Answer:
When we can get the Kinetic energy from this formula KE= 1/2 M V^2and we can get the potential energy from this formula PE = M g H
we can set that the kinetic energy at the bottom of the fall equals the potential energy at the top so, KE = PE
1/2 MV^2 = M g H
1/2 V^2 = g H
when V is the velocity, g is an acceleration of gravitational force (9.8 m^2/s) and H is the height of the fall (8 m).
∴ v^2 = 2 * 9.8 * 8 = 156.8
∴ v= √156.8 = 12.5 m/s
for an object to be in static equilibrium, the net force must be equal to zero and
Answer:
The normal force must equal the weight.
Explanation:
Hope this helps..
Please help will be marked most brainlist !!!
Which of the following is not a true statement?
Answer:
d
Explanation:
all of the rest are true
1. Define weight
2. How is the weight of an object related to its mass?
3. If an object has a mass of 50 kg, what is its weight?
4. An object is accelerating when it a speeds up b. slows down c changes direction d any of the above
5. Newton's second law of motion relates an object's acceleration to aits mass b. ils velocity c. the net force acting on it d. a and
6. Doubling the net force acting on an object a doubles its acceleration C. cuts its acceleration in half. b. decreases it acceleration d does not affect its acceleration
7. If the mass of an object doubles, its weight a. doubles b. decreases. c. is not affected. d changes by a factor of
8.If you know the mass of an object, you can calculate its weight with the formula a F-m XV b. a = Fim c. F = m X 9.8 m/s22 d. d = v X 9. Which units can be used to express force? a. N b. kg/s2 c. kgm/s2 d. a ando
10. If you push a 20-kilogram mass with a force of 40 N, what will be the object's acceleration? a 40 m/s2 b. 20 m/s2 c. 10 m/s2 d 2 m/s2
1. Weight is the gravitational pull with which the earth attracts the body towards the center of the earth. The S.I unit is Newton (N)
2. The weight of an object is related to its mass with the below equation.
W = mg
Where W = weight, m = mass and g = acceleration due to gravity
3. The mass m = 50 kg and g = 9.8 m/[tex]s^{2}[/tex]
Substitute the parameters in the equation above.
W = 50 x 9.8
W = 490 N
4. An object is accelerating when it speeds up. If the object slows down, it means it is decelerating. The correct answer is option A
5. Newton's second law of motion is:
F = ma
Where F = force applied, m = mass and a = acceleration
Therefore, Newton's second law of motion relates an object's acceleration to its net force acting on it. The correct answer is option C
6. According to Newton's second law of motion which relates an object's acceleration to its mass, doubling the net force acting on an object a doubles its acceleration. Because mass is always constant.
7. Since the weight of an object is related to its mass with the equation.
W = mg, If the mass of an object doubles, its weight will also doubles. Option A is the correct answer.
8. If you know the mass of an object, you can calculate its weight with the formula F = mX when X = 9.8m/[tex]s^{2}[/tex]
9. Force is expressed in unit as Newton (N)
10. The parameters given are :
mass m = 20kg
Force F = 40N
To calculate acceleration, use the formula F = ma
Substitute all the parameters into the equation.
40 = 20a
a = 40/20
a = 2m/[tex]s^{2}[/tex]
The correct option is D
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The two characterists of stars shown on an H-R diragram are absolute brightness
and
Surface temperature im quite certain
2
Which graph represents the motion of a car that is travelling along a straight road with a uniformly
increasing speed?
A
B.
С
D
o acceleration
acceleration
o displacement
o displacement
Tannie
tume
Answer:
I know someone that has the answer
Explanation:
A
How many electrons have been removed from a positively charged electroscope if it has a net charge of 6x10-11?
answer and explain if u can pls :)
Answer:
is it the ans you are looking for
to digitize sound, a process called _____ is used to measure the amplitude of a sound wave thousands of times per second.
Answer: Sound recording and production
Explanation: Digital audio is also the name for the entire technology of sound recording and reproduction using audio signals that have been encoded in digital form.
Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. Each step is of uniform height . The mass of each object is a multiple of the base mass : object 1 has mass 3.10 , object 2 has mass 1.46 , and object 3 has mass . When the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. If the objects are then relocated as shown, what is the new total potential energy of the system? Each answer requires the numerical coefficient to an algebraic expression. Each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. Enter only the numerical coefficient. (Example: If the answer is 1.23 ,
The definition of gravitational potential energy would gravitate allows to find the answers for the energy of each object on the highest rung of the ladder are:
a) expression for gravitational potential energy is [tex]U_p = m g \ \Delta y[/tex]
b) Energy value
* Body 1 U_p = 82 J
* Body 2 U_p = 38.6 J
* Body 3 18.5 J
The gravitational potential energy is a configuration energy that represents the amount of work that the system can do for a given configuration, its expression is
[tex]U_p = m g \ \Delta y[/tex]
Where [tex]U_p[/tex] is the gravitational potential energy, m the mass of the body and Δy the difference in height.
In this case it indicates that the minimum height is at the bottom and is equal to zero, the steps of a ladder have a height of approximately y = 15 cm = 0.15 m
They indicate the mass of the bodies are m₁ = 3.10 kg, the mass of the body 2 m₂ = 1.46 kg , the mass of the third object is not observed, suppose it is m₃ = 0.7 kg.
They indicate that the body is placed on the last step, suppose it is a standard 18-step ladder, therefore the total height is
y = # _ steps y_each step
y = 18 0.15
y = 2.70 m
the gravitational potential energy to the capacity of the body is
body 1
[tex]U_p[/tex] = m₁ g Δy₁
U_p = 3.10 9.8 (2.70 -0)
U_p = 82 J
body 2
U_p = 1.46 9.8 ( 2.7-0)
U_p = 38.6 J
body 3
U_pUp = 0.70 9.8 (2.7-0)
U_p = 18.5 J
In conclusion, using the definition of gravitational potential energy, we can find the answers for the energy of each object on the highest rung of the ladder are;
a) expression for gravitational potential energy is [tex]U_p = m g \ \Delta y[/tex]
b) Energy value
* Body 1 U_p = 82.0 J
* Body 2 U_p = 38.6 J
* Body 3 U_p = 18.5 J
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Which is likely TRUE of an individual whose body composition has little fat and is naturally lean?
OPTIONS:
A.
They have a high metabolism.
B.
They have a family history of obesity.
C.
They require less food than most people.
D.
Their body composition will never change.
Answer:
A
Explanation:
If an individual whose body composition has little fat and is naturally lean then they have a high metabolism, therefore the correct answer is option A.
What is exercise?The advantages of working out vary depending on the type of death a person experiences. Even if a person exercises, excessive sitting can cause a number of illnesses, many of which are fatal. The individual might also engage in mobile activities, in addition, to exercise to improve their fitness.
Any activity that involves bodily motions that increases a person's health, fitness, and well-being while reducing their chance of developing illnesses is considered exercise. It makes it possible for the person to maintain a healthy weight.
Therefore, if an individual whose body composition has little fat and is naturally lean then they have a high metabolism, therefore the correct answer is option A.
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I NEED HELP I AM SO CONFUSED, WILL GIVE BRAIN.
A man is on a 30m cliff and throws a ball down with a speed of 7 m/s.
A) With what velocity does the ball hit the ground? B) How high above the ground is the ball after the ball has fallen for 1 second?
Answer:
210
Explanation:
A ball rolls horizontally off the cliff at a speed of 30 m/s. It takes 7 seconds for the ball to hit the ground. What is the height of the cliff and the horizontal distance traveled by the ball?
S = (1/2)*9.8 m/s^2 * 7^2 = 240.1 m if the ball is very dense so air resistance, and therefore terminal velocity, can be ignored.
S = v * t = 30 m/s * 7 s = 210 m for the horizontal distance, again assuming negligible air resistance.
Height above the ground is the ball after the ball has fallen for 1 second is 210 m.
What is speed?The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.
A ball rolls horizontally off the cliff at a speed of 30 m/s. It takes 7 seconds for the ball to hit the ground.
S = (1/2)*9.8 m/s² * 7² = 240.1 m if the ball is very dense so air resistance, and therefore terminal velocity, can be ignored.
S = v * t = 30 m/s * 7 s = 210 m for the horizontal distance, again assuming negligible air resistance.
Height above the ground is the ball after the ball has fallen for 1 second is 210 m.
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The table describes the properties of four compounds.
Which compounds are most likely ionic?
compounds A and B
compounds B and C
compounds C and D
compounds D and A
The characteristics of the ionic bonds allows to find the results for the question about which compound are ionic is:
d) Compounds D and A.
Chemical compounds are formed by atoms linked by electrostatic forces, where one of the elements gave up some electrons and the other element acquired these electrons, the two atoms being in an ionic state, consequently the bond is strong and has several characteristics:
High melting point. It dissolves in polar solvent (water). In general they are hard and brittle solids (NaCl). In solution they are conductors of electricity.
In these characteristics, let's analyze the compounds in the table.
With the property of high melting point the compounds A and D can be ionic. According to the dissolution property all could be ionic. According to the conduction property of electricity, compounds A and D can be ionic
Let's review the different alternatives:
a) False. Compound A and B has a low melting point.
b) False. The B and C compounds have low melting points.
c) False. Compound C has a low melting point.
d) True. The two compounds meet all the characteristics of ionic compounds.
In conclusion with the characteristics of the ionic bonds we can find the results for the question about which compound are ionic is:
d) Compounds D and A are ionics.
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PLEASE HELP ASAP THANK YOU You're out for run. Your initial velocity is 1.5 m/s. Suddenly a crazy dog starts chasing you and you
accelerate to a velocity of 3 m/s. It takes you 10 seconds to find a safe place to hide from the
Chihuahua. What was your displacement?
Show work
Answer:
Your displacement would be
s = 22.5 m
s=1/2(v+u)t
Newton’s First Law Scenarios
Taking off from an Aircraft Carrier
The airplane accelerates from 0 to 200 mph in 1.5 seconds. Why are rear-facing passengers' feet tied down? What do their eyes feel like?
Car Accident—Car versus Tree
What happens to the driver's body when his car hits the tree at a high speed?
Car Accident: Rear-end collision
What will happen to the stationary driver who is rear-ended? What device protects him?
Football: Helmet-to-Helmet Collision
What happens to the players' brains inside their skulls?
Roller Coaster Ride
Why does your stomach feel so funny when you go down the big hill?
Why do you feel like you will fly out of your seat at the top of a hill when you are going fast?
Teacups at Disneyland
Why do the riders feel squished together if the teacups spin too fast?
Answer:Newton’s First Law Scenarios
Taking off from an Aircraft Carrier
The airplane accelerates from 0 to 200 mph in 1.5 seconds. Why are rear-facing passengers' feet tied down? What do their eyes feel like?
Because of the speed of the aircraft and how fast its moving
Car Accident—Car versus Tree
What happens to the driver's body when his car hits the tree at a high speed?
Your body will get slammed forward and into the airbag
Car Accident: Rear-end collision
What will happen to the stationary driver who is rear-ended? What device protects him?
His head will be forced forward that's why they have a airbag and headrests
Football: Helmet-to-Helmet Collision
What happens to the players' brains inside their skulls?
It rattles and thats whats creates a concussion
Roller Coaster Ride
Why does your stomach feel so funny when you go down the big hill?
Because your stomach rises because of the sudden dip
Why do you feel like you will fly out of your seat at the top of a hill when you are going fast?
Because the car has more down force
Teacups at Disneyland
Why do the riders feel squished together if the teacups spin too fast?
Because they are pushed to the outside
Explanation:Newton’s First Law Scenarios
Taking off from an Aircraft Carrier
The airplane accelerates from 0 to 200 mph in 1.5 seconds. Why are rear-facing passengers' feet tied down? What do their eyes feel like?
Because of the speed of the aircraft and how fast its moving
Car Accident—Car versus Tree
What happens to the driver's body when his car hits the tree at a high speed?
Your body will get slammed forward and into the airbag
Car Accident: Rear-end collision
What will happen to the stationary driver who is rear-ended? What device protects him?
His head will be forced forward that's why they have a airbag and headrests
Football: Helmet-to-Helmet Collision
What happens to the players' brains inside their skulls?
It rattles and thats whats creates a concussion
Roller Coaster Ride
Why does your stomach feel so funny when you go down the big hill?
Because your stomach rises because of the sudden dip
Why do you feel like you will fly out of your seat at the top of a hill when you are going fast?
Because the car has more down force
Teacups at Disneyland
Why do the riders feel squished together if the teacups spin too fast?
Because they are pushed to the outside
ocean acidification impacts corals in what major way?
Clyde takes a flight from Bellingham to Seattle, which is a distance of 90-miles,
at a constant speed of 180-mi/hr. He then rents a car and drives to a friend's house in Mt.
Vernon at 60-mi/hr. Mt Vernon is 30-miles from Bellingham.
What is trip distance?
A car accelerates from 4 meters/second to 16 meters/second in 4 seconds. The car’s acceleration is meters/second2.
Answer:
3m/s^2
Explanation:
VF-VI/time
16-4/4
12/4
3
This equation tells the position of the ball, x, at any time t. Let's use it to solve for the position of the ball at t=0.00231 s. What value do you get when you use t=0.00231 s and solve for the position, x?
The slope of the graph, A, and the starting position of the ball, B, can be used to determine the position of the ball
The position of the ball at time t = 0.00231 s is 59.933 cmReason:
Question; The possible function representing the given equation is presented as follows;
x = A·t + B
Where;
A = 2.59 × 10⁴ [tex]\frac{cm}{s}[/tex]
B = 0.104 cm
t = Time in seconds (s)
x = The position (cm)
Required: The value of the position when t = 0.00231 s
Solution:
The position time graph of an object moving with a constant speed is a straight line with an equation of the form y = m·x + c
Plugging in the value of t = 0.00231 in the given equation gives;
x = 2.59 × 10⁴ × 0.00231 + 0.104 = 59.933
The position x of the ball at time, t = 0.00231 s is 59.933 cm
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Are you an antisocial person. Me honestly am
Explanation:
By the way.. What's the meaning of ANTISOCIAL??..(ㆁωㆁ)
If you tell me the meaning of it, I'll tell you my answer too(ㆁωㆁ)
Describe how acceleration happens in the context of a collision.
Plz help<3
Answer:
(Hope this helps can I pls have brainlist (crown)☺️)
Explanation:
In a collision, both objects are subjected to a force that causes them to accelerate. Despite the fact that the forces are equal in magnitude and direction, the least massive item experiences the highest acceleration. When two objects of identical mass collide, they both experience the same acceleration.
A collision is a brief encounter between two or more bodies that results in a change in motion of the bodies involved as a result of internal forces acting between them. Forces are involved in collisions (there is a change in velocity ).
Lorenzo pushes on a heavy crate with an applied force of 250 N at an angle of 30° below the horizontal. The force of friction opposing the applied force is 95 N. If the mass of the crate is 45 kg, what is the acceleration of the crate?
A. 0.67 m/s2 forward
B. 1.7 m/s2 forward
C. 2.7 m/s2 forward
D. 3.4 m/s2 forward
Also here are some pictures of Shoya Ishida to make your day better:3
Answer:
A. 0.67 m/s² forward
Explanation:
F applied = 250 N
Fsin30 = 250/2 = 125N
F friction= 95 N
Fnet = F app - F fri
= 125-95
= 30 N ( forward)
Fnet = m a
30 = 45 a
a= 30/45
=2/3
= 0.67 m/s² (forward)
plz help me guys thank you
URGENT: true or false: liquids can be poured from one container to another because there are no attraction forces between atoms or molecules
Answer:
False
Explanation:
It's common sense
Answer:
True
Explanation:
Water doesnot have any definite shape.There is less attraction between particles .Hence water can move one container to anotherWhat needs to be applied in order to change an object's momentum?
a. kinetic energy
b. impulse force
c. a new velocity
d. it’s mass
Answer:
B
Explanation:
if you want to change an object's momentum you need to apply force to the object
If the distance around a circular track is 2.0km and if runners run 3 laps, what is the distance travelled?
a) 2 km
b) 0km
c) 3 km
d) 6 km
Answer:
d=6km
Explanation:
because multiply 2x3 is six
uses of concave and convex mirror
hello?
Explanation:
→ Uses of Convex Mirror
• Convex mirrors are often used in the hallways of buildings including stores, schools, hospitals, hotels and apartment buildings.
• They are used in driveways, roads, and alleys to provide safety to all the bikers and motorists at curves and turns and other places where there is a lack of visibility.
• They are also used in some automated teller machines as a handy security feature that allow user to see what all is happening behind them.
• They are used in passenger side mirror on a car and somewhere it is labelled as “objects in mirror are closer than they appear” to warn the driver.
→ Uses of concave mirror :
• Head mirrors
• Shaving mirrors
• Headlights
• Ophthalmoscope (optical instrument)
• Solar furnaces
• Astronomical telescopes
Why is water not used as a liquid in glass thermometers?
Explanation:
Because water has no uniform rate of expansion and it vaporizes easy when temperature increases that makes it difficult to read.
what produces pressure in a liquid
Answer:
1. The weight of the column of water above
2. Due to Gravity
(I would say there are two answers for this question)
Explanation:
1.
The pressure in a liquid is due to the weight of the column of water above. Since the particles in a liquid are tightly packed, this pressure acts in all directions. For example, the pressure acting on a dam at the bottom of a reservoir is greater than the pressure acting near the top.
2.
Fluid pressure can be caused by gravity, acceleration, or forces in a closed container. Since a fluid has no definite shape, its pressure applies in all directions. Fluid pressure can also be amplified through hydraulic mechanisms and changes with the velocity of the fluid.
A person travels 350 km at an average speed of 60 km/hr. How long did it take?
Answer: 5.8 hours
Explanation:
Time= distance divided by speed, so:
350 divided by 60= 5.8 hours
Muscles in a kangaroo's legs work because of the cells that make up the muscle. Which
does this best illustrate?
All living things are made of cells.
Cells are the basic unit of structure and function of all living things,
All cells come from other cells.
Cells are generated from nonliving materials.
Answer:
all living things are made of cells
Explanation:
cells are kinda like matter but only for living thing like when someone says you white blood cell count is low its because they are part of you living body.
PLEASE ANSWER ASAP! <33 When the computer you are working on uses energy it also produces waste energy. What type of energy is this waste energy?
Chemical Energy
Thermal Energy
Answer:
thermal energy
Explanation:
computer produce thermal energy later brought out by exhaust fans...
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