A block of mass 3/5 kg is placed on a ramp whose incline angle 8 satisfies
cos = 5/6 and sin 8 = 5/9
The coefficient of static friction (us) and the coefficient of kinetic friction (uk) between the block and
the surface of the ramp are
Hs = 4/5 and Hk = 2/5
What is the magnitude of the force of friction acting on the block?
(Use g = 10 m/s².)
O 10/3 N
O2N
04 N
8/3 N
4/3 N
05 N
Answer:
Explanation:
Answer:
Explanation:
Messages are sent through a variety of
Answer:
Messages are sent through a variety of : Messages
A student standing on top of a 170-m high building threw a stone upward with an initial velocity of 50 m/s. What is the vertical location of the stone in meters, with respect to the top of the building, after 10.0 seconds? (hint: pay attention to the sign here!)
The vertical location of the stone in meters, with respect to the top of the building is 10 m
We'll begin by obtaining the velocity of the stone after 10 s. This is can be obtained as follow:
Initial velocity (u) = 50 m/sTime (t) = 10 sAcceleration due to gravity (g) = 9.8 m/s²Final velocity (v) =?v = u - gt (Since the stone is going against gravity)
v = 50 - (9.8 × 10)
v = 50 - 98
v = -48 m/s
How to determine the location (i.e height)Now, we can obtain the location (i.e height) of the stone as follow:
Initial velocity (u) = 50 m/sFinal velocity (v) = -48 m/s Acceleration due to gravity (g) = 9.8 m/s²Height (h) =?v² = u² - 2gh (since the ball is going against gravity)
(-48)² = 50² - (2 × 9.8 × h)
2304 = 2500 - 19.6h
Collect like terms
2304 - 2500 = -19.6h
-196 = -19.6h
Divide both side by -19.6
h = -196 / -19.6
h = 10 m
Thus, the stone is 10 m high from the top of the building
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A child pushes a shopping cart at a constant, average velocity of 2.8 m/s. How long will it
take this child to push the cart 13.2 m down the aisle?
The amount of time required for the child to push the cart around 13.2 m down the aisle is 4.71 seconds.
As we know the average velocity is the rate of change of position or displacement with respect to the time taken during which the changes in displacement were occurring .
Since we know that velocity = distance/time, out from which we can say that,
time = distance / velocity
As we are provided with velocity v = 2.8 m/s and distance d =13.2
so , time taken = d/v
= 13.2/ 2.8
= 4.71428571429
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Can anyone help with questions 2? :)
What was the arms race?
A. Competition to gain allies in Europe and Asia as quickly as possible
B. Competition to build more increasingly powerful weapons
C. Race to be the first nation into outer space
How is the vector arrow representing an acceleration of magnitude 3 m/s2 different from the vector arrow representing a negative acceleration of magnitude 3 m/s2?
Question 11 options:
They point in opposite directions.
They are perpendicular, forming a 270° angle between each other.
They are perpendicular, forming a 90° angle between each other.
They point in the same direction.
The vector arrow representing an acceleration of magnitude 3 m/s² and different from vector arrow representing a negative acceleration of magnitude 3 m/s² so they are perpendicular forming a 90-degree angle between each other. Hence, option C is correct.
What is a Vector?A vector has both magnitude and direction. It is frequently depicted as an arrow with a length proportionate to the magnitude and a direction matching the magnitude of the quantity. A vector lacks position, but possesses magnitude and direction. In other words, if a vector is shifted parallel to itself, its shape remains unchanged as long as its length remains constant.
According to the question,
The acceleration of magnitude 3 m/s² and different form the vector arrow representing a negative acceleration of magnitude 3 m/s².
Hence, they are perpendicular, forming a 90-degree angle between each other.
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Solve for h in PE = mgh.
Why does the speed of an object thrown straight up into the air begin to decrease after it is thrown?
Because gravity pulls it towards the ground and makes the distance it can cover in one second decrease. Or you can say Due to symmetry in the motion.
Hope this helps, please give me brainliest if I'm correct. :)
The speed of an object in the air begins to decrease after it is thrown because the force of gravity makes it accelerate in a downward direction.
What is a Gravitational Force?There are a lot of pushes and pulls in the cosmos. Even if it's just the ground, we are constantly pulling or pushing something. The strong force, the weak force, the electromagnetic force, and the gravitational force are the only truly fundamental forces in physics from which everything else is generated.
Any pair of mass-containing objects will gravitationally pull toward one another. The gravitational force is referred to as attractive because it continually tries to pull masses together rather than push them apart. In truth, you and everything else in the universe is being pulled in different directions. It is known as Newton's Universal Law of Gravitation.
So, when the object is thrown straight up into the air with its initial speed gravity starts acting due to which its speed will slow down after some time, and then it will come back down on the surface.
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do I need licenses or any type of thing to hunt pigeons
Answer:
They can be hunted, captured, and taken anytime in the United States without a permit.
Explanation:
Pigeons are not considered game birds.
travels at
a speed of 80 m/s. It has an estimated mass of 480,000.0 kg. What is the maximum
KE of this train ?
Answer:
KE= 1,536,000,000 Joules
Explanation:
The equation to find Kinetic Energy (KE) is
[tex]KE=\frac{1}{2}mv^{2} \\[/tex]
You are given
m=480,000.0 kg
v= 80 m/s
Substitute the values into the equation and solve for KE
[tex]KE= \frac{1}{2}* 480000*80^{2}[/tex]
KE= 1,536,000,000 Joules
Which type of friction occurs when two objects slide past each other?
O fluid
O normal
O rolling
O sliding
4. Three masses are connected by a light string that passes over a
frictionless pulley as shown. (a) What is the acceleration of the .
system? (b) What are the tensions in the strings?
m.
Three objects are connected by light threads. The object weighing 5.00 kg and the object weighing 4.00 kg are connected by a string.
What distinguishes strings from acceleration?acceleration: the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. The pulling force transmitted axially by a string, cable, chain, or other similar one-dimensional continuous object, or by each end of a rod, or another similar three-dimensional object, is referred to as tension. The action-reaction pair of forces acting at the ends of the aforementioned elements can also be used to describe tension.
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A
bultet
is fired from a gun
with a horizontal velocity of 20 msl.
From a height of 120m Calc the speed
at which the buttet will touch the ground.
Lbane 9 = 10 ms. 2]
The correct answer is 97.8 m.
The speed of an object is the rate at which it travels from one place to another in a set period of time. Since it only describes the amplitude of an object's motion and not its direction, it is a scalar quantity. The S.I. unit of speed is m/s.
Initial horizontal velocity u = 20 ms^-1
height, y = 120m
To cover 120m time taken be t sec,
now taking, g = 10 m/s^2
y = 1/2 g t^2
t^2 = 2y / g
t^2 = (2 × 120) / 10
t^2 = 240 / 10
t^2 = 24 s
t = √24
t = 4.89 sec
In 1 sec distance covered is,
x = ut
x = 20 × 4.89
x = 97.8 m
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in object in motion tend to stay in motion in object in rest tends to stay in rest. "many years before newton wrote this law,__________stated the same idea as the principal of _______.
Many years before newton wrote this law, of motion stated the same idea as the principal of inertia.
What is Newton's first law of motion?
Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Newton's first law of motion is also called law of inertia because it depends on mass of the object.
Thus, many years before newton wrote this law, of motion stated the same idea as the principal of inertia.
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Just question 6 for this page. Tysm
6,240,000,000,000,000,000 electrons
Three boxes, A, B, and C, are placed on a frictionless surface as shown in the diagram below. If you push on box A with a force of 8.25 N, find the contact force (in N) between each pair of boxes. Here mA = 6.25 kg, mB = 3.25 kg, and mC = 1.50 kg. contact force between A and B N contact force between B and C N
The contact force (in N) between each pair of boxes is mathematically given as
F_{ab} = 3.56 N
F_{bc} = 1.2 N
What is the contact force (in N) between each pair of boxes.?Generally, Any force that is generated as a consequence of two objects coming into touch with one another is referred to as a contact force. Contact forces are present everywhere and are the cause of the vast majority of macroscopic groupings of matter's obvious interactions with one another.
In conclusion, The equation for is Acceleration of the system is mathematically given as
a = 8.25 / (5.85 + 2.95 + 1.50)
a= 0.8 m/s^2
Therefore
F_{ab} = (Mb + Mc)*a
F_{ab} = (2.95 + 1.50) * 0.8
F_{ab} = 3.56 N
F_{bc} = Mc * a
F_{bc}= 1.5 * 0.8
F_{bc} = 1.2 N
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28). A block weighs 90N and 80N respectively in air and in water. What will be the weight of the block in a brine of density 1.2g/cm?
Answer:
Buoyant force = g M / V * V = g d V where d is the mass / volume (density)
Fw = g * Vw * dw buoyant force of water on block (10 N)
Fbr = g * Vw * dbr buoyant force of brine on block
Fbr / Fw = 1.2 buoyant force of brine is 1.2 times that of water
Buoyant force of brine = 10 * 1.2 N = 12 N
Thus, the block will weight 90 - 12 = 78 N submersed in brine
In an experiment a student adds baking soda to vinegar and observes that a large amount of gaseous carbon dioxide is released what is the scientific reason for this change
The scientific reason for the change is that baking soda underwent a chemical change to evolve a gaseous carbon dioxide.
What is a chemical change?A chemical change is any process in which reactants are changed into products by the breaking or creation of chemical bonds.
In a chemical change, the chemical bonds in the reactants are broken and rearranged to form new substances called products. One of the evidences that a chemical change has occurred is gas evolution.
According to this question, a student adds baking soda to vinegar and observes that a large amount of gaseous carbon dioxide is released.
Therefore, it can be said that the scientific reason for the change is that baking soda underwent a chemical change to evolve a gaseous carbon dioxide.
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What type of heat transfer is melting ice in your hand
Answer:
Convection!
Explanation:
This is convection because, when the air touches the ice cube it gets cooler, moves up, and drags in the fresh air to be cooled down once again. This cycle continues until the whole ice cube had been melted!
1. An object falls from the St. Louis Gateway Arch and hits the ground in 6 seconds.
The arch is 630 feet tall. Calculate the average speed of the falling object.
Answer:
H = Vav t
Vav = 630 ft / 6 sec = 105 ft/s
Check:
H = Vav * t = 105 ft/sec * 6 sec = 630 ft
if you dont see a number infront of an element (ex.H) (hydrogen) what do i do?
Elements that are written without numbers in front indicate that the are monoatomic.
What are elements?Elements are substances which cannot be split into simpler units by ordinary chemical reactions.
The elements are arranges into a table known as the Periodic Table.
The periodic table arranges elements into 7 horizontal periods and 18 vertical groups.
Elements are usually represented with symbols.
Elements that exists as monoatomic substances such as the metals are written with no number in front. These elements are usually metals and noble gases.
For example;
sodium, Na
Magnesium, Mg
Neon, Ne
Argon, Ar.
Elements that exist as diatomic or polyatomic elements are written with number in subscripts in front of them. These elements are usually non-metallic elements that exists as molecules.
For example;
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When a projectile is released, why is there a change in speed in one dimension but not the other?
Answer choices
A. There can be only one force acting on an object at a time
B. A projectile only moves in one dimension.
C. A projectile only moves in two dimensions because it is thrown.
D. The force of gravity only acts in a downward direction
The change in the speed of a projectile is because the force of gravity only acts in a downward direction.
What is a projectile motion?A projectile motion is a type of motion, in which object thrown or projected into the air, is subject to only the acceleration of gravity as the only force.
How many dimension does a projectile move?A projectile motion is a motion that occurs in a plane. Motion in a plane is also referred to as a motion in two dimensions.
The reference point of a projectile motion will be the origin and the two coordinate axes X and Y.
What causes change in speed in one direction of a projectile motion?When an object is thrown upwards, the force of gravity tends to oppose the motion of the object, this causes the speed of the object to decrease and eventually become zero at the maximum height.
As the object begins to descend, the speed starts to increase because force of gravity is acting in the same direction as the object's motion.
Horizontal velocity of a projectile does not change, because force of gravity only acts in a downward direction.
Thus, the change in the speed of a projectile is because the force of gravity only acts in a downward direction.
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Question 4
3 tries left
Malcolm's mother has schizophrenia, as does his cousin. Malcolm fears he has inherited the
"schizophrenic gene" and will develop schizophrenia. Which of the following statements best reflects
current scientific understanding of the role of genetics in the likelihood of Malcolm developing
schizophrenia?
OA. Genetic factors create a predisposition or likelihood-not a certainty-that certain
behaviors or disorders will develop.
OB. Current research suggests that there is a cluster of genes that define whether or not an
individual will develop schizophrenia.
OC. The presence of a supportive father in the home will eliminate the possibility of Malcolm
developing schizophrenia.
OD. Proper nutrition and exercise can prevent the expression of schizophrenic genes.
Submit
Malcolm's mother has schizophrenia, as does his cousin. Malcolm fears he has inherited the "schizophrenic gene" and will develop schizophrenia. Genetic factors create a predisposition or likelihood-not a certainty-that certain behaviors or disorders will develop.
What affects a person with schizophrenia?Schizophrenia is a severe mental illness that causes its victims to perceive reality in peculiar ways. Schizophrenia can result in severely illogical thinking and behavior, incapacitating hallucinations, and delusions that make it difficult to carry out daily chores.
Is schizophrenia curable?Even though there is no known cure for schizophrenia, it is controllable and controlled with medication and behavioral therapy, especially when it is identified and treated early.
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While all states in the United States require veterinarians to graduate from an accredited school, not all require a license to practice veterinary medicine.
A. True
B. False
The given statement is false. All veterinarians require a license to practice medicine.
What is veterinary science?
The study of animals is called veterinary science. In veterinary medicine, the complete care of animals takes place. All the medicine's complete care and protection are given to the animals.
For veterinary science the medical certificates and training required. Proper training and internships are given to the doctors to treat the animals. Without proper treatment it is not possible to treat animals.
Therefore, The given statement is false. All veterinarians require a license to practice medicine.
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if a car is resting at the top of a hill is suddenly pushed and sent rolling down the hill, what is the acceleration of the car if it arrives at the bottom of the hill 7 seconds later doing 35 m/s?
The acceleration of the car if it arrives at the bottom of the hill is a = 0.204 m/s².
Equation :Given data,
time = 7s
speed = 35 m/s
distance = ?
acceleration = ?
To find distance using the formula,
speed = d / t
d = s / t
d = 35 m/s / 7s
d = 5 m
To find acceleration using formula,
d = ut + 1/2at²
So putting the data in this formula we get,
5 = 0 x 7 + 1/2 a 7²
5 = 1/2 a 7²
a = 5 / (1/2 x 49)
a = 5 / 24.5
a = 0.204 m/s²
What means acceleration?Any process where the velocity changes is referred to as acceleration. There are only two ways to accelerate: changing your speed or changing your direction, or changing both. This is because velocity is both a speed and a direction.
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Explain where energy goes once it is used.
Dylan has made two different chemical batteries for a physics project. He is measuring how much voltage the batteries each produce. The first battery produces 3.12 volts, and the second battery produces 2.8 volts. Using the correct number of significant figures, how much greater was the voltage produced by the first battery, compared to the second?
0.3200 volts
0.320 volts
0.32 volts
0.3 volts
The voltage produced by the first battery is 0.32 volt greater when compared to the voltage produced by the second battery
Data obtained from the questionFrom the question given above, the following data were obtained:
Voltage produced by the first battery = 3.12 voltsVoltage produced by the second battery = 2.8 voltsHow great is the voltage of first =?How to determine how great the voltage of the first battery isWe can obtain how great the voltage of the first battery is compared to the voltage if the second battery as follow:
How great is the voltage of first = Volatge of first - voltage of second
How great is the voltage of first = 3.12 - 2.8
How great is the voltage of first = 0.32 volt
Thus, the voltage of the first battery is greater than the voltage of the second battery by 0.32 volt
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11. A wire made of silver has coefficient of linear expansion, 29x10-6/k and length of 10m. A square metal plate made of such silver and side length 10m expands as its temperature changes from 25°C to 78°C. Determine the ratio of the area of the square and length of the metal plate and length at the final temperatures.
By using the coefficient of linear expansion, the increase in the length of the metal plate is by 0.015m and in the area is by 0.3074[tex]m^2[/tex].
The rate of change in length of a metal per degree change in temperature is known as the coefficient of linear expansion.
Given:
Coefficient of linear expansion, α = 29 x [tex]10^-^6[/tex]/k
Length, L1 = 10m
T1 = 25℃
T2 = 78℃
ΔT = 78 – 25 = 53℃
To find:
Change in length (ΔL) and area (ΔA) of metal plate = ?
Formula:
ΔL = α L1 ΔT
ΔA = A1 2 α ΔT
Calculations:
ΔL = 29 x [tex]10^-^6[/tex] x 10 x 53
ΔL = 0.01537m
ΔA = 100 x 2 x 29 x [tex]10^-^6[/tex] x 53
ΔA = 0.3074[tex]m^2[/tex]
A2 = 100.3074[tex]m^2[/tex]
Result:
The increase in the length and area is by 0.015m and 0.3074[tex]m^2[/tex] respectively.
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A ball is dropped from the second floor and falls. What are the signs of the ball's
velocity and acceleration?
A ball is dropped from the second floor and falls then the ball's velocity is positive and acceleration is negative.
Deceleration, sometimes referred to as negative acceleration, is the phenomenon of an object's velocity steadily decreasing over time. Deceleration is merely the reverse of acceleration, to put it simply.It is described as the speed at which an item in motion slows down. The difference between an object's initial velocity and final velocity can be used to calculate deceleration. As the velocity is dropping, the result will be added with a negative sign. The negative acceleration may be calculated using the acceleration formula, however the outcome must have a negative sign.To know more about acceleration visit : https://brainly.com/question/20382454
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