The Direction of the Velocity Vector
Objects moving in uniform circular motion will have a constant speed. Velocity, being a vector, has both a magnitude and a direction. The magnitude of the velocity vector is the instantaneous speed of the object.
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10 20
What is one standard kilogram define in Si system
Answer:
The mass of cylinder made up of alloy of platinum iridium that is kept at international bureau of weights and measures is called one standard kilogram.
The system of seven fundamental quantities is called SI system .
How long does it take an object to accelerate from 12 m/s to the right to 32 m/s to
the right with an acceleration of 5 m/s2 to the right?
Answer:
4 seconds
Explanation:
Given:
v₀ = 12 m/s
v = 32 m/s
a = 5 m/s²
Find: t
v = at + v₀
32 m/s = (5 m/s²) t + 12 m/s
t = 4 s
If size of an image is 10 cm and the magnification produced by a mirror is +1, what will be the size of object?
Answer:
h = 10 cm
Explanation:
The magnification produced by a mirror is given by :
[tex]m=\dfrac{h'}{h}[/tex]
h' is the image size and h is the object size
We have, h = 10 cm, m = +1
So,
[tex]m=\dfrac{h'}{h}\\\\h=\dfrac{10}{1}\\\\h=10\ cm[/tex]
So, the size off the object is same as that of the size of the image i.e. 10 cm.
A car travels at a constant 1km per hour in the positive direction down a straight line highway. What is the displacement of the car 45 seconds later?
Explanation:
1 km/hr × (1000 m/km) × (1 hr / 3600 s) × 45 s = 12.5 m
What is a hypothesis?
A.
a statement that can be tested through a scientific investigation
B.
a description of the steps involved in an experiment
C.
a statement that summarizes the results of an experiment
D.
a question that cannot be scientifically tested
Answer:
A
Explanation:
a statement that can be tested through the scientific method
In need of help!!!!!!
Answer:
b
Explanation:
because it fly and you need for it to drop at the right spot for them to get it
Which of the following is not a way to make exercising on a cold day safer?
A. Wear gloves and thick socks.
B. Dress in several layers instead of wearing one bulky garment for warmth.
C. Drink hot tea during your workout.
D. Wear a synthetic or wool hat.
I NEED HELP ASAP FIRST ANSWER GETS BRAINLIEST
Answer:
D.
Explanation:
I think its D. because Tea during a cold workout isnt safe at all. Drinking tea while working out adds weight and you just simply dont need tea when working out.. Hope this helps man :)
C. You shouldn't exercise while drinking hot tea because you can spill it and burn yourself especially while on a treadmill.
If this helped please mark me as brainliest!
[tex]\left[\begin{array}{ccc}Thanks,\\JustSomeIdiot\end{array}\right][/tex]
The friction of the water on a boat produces an acceleration of -10 m/s2. If the
boat is traveling at 30 m/s and the motor is shut off, how long does it take the boat
to slow down to 5.0 m/s?
a
2.5 s
b 2.35
c
2.2 s
d
2.0 s
Answer:2.5s
Explanation:
Idk I guessed and got it right
Friction is the force that exists between two surfaces that are sliding or attempting to slide across each other.
The acceleration produced by the friction of water is a = [tex]-10 m/s^2[/tex]
The boat takes 2.5 seconds to slow down.
What causes of friction?Surface roughness: When two rough surfaces collide, they generate frictional force or an opposing force, which can sometimes be converted into heat. Body deformation: Deformations in the body or the surface of the body in contact may cause friction during motion.Friction is the force that exists between two surfaces that are sliding or attempting to slide across each other. For example, friction makes it difficult to push a book across the floor. Friction always acts in the opposite direction that the object is moving or attempting to move.The equation that rules the change of velocities is:
[tex]V = V _0 + at[/tex]
Where:
a = acceleration
Vo = initial speed
v = final speed
t = time
The acceleration produced by the friction of water is a = [tex]-10 m/s^2[/tex] and the boat is initially traveling at v=30 m/s. When the motor is shut off, the boat will start braking until it stops. We need to find the time it takes to ready the final speed of v=5 m/s.
t = [tex]\frac{V - V_0 }{a}[/tex] = -5-30 /10 = 2.5 s.
The boat takes 2.5 seconds to slow down.
To learn more about : Friction
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Help please I give brainliest
Answer:
can someone help me with physics to
Answer:
equation D=mass/volume
D=m/v
example sample : D=m/v= 250/100 = 2.5 g/cm³
1- D=m/v = 454/2274 = 0.2 g/cm³
2- 1 liter = 1000 cm³
D=m/v=1000/1000= 1 g/cm³
3 - d=m/v
0.6 g/cm³=m / 1.2 cm³
m=0.6*1.2 = 0.72 g
4: a:171/15 = 11.4 g/cm^3 lead
b:148/40 = 3.7 g/cm^3 Aluminum
c:475/250 =1.9 g/cm^3 Bone
d: 680/1000 = 0.68 g/cm^3 Gasoline (lithium)
5: the density of a substance equal to the mass of the substance divide by volume
Match the element with its description.
Column A
1. Sodium :
2. Silicon :
3. Bromine :
4. Argon:
Column B
a. Nonreactive gas
b. Has properties of both metals and nonmetals
c. Malleable, soft, and shiny
d. Highly reactive gas
What are the matches?
Answer:
1.c
2.b
3.d
4.a
Explanation:
There are your answers
Answer:
Sodium---Malleable, soft, and shiny
Silicon---Has properties of both metals and nonmetals
Bromine---Highly reactive gas
Argon---Nonreactive gas
Use the reaction equation to answer the question
6CO2 + 6H20 - C6H12O6 + 602
The reaction equation shows a common chemical reaction. Where does this reaction commonly occur?
A
in soap mixed with oil
B
in candle wax as it burns
С
in the leaves of a plant
D
in animals digestive systems
Answer:
C
Explanation:
in the leaves of a plant where photosynthesis occurs
Can you tell me what a substance is
Answer:
Explanation:
a particular kind of matter with uniform properties.
Answer:
a particular kind of matter with uniform properties or the real physical matter of which a person or thing consists and which has a tangible, solid presence.
Explanation:
PLEASE HELP!! IM DUMB!!!!
In the atom nearly all the mass is found in the _______.
A. protons
B. nucleus
C. neutrons
D. electrons
1. Reflection Question: What are some actions or activities that can affect your heart rate and respiratory rate and cause either or both of them to increase or decrease?
Answer:
There are following two activities which affect heart rate and respiratory rate.
1-Exercise
2-Hiking
Explanation:
when we are exercising or hiking our heart rate and respiratory rate affected. This is because during hiking and exercising our body may need three or four time your normal cardiac output. This is because our body consuming energy during the workout and our muscles needs more oxygen. To meet the need of energy and oxygen respiration rate become fast and heart rate also increase.
how does mass affect gravity????
The elements least likely to form bonds are found in which group?
O 15
O 16
017
O 18
The element that is least likely to form bonds is found in group 18. Thus, the correct option for this question is D.
What is group 18 of the periodic table known?The elements of group 18 in the modern periodic table are known as noble gases. These gases are colorless, odorless, tasteless, and nonflammable under standard conditions.
They were once labeled group 0 in the periodic table because it was believed they had a valence of zero, meaning their atoms cannot combine with those of other elements to form compounds.
Due to this fact, they would not have any ability to form bonds with other elements in order to produce compounds or molecules. They are the most stable elements because they have a full outer shell of valence electrons, so they have no need to bond with other elements.
Therefore, the element that is least likely to form bonds is found in group 18. Thus, the correct option for this question is D.
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Why does stone take so long to cool?
Answer:
Stone has what's called a high thermal conductivity, which is simply a fancypants way of saying that it allows heat to flow through it quickly. For example, suppose the piece of stone in question is at room temperature, or 70 degrees. Your body likes to keep an average toasty temperature of 98.6F.
8
An airplane flies 8000 m in 30 seconds. Calculate the velocity of the airplane. U
(10 Points)
O 0.27 m/s
16 m/s
267 m/s
24,000 m/s
Answer:
267
Explanation:
8000/30= 266.666666667
or 267 rounded to the nearest whole
What does this indicate about the claim?
claim
[klām]
VERB
state or assert that something is the case, typically without providing evidence or proof.
"he claimed that he came from a wealthy, educated family" · [more]
synonyms:
assert · declare · profess · maintain · state · hold · affirm · avow · aver · [more]
NOUN
an assertion of the truth of something, typically one that is disputed or in doubt.
"he was dogged by the claim that he had CIA links" · [more]
synonyms:
assertion · declaration · profession · affirmation · avowal · averment · protestation · representation · contention · submission · case · allegation · pretense · asseveration
a demand or request for something considered one's due.
"the court had denied their claims to asylum"
Answer:
the first person is right at all
WILL GIVE BRAINILY TO FIRST PERSON TO ANSWER!!!!
Complete this sentence. If volume remains the same while the mass of a substance ________, the density of the substance will_______________. increases, stay the same decreases, stay the same decreases, increase increases, increase
The answer is increase.
d = m/v. if you increase the mass without changing the volume, the density will increase.
An object of mass 30 kg is falling in air and experiences a force due to air resistance of 50 newtons. Determine the net force acting on the object:
Explanation:
Draw a free body diagram. There are two forces: weight force pulling down and air resistance pushing up.
Sum the forces in the y direction:
∑F = 50 N − (30 kg) (10 m/s²)
∑F = -250 N
The smallest units of life that make up all living things are Group of answer choices tissues organ system organs cells
Answer:
Cells is your answer
Explanation:
Cells are the basic unit of life
hope this helped you
please mark as the brainliest (ㆁωㆁ)
What makes human travel to the other planets in our solar system difficult?
Answer:
Taking water and oxygen from Earth is rather expensive and hard to do.
Explanation:
Without water and oxygen, travel to other planets is basically impossible
What is the exact mass (a.m.u) of a electron? (First correct answer get Brainiest)
Answer:
0.00054386734
Explanation:
9.1093897*10-31 kg = 0.00054386734
describe how changing the particles changed the atom
Answer: During chemical changes particles do change with atoms or ions regrouping . Bonds (links) between atoms break and new ones form and energy is either given out or taken in.
Explanation:
Chemical reactions make particles to change and resulting to change atoms or ions via regrouping .
What is chemical reaction?The chemical reaction is the reaction between two reactants that led to the formation of products.
The products are substances that forms after reaction. The reactants are the substances which are original materials.
Bonds between atoms break and make new ones. In this process, energy is either rejected or taken in.
The particle are the electrons which are shared between the atoms of same or different elements.
The electrons in the valence get donated or accepted by the atoms and form bond. When the electrons are donated, the bonds break and when electrons are accepted, bonds are formed. So, the new element or compound is formed.
Thus, the chemical reaction are responsible for change in atoms due to change in particles.
Learn more about chemical reaction.
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Please help me! Ill give brainliest who helps me first!!!!
What is one difference between mixtures and pure substances?
A. mixtures can be physically separated
B. mixtures are made of one type of atom
C. pure substances have no chemical bonds
D. pure substances can be physically separated
List one benefit and one limitation of using scientific models.
Answer:
the benefit is that they can see and experiment on the model but some times the model isn't accurate resulting in immediate failure
im only 13 sorry if this is wrong i tried.
(i feel so dumb )
10. Mrs. Wichert walked Riley for 30 minutes and a distance of 300 meters. Riley stopped often to smell things.
Which is the correct answer?
•Her speed was 10 meters/ minute
•Her speed was 9000 meters/minute
•Her average speed was 10 meters/minute
•Her velocity was 10 meters/minute
what is torque...........m
Answer:
Torque is the rotational equivalent of linear force. Torque is the engine's rotational force.
Hope this helps..
Explanation:
hey can anyone help me out pls!
If you try to squish a table it aint gonna move. That is because,
C. They are packed closely together.
A isn’t true.
B is true, they do vibrate, but that is NOT the reason why it doesn’t change when pressure is applied.
D is wrong because C is correct.