Answer:
SF4 + 3H2O → H2SO3 + 4HF
Explanation:
I found it
Which of the following describes a physical change? A. A marshmallow burns over an open flame. B. Icicles melt from a rooftop. C. A cat eats a piece of fish. D. Milk turns sour.
Answer:
B
Explanation:
Icicles melt from a rooftop
Placing ice on a sprained ankle this is an example of conduction, convection, radiation?
In a drill during basketball practice, a player runs the length of the 30-meter court and back. The player does this three times in 60 seconds. The magnitude of the player's average velocity during the drill is...
1. 0 m/s
2. 0.5 m/s
3. 1 m/s
4. 1.5 m/s
5. 3 m/s
6. 30 m/s
Answer:
3.0m/s so it’s number 5
Explanation:
The magnitude of the player's average velocity during the drill is 0 m/s.
The given parameters;
length of the court, L = 30 mnumber of times, = 3time of motion, t = 60 sAverage velocity is change in displacement per change in time of motion.
[tex]\Delta \bar v = \frac{\Delta x}{\Delta t}[/tex]
where;
[tex]\Delta x[/tex] is the change in displacementThe change displacement is zero, since the player moved forward and back to the exact initial position.
[tex]\Delta \bar v = \frac{3(30) - 3(30) }{60} = 0[/tex]
Thus, the magnitude of the player's average velocity during the drill is 0 m/s.
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2. Kymel is competing to see who is the fastest runner on the football team. Kymel uns
from rest to a speed of 4 m/s when he reaches the 20 meter mark in just 2 minutes.
What was Kymel's acceleration during the run?
a. 2 m/s2
b. 30 m/s2
c. 0.5 m/s2
d. 0.03 m/s2
PsX
Answer:
3
Explanation:
I just really need points man sorry
33. A zebra is at rest 60 m away from a charging lion
running at 20 m/s. If the zebra accelerates at 4
m/s2, will the lion catch it?
Answer:
the lion will miss the zebra by 3 meters
Explanation
The zebra has gone 23.75m after 5 seconds
and the lion can only go 20 m/s
The lion can not catch zebra.
A diagram is attached below which describe situation of question.
The speed of Zebra is,
[tex]v=u+at=0+4t=4t[/tex]
Where u is initial speed of zebra.
The speed of lion is 20m/s.
The lead in speed by lion for every second is [tex](20-4t)[/tex].
[tex](20-4t)*t=60\\\\20t-4t^{2}=60\\ \\t^{2}-5t+15=0\\ \\t=\frac{5\pm\sqrt{(-35)} }{2}[/tex]
Here time is imaginary.
Therefore, The lion can not catch zebra.
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Which statement best defines work.
A) Work is the time it takes to move an object once acted upon by a force
B) Work occurs when balanced forces act on a object and cause movement in the direction of these forces
C) Work occurs when a force causes motion of an object, and this motion is the same directional the applied force
D) Work is the distance over time that an object moves once acted on by a force
Scientific notation 47,000
47,000 written as 4.7 x 104 in s scientific notation
How can parallax allow us to determine the distance to a star
Answer:
Astronomers use a method similar to the one you used with your homemade quadrant. Twice the distance to the Sun, divided by the distance to the star (which is unknown so far) is equal to the tangent of the parallax angle of the star.
how does light spectra help us understand astronomy
Answer: From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star.
Explanation: The spectral line also can tell us about any magnetic field of the star. The light from the stuff between the stars allows astronomers to study the interstellar medium.
Hope this helps! :)
help me guyzz plzz.......
answer:
1.When an electric current is passed through a conductor, the conductor becomes hot after some time and produce heat. This happens due to the conversion of some electric energy passing through the conductor into heat energy. This effect of electric current is called heating effect of current.
2.As per the law of combination of resistances in series,
R=R1 +R2 +R3+R4+R5
R=0.2+0.2+0.2+0.2+0.2
=1ohm
3.power is amount of electrical energy consumed per unit time. Amount of power consumed in a device is proportional to the current flowing in the device. The unit of electric power is watt.
What is the velocity of a car that travelled a total of 75 km north in 1.5 hrs?
List 3 objects that would sink in water & 3 object that would float in water :)
Answer:
items that would sink : spoon marbles rocks
Explanation:
items that would float : straw feather cotton
how long would it take to get to the moon going around 75 miles an hour
help me please asap :(
A 0.142 kg baseball on a 0.8 meter table has 1.11 J of potential energy. It falls. How much kinetic
energy, in Joules, will it have on the way down when it reaches a height of 0.25 meters? Assume
mechanical energy is conserved.
Answer:
0.04544 J
Explanation:
KE= 1/2 the mass times V squared
KE=1/2(0.142) * (0.8)^2
KE= 0.071 * 0.64
KE=0.04544
When you ride your bike around a corner at 10 m/s, you are accelerating?
When you ride your bike around a corner at 10 m/s, you are accelerating. Acceleration is caused by any forces. Sliding friction keeps you in the seat when a car goes around a corner. If you throw a ball into the air, Earth exerts a force on the ball.
Answer:
yes because acceleration is a vector quantity and as u turn around a corner you are changing direction.
Explanation:
a 0.11kg moving hockey puck is caught by a 80kg goalie who then slides on the frictionless ice at 0.076 m/s. What was the initial velocity of the hockey puck
Answer:
55mph
Explanation:
a 0.11kg moving hockey puck is caught by a 80kg goalie who then slides on the frictionless ice at 0.076 m/s. the initial velocity of the hockey puck was 55mph
what is velocity ?Velocity is a parameter which can be defined as the rate at which the object change the position with respect to time, basically speeding the object in a specific direction.
It is a vector quantity which shows both magnitude and direction and The SI unit of velocity is meter per second (ms-1). the change in magnitude or the direction of velocity of a body, then it is said to be accelerated.
Finding the total velocity is simple but few calculations and basic conceptual knowledge are needed.
For more details regarding velocity, visit
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What was the main aim behind Wegener's continental drift theory?
A. To explain major climate changes
B. To explain geological similarities
C.to explain landforms of area
D. All of the above
How many different relationships do the great white sharks have? (Science)
Answer:
three symbiotic relationships
The great white shark has each of the three symbiotic relationships. It has a commensalistic relationship with the remora because the remora cleans the shark's body and the shark is unaffected. It has a Parasitic relationship with the germ ommatokoita elongata because the germ is benifited and the shark is harmed.
plz mark brainliest
Help help help help help
An observer is standing next to the tracks, watching a train approach. The train travels at 30 m/s and blows its whistle at 8,000 Hz as it approaches and then passes by the observer without slowing down. Assuming the speed of sound is 340 m/s, how much of a frequency change did the observer hear?
Answer:
The frequency heard by the observer will be "7351.35 Hz".
Explanation:
The given values are:
Source,
[tex]V_s=30 \ m/s[/tex]
Frequency of source,
[tex]F_s=8000 \ Hz[/tex]
Speed of sound,
[tex]C=340 \ m/s[/tex]
As we know,
⇒ [tex]F=(\frac{C+V_r}{C+V_s} )F_s[/tex]
Here,
[tex]V_r=0[/tex]
So that the formula will be:
⇒ [tex]F=(\frac{C}{C+V_s} )F_s[/tex]
[tex]=\frac{340}{340+30}\times 8000[/tex]
[tex]=7351.35 \ Hz[/tex]
Giving brainliest!
1. Use Newton’s Laws to explain why an object in space that has no motion has to be shoved to move in the first place.
2. Use Newton’s Laws to explain why a bowling ball will slow down and stop when rolled on a flat surface, like a street.
3. Use Newton’s Laws to explain why, when a 100Kg astronaut throws a 9Kg bowling ball forward in space, she moves backward but slower.
Answer:
An object in space that has no motion has to be shoved to move in the first place because of newton's first law of motion. A bowling ball will slow down and stop when rolled on a flat surface, like a street because of rolling friction which comes under Newton's first law of motion. When a 100Kg astronaut throws a 9Kg bowling ball forward in space, she moves backward but slower, this is because of Newton's third law of motion.Explanation:
This is due to Newton's first law of motion, explaining that an object in space that has no movement has to be moved to move in the first place. There is no external force or gravitational force in space, so the body can stay at rest and be forced to move first. Explaining why a bowling ball, like a street, can slow down and stop when rolled on a flat surface. This, again, is attributed to Newton's first law of motion. Due to rolling friction, it happens. The electrons on the surface of the ground in the atoms push against the electrons that touch the ground in the atoms on the surface of the ball as you roll a ball on the ground. A rolling ball stops when the surface on which it rolls opposes its motion. A ball rolling, due to friction, ceases.Explaining that when a 100 kg astronaut throws a 9 kg bowling ball forward in space, she travels backward but slower, due to Newton's third motion rule , which states that when force is applied, each body exhibits equal and opposite reaction. In this case, the astronaut's mass is greater, so the ball's acceleration will be less than the astronaut 's mass (since the body's mass is inversely proportional to the acceleration). Therefore, because of the reverse direction and slowly because of no gravitational force in space, the girl shifts backward while tossing the ball forward in space.Newton's Law of Motion -
FIRST LAW - The first law of Newton states that if a body is at rest or moving in a straight line at a constant speed, it will stay at rest or continue to travel at constant speed in a straight line unless it is acted upon by a force.
SECOND LAW - The second law of Newton is a quantitative explanation of the changes that a force can cause in a body 's motion. It states that the rate of change of a body's momentum in time is proportional to the force exerted on it in both magnitude and direction.
THIRD LAW - The third law of Newton notes that they apply forces to each other when two bodies interact, which are equal in magnitude and opposite in direction. Often known as the law of action and reaction, the third law is. In analyzing static equilibrium problems, where all forces are balanced, this law is essential, but it also applies to bodies in uniform or accelerated motion.
Hence , all the three explainations consist of newton's first and third laws of motion.
Have you ever wondered how a vending machine "knows" that you have put in the correct amount of change to purchase a snack or a drink? These machines use coin detectors that determine the mass and the size of the coins deposited. In other words, they analyze the density of the coins. United States coinage is minted within very narrow specifications, so the density of each type of coin is always the same. The coin detectors compare the coins inserted to the preset standards to determine if the correct combination of coins has been deposited. In this lesson, you too will determine the density of various coins. OBJECTIVES Recognize the characteristics of density. Design and carry out a scientific investigation. Present your findings in a scientific report. Online Lab This animation will allow you to find the density of a penny, a nickel, and a quarter. Make a hypothesis in which you suggest which coin will have the highest density and which will have the lowest density. A model hypothesis might be: "If the (fill in the name of a coin) has a greater density than the _____ and _____, then it will have a greater mass to volume ratio. If the (fill in the name of a coin) has a lower density than the _____ and _____, then it will have a lower mass to volume ratio. Remember to record your data and observations in the data sheet so that you can use them to present your findings. SHOW TRANSCRIPT Present Your Findings Write a one or two summary paragraph discussing this experiment and the results. Use the following questions and topics to help guide the content of your paragraph. According to your data, was your hypothesis correct? (Be sure to refer to your data when answering this question.) Summarize any difficulties or problems you had in performing the experiment that might have affected the results. Describe how you might change the procedure to avoid these problems. List at least two real world examples that apply the findings of this experiment. (Hint: An example of this type was given in the introduction to this project.) What would you like to do next?
Answer:
If the Quarter has a greater density than the nickel and penny, then it will have a greater mass to volume ratio.
Explanation:
sorry thats all i can help with!
PLEASE HELP
What is an archimedean screw used for?
dont just guess or i wil banned you and reprt you actually try
Archimedes screw, machine for raising water, allegedly invented by the ancient Greek scientist Archimedes for removing water from the hold of a large ship.
Answer:
To move things from a lower level to a higher level.
Explanation:
how many current can absorb human body
Answer:
about 10 milliamperes
Explanation:
currents above 10ma can paralize or "freeze bodies"
If this woman pushes down on her lever with a force of 25N and the rock moves with a
force of 100N, what was the mechanical advantage?
Answer:
0.25
Explanation:
When do two different position-time graphs have
matching velocity-time graphs?
Answer:
when they have the same slope
What are positive relationships of the great white shark called?
Answer:
parasitic relationship, mutualistic relationship, and the commensalistic relationship
Explanation:
those are what they are called
A dolphin swims 1.85 km/hr how far has the dolphin traveled after 0.6 hours
A 1.11km
B 3.08km
C 0.32km
D 1.85km
Answer:
The answer is option AExplanation:
In order to find the distance covered we use the formula
distance = velocity × timeFrom the question
velocity = 1.85 km/hr
time = 0.6 hours
We have
distance = 1.85 × 0.6
We have the final answer as
1.11 kmHope this helps you
What happens to the velocity of a sound wave in air if the temperature of the air increases?
A.
velocity increases
B. velocity does not change
c. velocity decreases
D. velocity drops to zero
