car moves with a speed of 72 km/hr for 20 minutes and then with the speed of 60 km/hr for 15 minutes. The total distance covered by the car is.........
35 km
36 km
39 km
40 km
Holly is conducting an experiment in which she changes the voltage across a circuit and records the relative brightness of a light bulb in the circuit. She takes notes in the notebook below.
How might these notes be useful?
A.
They could help her teacher to understand what she did in the experiment.
B.
They could help someone interested in conducting the same experiment.
C.
They could help her remember the experiment in the future.
D.
all of these
Reset Submit
Answer:
all of these
Explanation:
Answer:
D.all of there
Explanation:
18. Reference samples come from a source that is O known O scientific method O physical evidence O individual characteristics
Answer:
O scientific method
Explanation:
A hammer falls from a construction worker's hand 30m above the ground at the same time that a filled soft drink can is projected vertically upward from the ground at a velocity of 24 m/s. Where and when will the two objects meet?
For harmer:-
initial velocity=u=0m/sAcceleration due to gravity=10m/s^2Now
[tex]\\ \sf\longmapsto s=ut+\dfrac{1}{2}gt^2[/tex]
[tex]\\ \sf\longmapsto s=0t+\dfrac{1}{2}(10)t^2[/tex]
[tex]\\ \sf\longmapsto s=5t^2\dots(1)[/tex]
For soft drink:-
u=24m/s[tex]\\ \sf\longmapsto 30-s=(24)t+\dfrac{1}{2}(10)t^2[/tex]
Using eq(1)[tex]\\ \sf\longmapsto 30-5t^2=24t-5t^2[/tex]
[tex]\\ \sf\longmapsto 24t=30[/tex]
[tex]\\ \sf\longmapsto t=\dfrac{30}{24}[/tex]
[tex]\\ \sf\longmapsto t=1.2s[/tex]
After 1.2s they will meet.Now
putting t in eq(1)
[tex]\\ \sf\longmapsto s=5t^2=5(1.2)^2=5(1.44)=7.2m[/tex]
At the height of 7.2m they will meet
NEED HELP!!!!
When people are sick, it is often recommended that they consume a lot of liquids, particularly water. What is the biological basis of this advice?
OPTIONS:
A.
Water will help flush toxins out of the body.
B.
Drinking will distract them from their illness.
C.
It is always easier to drink than to eat if you are sick.
D.
They are probably sick because they were dehydrated.
PLEASE NO LINKS
Answer:
A.
Explanation:
Drinking water usually helps with gaining hydration cause usually when you get sick you get weak. thats what u think though
Water will help expel toxins from the body that's why it is recommended to sick people to consume more water. Therefore, option (A) is correct.
Why is it important to stay hydrated during sick?Proper hydration can be helpful to the skin and mucous cell membranes play a barrier to stop bacteria from entering the body when sick with a virus. Fluid can also help decrease irritation when sneezing, coughing, and even breathing.
Water can help to regulate body temperature, maintain healthy skin and joints, digest food, and help the brain function at its best. Producing requires bodily fluids, like tears and saliva, and removing waste through sweat, and urination.
Dehydration can happen when we lose a high amount of bodily fluids than we’re consuming. This can occur through bodily functions that bring the loss of fluids and electrolytes.
Therefore, it is important to stay hydrated when you are sick.
Learn more about body dehydration, here:
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What is the difference between thrust and applied force?
Answer:
Thrust acts on the accelerated object in the direction opposite to the applied force hence it accelerates the object in the direction opposite to the applied force. ... Its magnitude is equal to that of applied force. It always increases the velocity of the object.
Explanation:
3 situations that give friction a “bad reputation”
Newton's 3rd law is.
C. Force = Mass x Acceleration
B. An object in motion will stay in motion unless acted upon
A. For every action there is a reaction
42. The object in the figure is made of
a material of density 3000 kg/m3.
What is the tension in the rope,
which suspends the object, when
it is completely immersed in
water. The mass of the object is
200 kg.
TO?
Answerpov:
Explanation:
help i dont know vfvvfvf
Answer:
20 steps is his displacement
express one light year into SI unit
Explanation:
The light-year, alternatively spelled lightyear, is a unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (9.46×1012 km) or 5.88 trillion miles (5.88×1012 mi).hope it helps.stay safe healthy and happy.What is dark matter Pls explain!
Answer:
Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe. ... Most dark matter is thought to be non-baryonic in nature; it may be composed of some as-yet undiscovered subatomic particles.
What are the values of temperature and pressure under STP, using the units of kelvin and kilopascals?
Answer: STP is 273.15 K and 0.986 92 atm.
Explanation:
STP is defined as 273.15 K and a pressure of exactly 100 kPa (1 bar).
Hope this helps! :)
explain the energy transformation processes in an electromagnet
Answer:
Explanation:
It transfers from mechanical energy, to electrical energy to chemical energy. The energy transformation in an electromagnet is from chemical to electrical to electromagnetic waves. The north poles of two different magnets will attract each other.
will the star of bethlehem be visible on december 21st
Answer:
The best time to view the spectacle on Dec. 21 will be around an hour after sunset.
A 69.0 N object accelerates to the right at 4.5 m/s^2. What is the normal force acting on the object.
Answer:
thanks for the ok points
Explanation:
please don't delete this
I'm sorry I can't answer your question ok bye
An atom of an element is electrically neutral because the
O Number of protons = the number of electrons
O Number of protons = the number of neutrons
O Number of electrons = number of neutrons
Answer:
option two
Explanation:
Number of protons = the number of neutrons
the question says "___________________ was the inventer of the radio?
please answer it
what is the modern symbol for the element Bo
Answer:
Bo (modern symbol B) = Boron
Explanation:
Hope this helps
Newton's second law of motion gives the .............
definition of force
unit of force
nature of force
none of the above
Answer:
definition of force
Explanation:
It states that "the rate of change in momentum is proprtional to the force applied"
[tex]{ \rm{momentum = mass \times velocity}} \\ [/tex]
• from the law stated:
[tex]{ \rm{ \frac{ \delta momentum}{time} = force}} \\ \\ { \rm{ \frac{mv - mu}{time} = force}} \\ \\ { \rm{ \frac{mass(v - u)}{time} = force}} \\ \\ { \rm{mass \times \frac{(v - u)}{time} = force }}[/tex]
• from first newton equation:
[tex]{ \boxed{ \tt{ \frac{v - u}{t} = acceleration}}} \\ [/tex]
• therefore
[tex]{ \rm{mass \times acceleration = force}} \\ \\ { \boxed{ \rm{force = mass \times acceleration}}}[/tex]
v is final velocityu is initial velocityt is time10. A child drops a ball from a window. The ball strikes the ground in 3.0 seconds. What is the velocity of the ball the instant before it hits the ground?
Four different blocks are resting on the floor. They each have a different mass, and they are each made of a different material, so the coefficients of friction are not the same. Using the information in the table below, rank, from highest to lowest, the magnitude of the maximum horizontal force
To answer this question, it is necessary to apply the static condition from Newton´s Laws
The solution is:
Fd > Fc > Fa > Fb
From the body free diagram, and from the second Newton´s law of movement we get:
∑ Fx = 0 F - Fr = 0 F = Fr Fr = μ×N
∑ Fy = 0 N = m×g ⇒ Therefore Fr = μ×m×g
F = μ×m×g g is the same in all the cases, then we just compare the products μ×m
So when F is just greater than Fr, the body will start moving
we make a table, with values from the information table.
1.- μ×m = 0.5× 40 = 20
2.-μ×m = 0.4× 80 = 16
3.- μ×m = 0.7× 30 = 21
4.- μ×m = 0.9× 35 = 31.5
According to the table, from highest to lowest the magnitude of the horizontal force is:
Fd > Fc > Fa > Fb
RelatedLink: https://brainly.com/question/16799228
PLEASE HELP. SO HARD. SCIENCE ASSIGNMENT. ASAP
what is the main cause of temperature changes in the atmosphere
Answer:
The main driver of climate change is the greenhouse effect. Some gases in the Earth's atmosphere
An object is traveling at a constant velocity of 8 m/s when it experiences a constant acceleration of 3.5 m/s2 for a time of 40 s. What will its velocity be after that acceleration?
Answer:566.3
Explanation:
Please represent 80 N, East in a diagram
This means a lot to me if u answer
Thank you
Answer: Sorry girl, ik the answer but id.k how to upload the diagram
Explanation:
How do interaction forces act on different masses and on different objects?
Dosen't make sense
Explanation:
TRUE - Two colliding objects will exert equal forces upon each other. If the objects have different masses, then these equal forces will produce different accelerations. ... FALSE - In any collision, the colliding objects exert equal and opposite forces upon each other as the result of the collision interaction.
If an astronaut pushes on a box in space, how many forces are involved in this interaction?
A. One
B. Two
C. Three
D. Four
Answer: B. two
Explanation:
There are two forces resulting from this interaction - a force on the chair and a force on your body. These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction.
However, In the absence of any forces, no force is required to keep an object moving.
This seems like a simple question, but if you wanted to get technical it would in fact be two forces. As there is still a miniscule amount of gravity.
10 Psychological Tricks That Can Make Your Life Much Easier
1. Look into someone’s eyes when you get a dissatisfactory answer: Sometimes we don’t like the answer to a question that we receive and sometimes we don’t understand it. Instead of repeating the question or asking another, look into the eyes of the person. This will make the person feel under pressure or cornered, and this will force them to further elaborate their thoughts.
2. Stay calm when someone raises their voice to you: Make a strong effort to remain calm. When a loudmouth acts out it’s usually in anger, and our behaviors can sometimes unintentionally provoke that. The feelings of anger usually quickly subside and guilt will set in and usually this person is first to ask for forgiveness.
3. Sit close to the aggressor to avoid attack: If you’re heading into a meeting and you know you’ll be in the room with an aggressive person, you know the discussion may become heated, or you may be subjected to negative criticism, make a point to sit next to that person. You may feel uncomfortable and awkward, but you won’t be the only one. Close proximity is known to make people uncomfortable which will lessen the level of aggression they plan to exercise.
4. Remember everyone’s names if you want to be popular: If you want to be popular with your peers and colleagues, make it a habit to start calling people by their first names when speaking with them. A person feels instantaneously special when you call him or her by their first name.
5. Write down your thoughts when you feel stressed or anxious: We all feel some level of mental stress or anxiety at some point. Write down your thoughts in a journal and then close it up. Believe it or not, you’ll be able to focus on your work more easily because you have now shared your thoughts with someone. When you share them, you will then feel the burden on your mind reduced.
6. Give yourself fewer choices when you can’t make the decision:Some people believe that it’s better to have more choices and more information and actually, they prefer to have more. However, it is actually paralyzing to have too many. There is evidence that shows that having four options at a time is the maximum number we can consider and still make a choice. In order to be an effective decision maker, you should only give yourself a few options at a time. This will allow you time to consider each one while giving you enough space between looking at a new set of options.
7. Right posture can boost confidence: This psychological trick applies to both work and pleasure. It can drastically improve your dating life and help you move up the ladder at work. How can you become confident do you ask? The best way to do this is through your posture. If you allow yourself to take up more space, you’re more likely to feel more confident. This is referred to power language.
8. Surefire way to win in ‘rock, paper, scissors’: This one is definitely intriguing. When you’re about to play this famous game, ask your opponent a random question right before. This typically will throw your confused opponent off and more often than not they will throw up ‘scissors’.
9. Make people feel needed when you ask for help: If you need someone’s help start off with the phrase, ‘I need your help…’ People like to feel needed and they hate feeling guilty. By starting off the conversation with that phrase, you’re more likely to receive the help you need.
10. Warm your hands before shaking hands with others:Did you know that cold hands are linked to distrust? When you’re about to touch someone or shake their hand, make sure that your hands are warm. Warm hands promote a friendly atmosphere.
and those are the ten physiology tricks.
Answer: Cool! Thanks!
Why is air pressure lower on top of the airplane wing?
Answer:
Explanation:
Airplane wings are shaped to make air move faster over the top of the wing. When air moves faster, the pressure of the air decreases. So the pressure on the top of the wing is less than the pressure on the bottom of the wing.
this is off the internet
hope this help:)