Earth made of many elements. There are two types, continental and oceanic.inner core
outer core
crust
mantle
snowdon293   95   1 Reply
A year ago
A small, rocky object that orbits the Sun (mostly between Mars and Jupiter).
A small, rocky object that orbits the Sun (mostly between Mars and Jupiter).
. A small, rocky object that orbits the Sun (mostly between Mars and Jupiter).*
2 points
comet
meteorite
meteor
asteroid
tibrbk   104   1 Reply
A year ago
An astronomical unit is an average distance between the Sun and ___________.
An astronomical unit is an average distance between the Sun and ___________.
An astronomical unit is an average distance between the Sun and ___________.*
2 points
Earth
Mars
Neptune
Venus
emfsys   85   1 Reply
A year ago
Examining age pyramids
Examining age pyramids
4) examine the age pyramids shown below
A) describe the shape of the age pyramid for each country
B) for each country, which would be greater- the birth rate or the death rate? Explain each answer
C) explain how the age structure of e
angie19   2035   4 Replies
Anonymous
A year ago
I need help on the Age of Earth Unit Test, Unit 7, Lesson 8. I'm going to put my answers below, ...
I need help on the Age of Earth Unit Test, Unit 7, Lesson 8. I'm going to put my answers below, ...
[html]I need help on the Age of Earth Unit Test, Unit 7, Lesson 8. I'm going to put my answers below, could someone help me check them?1. The fossil is older than the layer of rock it was formed in
2. The fault is younger than the layers of
NurseDeziel   125   1 Reply
A year ago
The Age of Earth Unit Test, Unit 7, Lesson 8 Could someone check my answers?
The Age of Earth Unit Test, Unit 7, Lesson 8 Could someone check my answers?
[html]The Age of Earth Unit Test, Unit 7, Lesson 8 Could someone check my answers?4. Which is correct about the effectiveness of carbon dating?
A: They are both used to determine the relative ages of rocks and fossils.

5. Which statement i
ccnameb   121   1 Reply
A year ago
Could someone check my questions for the Age of Earth Unit Test, Unit 7, Lesson 8?
Could someone check my questions for the Age of Earth Unit Test, Unit 7, Lesson 8?
[html]Could someone check my questions for the Age of Earth Unit Test, Unit 7, Lesson 8?1. Which statement describes the relative age of a fossil that has formed inside a layer of rock?
A: The fossil is younger than the layer of rock it was
Ericxxd   114   1 Reply
A year ago
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