Answer:
Controlled variable: the height from which the ball is dropped and the floor tile on which the ball hits
Independent variable: different tennis ball brands
Dependent variable: height of bounce in centimeters
Explanation:
Scientific experiments have three major kinds of variables:
Independent variable: This is the variable that is subject to the manipulation of the experimenter. The values of this variable are determined by the experimenter. In this example, Elizabeth determines the brand of tennis ball to be tested, hence the tennis ball brand is the independent variable
Dependent variable: This variable has values which are a result of the effect of the manipulation of the independent variable. The values of the dependent variable are not under the direct control of the experimenter. They are simply the results of the experiment. Here, the height to which the ball bounces is not predetermined, hence it is the outcome or dependent variable.
Control variables; These are variables that can affect the outcome of the results of the experiment but are kept constant throughout the experiment, to rule out biases when testing the effect of the independent variable.
1. chemistry the study of matter and energy and how they interact 2. physics the systematic study and analysis of facts 3. science a process to test a proposed solution to a problem 4. scientific method the study of the structure, properties, and interactions of materials and the changes they undergo
Answer:
1. Chemistry- the study of the structure, properties, and interactions of materials and the changes they undergo.
2. Physics- the study of matter and energy and how they interact.
3. Science- the systematic study and analysis of facts.
4. Scientific method- a process to test a proposed solution to a problem.
Explanation:
1. Chemistry is a branch of science that deals with the study of the structures, properties, and interactions of various materials with other materials. It also includes the study of such changes that may occur during such interactions.
2. Physics is also one branch of science that deals with the study of matter and energy. Contrary to chemistry, this scientific branch deals with the interaction of matter and energy, their motion, and behavior especially related to space and time.
3. Science is the systemic study and analysis of facts. It is the understanding of the natural and scientific world, dealing with the elements of how and why things work.
4. Scientific method is the method or process by which tests are made to ascertain problems and find a solution for such. It is the method of getting knowledge and solutions, the experimentation to get to a conclusive result.
A block hangs from the ceiling by a spring. What are the forces acting on the block (assume the block is not moving). Choose all that apply.
please help i need an answer ASAP :C
the French Broad, The Mississippi, and the Amazon are examples of ____
-turbidity
-streams
-springs
-rivers
Which of the following accurately describes how a magnetic motor works
a
A set of electric coils are placed in a magnetic field. When a current passes through the wire, it creates a reaction that causes the atoms to being to shift into place
b
A set of electric coils are placed in a magnetic field. When a current passes through them, they create a magnetic field which interacts with the first magnetic field, causing the set of coils to rotate
c
A set of magnets are placed in an electric field. As the current increases or decreases, the strength of the electric field changes, causing the magnet to be more or less moved by the field
d
A set of magnets are placed in an electric field. A current is run through the magnets, thus increasing their magnetic fields. Once the magnetic field is increased, the magnets can be manipulated by the electric field by being guided around
Answer:
The correct option is;
c. A set of magnets are placed in an electric field. As the current increases or decreases, the strength of the electric field changes, causing the magnet to be more or less moved by the field
Explanation:
A permanent magnet motor is an electric motor that utilizes permanent magnets combined with a coil of electric wire winding rather than there being only the the electric wire windings in the motor
The principle of operation of a permanent magnet motor involves the rotation of a magnetic rotor by the electromagnetic force generated from the outer stator coil when power is supplied to the stator windings from an external source.
Suppose the deer population in a region is expected to increase by 6% in the next year. If there are currently 11,650 deer living in the region, approximately how many will be living there a year from now?
Answer:
12,349 deers
Explanation:
Present population size of deer = 11,650
Expected percentage increase in population size by next year = 6%
6% of 11,650 = 6/100 x 11,650
= 699
Adding this to the present population: 11,650 + 699 = 12,349.
Hence, the total number of deer expected to be living in the population a year from now (that is, next year) is 12,349 deers.
A cart is loaded with a brick and pulled up a ramp. If the mass of the loaded cart is 3.0 kg and the height of the seat top is 0.45 meters, then what is the potential energy of the loaded cart on top of the ramp?
Answer:
Potential energy = 13.23 J
Explanation:
Given that,
The mass of the loaded cart, m = 3 kg
Its height of the seat top is 0.45 m
We need to find the potential energy of the loaded cart on top of the ramp. We know that, the potential energy of an object is due to its height. It can be given by the formula as follows :
[tex]E=mgh\\\\E=3\ kg\times 9.8\ m/s^2\times 0.45\ m\\\\E=13.23\ J[/tex]
So, the required potential energy is 13.23 J.
A ball is thrown straight up in the air with a velocity of 12 m/s. Find the maximum height the ball reaches.
Show your work
Answer:
7.35 m
Explanation:
We can solve with kinematics or with energy.
Using kinematics, given:
v₀ = 12 m/s
v = 0 m/s
a = -9.8 m/s²
Find: Δy
v² = v₀² + 2aΔy
(0 m/s)² = (12 m/s)² + 2 (-9.8 m/s²) Δy
Δy = 7.35 m
Using energy instead:
PE = KE
mgh = ½ mv²
gh = ½ v²
h = v² / (2g)
h = (12 m/s)² / (2 × 9.8 m/s²)
h = 7.35 m
A student observes an 8.0-kilogram shopping cart accelerate uniformly across a parking lot. It reaches a speed of 4.0 meters per second in 0.5 seconds. What is the magnitude of the force that causes the shopping cart to accelerate?
Answer:
F = 64 N
Explanation:
Given that,
Mass of the shopping cart, m = 8 kg
Initial speed of the shopping cart, u = 0
Final speed of the shopping cart, v = 4 m/s
Time, t = 0.5 s
We need to find the magnitude of the force that causes the shopping cart to accelerate. The force is given by the formula as follows :
[tex]F=ma\\\\F=\dfrac{m(v-u)}{t}\\\\F=\dfrac{8\times (4-0)}{0.5}\\\\F=64\ N[/tex]
So, the magnitude of force is 64 N.
What controllable risk factors for heart disease did Brenda’s father have?
Controllable risk factors that Brenda'a father may have had include dietary choices, amount of exercise, sleep schedule, among other things.
The controllable risk factors for heart disease that Brenda’s father has include stress, smoking, high blood pressure, etc.
Blood pressure is a risk factor for heart disease. High blood pressure increases the risk of heart disease.
Another risk factor is smoking. It is advisable for people not to smoke in order to avoid having diseases. If one smokes, there's a higher chance that the person will have heart disease.
In conclusion, it's also important for one to rest very well and not stress himself or herself.
Read related link on:
https://brainly.com/question/22909359
A boy climbs to the roof of his house and throws a rock at a horizontal velocity of 11.5 m/s. The rock lands on the ground, 15.3 m from the base of the house. How high is the roof of the house?
Answer:
The roof of the house is 8.67 m high
Explanation:
Horizontal Motion
When an object is thrown horizontally with a speed v from a height h, the range or maximum horizontal distance traveled by the object can be calculated as follows:
[tex]\displaystyle d=v\cdot\sqrt{\frac {2h}{g}}[/tex]
The boy is on the roof of his house and throws a rock horizontally at v=11.5 m/s. It lands on the ground d=15.3 m from the base of the house. We can use the above equation to find the height of the roof by solving it by h:
[tex]\displaystyle h=\frac{gd^2}{2v^2}[/tex]
Substituting values:
[tex]\displaystyle h=\frac{9.8\cdot 15.3^2}{2\cdot 11.5^2}[/tex]
h=8.67 m
The roof of the house is 8.67 m high
6.
How long would it take a 125 W electric motor to do 825 j of work?
Answer:
According to formula of power N = A/t Given by : N = 125 W and A = 825 J.
Here, N --- power ; A --- work ; t --- time.
Now, we can find the time t = A/N = 6.6 s
Explanation:
Explain the relationship between temperature, density, and states of
matter
Answer:
Higher temperature makes an object less dense 2. Density governs the state of matter for the object, hence as water becomes less and less dense, it becomes gas (water vapour) 3. Higher temperature makes an object has more pressure, hotter gas has higher pressure.
Explanation:
Relation Between Density and Temperature Temperature is the measure of heat. Density is the measure of how closely any given entity is packed or it is the ratio of the mass of the entity to its volume.
I hope this works
The starting velocity was 0 m/s, and the final velocity
was -15.35 m/s. Based on this, what was the average
velocity of the rock? In general, to find the average of
any 2 things, you add them together and divide by how
many things there are.
Answer:
The average velocity is -7.675 m/s
Explanation:
Given;
initial velocity, u = 0 m/s
final velocity, v = -15.35 m/s
Based on the follow up state " In general, to find the average of any 2 things, you add them together and divide by how many things there are", the average velocity will be calculate as ;
Sum of the velocities = 0 m/s + (-15.35 m/s) = -15.35 m/s
Number of velocites = 2
AVERAGE VELOCITY = (-15.35 m/s) / (2)
AVERAGE VELOCITY = -7.675 m/s
No matter where the light bulb is located on the central axis, what is always true about the size of the image?
Answer:
there is no image
Explanation:
2. Marta was biking along the bike path at an average velocity of +4.2 m/s. If she biked for 800 seconds,
how far did she travel? (4 pts)
Answer:
3360m
Explanation:
Given parameters:
Average velocity of Marta = 4.2m/s
Time taken for biking = 800s
Unknown:
Distance traveled =?
Solution:
Velocity is the rate of change of displacement with time.
Displacement = velocity x time
Input the parameters and solve;
Displacement = 4.2 x 800 = 3360m
Calculate the acceleration of a 300,000-kg jumbo jet just before takeoff when the thrust on the aircraft is
120,000n
I
Answer:
0.4 m/s²
Explanation:
Use Newton's second law.
∑F = ma
120,000 N = (300,000 kg) a
a = 0.4 m/s²
A student did 24 J of work on a chair. She applied a force of 12 N and moved the chair 2 m. What question do you need to ask to determine the amount of power used?
Answer:
Explanation:
Power is expressed as P = Force * Distance/time
From the formula given, the following parameters is needed to calculate power
1) Work done
2) force
3) Distance
4) Time
From the question, the given data is incomplete. We are supposed to be given the time taken to moved the chair over the distance. with the time we can easily calculate the power used up by the student.
2 points
If a break-dancer lies down on the ground on his back, his force of 635 N
is spread over an area of 0.75 m2. How much pressure does he exert on
the ground in this position? *
ws
846.7 Pa
O 84.7Pa
O 8.467 Pa
8467.7 Pa
Answer:
846.7Pa
Explanation:
Given parameters:
Force = 635N
Area = 0.75m²
Unknown:
Pressure = ?
Solution:
Pressure is the force per unit area on a body.
Pressure = [tex]\frac{Force}{Area}[/tex]
Insert the parameters and solve;
Pressure = [tex]\frac{635}{0.75}[/tex] = 846.7Pa
Can somebody plz answer this grade6 science question? Only answer in
1-2 sentences!
(WILL MARK BRAINLIEST)
Answer:
Alkali metals are reactive, soft metals with low densities. Noble gases are all unreactive non-metals
Explanation:
4. Maria wondered if different colors (red, orange, yellow, green, blue, and purple) of plastic wrap affected the time for bread to mold. She also wrapped a slices of bread in clear plastic wrap to see how they may normally mold. Before wrapping the same type of bread (Wonder Whole Wheat), she placed 5 ml of water in the center of each slice. The slices were of the same size and wrapped in the same manner and kept in a dark space at 75 degrees Fahrenheit. She measured the area of mold growth for one week after the mold first appeared. She observed 25 slices of bread for each color of wrap and the clear wrap as well. what is the constant variable the independant variable and the depentant variable
Answer:
Constant variable: SAME TYPE OF BREAD (Wonder whole wheat), SAME AMOUNT OF WATER (5ml), SAME SIZE OF BREAD SLICE, SAME TEMPERATURE (75°F)
Independant variable: COLORS OF PLASTIC WRAP
Depentant variable: TIME FOR BREAD TO MOLD
Explanation:
In any experiment, the independent variable is the variable that is deliberately changed or manipulated by the experimenter. In this case, the independent variable is the DIFFERENT COLORS OF PLASTIC WRAP USED (red, orange, yellow, green, blue, and purple).
Dependent variable is the variable that the experimenter measures in an experiment. It is the variable that responds to changes made to the independent variable. In this experiment, the dependent variable is the TIME IT TAKES FOR BREAD TO MOLD.
Constant variable, also known as Controlled variable, is the variable that the experimenter keeps constant or unchanged for all groups throughout the experiment. In this experiment, the constants are: SAME TYPE OF BREAD (Wonder whole wheat), SAME AMOUNT OF WATER (5ml), SAME SIZE OF BREAD SLICE, SAME TEMPERATURE (75°F)
Using terms like GPE, KE, Transfer, Transfermation and Law of Conservation of Energy. Will a ball placeced at the start arrow and allowed to roll make it to the finish arrow? Why?
An object of mass 10 kg is released from rest above the surface of a planet such that the object’s speed as a function of time is shown by the graph above. The force due to gravity exerted on the object is most nearly
Answer:
100NExplanation:
Hey there!!!, there are no attached files/graphs to this question, but we can find our way and solve for the gravitational force acting on the mass
Step one:
given data
mass= 10kg
acceleration due to gravity= 9.81m/s^2
Step two:
The expression for the gravitation force is given as
Gravitational force F=mass * acceleration due to gravity
Fg=ma
substituting we have
Fg=10*9.81
Fg=98.1N
The force due to gravity exerted on the object is most nearly 100N
While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 6.25 m/s. The stone subsequently falls to the ground, which is 13.3 m below the point where the stone leaves your hand. At what speed does the stone impact the ground? How much time is the stone in the air? Ignore air resistance and take g = 9.8 m/s2.
Answer:
1.) 17.3 m/s
2.) 1.8 s
Explanation:
Given that While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 6.25 m/s.
The maximum height will be calculated by using third equation of motion
At maximum height, V = 0
V^2 = U^2 - 2gH
0 = 6.25^2 - 2 × 9.8 × H
39.06 = 19.6H
H = 39.06 / 19.6
H = 1.993m
The stone subsequently falls to the ground, which is 13.3 m below the point where the stone leaves your hand. At what speed does the stone impact the ground?
Using the same formula again.
Where the height = 13.3 + 1.993
Height = 15.29m
Substitutes the height into the third equation of motion
V^2 = U^2 + 2gH
U = 0
V^2 = 0 + 2 × 9.8 × 15.29
V^2 = 299.74
V = sqrt ( 299.74 )
V = 17.3 m/s
How much time is the stone in the air? Ignore air resistance and take g = 9.8 m/s2.
Using the second equation of motion formula
H = Ut + 1/2gt^2
U = 0
15.29 = 1/2 × 9.8 × t^2
15.29 = 4.9t^2
t^2 = 15.29 / 4.9
t^2 = 3.120
t = sqrt ( 3.120 )
t = 1.766 s
Therefore, the stone is on air for 1.8s approximately.
You stand on a pier watching water waves and see 10.9 waves pass by in a time of 28 seconds. What is the frequency of the water waves?
Answer:
0.4Hz
Explanation:
Given parameters:
Number of waves = 10.9waves
Time taken = 28s
Unknown:
Frequency of water waves = ?
Solution:
The frequency of a wave is the number of waves that passes through a point per unit of time.
Frequency = [tex]\frac{number of waves }{time}[/tex]
Insert parameters and solve;
Frequency = [tex]\frac{10.9}{28}[/tex] = 0.4Hz
There is a temperature change of 3 °C in the room when 1.5 kg of water flows through the
radiator each second.
The specific heat capacity of water is 4200 J/kg°C.
i.
Calculate the amount of energy given to the room by the 1.5 kg of water as it passes
through the radiator.
Show your working and write down the unit.
Answer:
18900J
Explanation:
energy = Temperature change * Mass * Specific Heat Capacity
3*1.5*4200=18900
=18900J
Answer:
Explanation:
Q = mcT
where,
Q is heat(energy)
m is mass
c is specific heat capacity
T is change in temperature
so,
Q= 1.5kg x 4200 J/kg.C x 3C
Q = 18900J of energy
What happens to the tension in the string as the weight of the block increases? Explain your answer
Answer:
the weight becomes thicker and harder to carry as the weight plottens,
Explanation:
i did this
At what point does the rollercoaster have the most GPE? A,C B,A C,E D,B E,D
Answer:
b
Explanation:
a motor with an efficiency of 75 percent must supply 240J of useful work. what amount of work must be supplied to the motor
Answer:
e=75%=0.75 work output = usful work=240j
Explanation:
A hockey puck with a mass of 0.17 kg is traveling to the right along the ice at 15 m/s. It strikes a second hockey puck with a mass 0.11 kg. The first hockey puck comes to rest after the collision. What is the initial momentum of the system? Round to the nearest tenth.
Answer: 2.6
Explanation: Just trust me...
What are some immediate effects that alcohol have on people?
Answer:
Depending on how much is taken and the physical condition of the individual, alcohol can cause:
-Slurred speech.
-Drowsiness.
-Vomiting.
-Diarrhea.
-Upset stomach.
-Headaches.
-Breathing difficulties.
-Distorted vision and hearing.
Explanation: