Answer:
I think it is c
Explanation:
which is an example of a screw?
Answer:
The answer is C.
Explanation:
Although a staircase isn't what you would typically think of when you think of a screw, it does fall under the screw category.
Hope that helps!
Answer:
B
Explanation:
B
1.Practicing regularly & focusing on specific skills you want to improve is regularity & specificity.
True
False
2. Gradually adding to the number of exercises you preform to prevent injury is the principal of regularity & specificity
True
False
WILL GIVE U BRAINLIEST
A falling skydiver is accelerating in the downward direction at 3.29 m/s^2. The mass of the skydiver (including parachute gear) is 67.2 kg. Determine the air resistance force on the skydiver (and accompanying parachute).
Answer:
The force due to air resistance on the skydiver is 438.1 N.
Explanation:
You need to balance forces. If we use the following notation:
Net force on skydiver = F
Force on skydiver due to gravity = F(grav)
Force on skydiver due to friction or air resistance = F(air)
Then:
F = F(grav) - F(air)
because the force of air resistance acts against the force from gravity. You can rearrange this to get:
F(air) = F(grav) - F
Then you can use the equation F = ma to get:
F(air) = ma(grav) - ma
where:
m = mass of skydiver (given in question) = 67.2kg
a(grav) = acceleration of an object due to gravity = g = 9.81 m/s/s on Earth
a = actual acceleration (given to you in question) = 3.29 m/s/s
Simplify the equation to get:
F(air) = m * [g - a]
F(air) = 67.2 * [9.81 - 3.29]
F(air) = 67.2 * [6.52]
F(air) = 438.1 N
When the parachute is opened, the surface area increases, which increases air resistance.
The force due to air resistance on the skydiver is 438.1 N.
What happens to air resistance when a parachute opens?When the parachute is opened, the surface area increases, which increases air resistance. Because air resistance has surpassed weight, the resulting force acts upwards. The parachutist slows down; a lower velocity means less air resistance. At a lower terminal velocity, air resistance and weight become equal.However, the faster the parachute falls, the more drag it creates. The drag force resists gravity's downward movement, pushing the parachute back up. The drag of the parachute increases as it falls until it just balances out the pull of gravity.Net force on skydiver = F
Force on skydiver due to gravity = F(grav)
Force on skydiver due to air resistance = F(air)
Then:
F = F(grav) - F(air)
because the force of air resistance acts against the force from gravity. You can rearrange this to get:
F(air) = F(grav) - F
Then you can use the equation F = ma to get:
F(air) = ma(grav) - ma
where:
m = mass of skydiver (given in question) = 67.2kg
a(grav) = acceleration of an object due to gravity = g = 9.8m/s^2 .
a = actual acceleration (given to you in question) = 3.29 m/s/s
Simplify the equation to get:
F(air) = m * [g - a]
F(air) = 67.2 * [9.81 - 3.29]
F(air) = 67.2 * [6.52]
F(air) = 438.1 N.
To learn more about : Air resistance
Ref : https://brainly.com/question/14877316
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A person fires a gun standing at a distance of 55 m from a wall. If the speed of sound is 330 ms-1, find the time for an echo to be heard.
pls tell the answer it is urgent
Answer:
557$-$-%-%-*$7-3*$*2*2663*363737
Answer:divide 55 and 330 to find the answer.
Explanation:
Sam was was driving his car to New York
The distance from his place to NY is 30km
It took him 60 Minutes to go there
What was Sarah Doing?
Answer:
Explanation:
driving
!!ANSWER FOR BRAINLIEST!!
Which of the following materials would not be a good insulator?
a. wood
b. cloth
c. metal
d. rubber
Answer:
Wood and Cloth
Explanation:
(misread it the first time so I'm here to fix it) bur wood would burn and the same for cloth. Metal and rubber keep in electricity
giving out brain but don't beg because i will choose if the answer was right.
Two dogs are pushing against a box of dog treats from opposite sides. Dog 1 is pushing with 10 newtons of force to the right, and dog 2 is pushing with 15 newtons of force to the left. what is being applied to the box of dog treats?
A. 5 N to the left
B. 25 N to the left
B. 150 N to the left
Answer:
Answer choice B. 25 N to the left i think?
Explanation:
i am the halogen located in the second period of the periodic table.who am i
Answer:
Fluorine
Explanation:
Halogens is the group right before Noble Gases, or Group 17. They consist of (from Period 1 to 7):
2 - Fluorine
3 - Chlorine
4 - Bromine
5 - Iodine
6 - Astatine
7 - Tennessine
We can see from the Periodic Table of Elements that Fluorine will be our answer.
Answer:
Fluorine
Explanation:
ill give brainliest What will the acceleration of a falling 8 kg object be if it has 7 Newtons of air resistance?
Answer:
Given:
M= 8kg
F= 7N
Unknown:
Acceleration of a falling object
Formula:
a = F/m
Solution and Final Answer:
a = 7 kg.m/s² ÷ 8 kg
a = 0.88 m/s²
because the divisor and dividend there are the same units so cancel it(kg) then the rest is m/s² so it will be the unit of 0.88 will become 0.88 m/s²
If the subject with type 1 diabetes eats a high-carb food such as the candy bar or orange smoothie, then the blood glucose levels will (increase/decrease/stay the same) after a three-hour digestion period.
Answer:
The subjects blood glucose levels will increase after 3 hrs
Explanation:
I had the lab assignment an got a 90
According to the law of conservation of energy, which changes would
decrease the total energy of a system?
A. An addition of 500 J of thermal energy and a loss of 250 J of
thermal energy
O B. An addition of 300 J of kinetic energy and a loss of 250 J of
thermal energy
O C. An addition of 400 J of GPE and a loss of 350 J of thermal energy
O D. An addition of 200 J of thermal energy and a loss of 350 J of
kinetic energy
Answer:
Option D
Explanation:
I hope this helps
Changes that would decrease the total energy of a system an addition of 200 J of thermal energy and a loss of 350 J of kinetic energy.
What is thermal energy?The energy present in a system that determines its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is a whole field of physics that studies how heat is transmitted across various systems and how work is performed in the process.
According to the law of conservation of energy, which changes would
decrease the total energy of a system is an addition of 200 J of thermal energy and a loss of 350 J of kinetic energy.
An addition of 200 J of thermal energy and a loss of 350 J of kinetic energy.
To learn more about thermal energy refer to the link:
brainly.com/question/13552918
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Could somebody help me with this question?
Answer:
50 :)
Explanation:
Jamie did an experiment to find out whether cola, diet cola, or water would freeze quickest. She poured three equal amounts of each liquid into paper cups and put all the paper cups in the same freezer. Then she timed how long it took the liquid in each cup to freeze. What should Jamie do to analyze her data?
A. Find the average time it took each liquid to freeze.
B. Look at her data and estimate the answer.
C. Repeat the experiment two more times.
D. Conduct another experiment with other liquids.
Answer:
It would be C.
Explanation:
To receive the most accurate data, she should repeat the experiment multiple times.
Does anyone know how to change ur name on here?
Answer:
i think you can message brainly support.
Stratus clouds, like the ones shown in the picture, look like large gray blankets hanging low across the sky. When these are present, it will usually ____ if it is warm, and ____ if it is cold.
1. rain, snow
2. snow, drizzle
3. drizzle, be windy
4. be windy, be sunny
If kinetic energy can be transferred to thermal energy, how hard do I have to slap a chicken in order to cook it?
Answer:
Hard enough
Explanation:
lol
please help!!!!!!!!!!!!!!!!!
Answer:
1000=100
x=1
cross multiply
100x =1000
divide both sides by hundred
therefore x=10
so it is 10 meters per minute
You will get brainliest if you answer ASAP and if please please answer correctly!! Please only answer if you know!
Answer:
Acquired traits are not passed down from generation, they are gotten from the person doing things, so that would be:
B. A back injury and D. A short hair cut
Explanation:
kleann
Answer:
B and D
Explanation:
Technically these are not traits. They are subjects that someone has acquired over the period of their life.
I really need help (ill give brainlest)
which part of the helicopter blades spin the fastest?
Answer:
Tail Rotor
Explanation:
Although it is the smallest, it can rotate much faster than the other blades.
Answer:
C (the part of the blade that is halfway between the end and where it connects to the helicopter)
Explanation:
Explain the flow of energy in the food chain and why stored energy is an important part of it.
The energy flow in the ecosystem is important to maintain an ecological balance. The producers synthesis food by the process of photosynthesis. A part of the energy is stored within the plants. The remaining energy is utilized by the plants in their growth and development.
Which of these are functions of the liver? (Select all that apply.)
secretes hydrochloric acid into the stomach to break down food
filters poisons from the blood
secretes bile for fat break down into the gall bladder
stores vitamins, minerals, fats, and ingredients for making glucose
Answer:
Filter poisons from the blood!!! Hope this helped u have a great day :)
Explanation:
In physical weathering, how are ice and plant roots similar?
Both break open rocks by expanding in a crack.
Both cause abrasion and slowly break down rocks.
Both require many cycles of freezing and melting.
Both result from dramatic changes in temperature.
Answer:
A break open rocks from in cracks
Explanation:
Ice freezes in the crack and expands. Plants start growing in the crack and grow out of it. Both of these cause the rock to slowly break in half from the crack.
Hope this helps :)
Find the voltage if the current is .2 A and the resistance is 2 .
Answer:
The voltage is 0.4 v
Explanation:
Given :
I = 0.2 A
R = 2 ohm
so,
=> V = IR
=> V = 0.2×2
=> V = 0.4v
Which of the following is an example of mutualism?
A. Mistletoe lives on trees. It sends special root-like structures into the tree's bark and absorbs food and water. The tree suffers when it cannot produce enough food for itself and the mistletoe.
B. As the sloth moves from shade to light, the algae get the sun they need to produce their food. The green algae color camouflages the tree sloth from predators. They both benefit.
C. A tick obtains food from the blood of its host.
D. Cape buffalos move through the grass and kick up lots of insects. Cattle egrets eat the insects the buffaloes stir up. The egrets benefit and the buffalo is not harmed, nor does it benefit.
SCIENCE! 18 POINTS
Answer:
B
Explanation:
They both benefit
Which of the following properties are unique to electromagnetic waves?
Answer:
C. Crest and Trough.
Explanation:
All the other properties are shared among longitudinal and transverse waves. Transverse waves are the technical term for electromagnetic waves because electromagnetic waves are transverse.
!FIRST TO ANSWER GETS BRAINLIEST!
The energy unit on a food label are
a. degrees
b. calories
c. metal
d. rubber
!!ANSWER QUICKLY!!
Answer:
Calories
Explanation:
mark me brainliest!!
What is a model? (Science)
Answer:
a system or thing used as an example to follow or imitate.
Explanation:
Where are the magnetic field lines closest together, and what does that tell you about the strength of the magnetic field?
Answer:
Magnetic field lines are closest near the poles of a magnet. The closer the magnetic field lines, the stronger the magnetic field is at that point.
Explanation:
I hope this helps!
Why does air rush out of an inflated balloon? ONLY REAL ANSWERS = BRAINLIEST ABSURD, WRONG ANSWER = REPORT
Answer:
When a balloon is inflated we increase the pressure inside the balloon so that the pressure inside the balloon is greater than the pressure outside the balloon. The escaping air in one direction provides the force in the opposite direction for the balloon to go in the opposite direction.
Explanation:
I hope this helps.