Answer:
10.6 N
Explanation:
F = ma
8 = m * 4
m = 2 kg
F = 2 * 5.3
F = 10.6 N
Explain how skeletal muscles and nerves work together to help you move
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.
A plastic bottle partially filled with water floats on water, even though the density of the plastic (1.2 g/cc) is more than that of water. Why is that?
Answer:
True the plastic will float because of the principle of flotation or buoyancy
Explanation:
Buoyancy explains it all!!
Buoyancy is the upward force/upthrust experienced by a body immersed totally or partially in a liquid.
According to the principle of flotation:
"when a body is totally or partially immersed in liquid it experiences an upthrust which is equal to the volume of fluid displaced"
The plastic will float due to the fact the average density of the total volume of the plastic and the air inside it is less than the same volume of water it is floating in
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
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
10 POINTS! FIRST TO ANSWER ****CORRECTLY**** GETS BRAINLIEST!
The state of California experiences periodic occurrences of higher than average precipitation. This causes flooding due to heavy rainfall.
Which weather phenomenon most likely causes this and why?
A. La Niña, because of weakening of trade winds
B. El Niño, because of weakening of trade winds
C. El Niño, because of strengthening of trade winds
D. La Niña, because of strengthening of trade winds
Answer:
The answer choice is C because La Nina Is the cooled part of the sea while El Nino is the warmed part of the sea.
Explanation:
You don't need to thank me... : )
A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions. Find the amplitude of the electric field of this light at a distance of 0.400 m from the bulb
Answer:
E = 149.92 N/C
Explanation:
Given that,
The power emitted by a sinusoidal light is 60 W
Intensity is equal to the power per unit area. It can be given by :
[tex]I=\dfrac{P}{4\pi r^2}\\\\I=\dfrac{60}{4\pi \times (0.4)^2}\\\\I=29.84\ W/m^2[/tex]
The relation between the amplitude of the electric field and the intensity is given by :
[tex]I=\dfrac{E_o^2c \epsilon_o}{2}[/tex]
Here, [tex]E_o[/tex] is the amplitude of the electric field
[tex]E_o=\sqrt{\dfrac{2I}{c\epsilon_o}} \\\\E_o=\sqrt{\dfrac{2\times 29.84}{3\times 10^8\times 8.85\times 10^{-12}}}\\E_o=149.92\ N/C[/tex]
So, the amplitude of the electric field is 149.92 N/C.
A hockey puck moves 26 meters northward, then 12 meters southward, and finally 6 meters northward what is the distance and the displacement? PLEASE HELP MEEE
Answer:
The displacement is 20 m northward.
The distance is 44 m
Explanation:
Let northward motion be in positive direction
Let southward motion be in negative direction
Dispalcement is the shortest path covered by the hockey puck at a specified direction.
The dispalcement of the hockey puck will be calculated as;
Displacement = 26 m northward - 12m southward + 6 m northward
Displacement = 20 m in northward direction
Distance is the total path covered by the hockey puck.
Distance = 26 m + 12m + 6 m
Distance = 44 m
Answer:
The displacement is 20 m northward.
The distance is 44 m
Explanation:
2. The ant then travels from the 80.00 cm mark to the 10.00 cm mark. What is the
ant's total distance & displacement?
Answer:
The total distance traveled is 28 inches.
The displacement is 2 inches to the east.
I hope this helps :)
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 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
A snowball that will be used to build a snowman is at the top of a only hill. If the
potential energy of the snowball is 520 J and the mass of the snowball is 2.2 kg,
what is the height of the hill?
Answer:
h = 24.11 m
Explanation:
Given that,
The potential energy of the snowball is 520 J
The mass of the snowball is 2.2 kg
We need to find the height of the hill. The potential energy of an object is given by the formula as follows :
[tex]E=mgh[/tex]
g is acceleration due to gravity
h is height of the hill
[tex]h=\dfrac{E}{mg}\\\\h=\dfrac{520}{2.2\times 9.8}\\\\h=24.11\ m[/tex]
So, the height of the hill is 24.11 m.
1.) Will an objects
motion change if the net
force on the object is
2N? Why or Why not?
Explanation:
Yes, because the object will move to the right
Answer:
Explanation:
Sometimes.
Sometimes not.
If the surface is frictionless, and the mass is 5 kg and the object is on a table, then likely 2 N will be enough to get it going.
If the object is on a table that needs a sandpaper/stain finish, then likely the 5 kg object will not overcome the rough surface of the table and there will likely not be any motion.
If the force is 2N and the object is on a frictionless surface and the object is a 1000kg mass, there might be motion but inertia would certainly be hard to overcome and I doubt there would be motion on planet earth.
2N is just not a very big force.
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.
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
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
To protect her new two-wheeler, Iroda Bike
buys a length of chain. She finds that its
linear density is 0.83 lb/ft.
If she wants to keep its weight below 1.4 lb,
what length of chain is she allowed?
Answer in units of ft.
Answer:
The length of chain she is allowed is 1.169 ft
Explanation:
The given parameters are;
The linear density of the chain = 0.83 lb/ft
The weight limit of the chain she wants = 1.4 lb
The formula for linear density = Weight/length
Therefore, in order to keep the chain below 1.4 lb, we have;
Linear density = Weight/length
Therefore;
The maximum length she wants = Weight/(Linear density)
Which gives;
The maximum length she wants = 1.4 lb/(0.83 lb/ft) =1.169 ft
Therefore;
The length of chain she is allowed = 1.169 ft.
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!
How much work is done (in L*atm) by a gas that expands from 7.6 liters to 24 liters against an external pressure of 3.4 atm?
Answer:
The work done by the gas is 55.76 L*atm.
Explanation:
The work can be found as follows:
[tex] W = p\Delta V = p(V_{f} - V_{i}) [/tex] (1)
Where:
p: is the pressure = 3.4 atm
V(f): is the final volume = 24 L
V(i): is the initial volume = 7.6 L
By replacing the above values into equation (1) we have:
[tex]W = p(V_{f} - V_{i}) = 3.4 atm(24 L - 7.6 L) = 55.76 atm*L[/tex]
Therefore, the work done by the gas is 55.76 L*atm.
I hope it helps you!
A coil of wire is connected to a galvanometer and the north end of a magnet moved towards the center of the coil causing the needle on the galvanometer to deflect. If the south pole of a magnet is moved away from the center of the coil the needle on the galvanometer would deflect in the same direction.
a. True
b. False
Answer:
a. True
Explanation:
In electromagnetic induction, the induced current always try to oppose the action that produces the induction (Lenz law). The approaching north end of the magnet will induce a current on the coil that will flow in an anticlockwise direction in the current (which induces a magnetism with the equivalent of a north pole of a magnet). The action of this induced current repels the magnet, in an effort to stop the motion that is producing the electromagnetic induction. When we also move the south pole of the magnet away from the coil, it induces an anticlockwise current in the coil, which tries to attract the south pole of the magnet so as to prevent it from moving. So both actions produce currents that flow in the same direction, which means that the needle of the galvanometer will deflect in the same direction.
Answer:
a. True
Explanation:
In electromagnetic induction, the induced current always try to oppose the action that produces the induction (Lenz law). The approaching north end of the magnet will induce a current on the coil that will flow in an anticlockwise direction in the current (which induces a magnetism with the equivalent of a north pole of a magnet). The action of this induced current repels the magnet, in an effort to stop the motion that is producing the electromagnetic induction. When we also move the south pole of the magnet away from the coil, it induces an anticlockwise current in the coil, which tries to attract the south pole of the magnet so as to prevent it from moving. So both actions produce currents that flow in the same direction, which means that the needle of the galvanometer will deflect in the same direction.
The bottle's mass is 0.2 kg. The diameter of its base is 10cm. How much pressure does the bottle exert on the table? A) 64 Pa B) 25 Pa C) 6.4 Pa D) 255 Pa
Answer:
D) 255pa
Explanation:
pressure= force/area
force = weight
weight= mass* gravitational acceleration
weight= 0.2kg*10m/s²
weight= 2N
area= πr² where r=1/2diameter
r=1/2diameter
r=1/2(10cm)
r=5cm or 0.05m
area= πr². where π 's approximate value is 3.14
area=3.14(0.05m)²
area=3.14 * 0.0025m²
area=0.00785m²
pressure= force/area
pressure=2N/0.00785m²
pressure=255pa approximately
Answer:
d 255 Pa
Explanation:
If friction is ignored and the ball is dropped, it experiences a gain in ____ and a decrease in ___. Question 8 options: kinetic energy; potential energy potential energy; kinetic energy thermal energy; potential energy potential energy; thermal energy
Answer:
My answer is when the ball is going it experience kinetic energy which is the energy of a moving object while when the ball has stopped then it will have potential energy which means it's at rest so for the ball not to experience friction then there is a gain in kinetic energy and decrease in potential energy.
Answer:
Gain in Kinetic energy and decrease in Potential energy.
Explanation:
What is kinetic energy ?The energy possessed to a body due to its motion is called kinetic energy.
K = [tex]\frac{1}{2} .m.v^{2}[/tex]
What is potential energy ?The energy possessed to a body due to its position is called potential energy.
[tex]U =mgh[/tex]
As the falls , due to pull of the Earth its velocity increase thus its kinetic energy also increases .As it falls , its height decrease from the Earth thus potential energy decrease.Hence in free fall , the ball experiences gain in kinetic energy and decrease in potential energy.
https://brainly.com/question/11749818
#SPJ2
1500 + 30.4 = ? Use the correct number of significant figures. plz plz help me
Answer:
1530.4?
Explanation:
1500.0
+030.4
1530.4
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.
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
A boy rolls a toy car across a floor with a velocity of 3.21 m/s. How long does it take the car to travel a distance of 4.50 m?
Answer:
Time taken for the car to travel a distance of 4.50 m = 1.40 seconds
Explanation:
velocity of toy car = 3.21 m/s
distance travelled by toy car = 4.50 m
Time = ?
[tex]Velocity = \frac{Distance}{Time} \\Time =\frac{Distance}{Velocity}[/tex]
[tex]Time = \frac{4.50}{3.21} \\Time = 1.40s[/tex]
Therefore, the time taken for the car to travel a distance of 4.50 m = 1.40 seconds
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
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
A cross-country skier moves 36 meters eastward, then 44
meters westward, and finally 22 meters eastward.Whats the Magnitude and Direction?
Answer:
Magnitude = 14 metres
Direction = eastward.
Explanation:
A cross-country skier moves 36 meters eastward, then 44meters westward, and finally 22 meters eastward.
Whats the Magnitude and Direction?
The magnitude and direction will be the displacement of the cross country skier.
Let the east ward be positive and the west ward be negative.
Since the skier moves 36 meters eastward, then 44meters westward, and finally 22 meters eastward. Then, that will be:
36 - 44 + 22 = 14
Since the answer is positive, the magnitude is 14 and the direction is east ward.
Which statement is true about acceleration?
Ο Α.
It is the rate of change of speed per unit time.
B.
It is the rate of change of displacement per unit time.
O C.
It is the rate of change of velocity per unit time.
O D.
It is the rate of change of position per unit time.
Answer
A
Explanation:
It is the rate of change of speed per unit time