Answer:what?????
Explanation:hhisb
1. A lab cart travels at 0.5 m/s for 3.7 m. How long did it take the cart to travel this distance? show steps
Answer:
Time, t = 7.4 secs.
Explanation:
Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.
Mathematically, speed is given by the equation;
[tex]Speed = \frac{distance}{time}[/tex] ....equation 1
[tex]Time = \frac{distance}{speed}[/tex] .....equation 2
Given the following data;
Speed = 0.5m/s
Distance = 3.7m
Substituting into equation 2;
[tex]Time = \frac{3.7}{0.5}[/tex]
Time, t = 7.4 secs.
What theory or hypothesis can you find about gravity?
Answer:
That it will always work on earth.
Explanation:
If it's on earth it will not be able to elude gravity.
That's all i've got sorry
A child appears to be running into the street aheadIt takes 23 seconds for the driver to react and begin to brake, but this time at a rate of - 7.5 m/s ^ 2 . What is the stopping distance for the car in this situation?
Answer:
Explanation:
Given
acceleration a = - 7.5 m/s^2
time t = 23secs
Required
Stopping distance S
First let us get the initial velocity if the child using:
v = u + at
Note that v = 0
0 = u -7.5(23)
u = 7.5 * 23
u =172.5m/s
Using the equation of motion to get the stopping distance:
v² = u²+2aS
0 = u²+2aS
-u² = 2aS
-172.5² = 2(-7.5)S
29,756.25 = 15S
S =29,756.25/15
S = 1,983.75m
Hence the stopping distance is 1,983.75m
carl walks a distance of 100 meters at a speed of 4 m/s. how much time does it take? ( please show step-by-step explanation )
Answer:
25s
Explanation:
To find the amount of seconds it takes, you divide 100 (the meters) by 4 (the meters per second) the meters then cancel out, and you are left with 25 s
A car drives off a cliff at 30 m/s. The car lands 100 meters
from the base of the cliff. How tall is the cliff?
Answer:
Height of the cliff, H = 54.66 m
Explanation:
Given that,
Speed of the car, u = 30 m/s
The car lands 100 m from the base of the cliff.
We need to find the height of the cliff.
First we will find the time time needed for the car to reach the bottom of the cliff. It can be calculated as :
[tex]t=\dfrac{h}{v}\\\\t=\dfrac{100}{30}\\\\t=3.34\ s[/tex]
Let H is the height of the cliff. Using second equation of motion as follows
[tex]H=v_yt+\dfrac{1}{2}gt^2\\\\H=\dfrac{1}{2}gt^2\\\\H=\dfrac{1}{2}\times 9.8\times (3.34)^2\\\\H=54.66\ m[/tex]
So, the cliff is 54.66 m tall.
On the moon, Bob weighs 160N. Fred weighs 882N on Eartch. Who has the greater mass?
Answer:
Fred weighs more than bob
Explanation:
1. Compare and Contrast Elements and Atoms (3 column table)
PLeasee help!!
Answer:
A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons. An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing just one proton and one electron.
Explanation:
convert 72km\hr into SI unit
Answer:
hello we can't convert 72 into s18 because that is another one and another one
Explanation:
0 please Marks as brainleast
erica wants to attend a a public four- year unviersity
Answer:
go girl
Explanation:
i'm feom public uni too
two asteroids crashed. The crash caused both asteroids to change speed. Scientists want to use the change in speed and motion to figure out which asteroid has more mass. Based on the information in the diagram, which statement is correct? In your answer, explain what the forces were like and why the asteroids changed their motion.
Asteroid 1 has more mass than Asteroid 2.
Asteroid 1 and Asteroid 2 are the same mass.
Asteroid 1 has less mass than Asteroid 2.
Answer:
The answer is asteroid 1 has more mass
Explanation:
If the initial speed of both asteroids before the collision is equal, then the asteroid with more mass has more momentum before collision while the asteroid with lesser mass has greater momentum after the collision.
What is law of conservation of linear momentum?According to the principle of conservation of linear momentum, the sum of the momentum before the collision must equal the sum of the momentum after the collision.
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
where m₁ and m₂ is the mass of the objects that collided, u₁ and u₂ is their initial speed and v₁ & v₂ is their final speed.
The linear momentum is the product of the mass of the object times the velocity of that object. Conservation of momentum is a property exhibited by any object where the total amount of momentum never changes.
The principle of conservation of linear momentum states that if two objects collide with each other, then the total momentum before and after the collision will remain the same if there will be no external force acting on the colliding objects.
Therefore, the linear momentum of both asteroids will be conserved as no external force acting on them. The asteroid with more mass has more momentum before collision while the asteroid with lesser mass has greater momentum after the collision so that total momentum remains conserved.
Learn more about the law of conservation of linear momentum, here:
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In the "herd" strategy for immunization, vaccinations are given _____. only to individuals who are most likely to be exposed to a disease only to individuals who travel to countries where certain disease are a threat to a large majority of the population the entire population
Answer:
C. to a large majority of the population.
Explanation:
Immunization can be defined as the process of boosting an individual's immunity or immune system against antigens (immunogen) which cause diseases by the administration of vaccines.
Basically, immunization helps to improve the functions of the antibodies, B cells, T cells etc.
In the "herd" strategy for immunization, vaccinations are given to a large majority of the population in order to protect and prevent the spread of an infectious disease to those who are not immune.
Answer:
to a large majority of the population
Explanation:
mark me as brainest pleasee
Electromagnetic energy travels through space in the form of what
A. electric charges
B. shape
C. waves
D. lower
E. higher
F. chemical
G. electrical
H. nuclear
Answer:
c
Explanation:
electromagnetic energy is transmitted through space in the form of waves.
What is the momentum of a 7.0 kg bowling ball rolling at 2.4 m/s? Express your answer to two significant figures and include the appropriate units
Answer:
16.8 kg m/s is the momentum of a bowling ball
Explanation:
Given:
m = 7kg
v = 2.4 m/s
Unknown:
p or momentum
Formula and Solution:
p = mv
p = 7kg × 2.4m/s
Final Answer:
p = 16.8 kg m/s is the momentum of a bowling ball
How to find momentum?
Momentum, product of the mass of a particle and its velocity. Momentum is a vector quantity. It has both magnitude and direction. Isaac Newton's second law of motion states that the time rate of change of momentum is equal to the force acting on the particle. See Newton's laws of motion. Momentum.
Formula = p = mv or momentum = mass x velocity
Last summer, Jose left early in the morning at 5 a.m. and drove to Ensenada 100 miles away. He stopped to get gas and drove an extra 300 miles. He finally stopped in Cabo San Lucas at 1p.m. What was the average speed that Jose was traveling?
Answer:50 miles per hour
A rock thrown up into the air with an initial speed of 25 m/s . How much time will pass before the rock is moving back down at 6 m/s ?
A rocket is shot out of a navy battleship to test a new rocket. It takes 16 seconds for the rocket
to reach its destination after leaving the barrel. If its final velocity was found to be 200 m/s,
then what was the rocket's acceleration?
In order to get the most benefits from exercise with the least amount of risk, you should
Answer:
always stretch before you exercise
Explanation:
length measures the amount of matter in a substance or an object. true or false ?
Answer:
false
Explanation:
Match the number in this mathematical expression with the number significant digits they have .
18.34cm +9.02603cm -20.2cm +150cm
1. 150cm. a.4
2. 9.02603 cm. b.6
3. 18.34cm. c. 2
4. 20.2cm. d.3
Answer:
Please check your question well. Otherwise I think there's no matching.
A sheet of BCC iron 1.5-mm thick was exposed to a carburizing atmosphere on one side and an carburizing atmosphere on the other side at 725°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces were determined to be 0.012 and 0.0069 wt%. Calculate the diffusion coefficient if the diffusion flux is 3.6 × 10-8 kg/m2-s, given that the densities of carbon and iron are 2.25 and 7.87 g/cm3, respectively.
Answer:
Diffusion coefficient D = 2.6613 × 10⁻¹¹ m²/s
Explanation:
From the given information:
Carbon concentration [tex]C_c[/tex] = 0.012
Iron concentration [tex]C_{Fe}[/tex] = 100 - 0.012 = 99.988
Density of carbon = 2.25 g/cm³
Density of iron = 7.87 g/cm³
We can convert the carbon concentrations from weight percentage to kilograms carbon per meter cubed by using the formula.
[tex]C^*_c = \dfrac{C_c}{\dfrac{C_c}{\rho_c}+\dfrac{C_{Fe}}{\rho_{Fe}}}\times 10^3[/tex]
[tex]C^*_c = \dfrac{0.012}{\dfrac{0.012}{2.25 \ g/cm^3}+\dfrac{99.988}{7.87 \ g/cm^3}}\times 10^3[/tex]
[tex]C^*_c = \dfrac{0.012}{0.00533 \ g/cm^3 + 12.71 \ g/cm^3} \times 10^3[/tex]
[tex]C^*_c = 0.9437 \ kgC/m^3[/tex]
However; for 0.0069 wt% C
[tex]C^*_c = \dfrac{C_c}{\dfrac{C_c}{\rho_c}+\dfrac{C_{Fe}}{\rho_{Fe}}}\times 10^3[/tex]
[tex]C^*_c = \dfrac{0.0069}{\dfrac{0.0069}{2.25 \ g/cm^3}+\dfrac{99.9931}{7.87 \ g/cm^3}}\times 10^3[/tex]
[tex]C^*_c =0.5429 \ kgC/m^3[/tex]
Thus; the diffusion coefficient can be computed by using the formula:
[tex]D = - J \begin {bmatrix} \dfrac{x_A-x_B}{C_A-C_B}\end {bmatrix}[/tex]
[tex]D = - (3.6 \times 10^{-8} \ kg/m^2-s) \begin {bmatrix} \dfrac{-15^{-3} \ m }{0.9437 \ kgC/m^3 - 0.5429 \ kgC/m^3}\end {bmatrix}[/tex]
D = 2.6613 × 10⁻¹¹ m²/s
1. How does Newton’s first law prove that planets are moving in a circular pattern?
2. How does Newton’s third law prove that Earth is moving and the Sun is not?
3.Using Newton’s law of gravitation and the third law of motion, argue qualitatively how the ratio between the orbital period and the radius of a planet do or do not change, based upon Kepler’s third law of motion.
Answer:
Explanation:
Newton's First Law of Motion states that a body in motion keeps the same motion unless acted upon by an outside force. Likewise, if it is not moving, it remains that way unless a force acts on it.
What will be the final velocity of a car, if it starts
to make from ges and accelerates at 10 m/s² after 5 seconds?
Samantha always feels rushed in the morning, and she often forgets important items when she leave for school
What is Terminal Velocity
Answer:
the maximum velocity attainable by an object as it falls through a fluid or the air
Explanation:
Help Plz ;)
In the diagram below, 4 pairs of metal spheres of equal size sit on a level surface the same distance apart. However, the type of metal each sphere is made from changes the mass of these spheres. Which pair of metal spheres has the greatest gravitational attraction between them?
Answer:
Errrrrrrm I believe it would be (D)
DESPERATE WILL GIVE BRAILIST
Which of the following is NOT an agent of change in the rock cycle?
A. Cooling and crystallization
B. Weathering and erosion
C. Cementation and compaction
D. Drying and decaying
Answer:
A
Explanation: I don't think I ever heard of Crystalization being apart of the rock Cycle but I could be wrong hope this helps
Two blocks are arranged at the ends of a massless cord over a frictionless massless pulley as
shown in the figure. Assume the system starts
from rest. When the masses have moved a distance of 0.317 m, their speed is 1.33 m/s.
The acceleration of gravity is 9.8 m/s
2
What is the coefficient of friction between
m2 and the table?
What is the magnitude of the tension in the
cord?
Answer in units of N.
Answer:
The coefficient of friction between m₂ and the table is approximately 0.2703
The magnitude of the tension in cable is 28.737 N
Explanation:
The given parameters are;
The mass of the block on the table, m₂ = 5.8 kg
The mass of the hanging block, m₁ = 4.5 kg
The distance in which the block has moved = 0.317 m
The speed after the block moves = 1.33 m/s
The acceleration due to gravity, g = 9.8 m/s²
The coefficient of friction between m₂ and the table = μ
The acceleration, a, of the blocks is given from the formula of speed, v, of a body at a given distance, s, from rest as follows;
v² = 2 × a × s
Where;
v = 1.33 m/s
s = 0.317 m
Substituting the values gives;
1.33² = 2 × a × 0.317
a = 1.33²/(2 × 0.317) ≈ 2.79
The acceleration, a ≈ 2.79 m/s²
Therefore, we have the force acting on the system given as follows;
Weight of m₁ - Frictional force of m₂ = (m₁ + m₂) × a
4.5 × 9.8 - 5.8 × 9.8 × μ = (4.5 + 5.8) × 2.79
4.5 × 9.8 - 5.8 × 9.8 × μ = 28.737 N
(4.5 × 9.8)N - 28.737 N = 5.8 × 9.8 × μ
44.1 N - 28.737 N =56.84 N × μ
15.363 N = 56.84 N × μ
μ = 15.363 N/(56.84 N) ≈ 0.2703
The coefficient of friction between m₂ and the table = μ ≈ 0.2703
The coefficient of friction between m₂ and the table ≈ 0.2703
The magnitude of the tension in cable = (m₁ + m₂) × a = 28.737 N.
The magnitude of the tension in cable = 28.737 N
The diagram models a sound wave traveling through a liquid.
Which diagram models how the sound wave will change when it enters a gas?
Answer:
The correct option is;
A.
Explanation:
The speed of sound varies with the medium within which the sound propagates. Therefore, the wavelength of the sound wave changes as it moves from one medium to another
The speed of sound in liquid which is given by the square root of the ratio of the bulk modulus (compression resistance) to the density of the liquid is generally faster than in gas, therefore, given that the frequency of the sound source in constant, the wavelength, λ, given as λ = v/f, which is therefore, directly proportional to the speed of sound, also reduces, which is represented by a reduced distance between successive crest as seen in figure A.
A dragster's top acceleration is 60m/s2. If it accelerates for 3 seconds from the starting line, how fast will it be going
Answer:
180 m/s
Explanation:
acceleration = 60 m/s2
time = 3 secs
u(initial velocity) = 0 m/s
v(final velocity) = ?
equation used is = v = u + at
0 + 60*3
v = 180 m/s
A dragster's top acceleration is 60 meters/second². If it accelerates for 3 seconds from the starting line, then the total distance covered by it would be
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object.
As given in the problem a dragster's top acceleration is 60 meters/second². If it accelerates for 3 seconds from the starting line, then we have to find out the total distance traveled by it,
top acceleration of the dragster = 60 meters/second²
time period to accelerate = 3 seconds
By using the second equation of motion,
s = ut + 1/2at²
s = 0 + 0.5×60×3²
s = 270 meters
Thus, the total distance covered by the dragster would be 270 meters
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What is an application of this model?
А
It highlights the artistic abilities of scientists.
B
It illustrates the basic structure of an atom. .
С
It shows how the parts of an atom interact.
D
It demonstrates how atoms form and function.