Answer:
75.56 m/s
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 0 m/s
Time (t) = 7.71 s
Acceleration due to gravity (g) = 9.8 m/s²
Final velocity (v) =..?
Thus, we can obtain the velocity (v) with which the pacifier hit the water as follow:
v = u + gt
v = 0 + (9.8 × 7.71)
v = 0 + 75.558
v = 75.558 ≈ 75.56 m/s
Therefore, velocity with which the pacifier hit the water is 75.56 m/s
Which of the following examples shows that a chemical reaction has occurred?
O A solid is formed when heat is removed from a sample of water.
A rock breaks into smaller pieces when it is struck with a hammer.
O A cup of water turns pink when a few drops of red food coloring are added.
Bubbles form when baking soda is added to vinegar and mixed.
Formation of bubbles when baking soda and vinegar are mixed is an example showing a chemical reaction has occurred as these two substances on mixing form sodium acetate.
What are chemical reactions?
Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and reactions are accompanied by an energy change as new substances are formed.
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Can two vectors of an unequal magnitude add up to give a vector with a magnitude of zero?
A car is traveling 24.8 m/s and speeds up to 26.8 m/s in 4.3 seconds. What is the car's average acceleration during this time?
≈ 0.47 m/s²
Explanation:Hi there !
Acceleration formula
a = (v₂ - v₁)/t
a = (26.8m/s - 24.8m/s)/4.3s
= (2m/s)/4.3s
≈ 0.47 m/s²
Good luck !
Which of the following statement is not true regarding liquid pressure?
liquid pressure increases as the height of liquid column increases.
liquid pressure increases with increase in density of the liquid
liquid pressure at same depth is same
liquid pressure is not affected by acceleration due to gravity
How many joules of potential energy does the pendulum have when it has 100 J of kinetic energy?
Answer: The maximum kinetic energy is 100 j.
Explanation: The kinetic energy = (potential energy) + (kinetic energy) and the potential energy of 0 J implying its kinetic energy is 100 J, which is its maximum.
If the maximum kinetic energy of the pendulum is 100 J, then the maximum potential energy of the pendulum will be 100 J as well.
The given parameters;
Kinetic energy of the pendulum = 100 JBased on the principles of conservation of mechanical energy, energy is always conserved.
If the maximum kinetic energy of the pendulum is 100 J, then its maximum potential energy will be 100 J as well.
M.A = K.E + P.E
where;
K.E is the kinetic energy P.E is the potential energyAt the lowest displacement of the pendulum;
M.A = K.E + 0
M.A = K.E = 100 J
At maximum displacement of the pendulum;
M.A = 0 + P.E
M.A = P.E = 100 J
Thus, if the maximum kinetic energy of the pendulum is 100 J, then the maximum potential energy of the pendulum will be 100 J as well.
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what is the volume of a bar of soap that is 9 cm long, 5 cm wide, and 2 cm high?
Answer:
90cm
Explanation:
2x5=10
10x9=90
Answer:
90 cm
Explanation:
To find volume, the formula is V=LWH
L is the length, W is the width and H is the height:
9 x 5 x 2 = 90
So V = 90 cm
Hope this helps you out! : )
When converting from kilometers to meters, the decimal is moved
a. three places to the left
b. two places to the left
three places to the right
d. two places to the right.
C.
B
Please select the best answer from the choices provided
Ο Α
B
D
Answer:
a
Explanation:
Answer:
You're best answer to your question would be C!!!
What is the density of a 36 g object with a volume of 15 cm3? (Density: D = )
0.42 g/cm3
0.54 g/cm3
2.4 g/cm3
5.4 g/cm
Answer:
The answer is 2.4 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 36 g
volume = 15 cm³
We have
[tex]density = \frac{36}{15} = \frac{12}{5} \\ [/tex]
We have the final answer as
2.4 g/cm³Hope this helps you
2. _____ - changes in appearances of the Moon as viewed from Earth, due to the relative positions of the Moon, Earth, and the Sun.
A. Maria
B. Moon phase
C. Solar eclipse
D. Lunar eclipse
Answer:
Moon Phase
Explanation:
I WILL MARK BRAINLIEST PLS HELP!!!!!
Which of these is an accurate statement about the strength of the force of gravity?
(1 Point)
It is strong distance force.
It is the strongest known force in the universe.
It does not exist in outer space.
It is relatively weak distance force.
i was wrong sorry
Explanation:
Answer:
it is relatively weak distance Force
ordered from strongest to weakest the forces are 1) the strong nuclear force, 2) the electromagnetic force, 3) the weak nuclear force, and 4) gravity
how will you place the coin inside the glass without touching it?
hmmmmmmmmmmmmmmmmmmmmm
A tunnel has a length of 50 km. A car takes 20 min to travel between the two ends of the tunnel. What is the average speed of the car
Answer:
150 km/h
Explanation:
50km/20min = x km/60 min
A laboratory experiment requires 1300 milligrams of sugar. How many kilograms of sugar does the experiment require?
Answer:
The answer is 0.0013.
Explanation:
The answer is 0.0013 becuase the number is even and you have to divide it by ten if it is milligrams to kilograms so basically always divide by tens. Hope this is helpful <3
The experiment requires 0.0013 kg of sugar.
How conversion of milligram to kilogram is done?The milligram is the mass = 1/1,000 of gram (or) 0.0154 grains.
The milligram is an SI unit of weight where as kilogram is also a unit of weight in the metric system.In the metric system, " milli " is the prefix for 10⁻³ and " kilo " is the prefix of 10³.Abbreviation of mg - milligram, kg - kilogram.For example, 50 milligram is 50 mg and 50 kilogram is 50kg.kilograms = milligrams ÷ 1,000,000
The weight in kilograms is equal to the milligrams divided by 1,000,000.
Here,
1300 mg = ( 1300 ÷ 1,000,000) = 0.0013 kg
Hence, the answer is 0.0013 kg.
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The most popular throw in ultimate frisbee is the what?
Answer:
The hammer.
Explanation:
The most practiced throw in Ultimate. A hammer is an overhead throw held with the forehand grip
Answer:
HAMMER.
Explanation:
Ah, the hammer. The most practiced throw in Ultimate. A hammer is an overhead throw held with the forehand grip
The ovaries in females and the testes in males are part of the
Answer:
Gonads
Explanation:
The gonads, the primary reproductive organs, are the testes in the male and the ovaries in the female. These organs are responsible for producing the sperm and ova, but they also secrete hormones and are considered to be endocrine glands.
Hope this helps :)
A car is driving at a velocity of 24 m/s. If its brakes can supply an acceleration of -5.0 m/s2, how much time will be required to bring the car to a stop?
10.2 s
-29 s
0 s
4.8 s
a physics teacher walks at a very constant and amazing velocity of 2 m/s. a sneaky and disgruntled student stands on top of a 20m building and plans to drop the balloon on the head of the caring and genuine 2m tall physics teacher below how far should the amazing teacher be from the impact point when the disingenuous student releases the balloon of fury?
Answer:
18m
Explanation:
The student should be 18m away from the teacher
What inertia is present in a stretched rubber?
Answer:
You input potential energy into the rubber band system when you stretched the rubber band back. Because it is an elastic system, this is kind of potential energy is specifically called elastic potential energy.
The inertia in the stretched rubber will be potential energy, i.e., elastic potential energy.
What is inertia?Law of inertia:
Newton's First Law of Motion (Inertia) is an object at rest remains at rest, an object in motion remains in motion at constant speed through straight line unless acted by an unbalanced force.
Moment of inertia:
The sum of the product of mass of each particle with the square of its distance from the axis of the rotation is known as inertia or the moment of inertia.
Formula of Moment of Inertia I = Σ miri².
The three types of inertia are as follows:
Inertia of Rest.Inertia of motion.Inertia of Direction.Inertia is the result of conservation of energy.
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A car is traveling with an initial velocity of 15 m/s when the driver decides to go faster by accelerating at 5 m/s squared for 10 seconds. How far did the car travel during this time?
Answer:
x = 400 [m]
Explanation:
To solve this problem we must use the following kinematics equations, first, we find the final speed, and then we proceed to find the distance traveled.
[tex]v_{f}=v_{i} +(a*t)\\[/tex]
where:
Vf = final velocity [m/s]
Vi = initial velocity = 15 [m/s]
a = acceleration = 5 [m/s^2]
t = time = 10 [s]
Note: the positive sign in the Equation indicates that the car is accelerating, i.e. its speed is increasing.
Now replacing
Vf = 15 + (5*10)
Vf = 65 [m/s]
Now using the second equation:
[tex]v_{f} ^{2}= v_{i} ^{2}+(2*a*x)[/tex]
where:
x = distance traveled [m]
x = (65^2 - 15^2)/ (2*5)
x = 400 [m]
What is the displacement when t =2s to 3s
Answer:
t=5s
Explanation:
t=2 + t= 3s = t= 5s
The part of a longitudinal wave where the particles are spread apart is called a______?
Here are the choose of answers: A- Top Wave has the highest pitch because it has the highest amplitude.
B - Bottom Wave has the highest pitch because it has the lowest frequency.
C- Bottom Wave has the highest pitch because it has the highest frequency.
D- Both waves have the same pitch because they both have the same frequency
When does air become turbulent around a thrown ball?
A. On the smooth side of a ball
B. On the rough side of a ball
C. On the right side of a ball
Answer: B (on the rough side)
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Air will become turbulent around a thrown ball on the rough side of the ball because it will cause the air waves to be irregular. Option B is the right answer.
When an object is moving in air, it moves smoothly if the shape is streamlined and the body of the object is smooth.
An object will experience turbulence when the air waves are violent and are irregular.
Therefore, air will become turbulent around a thrown ball on the rough side of the ball because it will cause the air waves to be irregular.
The correct answer is option B.
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What is the acceleration of the car from 0 to 2 s ? - What is the magnitude of the net force exerted on the car from 0 - 2s ? - What is the acceleration of the car from 2 s to 4s - What is the magnitude of the force exerted in stopping the car ? What is the instantaneous velocity at 1 ?
Answer:
a) a = 0 m / s²
, b) a = 0 ==> F = 0
, c) a = - 2 m / s²
,d) v = 4 m/s
Explanation:
a) It is asked to find the acceleration in the interval from 0 to 2s, from the graph we see that in this interval the velocity is constant with a value of 4 me / s, therefore the average eceleration is
a = (V₂ - V₁) / t
a = (4 -4) / 2
a = 0 m / s²
b) Newton's second law establishes a relationship between force and acceleration
F = m a
as acceleration is zero
a = 0 ==> F = 0
c) the acceleration in interval 2 a4 S
a = (0 - 4) / (4-2) = -4 / 2
a = - 2 m / s²
The negative sign iniquity the acceleration is slowing the movement
d) the force is
F = m a
F = 2 m
e) from the graph we can read the speed of the vehicle for time
v = 4 m / s
what is accelaration
Answer:
it like too gain speed like a car
The sound of frequency greater than 20,000 Hz is called ....
20,000 112 से अधिक आवृति की ध्वनि
कहा जाता है।
Positive electrode is called
घनात्मक इलेक्ट्रोड को
कहते हैं।
d.
Answer:
ultra sound... follow me
Which sentence describes the direction in which heat flows between any two objects?
A.
Heat flows from the object with less internal energy to the object with more internal energy.
B.
Heat flows from the object with a higher specific heat to the object with a lower specific heat.
C.
Heat flows from the object with a lower specific heat to the object with a higher specific heat.
D.
Heat flows from the object at a higher temperature to the object at a lower temperature.
Answer: D just took the test
Explanation:
Answer:
D
Explanation:
Jane measures a piece of metal and determines it has a mass of 10 grams and a volume of 2 mL. What is the density of the piece of metal?
Answer: 5g/ml
Explanation:
What is happening to the heat in freezing?
Answer:
Heat is released.
Explanation:
Freezing is almost always an exothermic process, meaning that as liquid changes into solid, heat and pressure are released. This is often seen as counter-intuitive, since the temperature of the material does not rise during freezing, except if the liquid were supercooled.
A sprinter running a 100 m race starts at rest, accelerates at constant acceleration of magnitude A for 2 seconds, then runs at a constant speed until the end. Find the position (relative to the start) and speed of the runner at the end of the 2 seconds, in terms of A.
Answer:
The distance ran by the runner in the 2 seconds is 2·A
The speed of the runner at the end of the 2 seconds is 2·A
Explanation:
The given information are;
The distance the sprinter is running = 100 m
The initial constant acceleration of the sprinter, a = A
The duration of the initial acceleration, t = 2 s
The initial speed of the printer, u = 0 (The sprinter starts from rest)
The rate with which the sprinter then runs with to the end = Constant speed
Therefor, we have, from the equation of motion;
s = u × t + 1/2 × a × t²
Where;
s = The distance ran by the sprinter
∴ at t = 2 seconds, we have;
s = 0 × 2 + 1/2 × A × 2² = 1/2 × A × 4 = 2·A
The distance ran by the runner in the 2 seconds = 2·A
The speed, v, of the runner at the end of the 2 seconds is given as follows;
v = u + a × t
When t = 2 seconds, we have;
v = 0 + A × 2 = 2·A
The speed of the runner at the end of the 2 seconds = 2·A.
7. For any given motion, the distance is
Answer:
For any given motion, the distance is
Explanation:
Explanation:
Given:
v₀ = 5.0 m/s
a = 2.5 m/s²
Equation:
Δx = v₀ t + ½ at²
Δx = (5.0 m/s) t + ½ (2.5 m/s²) t²
Δx = 5t + 1.25t²
Make a table of data using 1.0 increments for t.
Graph the data. See included image.