Answer:
75 J
Explanation:
After collapsing from the shelf. The ball falls one fourth of the distance down. If we calculate 100 - 1/4 ×100= 75 J.
A football is kicked 40 m. if the ball is is the air for 4 s, with what initial speed was it kicked.
Answer:
10m/s
Explanation:
formula will be speed = distance / time
distance = 40m
time= 4s
if you put them together will be
speed = 40m/ 4s
speed =10m/s
What is the momentum of a 4000g object moving to the left (negative direction) at 25 m/s?
Answer:
-100 kg · m/s
Explanation:
We can find the momentum of an object using the formula:
p = mv where p = momentum (kg * m/s), m = mass (kg), v = velocity (m/s), and p and v are vectorsLet's start by converting the mass of the object to kilograms.
4000 g → 4 kgSince the left direction is the negative direction, we know that the velocity of the object is -25 m/s.
Using these variables, we can solve for p in the formula.
p = mv p = (4 kg)(-25 m/s) p = -100 kg · m/sThe momentum of the object is -100 kg · m/s.
8. A partial food web is shown. The mourning dove is a bird that is often part of this food web. Which of these describes the mourning dove when it is part of the food web shown? A Parasite-host relationship with the robin because it uses the robin's nest. B Predator-prey relationship with tent caterpillars because they both use the same resources from the sugar-maple tree. C Producer-consumer relationship with sugar-maple trees because it gets food from the trees. D Producer-consumer relationship with its young because it feeds its young regurgitated food
Answer:
It has producer-consumer relationship with sugar-maple trees because it gets food from the trees.
Explanation:
The mourning bird is primarily a seed eater and not an insect eater. Since it is a seed eater, it will directly from the sugar-maple tree which is the producer.
In an ecosystem, the producers are plants which can trap energy directly from the sun during photosynthesis. This energy is passed on to the consumers.
Hence, the mourning bird has producer-consumer relationship with sugar-maple trees because it gets food from the trees.
3. A diagram showing the location of protons, neutrons, and ALL of the electrons in an atom.
A. Bohr Model
B. Orbital
C. Isotopes
D. Atomic number
Please answer this ASAP
Answer:
Bohr Model
Explanation:
PLEASE if you see these people (they all seem to have the same profile picture) NOTIFY THE PERSON ASKING THE QUESTION THAT THIS IS MALWARE AND REPORT IT!!
Stay safe, everyone!
(posting this in all subjects)
Answer:
ʕ •ᴥ•ʔ
Explanation:
I need help do in a hour
Which of these colors are the main colors of visible light? (Select all that apply.) green violet pink red indigo gold peach
Answer: The main colours of the visible light include:
--> red
--> Green
--> indigo
--> violet
Explanation:
Electromagnetic waves are waves that do not require or need a material medium for its propagation, but they travel successfully in free space (vacuum). These waves exist with an enormous range of frequencies called the electromagnetic spectrum.
Electromagnetic spectrum is defined as the range of all radiation possessing the special characteristics of electromagnetic waves arranged in order of their wavelength or frequency. The electromagnetic spectrum is made up of radio waves, infrared radiation, VISIBLE LIGHT, ultraviolet rays x- rays, gamma rays.
VISIBLE LIGHT: This is a small spectrum from the enormous range of frequencies of electromagnetic radiation. It provides radiant energy and makes things possible to be seen. The wave ranges from 4.5× 10^-7m to 7.0× 10^-7m. When the visible light is passed through a prism, it disperses into different wavelengths according to the colour make up. Dispersion of visible light produces the colors red (R), orange (O), yellow (Y), green (G), blue (B), (I) indigo and violet (V).
Therefore from the options given, red, Green, indigo and violet are examples of visible light spectrum.
A sound wave has a speed of
330 m/s and a wavelength of
0.372 m. What is the frequency
of the wave?
(Unit = Hz)
Explanation:
use the formula
speed = frequency x wavelength
330 = frequency x 0.372
330 / 0.372 = frequency
887 Hz = frequency
hope this helps, please mark it brainliest
A 1750 kg Ford Mustang Convertible and a 2222 kg Dodge Ram 4x4 truck were involved in a head on car crash. The Mustang initially moving at a velocity of 20 m/s rebounds off the truck with a velocity of 12 m/s. After the collision, the Dodge Ram rebounds with a velocity of 5 m/s. What was the velocity of the Dodge Ram before it collided with the Mustang?
Answer:
-1.3 m/s
Explanation:
It won't allow me submit, so be good to check the attachment
Answer:
-1.3 m/s
Explanation:
*A 15000 kg railroad car travels on a horizontal track with a constant speed of 12 m/s. A 6000 kg load is dropped onto the car. What will be the car's speed?
Answer:
8.57 m/s
Explanation:
From the question,
The total momentum of the car before the load was dropped = Total momentum of the call after the load was dropped.
Mu = (M+m)V........................... Equation 1
Where M = mass of the car, u = initial speed of the car, m = mass of the load, V = final speed of the load.
make V the aubject of the equation
V = mu/(M+m)...................... Equation 2
Given: M = 15000 kg, m = 6000 kg, u = 12 m/s,
Substitute these values into equation 2
V = (15000×12)/(15000+6000)
V = 180000/21000
V = 8.57 m/s
There are 1187 students in a large city school.
There are 42 classes in the school.
Approximately, how many students are in
each class?
Hur decision
Answer:
29 students
Explanation:
1187÷42= 28.26
separate sheet of paper for your answer.
1. A natural hazard that is triggered by a prolonged, heavy rainfall or by other
sources of water which increases the water content of the slope materials
A. Earthquake B. Landslides C. Sinkhole D Volcanic eruption
one carbonate
Answer:
I think its B. Please keep in mind that I could be wrong.
Explanation:
10 turns of wire are closely wound around a pencil as shown in the figure. when measured using a scale as shown, the length of total turns is obtained 25mm. then a) What is the thickness of the wire? b) Express the thickness of the wire in centimetre.
please write correct answer
Answer:
a. The thickness of the wire is 2.5 mm.
b. The wire is 0.25 cm thick.
Explanation:
Number of turns of the wire = 10
The length of total turns = 25 mm
a. The thickness of the wire can be determined by;
thickness of the wire = [tex]\frac{length of total turns}{number of turns}[/tex]
= [tex]\frac{25}{10}[/tex]
= 2.5 mm
Therefore, the wire is 2.5 mm thick.
b. To determine the thickness of the wire in centimetre;
10 mm = 1 cm
So that,
2.5 mm = x
x = [tex]\frac{2.5}{10}[/tex]
= 0.25 cm
The wire is 0.25 cm thick.
If C is the vector sum of A and B, C = A + B, What must be true if C = A + B?. What must be true if C = 0?.
what is principal focus and focus length with examples
Explanation:
Principle focus is the point on the axis of a convex lens, where the parallel rays of light from one side of the lens. meet on other side after refraction. Distance between optical centre to principle focus point is the focal length.
What is one reason that electromagnetic waves are used in long-distance communication?
A. They travel rapidly.
B. They move matter easily
C. They do not lose energy over long distances.
D. Informatioŋ can be encoded in the wave speed.
One reason that electromagnetic waves are used in long-distance communication is, that they do not lose energy over long distances. So Option C is correct
What are electromagnetic waves ?Electromagnetic waves are a type of wave that consists of oscillating electric and magnetic fields. They are propagated through space or through a material medium, and they have the ability to travel through a vacuum, which is the absence of matter. Electromagnetic waves have a wide range of frequencies, which determines the type of electromagnetic wave. The most familiar types of electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
One of the property of the electromagnetic waves is that they do not lose energy over long distances.
To know more about electromagnetic waves check:
https://brainly.com/question/16515517
#SPJ6
Which statements describe how heat flows in foil? Check all that apply.
Answer:
Heat flows from a warmer object to a cooler object.What is the net force on an object with a normal force of 750 N and gravity applying 750 N?
Answer:
[tex]Net_{F}[/tex] = 750N - 750N = 0N
Explanation:
The forces are balanced and there is no average Net force
please mark as brainliest! It is appreciated
Hope this helps! :)
What combination of things happen on earth that helps make wind, and the weather on earth? (Please list at least two factors, and explain the best you can!)
Answer:
There are six main components, or parts, of weather. They are temperature, atmospheric pressure, wind, humidity, precipitation, and cloudiness. Together, these components describe the weather at any given time. These changing components, along with the knowledge of atmospheric processes, help meteorologists—scientists who study weather—forecast what the weather will be in the near future.
Delilah does 170 Joules of work in 30 seconds. Adam does 260 Joules of work in 20 seconds. Who was more powerful?
Power = [tex]\frac{Work}{Time}[/tex]
Delilah: 170J/30s = 5.66 W
Adam: 260J/20s = 13 W
How much force is needed to accelerate a toy car of mass 8 kg at 2m/s
Answer:
4N
Explanation:
f = ma
8kg x 2m/s = 4N
III. A vehicle is travelling 105 km/h on a highway when the driver sees a moose in the
middle of the lane.
A. Determine the distance travelled by the vehicle while the driver is reacting.
Assume the driver's reaction time is 1.50 S.
Kevin has lived in a new apartment for 30 days. He realizes his back patio light has been on the entire time. The patio light used 100 watts of power for 720 hours. The cost of each kilowatt hour is $0.12. How much money has the patio light cost Kevin?
Answer:
$8640
Explanation:
kwh = P×t...................... Equation 1
Where P = power in watts, t = time in hours.
From the question,
Given: P = 100 Watts, t = 720 hours
Substitute these values into equation 1
Therefore,
The total kilowatt hour used by the patio light = 100×720
= 72000 kwh.
From the question,
If, 1 kwh ⇒ $0.12,
Then, 72000 kwh ⇒ $(0.12×72000)
= $8640
Hence, the patio light cost kevin $8640
which class of lever do spoon and scissors belong to?
Answer:
spoon and scissors belong to first class lever.
hope it is helpful to you
Describe the series of events that occurs when you place a call from a cordless telephone.
Answer:
you have no internet connection
An 1876 N crate is being pushed across a level force at a constant speed by a force of 747 N. What is the coefficient of kinetic friction?
0.16
0.40
0.08
not enough information
The crate only moves horizontally, so its net vertical force is 0. The only forces acting in the vertical direction are the crate's weight (pointing downward) and the normal force of the surface on the crate (pointing upward). By Newton's second law, we have
∑ F (vertical) = n - mg = 0 → n = mg = 1876 N
where n is the magnitude of the normal force.
In the horizontal direction, the crate is moving at a constant speed and thus with no acceleration, so it's completely in equilibrium and the net horizontal force is also 0. The only forces acting on it in this direction are the 747 N push (pointing in the direction of the crate's motion) and the kinetic friction opposing it (pointing in the opposite direction). By Newton's second law,
∑ F (horizontal) = 747 N - f = 0 → f = 747 N
The frictional force is proportional to the normal force by a factor of the coefficient of kinetic friction, µ, such that
f = µn → µ = f / n = (747 N) / (1876 N) ≈ 0.398188 ≈ 0.40
Can someone proofread this plz? I put my answers next to the number, so all I need you to do is proofread it. the picture for number 5 is pinned below.
Question 1 (1 point) A
Saved
Waves transfer energy through matter or space.
Question 1 options:
True
False
Question 2 (1 point) A
Saved
Mechanical waves can travel only though a _______________ such as a solid, liquid, or gas.
Question 2 options:
medium
vacuum
prism
anemometer
Question 3 (1 point) B
Saved
Which of the following is not a type of mechanical wave?
Question 3 options:
transverse
concave
surface
longitudinal
Question 4 (1 point) C
Saved
The particles in this wave move perpendicular to the direction of the movement of the wave. These waves are snake like.
Question 4 options:
surface
transverse
longitudinal
cyclone
Question 5 (1 point) A
Saved
The arrow points to an example of
Wave
Question 5 options:
rarefaction
sound barrier
compression
prism
Question 6 (6 points) 5,1,4,3,2,6
Saved
Match each term to its definition
Question 6 options:
answer here ___
Higher the pitch
answer here___
top of the wave
answer here___
Louder
answer here___
Distance from crest to crest
answer here___
bottom of the wave
answer here___
Height of wave
1.
Crest
2.
Trough
3.
Wave length
4.
Amplitude
5.
Higher the frequency
6.
Higher the Amplitude
Question 7 (1 point)
What is the resulting direction of a surface wave?
Question 7 options: C
opposite
circular
perpendicular
parallel
Question 8 (1 point) C
Constructive interference occurs when the crest of 2 waves meet. This can occur when 2 troughs meet as well. When this occurs, water waves look
Question 8 options:
larger
invisible
smaller
the same (no change)
Question 9 (1 point) C
Saved
Water waves are surface waves. The energy of the waves moves
Question 9 options:
both parallel and perpendicular to the wave
only parallel to the motion of the wave
only perpendicular to the motion of the wave
Question 10 (1 point) A
Which molecule makes up 3/4s of the surface of Earth?
Question 10 options:
CO2
NaCl
H2O
C6H12O6
Question 11 (1 point) A
Saved
Water does not expand when it freezes.
Question 11 options:
True
False
Question 12 (7 points) 3,4,1,2,7,6,5
Saved
Match the clue with correct answer
Question 12 options:
3
1
4
tributaries
1
estuary
2
6
7
chloroplast
6
3
5
nucleus
1.
Small rivers that flow into larger rivers
2.
Number of states that drain into Chesapeake Bay
3.
The Chesapeake Bay Watershed ranks what place in the US in terms of estuary size
4.
A body of water containing salt and fresh water.
5.
control center of cell
6.
The Cell Theory has how many statements?
7.
The site of photosynthesis
Question 13 (1 point) D
Saved
What do eukaryotes have that prokaryotes don't?
Question 13 options:
ribosomes
cytoplasm
plasma/cell membrane
nucleus
Question 14 (1 point) 1,4,3,5,2
Saved
Arrange in order from smallest to largest
Question 14 options:
1
cell
4
organ system
3
organ
5
organism
2
tissue
Answer:
i do believe you got them all right
good job :)
good luck :)
i hope this helps
have a great day !!
Answer:
._.
Explanation:
Noah and Nina are 15 m apart in a closed room. Noah
says the same sentence twice. The first time, Nina
does not hear the sound, but she does hear the
sentence the second time.
What best describes the difference between the
second sound wave and the first?
The second sound wave reflects off the walls of the
room, so Nina is able to hear the sound.
O The second sound wave travels faster to Nina, so
less energy is dissipated through the air.
O The air molecules in the compressions of the
second wave are more dense, so the sound is
louder
The air molecules in the second wave are spaced
evenly, so a high-frequency wave is produced.
Answer:
The air molecules in the compressions of the second wave are more dense, so the sound is louder.
Explanation:
In a closed room, Noah and Nina are sitting 15 m apart.
As Noah says the same sentence twice, Nina does not hear the sound the first time but she does hear the sentence the second time.
This happens as the air molecules in the compressions of the second wave are more dense. As a result, the sound is louder.
The correct option is ''The air molecules in the compressions of the second wave are more dense, so the sound is louder''
Answer:
C. The air molecules in the compressions of the second wave are more dense, so the sound is louder.
Explanation:
I can confirm that the answer to your question is C.
how can we realize that light travel in straight line ?
Answer:
It can be seen from the operation of pin-hole camera, formation of shadows and eclipse.
Explanation:
The phenomenon of light traveling in a straight line is known as rectilinear propagation of light.
One this evidence can be seen from the operation of pin-hole camera, which depends on rectilinear propagation of light
Also two natural effects that result from the rectilinear propagation of light are the formation of Shadows and Eclipse.
in desert the day are very hot and night are very cold ,why?
Answer:
Sand doesn't hold heat well. The sun heats up the ground during the day and when night comes along, the sand loses all it's heat
