Which is an example of the law of inertia?
A. A rocket taking off from earth
B. A crash dummy flies through a windshield in a collision
C. A small rock skips on a pond faster than a small rock
Answer:
B
Explanation:
Law of Inertia states, a body stays in rest or motion unless an ouside force causes change.
At which position would a cat on Earth have least amount of pull due to gravity?
in a cat bed on the ground
on a second floor window sill
in a plane flying above Earth
Answer:
in a plane flying above Earth
Explanation:
Gravity is the force that draws objects toward center of the earth. If you throw an object up on the earth's surface, you will notice that it will fall back to the ground due to the earth's gravitational pull on the object.
However, the further one goes from the earth's surface, the lesser the gravitational pull. Therefore the cat will experience less gravitational pull in an airplane flying at a higher altitude.
testing asking a question.
Answer:
i- testing testing,, 1 2 1 2
Answer:
?
Explanation:
Did it work how you wanted?
Julie and Ashwin were doing an experiment in the classroom. They
each had to move a 15 kg box. Julie was able to move her box, but
Ashwin was only able to move his after removing half the items in the
box. Which is true regarding the force he applies after removing the
items from the box?
A. He has to apply the same amount of force to the box to overcome gravity.
B. He has to apply less force to lift the box because the mass has decreased.
C. He has to apply a different type of force of the changing the mass.
D. He has to apply more force to lift the box because the mass is greater
Please answer ASAP
Julie and Ashwin were doing an experiment in the classroom. They each had to move a 15 kg box. Julie was able to move her box, but Ashwin was only able to move his after removing half the items in the box. The true statement is Ashwin has to apply less force to lift the box because the mass has decreased.
What is force?A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
The equation for force is
F=ma
If m is decreased by half, then f decreases as well. It takes less force to push a lighter object across the floor. Ashwin has to apply less force to lift the box because the mass has decreased.
True regarding the force he has to apply less force to lift the box because the mass has decreased
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An airplane flies for 1.25 hours with a constant speed of 1080 km/hr and then for another 2.5 hours with a constant speed of 984 km/hr. How far (what distance) did it go?
Answer:
i think its 3583.2km skskks
Answer:
840 km/h divided by 60 = 14km/min
3 x 60 = 180
180 + 20 = 200 minutes total
14 x 200 = 2800km
that is a really awkward way of doing it though. really you can just do:
840 x (10/3) = 2800km
help please I have to turn this in tonight!!
An atom has an equal number of neutrons and electrons. True or false
Answer:
True
Explanation:
i searched it up and well this thing is making me do it up till 20 characters long so yea
A total of 288 books was evenly divided among 6 elementary schools and 7 middle schools. What is the best estimate for the number of books each school received?
Answer:
22 books
Explanation:
Total number of books = 288books
Total number of schools = 6 + 7 = 13
If the books are distributed evenly, it means it was distributed in such a way that all the school has equal number of copies.
Each book will receive 288/13 copies
288/13 = 22.15
Hence the best estimate for the number of books each school received is 22 books
Evaluate the scenarios and select the one that demonstrates the training principle overload.
kai swims faster and faster every day.
Katie stays consistent in her routine.
Maggie does kickboxing daily so she can win a kickboxing match.
Sarah usually likes to run, but tries swimming.
Answer:
The answer is A.
Explanation:
The answer is A. because overload means to do more and Kai swims more and more every day.
An astronaut weighs 890 N on Earth. What is the astronaut's weight on the Moon? Acceleration due to gravity on the Moon is 1.62 m/s^2.
Answer:
Explanation:(a) What is her weight on earth? (b) What are her mass and her weight on the moon, where g = 1.62 ms–2? Solution: (a) On earth. W = m g = 55.0 x 9.8 = 539 N. (b) On moon, her mass remains the same, but the acceleration due to gravity
The average diameter of an atom is ________
(a) 10“8 m
(b) 1 m
(c) 1A°
(d) 10
Answer
0.1 - 0.5 nano meters
Explanation:
Here ya go buddy! :D
About 50,000 years ago, in an area located outside Flagstaff, Arizona, a giant 4.5 107-kg meteor fell and struck Earth, leaving a 180-m-deep hole now known as Barringer crater. If the meteor was traveling at 20,000 m/s upon impact, with what average force did the meteor hit the earth?
Answer:
[tex]F_A =5.625*10^1^6N[/tex]
Explanation:
From the question we are told that
50,000 years ago,
A giant 4.5 107-kg meteor
180-m-deep hole
20,000 m/s
Generally for this problem the energy change is given as
[tex]\triangle E=\frac{1}{2} mv^2 +mgd[/tex]
Having the potential and kinetic energy in place
Mathematically solving for Average force[tex]F_A[/tex]
[tex]\triangle E=F_a*d[/tex]
[tex]F_A =\frac{1/2* 4.5*10^7(20,000)^2-kg+4.5*10^7*9.81*160}{160}[/tex]
Therefore Average force [tex]F_A[/tex] is given by
[tex]F_A =5.625*10^1^6N[/tex]
When the velocity of an object is tripled, by what factor is its momentum changed ?
Answer:
also tripled, factor of 3
Explanation:
equation of momentum is p = m * v , where p=momentum, m=mass, and v=velocity
if m is unchanged
p1 = m1 *v1
p2 = m2 *v2
m1 = m2 and v2 = 3*v1
p2 = m1 * 3v1 = 3*p1, tripled momentum
A dog sled was moving to the right on an icy surface with low friction, when the connecting rope between the sled and the dogs broke. What happens to the motion of the sled? *
Answer:
The sled will slow down in speed
Explanation:
According to Newton's first law of motion, a body will continue to be at rest or uniform motion unless acted upon by an external force.
In this situation, once the connecting rope between the sled and the dogs breaks, the motion of the sled will reduce because it is no longer connected to the dog that is providing the motion, hence the source of motion is no longer connected to the sled
In 5 seconds a car moving in a straight line increases its speed
from 50 km/h to 65 km/h, while a truck goes from rest to 15
km/h in a straight line. Which undergoes greater aceleration?
What is the acceleration of each vehicle
Explanation:
because the track and the car moved same speed there their acceleration will be the same
a) The acceleration of the car and the truck are equal since for both vehicle is 15km/h and the time taken for both vehicle is also the same 5s.
b) The acceleration of the each vehicle is 0.83334 m/s².
Given data in the question is,
Time taken for both car and truck, t = 5 seconds
Initial velocity of car, Uc =50km/hr =13.8889 m/s
Final velocity of car, Vc = 65 km/hr = 18.0556 m/s
Since the truck starts from rest,
Initial velocity of the truck Ut =0
Final velocity of the truck Vt = 15 km/hr = 4.16667 m/s
What is acceleration?Acceleration can be defined as the rate of change of velocity.
a) The acceleration of the car and the truck are equal since for both vehicle is 15 km/h time taken for both vehicle is also the same 5s.
b) The acceleration of each vehicle is to determine.
To determine the acceleration for car and the truck , we use the first equation of motion:
v = u+ at
Where v is the final velocity,
u is the initial velocity,
a is the acceleration,
t is the time.
Now, For the car,
13.8889 m/s = 18.0556 m/s + ( a × 5)
a = [tex]\frac{ 18.0556 m/s- 13.8889 m/s}{5}[/tex]
a = [tex]\frac{4.1667}{5}[/tex]
a = 0.83334 m/s².
Hence, the acceleration of the car is 0.83334 m/s².
For the truck,
4.16667 m/s = 0 + (a× 5)
a = [tex]\frac{0-4.16667}{5}\\[/tex]
a = [tex]\frac{4.16667}{5}[/tex]
a = 0.83334 m/s²
Hence, the acceleration of the bicycle is 0.83334 m/s².
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Hot liquids and gasses move in one direction
Answer:
some times the glass breaks
Explanation:
how many atoms are in each product silver sulfide
there are 3 atoms in each silver sulfide
Name the type of energy transfer:
You fry an egg on a hot car engine.
Answer:
I think the heat would transfer from the engine, because of this it would cook the egg
Explanation:
hopes this helps
The thermal heat energy transfer happens when we fry an egg on a hot car engine because the thermal energy lost from the engine is utilized for cooking the egg,
What is thermal energy?It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.
Thermal energy transfer is utilized while cooking food in our day-to-day life, frying egg is one such example of application of the thermal energy for cooking food.
Almost two third of the heat from any thermal engine is lost to the surroundings.
When we fried an egg on a hot vehicle engine, thermal energy is transferred because thermal energy lost from the engine is used to cook the egg.
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What is the main function of the mitochondria in a cell?
Answer:
Below :)
Explanation:
It is the powerhouse of the cell and creates chemical energy.
Describe the relationship between the forces of attraction and the kinetic energy of particles in a solid, a liquid and a gas
Answer:
Described below
Explanation:
1) Solids: In solids, the strong attractive forces between the particles ensure that the particles are packed tightly enough and this means little or no movement between each other. However, when they experience vibration which has relationship with the kinetic energy between them
2) Liquids; In liquids due to the lesser forces of attraction between the particles, it means they tend to glide over each another but however, toward the bottom of the container they will settle. This means that the attractive forces between the liquid particles are barely strong enough to hold onto a specific volume. However, they are not strong enough to keep the molecules from sliding over one other.
3) Gases; In gases, there is almost no existing attractive force in most cases and as a result we can say the kinetic energy of the gas molecules is always greater than the attractive force between them and they are therefore far apart from each other and also move independent of each other.
An object is place 30.5 cm from a convex lens that has a focal length of 8.0cm.where is the image ?
Answer:
Image is between F and 2F. And the exact location is:
q = 10.84 cm
Explanation:
The convex lens form different kinds of images with different sizes and locations, for the different positions of an object. In this case, the object is placed 30.5 cm from the convex lens with a focal length of 8 cm. This means that it is the case of the object placed beyond 2F. In this case, the image formed has the following characteristics:
1. Image is real.
2. Image is inverted
3. Image is diminished
4. Image is located between F and 2F
For exact location we use the thin lens formula:
[tex]\frac{1}{f} = \frac{1}{p} + \frac{1}{q}[/tex]
where,
f = focal length = 8 cm
p = object distance = 30.5 cm
q = image distance = ?
Therefore,
[tex]\frac{1}{8\ cm} = \frac{1}{30.5\ cm} + \frac{1}{q} \\\frac{1}{8\ cm} - \frac{1}{30.5\ cm} = \frac{1}{q}[/tex]
q = 10.84 cm
how can we make periscope
Answer:
place a curved elbow joint pipe over each end of the pipe to make a periscope
A wave traveling througil air meets an object and bounced off its flat surface
at a new angle. Which statement best describes what has happened to the
wave?
A-the object had a slit in its surface that diffracted the wave. B- the object caused the wave to refract. C-the object absorbed the waves energy. D- the object reflected the wave.
Answer:
B.) the object caused the wave to refract
Explanation:
The object has caused the wave which is traveling through the air to refract back. Thus, the correct option is B.
What is refraction of wave?Refraction is the phenomena which includes the change in the direction of waves which occurs when the waves travel from one medium to another medium. Refraction is always accompanied by a wavelength and change in speed of the wave. Diffraction is the bending of waves of sound and light which takes place around the obstacles and openings.
A wave traveling through the air meets an object and bounced off its flat surface at a new angle will experience refraction of waves.
Therefore, the correct option is B.
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Which chemical layer of Earth is creating rift valleys?
✧･ﾟ: *✧･ﾟ:* *:･ﾟ✧*:･ﾟ✧ Answer:✧･ﾟ: *✧･ﾟ:* *:･ﾟ✧*:･ﾟ
continental crust
✧･ﾟ: *✧･ﾟ:* *:･ﾟ✧*:･ﾟ✧ Explanation:✧･ﾟ: *✧･ﾟ:* *:･ﾟ✧*:･ﾟ✧
Continental rifting
If the diverging plates are capped by continental crust, fractures develop that are invaded by the ascending magma, prying the continents farther apart. Settling of the continental blocks creates a rift valley, such as the present-day East African Rift Valley.
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Bus with a weight of 650 N is sitting on the ground and the bottom of the box measures 0.5 m by 0.7 m. What is the pressure exerted by the box on the ground?
Answer:
185.71 N
Explanation:
Weight = 650N
Dimensions of box = 0.5m by 0.7m
Pressure = ?
The relationship between these quantities is given by;
Pressure = Weight / Area
Area = 0.7 * 0.5 = 3.5 m^2
Pressure = 650 / 3.5 = 185.71 N
the table below shows the effect conditions on a car stopping distance. in witch condition was the car travelling most slowly
Answer: Car 5
Explanation:
Higher speeds mean higher braking times so the car with the highest braking distance was travelling the the fastest and the car with the lowest braking distance was traveling the slowest.
Braking distance = Stopping distance - Thinking distance.
Car Braking distance
1 38
2 50 = 65 - 15
3 75
4 75
5 14 = 23 - 9
Car 5 had the lowest braking distance so was going the slowest.
How much work does it take to lift a 1000 kg elephant into a truck bed that is 1 meter of the ground? (answer in joules)
Answer:
1000 joules
Explanation:
How did the lunar maria form?
A. Rivers carried sediments from the
highlands to the lowlands.
B. Lava flowed from the moon's interior onto its surface.
C. Meteorites flattened the mountains.
D. Shallow oceans evaporated, leaving broad areas covered with sand.
Answer:
In my knowledge
Option B. Lava flowed from the moon
and I am pretty sure cause I have read about it and option B is the conclusion I came with lol :D
A car covers 100 km in 2 h , what is the speed of the car. I want full answer
Answer:
Distance = 100kmTime = 2hoursSpeed = Distance/Time = 100km 2hrSpeed= 50km/ hrI hope it helps ❤❤how many basic forces are there in the universe?
Answer:
Four basic fources.
Explanation:
Fundamental force, also called fundamental interaction, in physics, any of the four basic forces—gravitational, electromagnetic, strong, and weak—that govern how objects or particles interact and how certain particles decay. All the known forces of nature can be traced to these fundamental forces.
While eating lunch high up in a skyscraper, two construction workers calculate their gravitational potential
energies, and find them to be equal. If the lighter construction worker has a mass of 90kg, and the other worker
is twice as high up in the skyscraper, what is the mass of the other worker?
Answer:
The mass of the other worker is 45 kg
Explanation:
The given parameters are;
The gravitational potential energy of one construction worker = The gravitational potential energy of the other construction worker
The mass of the lighter construction worker, m₁ = 90 kg
The height level of the lighter construction worker's location = h₁
The height level of the other construction worker's location = h₂ = 2·h₁
The gravitational potential energy, P.E., is given as follows;
P.E. = m·g·h
Where;
m = The mass of the object at height
g = The acceleration due to gravity
h = The height at which is located
Let P.E.₁ represent the gravitational potential energy of one construction worker and let P.E.₂ represent the gravitational potential energy of the other construction worker
We have;
P.E.₁ = P.E.₂
Therefore;
m₁·g·h₁ = m₂·g·h₂
h₂ = 2·h₁
We have;
m₁·g·h₁ = m₂·g·2·h₁
m₁ = 2·m₂
90 kg = 2 × m₂
m₂ = (90 kg)/2 = 45 kg
The mass of the other construction worker is 45 kg.