Answer:
4m/s
v=u+at
19=u+3*5
u=4m/s
2
The graph represents the movement of a body.
10
speed
m/s
8
6
4
N
0-
0 1 2 3 4
time, s
How far has the body moved after 5s?
A 2 m
B 10 m
C 25 m
D 50m
Answer:
D
Explanation:
it's the speed of the body I think
A scientist heats a piece of iron until it is glowing white–hot. He places the metal inside a metal box. He removes all of the air from the inside of the box. After a few seconds, the sides of the box that are not touching the metal begin to feel warm. Which process is most likely responsible for the warming?
Convection
Convection current
Radiation
Evaporation
Answer:
The answer is Radiation.
Explaination:
A and B are wrong because you can't have convection or convection currents without air, and all the air has been removed from the box.
D is wrong because there is no liquid in the box.
C is correct because heat can be transmitted even through a vacuum by radiation (e.g., the Sun). You can quickly feel the heat radiated by a piece of white-hot iron.
What is the velocity of a plane that traveled 3,000 miles from New York to California in 4.5 hours
Answer:
v = 666.67 mph
Explanation:
It is given that,
Distance from New York to California is 3000 miles
Time taken fromNew York to California is 4.5 hours
We need to find the velocity of a plane. Velocity is equal to the distance over time. So,
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{3000\ \text{miles}}{4.5\ \text{hour}}\\\\v=666.67\ \text{mph}[/tex]
So, the velocity of the plane is 666.67 mph.
what is the displacement if you walk 100m north, then 200m south, then 300m north
Answer:
200 m North
Explanation:
1. Let's represent north as positive and south as negative.
(100 m)+(-200 m)+(300 m)
= 200 m
2. Since the answer is positive, the units are 100 m NORTH since north represents positive.
A jogger runs 186 meters westward, then 210 meters eastward, then 156 meters westward, and finally 8A meters eastward.
Answer:
48
Explanation:
Given that a jogger runs 186 meters westward, then 210 meters eastward, then 156 meters westward, and finally 8A meters eastward.
To calculate the displacement, let assume that the
Westward = positive
Eastward = negative
Displacement = 186 - 210 + 156 - 84
Displacement = 342 - 294
Displacement = 48 m
Since the answer is positive, the direction of the displacement will be westward.
1500 + 30.4 = ? Use the correct number of significant figures. plz plz help me
Answer:
1530.4?
Explanation:
1500.0
+030.4
1530.4
ii) The distance travelled by an object in time
(100 + 1) s is (5.2 + 0.1) m. What is the
speed and it's error?
Ans: 0.052 ms-l, + 0.029 ms'
Answer:
v = (5.2 ± 0.2) 10⁻² m / s
Explanation:
This is an exercise in kinematics of uniform motion. The formula for the average speed is
v = x / t
let's calculate
v = 5.2 / 100
v = 0.052 m / s
v = 5.2 10-2 m / s
we have to find the uncertainty of this quantity we propagate the error using derivatives
Δv = dv /dx Δx + dv /dt Δt
taking everything in the most unfavorable case, I mean all positive
let's make the derivatives
dv / dx = 1 / t
dv / dt = -x / t²
we substitute
Δv = 1 /t Δx + x /t² Δt
let's calculate the error
Δv = 1/100 0.1 + 5.2 / 100² 1
Δv = 1 10⁻³ + 5.2 10⁻⁴
Δv = 1.52 10⁻³ m/s
the error must be given with a significant figure
Dv = 2 10⁻³ m / s
the answer is
v = (5.2 ± 0.2) 10⁻² m / s
What is the dependent variable in an experiment testing the effects of pH on growth of a seed?
a
Seed growth
b
pH
c
Filter paper
d
Type of seed
The correct answer is A. Seed growth
Explanation:
Experiments often involve two main variables: the independent variable and the dependent variable. In an experiment, the dependent variable is always the main factor being studied; also, this is "dependent" because it is affected by other factors. In the case presented, the dependent variable is seed growth because this is the specific phenomenon that is being analyzed. Moreover, this factor is affected by the changes in pH. On the other hand, the pH, which is the second factor is the independent variable because this is not affected by the first variable and it is manipulated on purpose.
Which is directly proportional to your weight on a planet's surface?
Answer:
Weight is directly proportional to our mass and acceleration due to gravity of that planet
Answer:
Your mass and the mass of the planet
Un objeto se mueve con una rapidez constante de 8 m/s. Esto significa que el objeto: a) Aumenta su rapidez en 8m/s cada segundo b) Disminuye su rapidez en 8m/s cada segundo c) No se mueve d) Tiene aceleracion positiva e) se mueve 800 cm cada segundo
Explanation:
Constant speed means that the object is covering equal distance in equal interval of time. The motion is called uniform motion for such case. In this problem, it is given that an object is moving with a constant speed of 8 m/s. It means that it does not change its speed. It is moving with a single speed constantly.
We can say that it moves 8 meters every second or 800 cm every second.
What kind of lens (converging or diverging) should he use to correct his eyesight, and what should be the focal length of the lens?
Incomplete question. However, I provided some information about when a converging or diverging lens is used. The common ones are:
Explanation:
In other to correct eyesight problems certain types of lenses are used depending on the condition.
Diverging lens: If the individual is suffering from nearsightedness (myopia); a condition that prevents a person from seeing distant objects clearly, but is able to see close objects clearly, then a divergent lens may be used to correct his eyesight.
Covergent lens: In a case where the person has a condition that prevents him from seeing close objects clearly while distant objects may be clear is called Farsightedness (hyperopia).
THE LARGEST HORIZONTAL PLATES IS SEPARATED BY 4mm .The plate is at the potencial of -6V . What potencial should be applied to the upper plate to create electric feild strength 4000Vm-1 ypward in the space between the plate
Answer:
V₂ = -22 V
Explanation:
Electric potential and field are related
ΔV = - E d
where ΔV is the potential difference between the plates, E the electric field and d the separation between the plates
In this exercise we are given the parcionero d = 4 mm = 0.004 m, the potential of one of the plates V1 = -6V and the value of the electric field E = 4000 V / m
V₂- V₁ = - E d
V₂ = - Ed + V₁
V₂ = - 4000 0.004 + (- 6)
V₂ = -16 - 6
V₂ = -22 V
Mr.Hernandez has 1,127student photos to display around the halls of the school. He plans to put them on 49 poster boards with the same number of photos on each board how many student photos will Mr. Hernandez place on each poster board
Answer:
23 student photos
Explanation:
All you have to do is divide 1,127 by 49. So take the photos and fill each poster board. There will be no photos left! Hope this helps!
in your own words provide two advantages of using meters as a measurement of length rather than old measurements of length such as hands or steps
Answer:
First, the meters is the unit used in almost all the world today.
Then using meters as your unit will be easier to read and interpret for a larger number of people than if you use an older system, like hands or steps.
And because of the fact that almost all the world uses the meter as the unit for length, almost all the equations and formulas are written in meters.
Precision: The meter is exactly defined as:
"The length of the path traveled by light in a vacuum in 1/299,792,458 of a second"
So the meter is an exact (and accepted) unit.
Then using this unit for measures of length also provides some " legitimacy" for you measure.
What is a terrestrial planet?
Answer: Hi!
A terrestrial planet is composed of a solid substance like rock or earth. A few examples are our planet, Earth, and the red planet, Mars. These are the planets that are the closest to the sun. There are four terrestrial planets in total. The only known terrestrial planet that has life, however, is our own, Earth! Earth has the perfect conditions for supporting life forms.
Hope this helps!
Answer:
Jupiter
Explanation:
question : Which planet is terrestrial?
Jupiter
Mars
Saturn
Uranus
five factors predisposing a person to stroke
Answer:
the answers maybe→↓
Explanation:
high blood pressure.
cigarette smoking.
diabetes.
high blood cholesterol levels.
heavy drinking.
Answer:
5 factors predisposing a person to stroke:
1). Heart and blood vessel diseases.
2). Family genetics and history.
3). Age.
4). ArterioVenous Malformation (AVM)
5). Overweight and obesity.
PLEASE HELP WILL MARK BRAINLIEST!! I think its c, the mass but I'm not sure. Could someone not only answer but explain?
Several motorboats with the same mass are used in an experiment. The forces of the different motors versus their accelerations are graphed. What is the y-intercept of this graph? (1 point)
the velocity
the inverse of the mass
the mass
zero
Answer:
The answer is going to be ZERO
Explanation:
Let's find relationship
Apply Newton's second law
[tex]\\ \rm\Rrightarrow F=ma[/tex]
[tex]\\ \rm\Rrightarrow Force\propto mass[/tex]
The graph will be a straight line passing through origin so y intercept is 0
The answer answer it it la
Answer:
c) a tube light
Explanation:
a solar panel converts light energy into electricity
a tube light converts electricity into light
Explain how skeletal muscles and nerves work together to help you move
A car accelerates from rest at 5.75m/s2 for 4.4 sec when it runs out of pavement and runs into some mud. In the mud it accelerates to rest at -5.5m/s2. How far did it move from the beginning to the end? Give a variable legend for this problem. The model for this problem?
Answer:
113.85 m
Explanation:
When the car is on the pavement:
v₀ = 0 m/s
a = 5.75 m/s²
t = 4.4 s
Find: Δx and v
Δx = v₀ t + ½ at²
Δx = (0 m/s) (4.4 s) + ½ (5.75 m/s²) (4.4 s)²
Δx = 55.66 m
v = at + v₀
v = (5.75 m/s²) (4.4 s) + 0 m/s
v = 25.3 m/s
When the car is in the mud:
v₀ = 25.3 m/s
v = 0 m/s
a = -5.5 m/s²
Find: Δx
v² = v₀² + 2aΔx
(0 m/s)² = (25.3 m/s)² + 2 (-5.5 m/s²) Δx
Δx = 58.19 m
The total displacement is therefore:
55.66 m + 58.19 m = 113.85 m
Two 100-kg bumper cars are moving toward one another in opposite directions, Car A at 5 m/s meters per second, and Car B at −9 m/s negative 9 meters per second. They collide head-on with one another. Each car bounces back in the opposite direction it was moving before the collision. If after the collision the final velocity of Car B is 5 m/s meters per second, what is the final velocity of Car A?
Answer:
-9ms-1
Explanation:
it will be dat because the initially both are moving at different direction,so for momentum to be conserved they had separate leading to the switching of the two initial velocities
Boston Red Sox pitcher Roger Clemens could routinely throw a fastball at a horizontal
speed of 119.7 m/s. How long did the ball take to reach home plate 17.3 m away?
Answer: 0.145 seconds
Explanation:
Given that Roger Clemens could routinely throw a fastball at a horizontal speed of 119.7 m/s. How long did the ball take to reach home plate 17.3 m away
Since the speed is horizontal
Using the formula for speed which is
Speed = distance/time
Where
Speed = 119.7 m/s
Distance covered = 17.3 m
Time is what we are looking for
Substitute all the parameters into the formula
119.7 = 17.3/ time
Make time the subject of formula
Time = 17.3 / 119.7
Time = 0.145 seconds.
Therefore, it will take 0.145 seconds to reach the home plates
Uma chapa metálica, com um furo central de diâmetro "d", é aquecida dentro de um forno. Com o aumento da temperatura, podemos afirmar: Tanto a chapa quanto o furo permanecem com as mesmas dimensões. O furo permanece constante, e a chapa aumenta a sua dimensão. O furo diminui enquanto a chapa aumenta a sua dimensão. Tanto o furo quanto a chapa aumentam as suas dimensões. O furo diminui enquanto a dimensão da chapa permanece constante.
Answer: O furo diminui enquanto a chapa aumenta a sua dimensão.
(The diameter decreases and the dimensions of the metal increases)
Explanation:
I will answer in English:
Here we have a piece of metal with a small hole on it, that is heated in a hoven.
We know that when a piece of metal is heated, it will expand (the density decreases, so the dimensions of the piece of metal increase).
Now, particularly, the hole will also expand but inwards, as each "extreme" of the piece of metal, will expand into where it has less resistance, so it will expand in the region where there is no material. This "inwards" expansion is why the diameter of the hole will decrease.
Imagine two planets, Planet A and Planet B, in a distant galaxy. Both planets have the same size but Planet A has more mass than Planet B. Two identical spacecrafts land on each of the planets. Which of the statements is true?
The weight of the spacecraft is greater on Planet A but the mass is the same on both planets
The mass of the spacecraft is greater on Planet A but the weight is the same on both planets
Both the mass and the weight are greater on Planet A.
Answer:
The weight of the spacecraft is greater on Planet A but the mass is same on both planets.
Mass is same on both planets because mass is always constant which means it doesn't change when place varies.Weight of the spacecraft is more in planet A because it has more value of acceleration due to gravity. (g=GM/R^2)
Thus the first statement is true
Which of the following is the correct equation we get
when we rearrange a = b *c so that c is by itself on the
right side of the equals sign?
Oa=c
O a + b = c
O a/buc
O a*b = c
Answer:
[tex]\frac{a}{b}=c[/tex] which agrees with the third answer in your list of answer options
Explanation:
Start with:
[tex]a=b\,*\,c[/tex]
divide both sides by b to isolate c on the right:
[tex]\frac{a}{b} =\frac{b\,*\,c}{b} \\\frac{a}{b} =c[/tex]
I have the answer is B but can someone explain why with the rule?
Explanation:
Using Second equation of motion (assuming u = 0), we get :
[tex]x = a {t}^{2} [/tex]
[tex]t = \sqrt{ \frac{x}{a} } [/tex]
Therefore, Option (B) is correct.
The equation for distance is d = st i. If a car has a speed of 22.3 m/s and drives for 8.5 seconds, how far does it go? (1 point)
distance(d) = speed(s) × time (t)
= 22.3 × 8.5
= 189.55m
A 0.40 kilogram bird is flying at a constant speed of 8.0 m/s. What is the bird's kinetic
energy?
Answer:
12.8 J
Explanation:
Kinetic Energy: This can be defined as the energy posses by a body due to its motion. The S.I unit of kinetic energy is Joules(J)
From the question,
Ek = (1/2)mv²........................... Equation 1
Where m = mass of the bird, v = speed of the bird.
Given: m = 0.40 kg, v = 8.0 m/s.
substitute these values into equation 1 above,
Ek = 1/2(0.4)(8²)
Ek = 0.2(64)
Ek = 12.8 J
!!PLEASE HELP ME!!
if you were to fill a graduated cylinder to 250 mL then drop an object in that raises the water level to 300 mL, what is the volume of the object, in cubic centimeters?
A circuit has a current of 2 A. If the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant, what will be the resulting current
Answer:
8AExplanation:
According to ohm's law, V = IR where;
V is the supply voltage (in volts)
I is the current supplied (in amperes)
R is the resistance (in ohms)
Initially, I = 2A, hence V = 2*R;
V = 2R .................... 1
If the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant, then the new resistance will be expressed as R₂ = 1/4 R and V₂ = V
Substituting the new conditions into the ohms law formula, we will have;
V₂ = I₂R₂
I₂ is the resulting new current
V = I₂ (1/4 R)
V = I₂ * R/4
V = I₂R/4 ...... 2
Substituting equation 1 into 2 we will have;
2R = I₂R/4
2 = I₂/4
cross multiply
I₂ = 4*2
I₂ = 8A
Hence the resulting new current is 8A