Answer:
a=2ms⁻²
Explanation:
v=8ms⁻¹ u=2ms⁻¹ t=3secs
a=[tex]\frac{v-u}{t\\}[/tex]
a=[tex]\frac{6}{3}[/tex]
a=2ms⁻²
Answer:
a=2ms-2
Explanation:
hope this helped
While standing on a balcony a child drops a penny. The penny lands on the ground floor 1.5 s later. How fast was the penny traveling vertically when it struck the ground floor?
*The height of the balcony is 11.025 meters
Answer:
14.7 m/s.
Explanation:
From the question given above, the following data were obtained:
Time (t) = 1.5 s
Acceleration due to gravity (g) = 9.8 m/s².
Height = 11.025 m
Final velocity (v) = 0 m/s
Initial velocity (u) =?
We, can obtain the initial velocity of the penny as follow:
H = ½(v + u) t
11.025 = ½ (0 + u) × 1.5
11.025 = ½ × u × 1.5
11.025 = u × 0.75
Divide both side by 0.75
u = 11.025/0.75
u = 14.7 m/s
Therefore, the penny was travelling at 14.7 m/s before hitting the ground.
Match the term with the correct description.
1. energy levels
2. protons
3. neutrons
4. electrons
c. varying ranges of energy that electrons can have
b. neutrally charged particles
d. negatively charged particles
a positively charged particles
In a closed system that has 45 J of mechanical energy, the gravitational
potential energy of a ball rolling down an inclined plane decreases from 8 J to
Answer:
the answer is d
Explanation:
I just did this test
A red bouncy ball is dropped from 10 meters high. As it fails a wind is blowing horizontal at the speed of 15 m/s. How far horizontally will the ball hit from the point at which it was dropped? Please round to 1 decimal place. You will enter in units of meters but NUMBER ONLY.
4. A car accelerates uniformly from rest at 3.2 m/s^.
When the car has traveled a distance of 40.
meters, its speed will be
(1) 8.0 m/s
(2) 12.5 m/s
(3) 16 m/s
(4) 128 m/s
Answer:
A
Explanation:
The final speed of the car is: (3) 16 m/s.
Given the following data:
Initial speed = 0 m/s (since it accelerated from rest).Acceleration = 3.2 [tex]m/s^2[/tex]Distance = 40 meters.To find the final speed of the car, we would use the third equation of motion;
[tex]V^2 = U^2 + 2aS[/tex]
Where:
V is the final speed.U is the initial speed.a is the acceleration.S is the distance covered.Substituting the given parameters into the formula, we have;
[tex]V^2 = 0^2 + 2(3.2)(40)[/tex]
[tex]V^2 = 2[/tex] × [tex]3.2[/tex] × [tex]40[/tex]
[tex]V^2 = 256\\\\V = \sqrt{256}[/tex]
Final speed, V = 16 m/s
Therefore, the final speed of the car is 16 m/s.
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if on average you walk 1.20 meters every second , how long do you walk i one hour?
Answer:
Explanation:
En cuánto tiempo se pueden caminar 20 km? Una persona sana, acostumbrada a andar camina a unos 4 o 5 kilómetros/hora, en terreno llano. Puede tardar 5 horas o 4.
Answer:
4,320meters
Explanation:
a psychologist studies if internet uses causes isolation
A) experimental
B) correlational
C) Descriptive
Hey can you plz help me
Leo makes an electrical circuit using a battery, copper connection wires and a
lamp.
1 Diagram the assembly and say if the lamp lights up.
2 Specify the direction of movement of the free electrons.
3 Leo reverses the connections to the battery terminals. In which direction do the
free electrons
Why are there no famous women scientists associated with cell theory?
Answer:
there is you just have to look harder
Explanation:
Which has more kinetic energy, a 40 kg cheetah running at 25 m/s or a 4,000 kg elephant moving at 2 m/s? How much more energy does it have?
Answer:
1st case; mass=40 kg
v=25m/s
K.E.=1/2[40][25]^2=12,500 J
2nd case; mass=4,000 kg
v=2 m/s
K.E.=1/2[4000][2]^2=8000J
in case 1 Kinetic energy is greater.
Explanation:
If the number of homes with a pet dog is equal to 250, how many total homes are represented by the chart?
A.500
B.cannot be determined
C.250
D.125
:)
Answer:
Option A. 500
Explanation:
From the question given, we obtained the following:
Numbers of home with pet dogs = 250
Percentage with pet dogs = 50%
Total number of homes =.?
Thus, we can obtain the total number of homes represented by the chart as follow:
Let T be the total number of Homes.
Number of homes with dog = percentage of homes with dog × total number
Numbers of home with pet dogs = 250
Percentage with pet dogs = 50%
Total number of homes = T
250 = 50% × T
Divide both side by 50%
T = 250 ÷ 50%
T = 250 ÷ 50/100
T = 250 × 100/50
T = 250 × 2
T = 500
Therefore, the total number of homes represented by the chart is 500.
WILL GIVE BRAINLIEST!!!!!!!!!!!!!!!!!!
Answer:
9)a
10) I think true
11)b
Explanation:
9)a. because it's told that the car is slowing down, the sum of the forces that are towards left, should be more than the ones that are towards right. if the car was gaining speed, "b" would have been correct. and if it was told that the car is moving without a change in the speed, "c" would have been correct.
10) if a moving object has a change of speed or direction, it would have an acceleration. now if a moving object experiences an unbalanced force, it'd either slow down, gain speed or change direction, and in all of the three possibilities it'd have an acceleration.
11) upward and downward forces are equal, and the sum of them would be 0N(because they have opposite directions). so they negate each other.
and the rightward force is 5N more than the leftward force. so the Net Force would be 5N.
-30+30-10+15=5N
if it is unclear or you need more explanation, ask freely.
A student walks 4 blocks east, 1 blocks north, 2 block west and then 1 blocks south in an hour. Her average velocity is?
Answer:
2 m/s
Explanation:
Given that a student walks 4 blocks east, 1 blocks north, 2 block west and then 1 blocks south in an hour.
The total time = 1 hour
The vertical displacement = 1 - 1
Vertical displacement = 0
Horizontal displacement = 4 - 2
Horizontal displacement = 2
Total displacement = sqrt (2^2 - 0^2)
Total Displacement = 2
Average velocity = displacement/time
average velocity = 2 / 1
Average velocity = 2 m/s
Therefore, her average velocity is 2 metres per second.
(MICROWAVE)
Describe the device and its function.
what should scientists do when they see that the data collection or analysis from their experiment phyhas limitations APEX
A. describe the limitations in detail in thier final report.m
B. ignore the limitations when they draw conclusions.
C. repeat the experiment to see if it still has limitations.
D. decide not to report any of the expromental results.
Answer:
C. Describes the limitations in detail in their final report.
Explanation:
A. Describe the limitations in detail in their final report
A crate is dragged across an ice covered lake. The box accelerates at 0.08 m/s2 and is pulled
by a 47 N force. What is the mass of the box?
Given parameters:
Rate of acceleration of the box = 0.08m/s²
Force applied to the box = 47N
Unknown:
Mass of the box = ?
The force applied on a body is push or pull on it to move it in a specific direction. Force causes the motion of a body.
Mathematically, force is expressed as the product of mass and acceleration;
Force = mass x acceleration
Input parameters and solve for mass;
47 = mass x 0.08
mass = [tex]\frac{47}{0.08}[/tex]
mass = 587.5Kg
The mass of the box is 587.5Kg
3. A car advertisement states that a certain car can accelerate from rest to 70 km/h in 7 seconds.
Find the car's average acceleration.
Answer:
10 km/s^2
Explanation:
Acceleration = velocity/time
a= 70km/7s
= 10km/s^2
non-native species that have rapidly increasing populations that spread
and displace native species
Answer:
Invasive Species
Explanation:
Plz give brainliest
The normal force acts ________________________ to the surface and the friction force act _______________ to the surface.
Which event is an example of vaporization?
O A. People see their breath on a cold winter day.
OB. A spilled drop of rubbing alcohol slowly disappears.
O C. Dew forms on the leaves of a tree.
O D. Fog forms in a valley.
Answer:
B
Explanation:
A spilled drop of rubbing alcohol slowly disappears is an example of evaporation. Hence, option B is correct.
What is Vaporization?The transformation of a substance into a gaseous (vapor) phase from a liquid or solid state. Boiling is the term for the vaporization process when conditions permit the creation of vapor bubbles within a liquid. A solid is instantly transformed into a vapor by the process of sublimation.
A solid or liquid must be heated to vaporize it. Insufficient heat from the environment may originate from the system itself in the form of a drop in temperature. The cohesive forces that hold the atoms or molecules of a liquid or solid together must be overcome to separate the atoms or molecules to produce the vapor, the heat of vaporization is a direct indicator of these forces.
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the product of m1m2 in the formula for gravitational force is always
negative, because the product of two positive numbers is negative.
positive, because the product of two positive numbers is positive.
positive, because the product of two negative numbers is positive.
negative, because the product of two negative numbers is negative.
Answer:
The correct answer is the second option
Explanation:
The formula in question (for gravitational force) is provided below
F = G.m₁.m₂/r²
Where
F = force of gravity
G = gravity constant (6.674 × 10⁻¹¹ m.kg⁻¹.s⁻²)
m₁ and m₂ = are the masses of the objects
r² = distance between the centers of the two objects
From the above, it can be deduced that m₁ and m₂ are masses and hence can only be positive. Positives multiplied together only gives positive, thus the second option is correct.
What is the weight of a substance that exactly fills a 200.0 mL container? The density of it is 0.789 g/mL
Answer:
The answer is 157.8 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 200 mL
density = 0.789 g/mL
We have
mass = 0.789 × 200
We have the final answer as
157.8 gHope this helps you
what is the materials of seprating salt,sand,iron fillings and beads.(Be specific)
Explanation:
Generally, materials are separated according to differences in their physical properties. During the separation process, it is important not to chemically change any of the parts of the mixture if possible. This avoids costly chemical processes and loss of material. It is best to try to separate one component at a time, which means that this experiment can be expected to have at least three stages, corresponding to the removal of each component from the mixture.
Physical properties
In this experiment, the three constituent materials in the mixture are solids with significantly different physical properties, which makes separation easier.
Iron is a magnetic solid which is insoluble in water.
Salt is a non-magnetic solid which is soluble in water.
Sand is a non-magnetic solid which is insoluble in water.
IN SPECIFIC:
Iron is magnetic and the other two not, which means a magnet could be used to attract the iron filings out of the mixture, leaving the salt and sand. Salt is water soluble, while sand is not. This means the two can be mixed in water and stirred. The salt will dissolve and the sand willnot.
A bridge spanning a river is 98.0 meters above the water.
How long would it take a rock dropped from the bridge to hit the water?
Explain why a schoolbus appears to be yellow.
A. Yellow light is absorbed, while all other colors are reflected.
B. All colors are reflected, but yellow is reflected at a more direct angle.
C. All colors are reflected, but only yellow makes it to your eyes.
D. Yellow light is reflected, while all other colors are absorbed.
Which statement describes a question that can be answered by a scientific
investigation?
A. It is a question that can be answered by gathering other scientists'
opinions.
B. It is a question that can be answered by gathering data during an
experiment.
C. It is a question about a phenomenon of which no measurements
can be taken.
D. It is a question about the sequence of experimental steps.
Answer:
Its b
Explanation:
I just did this question
The question that can be answered by scientific investigation is that can be answered by gathering data during an experiment. Thus option B is correct.
What is scientific investigation?Investigation on a natural phenomenon or process to solve a scientific question or to solve a social or environmental issue by well designed experiments based on reasonable observations is called scientific investigation.
A scientific investigation includes, variables, hypothesis , observations, research methodology. Scientific experiments have to well designed to address all the outcomes of the observations and must be feasible to prove whether the hypothesis is true or not.
Scientific investigations cannot be conducted based on only opinions from scientists or scientific record. The data have to be collected through experiments conducted by well designed research methodology.
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An Olympic-class sprinter starts a race with an acceleration of
4.50 m/s^2
. (a) What is her speed 2.40 s later? (b) Sketch a graph of her position vs. time for this period.
Answer:
a) Vf = 10.8 [m/s]
b) See the image attached.
Explanation:
a)
To solve this part we must use the following kinematics equation:
[tex]v_{f} =v_{o} + (a*t)[/tex]
where:
Vf = final velocity [m/s^2]
Vo = initial velocity = 0
a = aceleration = 4.5 [m/s^2]
t = time = 2.4 [s]
Note: The initial velocity is taken as zero, as the athlete starts from rest
Vf = 0 + (4.5*2.4)
Vf = 10.8 [m/s]
b)
Now knowing that acceleration remains constant between the time interval between 0 to 2.4 seconds. We will take 5 different times between the 2.4 elapsed.
Dt = 2.4/5
Dt = 0.48 [s]
So the first time is 0, the second will be (0 + 0.48) = 0.48, the third (0.48 + 0.48) = 0.96, the fourth (0.96 + 0.48) = 1.44, and the fifth (1.44 + 0,48) = 1.92, and the last one (1.92 + 0.48) = 2.4
We need to find the velocity for each time calculated before, with the ecuation used in a) we cand calculate the different velocities.
Vfo = 0 + (4.5*0) = 0
Vf1 = 0 + (4.5*0.48) = 2.16 [m/s]
Vf2 = 0 + (4.5*0.96) = 4.32 [m/s]
Vf3 = 0 + (4.5*1.44) = 6.48 [m/s]
Vf4 = 0 + (4.5*1.92) = 8.64 [m/s]
Vf5 = 0 + (4.5*2.4) = 10.8 [m/s]
The next step is to use the following equation of kinematics, to be able to determine the position of the athlete for each speed.
[tex]v_{f}^{2} =v_{i}^{2} +(2*a*x)\\if \\v_{i}=0\\then\\x = \frac{v_{f}^{2}}{2*a}[/tex]
x1 = 0
x2 = (2.16)^2/(2*4.5) = 0.518 [m]
x3 = (4.32)^2/(2*4.5) = 2.074 [m]
x4 = (6.48)^2/(2*4.5) = 4.67 [m]
x5 = (8.64)^2/(2*4.5) = 8.29 [m]
x6 = (10.8)^2/(2*4.5) = 12.96 [m]
Now in the x-axis we put the time values found before as well the x values en the y-axis.
2. The location of an object is called its
A. Direction
b. Position. C. Motion D. Displacement
The location of an object is called its Position, therefore the correct answer is option B.
What is displacement?An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard. Displacement describes this shift in location.
The indeterminate arrangement of axes used to describe an object's location and motion is known as a frame of reference. When describing the location of an item in relation to immovable objects located on Earth, we frequently use Earth as the frame of reference.
Any entity's precise coordinate or positioning, as determined by its fundamental dimensions or other factors, is known as its Actual Position. Position, thus, refers to how far your feature's location can deviate from its absolute position.
Thus, The location of an object is called its Position, therefore the correct answer is option B.
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A cyclist accelerates from 0 m/s to 10 m/s in 3 seconds. What is his acceleration?
Answer:
3.33 m/s^2
Explanation:
[tex]a = \frac{v \: - \: u}{t} [/tex]
V = final velocity ( 10m/s^2 )
U = Initial velocity ( 0m/s^2 )
t = Time taken ( 3 s )
[tex]a = \frac{10 - 0}{3} = 3.3333......[/tex]
approximately = 3.33 m/s^2
6.A truck drives to a rock quarry at a speed of 20 m/s. The truck takes on a load of
rocks, which doubles its mass, and leaves at the same speed of 20 m/s. Compare the
kinetic energy of the truck as it left the quarry with its kinetic energy on the way to the
quarry. Explain your answer.
Explanation:
The kinetic energy is basically the energy possesses by virtue of a body's motion
1. The truck moving to the quarry
let the mass be x
and the velocity is given as 20m/s
we know that the kinetic energy is given as
KE=1/2mv^2
KE=1/2(x)*20^2
KE=1/2(x)400
KE=200x
2. The truck leaving to the quarry
let the mass be 2x
and the velocity is given as 20m/s
we know that the kinetic energy is given as
KE=1/2mv^2
KE=1/2(2x)*20^2
KE=1/2(2x)400
KE=400x
From the analysis the kinetic energy is a function of mass, doubling the mass doubles the kinetic energy
