Answer:
Distance the boat would travel going upstream = 160 km
Explanation:
First, the time of travel of the boat downstream is calculated.
Time of travel = distance/speed
distance = 240 km;
speed of travel = 40 + 8 = 48 km/h ( since the boat is going downstream)
Time = 240/48 = 5 hours
Therefore, the boat travels for 5 hours.
The distance the boat will travel in 5 hours going upstream is then calculated
distance = speed * time
speed of boat going upstream = 40 - 8 = 32 km/h
Distance = 32 km/h * 5 hours = 160 km
What are the reactants in the reaction? What are their properties?
In a reaction, reactants are the substances on which the reaction takes place. The reactants undergo changes to form the products.
In any reaction, the atoms of the reactants and the products are the sameThe only difference is the way these atoms are bound to each other through chemical bondsDuring the reaction, there is a rearrangement of the atomsConsider the following reaction:
C + O₂ ---> CO₂
In the above reaction, carbon and oxygen are the reactantsWe can see that the atoms on both sides of the reaction are the same, the only difference is the way they are bondedCarbon undergoes combustion and reacts with oxygen gas to form carbon dioxide gasLearn more about chemical reactions here:
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please help 25 points!
Select the following statements that apply to velocity.
a. Velocity is a vector quantity.
b.Velocity is a scalar quantity.
c. Velocity is the same thing as speed.
d.Velocity is speed with net force.
e. Velocity is speed with direction.
a) Velocity is a vector quantity
e) Velocity is a speed with direction
=================================================
Explanation:
If we know the velocity of an object, then we know how fast it's going (speed) and where it's going (direction). It is a vector because the direction of the vector determines the direction, and the length of the vector (aka magnitude) determines the speed. So in a sense we've built in two facts of data into one visual.
An example of velocity: 10 miles per hour north. Here we have the speed of 10 mph and the direction north.
-------------------
Extra info:
Choice B contradicts choice A, so we can cross choice B off the list.Choice C is false because speed is a scalar, or single quantity, and not a vector. As mentioned earlier, speed is a part of velocity, but they aren't the same exact thing. Choice D is false because the velocity does not account for net force. We don't have any force information built into the velocity.a. Velocity is a vector quantity.
b.Velocity is a scalar quantity. NOT
c. Velocity is the same thing as speed. NOT
d.Velocity is speed with net force. NOT
e. Velocity is speed with direction.
An object moving with constant acceleration changes speed from 20 mi./s to 60 mi./s in 2.0 seconds what is the acceleration
The question is “Which direction will the airplane move” plz help :,)
From the information in the picture, it's not possible to select any of the choices on the list.
-- Knowing the horizontal and vertical forces on the plane, we can't tell what direction it will move. We can only tell what direction it will accelerate.
The net horizontal force is (200N right) - (50N left).
. . . That's 150N to the right, so the plane accelerates to the right.
The net vertical force is (175N up) - (75N down).
. . . That's 100N upward, so the plane accelerates upward.
-- We can't tell the compass direction of the net force, because the picture doesn't tell us the compass direction of the horizontal forces.
L. An arrow is shot at 35° above the horizontal. Its velocity is 52 m/s and it hits the target.
a. What is the horizontal velocity? (Show Work!)
Answer:
The horizontal component of the velocity is approximately 42.6 m/s
Explanation:
The given parameters are;
The speed of the arrow when it was shot = 52 m/s
The angular direction in which the arrow was shot, θ = 35° above the horizontal
The horizontal component of the velocity is found by the resolution if the velocity vector into its components as follows;
The horizontal component of the velocity = Velocity in the x-direction = vₓ
vₓ = v × cos(θ) = 52 × cos (35°) ≈ 42.6 m/s
vₓ = The horizontal component of the velocity ≈ 42.6 m/s
Water flows into a swimming pool at the rate
of 5.25 gal/min.
If the pool dimensions are 33.8 ft wide, 40 ft
long and 11.1 ft deep, how long does it take to
fill the pool? (1 gallon = 231 cubic inches)
Answer in units of min.
Answer:
t = 12.37 [min]
Explanation:
In order to solve this problem we must first convert units of gallons to cubic feet.
[tex]V = 5.25\frac{gal}{min}*231\frac{ft^{3} }{1gal} \\V = 1212.75[\frac{ft^{3} }{min} ][/tex]
where:
V = volumetric flow = 1212.75 [ft^3/min]
And the volume of the pool can be calculated as follows :
v = 33.8*40*11.1 = 15007.2 [ft^3]
The volumetric flow is equal to:
V = v/t
where t is the time
t = v/V
t = 15007.2/1212.75
t = 12.37 [min]
Pretest: Waves
18
Select the correct answer.
Which type of wall would make the best soundproofing for room?
OA.
1.0 centimeter thick glass
OB.
two layers of 0.5 centimeter thick glass with 0.5 centimeters of air between them
OC.
two layers of 0.5 centimeter thick glass with 0.3 centimeters of vacuum between them
OD.
1.0 centimeter thick steel
If an astronaut has a mass of 16 Kg on Earth, what would be his mass on the moon and on the space station
Answer:
The astronaut's mass is 16 kg.
Explanation:
Mass can be defined as a measure of the amount of matter an object or a body comprises of. The standard unit of measurement of the mass of an object or a body is kilograms.
Irrespective of the location of an object or a body at a given moment in time, the mass (amount of matter that they're made up of) is constant. This ultimately implies that, whether you're in the moon, space, earth or any other place, your mass remains the same (constant).
Therefore, if an astronaut has a mass of 16 Kg on Earth, his mass on the moon and on the space station would remain the same, as his original mass of 16 Kg because mass is indestructible.
An airplane flies with a constant speed
of 720 km/h. How far can it travel in
3 hours
Answer:
2160 km/h
Explanation:
720 times 3 gives you the answer
joseph is walking to his class at 2 mps his class is 46 meters away. how long will it take joseph to walk to class
PLEASE HELP!!! ILL GIVE BRAINLYEST!!
The Law of Conservation of Matter describes how mass is not lost during a chemical reaction.
True
False
Answer:
i think its false
explanation
Which type of wave is not reflected by the ionosphere?
Answer:
skip zone
Explanation:
ILL GIVE BRAINLY THING
Tom has been hired to deliver 11 m3 of sand. If the truck that Tom is driving has a truck bed that is 2.5 m X 1.6 m, X 0.75 m how many trips will Tom need to complete the order?
PLS GO TO MY PROFILE TO SEE THE OTHER QUESTIONS I POSTED I GIVE BRAINLY THING FOR THOSE AS WELL THANK YOU
Answer:
About 3 trips
Explanation: if we do 2.5m*1.6m*0.75 it equals to 11000 then we divide that to 11m3 and it gives you 3.6 so it will be about 3 times
Thx
PLEASE HELP!!!! ILL MARK BRAINLYEST!!
A change in the size or shape of a substance is a _________ change
A. chemical
B. physical
C. material
D. nuclear
You were in a tog-o-war contest which your team won. Write a letter to your friend that tells why your team won the contest. Remember to include unbalanced forces and net force.
Answer:
Imagine a tug-of-war between you and one
friend. If you are stronger, you apply more
force to the rope. You pull your friend across
the line, and you are the winner! If your friend
is stronger, he might pull you across the line.
Sometimes the forces are equal. Neither you
nor your friend moves across the line. The two
forces are balanced.
3
We say that the net force on an object is the combination of all the forces acting on it. To find the net force of
forces that are acting in the same direction, add them together. For example, if you pull on a box with a force of 25
newtons (N) while your friend pushes the box (in the same direction you are pulling) with a force of 30 N, the net
force applied to the box in that direction is 55 newtons.
4
To find the net force of forces that are acting in opposite directions, subtract the smaller force from the larger
one. If you are pulling on a tug-of-war rope with a force of 40 N, and your friend is pulling with a force of 35 N in
the opposite direction, the net force on the rope is 5 newtons in your direction. You win!
Explanation:
My team won the thug of war contest because we exerted a greater net force than the opponent team.
The letter requested is an informal letter. The letter opens with a heading which contains the writers' address and date.
Universal Model School,
90 Aba Owerri Road,
Aba.
October 22, 2021.
Next is the salutation, for example;
Dear Chris,
Next is the body of the letter, you can begin the first paragraph by asking after his welfare and that of his family and studies.
In the second paragraph, you can let him know that the reason for motion is the action of unbalanced forces. In the thug of war game, each side exerts a force. The team that wins is the team that exerts a greater net force causing the cord to move towards their own side.
The conclusion should have such words as;
Yours Truly,
Your name
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Which of the following is a molecule? *
1.He
2.Be
3.NO
4.Na
The modern periodic table is organized by:
atomic number
atomic mass
chemical name
chemical symbol
The air inside a room is at a temperature of 35°C and has a mixing ratio of 7.6 g/kg. a) What is the relative humidity? % b) What is the dew point? °C c) If the room temperature decreases by 5°C per hour, how many hours will it take for the air to reach saturation? hours d) After reaching saturation, if the temperature of the room continues to decrease for one more hour, approximately how many grams of water vapor (per kg of air) will ahve had to condense out of the air to maintain a relative humidity of 100%? g/kg
Answer:
(a). The relative humidity is 20.57%
(b). The dew point is 79.114°F
(c). It take for the air to reach saturation is 17 hours.
(d). The water is 7.6g/kg.
Explanation:
Given that,
Temperature = 35°
Mixing ratio = 7.6 g/kg
(a). We need to calculate the relative humidity
Using formula of relative humidity
[tex]relative humidity=\dfrac{mixing\ ratio}{36}\times100[/tex]
[tex]relative humidity=\dfrac{7.6}{36.94}\times100[/tex]
[tex]relative humidity=20.57\%[/tex]
(b). We need to calculate the dew point
Using formula of dew point
[tex]dew\ point=T^{\circ}F-\dfrac{(100-relative\ humidity)}{5}[/tex]
Put the value into the formula
[tex]dew\ point=95-\dfrac{100-20.57}{5}[/tex]
[tex]dew\ point=79.114^{\circ}F[/tex]
(c). If the room temperature decreases by 5°C per hour
We need to calculate the time
Using formula of time
[tex]t=\dfrac{T_{a}-increase\ temperature}{5}[/tex]
Put the value into the formula
[tex]t=\dfrac{95-10}{5}[/tex]
[tex]t=17\ hours[/tex]
(d). If the temperature of the room continues to decrease for one more hour,
We need to calculate the how many grams of water vapor
Using given data
The water of 7.6g/kg vapour will have to condense out of air for the maintain relative humidity at 100%
Hence, (a). The relative humidity is 20.57%
(b). The dew point is 79.114°F
(c). It take for the air to reach saturation is 17 hours.
(d). The water is 7.6g/kg.
Answer:
temp: 35° c (95°f)
MR:7.6
SMR: 36.5
RH: 21% (20.82)
Dew Point: 10° C
5°c per hour: 5 hours for the 35°c air temp to reach the 10°c dew point
1 more hour: Temperature will decrease to 5°c, half the water molecules dewpoint "size" I view it as, and 3.8g/kg of water vapour has condensed out
so
1. 21%
2. 10° C
3. 5 hours
4. 3.8g/kg
Why doesn’t the sugar cross the cell membrane and diffuse the way the way does?
Answer:
Although glucose can be more concentrated outside of a cell, it cannot cross the lipid bilayer via simple diffusion because it is both large and polar. To resolve this, a specialized carrier protein called theglucose transporter will transferglucose molecules into the cell to facilitate its inward diffusion.
Explanation:
Please mark as brainlist answers.
A tortoise and a hare are having a 1,000-meter race. The tortolse runs the
race at a constant speed of 0.023 m/s. The hare moves at an average speed
of 1.50 m/s for 10.0 minutes and then decides to take a nap. After waking up
from the nap, the hare recognizes that the tortoise is about to cross the
finish line and immediately accelerates from rest with a constant acceleration
of 0.500 m/s2 for the remaining distance of the race. If both racers finish
simultaneously, what is the time in hours that the hare napped?
Answer:2 hours
Explanation:
PLEASE HELP ME FAST!
Which of these sentences best illustrates visualization using a sequence of events? A. The earthquake sent out a shock waves in all directions. The sea surface is disturbed also. Big waves are formed. These waves travel fast across the sea. They are dangerous and can kill. B. Then, all of a sudden, a strong earthquake strikes off the coast of Alaska, deep down on the seafloor. After this, the seafloor moves up and down. Next the walls and floors of the house is suddenly start to shake. C. Both A and B. D. Neither A or B.
Answer:
Explanation:
C. Both A and B I guess
Answer:
its b
Then, all of a sudden, a strong earthquake strikes off the coast of Alaska, deep down on the sea floor. After this, the sea floor moves up and down. Next, walls and floors of the houses suddenly start to shake.
Explanation:
mark me brainleist please!
also i really hope this helps and have a really good day
-TA
You throw a basketball and a tennis ball across the classroom so that each ball has the exact same momentum. Explain how this is possible given that a basketball has more mass than a tennis ball.
Answer:
It is possible by increasing the speed of the tennis ball by a factor of (Mass of the tennis ball)/(Mass of the basketball)
Explanation:
The momentum of a body = The bod's mass × The body's velocity
Therefore, the momentum of a given mass of an object, such as a tennis ball can be increased by increasing the velocity or speed of the object. Whereby the speed of the ball, v₁, is increased such that the momentum of the basketball and the tennis ball will be the same, is given by the following equation
Mass of the basketball × v₂ = Mass of the tennis ball × v₁
Therefore, v₁/v₂ = (Mass of the tennis ball)/(Mass of the basketball)
Jared would describe a square as having four equal sides and four right angles. This is Jared’s __________ of a square. A. model B. hierarchy C. feature D. concept Please select the best answer from the choices provided A B C D
Answer:
d
Explanation:
Jared would describe a square as having four equal sides and four right angles. This is Jared’s conceps of a square.
What are squares?A square has four equal sides, four vertices, and is a closed, two-dimensional object. It has parallel sides on either side. A square is also equivalent to a rectangle with equal length and width.
Many objects can be found in your surroundings that have a square shape. The chessboard, craft sheets, bread slice, picture frame, pizza box, wall clock, etc. are typical instances of this shape.
A square is a two-dimensional closed shape with 4 equal sides and 4 vertices. Its opposite sides are parallel to each other. We can also think of a square as a rectangle with equal length and breadth.
Therefore, Jared would describe a square as having four equal sides and four right angles. This is Jared’s conceps of a square.
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plants have organelles called
Answer:
chloroplasts
Explanation:
Plants have chloroplasts which are plastids that contains chlorophyll and photosynthesis takes place.
What was the first iphone
Answer:=Phone 2G
Explanation:
Answer:
model=A1203
Explanation:
it was the first iPhone invented by apple sync
If a 100n force has a 60-degree angle pulling on a 10kg block for 5m, what's the work done on the object
Answer:
250J
Explanation:
Given parameters:
Force on block = 100N
Degree of pull = 60°
Mass of block = 10kg
Distance = 5m
Unknown:
Work done on the object = ?
Solution:
The workdone on a body is the force applied to move a body in a specific direction;
Workdone = force x distance cos Ф
Insert the parameters and solve;
Workdone = 100 x 5 cos 60°
Workdone = 250J
Brady connected the lose wire to the battery and created an electromagnet as shown below. He picked up 45 thumb tacks with his electromagnet, though his goal was to pick up 50 thumb tacks. What could Brady do to increase the strength of his electromagnet and pick up more thumbtacks?
Answer:
He will have to use two batteries instead of just one.
Explanation:
The way Brady could increase the strength of his electromagnet and pick up more thumbtacks is for him to increase the current. He can achieve this either by adding a second battery or by adding more coils of wire.
This is because using 2 batteries will make the amount of current in the coils to increase and this will in turn produce a higher electromagnetic field in the nail.
Riding your skateboard, it takes 12 seconds to speed up from 2 m/s to 8 m/s. Find the acceleration.
The vector V is at a 72° angle and has a magnitude of 12.
Describe this vector using vector notation (Use the & and symbols.) (6 points)
Question 9
What is the angle of the vector described below? (3 points).
Please answer all questions will mark brainliest and give 5 stars
V=2x+3y
Answer:
Part 1
The vector can be expressed as follows;
r = 12, θ = 72°, ·v = (12, ∠72°), ·v ≈ 3.71·[tex]\mathbf{\hat i}[/tex] + 11.41·[tex]\mathbf{\hat j}[/tex] or
[tex]\mathbf{\cdot v}=\begin{bmatrix}3.71\\ 11.41\end{bmatrix} = \begin{pmatrix}3.71\\ 11.41 \end{pmatrix}[/tex]
Part 2
The angle of the vector is 56.31°
Explanation:
Part 1
The given parameters are;
The direction of the vector = 72°
The vector magnitude = 12
Therefore, the vector can be described in the following forms;
Polar form
1) Direct notation;
r = 12, θ = 72°
2) Ordered set
·v = (12, ∠72°)
Rectangular vector notation;
1) Unit vector notation
·v = vₓ[tex]\mathbf{\hat i}[/tex] + [tex]v_y[/tex][tex]\mathbf{\hat j}[/tex]
Where;
vₓ = 12 × cos(72) ≈ 3.71
[tex]v_y[/tex] = 12 × sin(72) ≈ 11.41
Therefore;
·v ≈ 3.71·[tex]\mathbf{\hat i}[/tex] + 11.41·[tex]\mathbf{\hat j}[/tex]
2) Matrix notation
[tex]\mathbf{\cdot v}=\begin{bmatrix}3.71\\ 11.41\end{bmatrix} = \begin{pmatrix}3.71\\ 11.41 \end{pmatrix}[/tex]
Part 2
The given vector is V = 2·x + 3·y
Therefore, the angle of the vector, θ = tan⁻¹(y/x) = tan⁻¹(3/2) ≈ 56.31°
The angle of the vector = 56.31°.
HURRY PLEASE!!!
Which of the following demonstrates the result of waves traveling at
different speeds when moving from one medium to another?
A. The absence of any sound in outer space
B. The bending of light as it moves from air to water
C. The movement of ocean currents as the earth rotates
D. The up and down motion of a collided metal spring
Answer:
B.
Explanation:
The one that demonstrate the result of waves traveling at different speeds when moving from one medium to another is the bending of light as it moves from air to water. The correct option is B.
What is bending of light?Even though waves travel at different speeds through different mediums, light bends or is refracted as it travels from one medium to another.
The degree to which it bends is referred to as the index of refraction. Light bends more as the index of refraction increases.
The change in direction of waves that occurs when they travel from one medium to another is referred to as refraction.
Refraction is always accompanied by a change in wavelength and speed. The bending of waves around obstacles and openings is known as diffraction.
The bending of light as it moves from air to water is an example of the result of waves traveling at different speeds when moving from one medium to another.
Thus, the correct option is B.
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