Answer:
72mph
Explanation:
z = (x-μ)/σ, where x is the raw score, μ is the population mean, and σ is the population standard deviation.
z score for 15th percentile = -1.036
Mean = 80 mph
Standard deviation = 7.7mph
Hence,
-1.036 = x - 80/7.7
Cross Multiply
-1.036 × 7.7 = x - 80
- 7.9772 = x - 80
x = 80 - 7.9772
x = 72.0228mph
Approximately 72 mph
The majority of the population in the United States speak __________.
Answer:
english or spanish
Explanation:
Answer:
English
Explanation:
The nucleus of an atom is
charged.
Positively
Liquid
Variably
Negatively
A motorcyclist started a race from START line and from rest, and accelerated with the acceleration of 3 m/s2 for 8 seconds. Then he was moving with a constant velocity for 2 seconds. What was the racer’s position from the START line after 8+2 seconds from the start of the race? The CHoices: 48,72,102,144,288
I REALLY NEED HELP ON THIS
what number should replace the question mark? I'll gladly appreciate your response and thank you!! ♥️
answer:
1 or 4
explanation:
hope this helped <3 also if wouldn't mind could you pls give me brainliest? (im trying to level up) thanks! :)
Help!
A ball is +8 m from the origin and moves -13 m. What is the ball's final position?
A. 21 m
B.-21 m
C. 55 m
D. -5 m
Answer: D. -5
It is -5 because you subtract 13 from 8 to get to the answer.
Answer:
d -5 m
Explanation:
bc 8 subtract by 13 = 5
A space shuttle enters Earth’s upper atmosphere with a velocity of 11,200 m/s and experiences an acceleration of -70 m/s². What is the magnitude of the shuttle’s velocity 10 s after the shuttle enters the upper atmosphere?
Answer:
magnitude =
Explanation:
Given an initial velocity of 11200m/s, and acceleration of -70m/s^2, we are told to find the magnitude of the velocity in 10s.
In general, magnitude is defined as the numerical value or quantity of a variable. In physics, magnitude refers to the total measure(length) of distance covered.
Why is hatha yoga used in physical education?
Answer:
yoga postures and breathing techniques in Hatha yoga purify the physical body.
Explanation:
what is rotating inside of the earth to create a magnetic field?
Answer:
So it's clear that Earth's hot iron core isn't what creates the magnetic field around our planet. ... On Earth, flowing of liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet
Explanation:
What is elastic energy determined by.
The ability to get energy out depends on the material's elasticity. The energy stored in a spring depends on the: Distance the spring is deformed (stretched or compressed) The spring constant, which defines the amount of force required to deform a spring by a certain length (the work done on the spring).
3. A 100 kg crate is sliding at a rate of 30.0 m/s, when a force of 250 N is applied opposite the
direction of motion, in addition to the friction, until the crate stops 5.0 s later. What is the
coefficient of kinetic friction between the crate and the floor?
Take the direction of motion to be the positive direction. The crate slows to a rest from 30.0 m/s in a matter of 5.0 s, so it has acceleration a such that
0 = 30.0 m/s + a (5.0 s) → a = -6.0 m/s²
At the moment its speed is 0, the crate has a net force of s + f acting in negative direction, where s and f denote the magnitudes of the stopping force (s = 250 N) and the friction force, respectively. By Newton's second law, we have
(-s) + (-f) = (100 kg) (-6.0 m/s²)
250 N + f = 600 N
f = 350 N
The friction force is proportional to the normal force by a factor of µ, the coefficient of kinetic friction. There is no movement in the up- and downward directions, so Newton's second law says
(-w) + n = 0
where w is the weight of the crate and n is the magnitude of the normal force. So
n = w = (100 kg) (9.80 m/s²) = 980 N
Then
f = µ n
350 N = µ (980 N)
µ = (350 N) / (980 N) ≈ 0.357
What is the main difference between physical and chemical changes? ____ a. Chemical changes require a change in composition and physical does not b. Chemical changes do not require a change in composition but physical they do. c. Chemical changes are reversible d. None of the above
Answer:
a. Chemical changes require a change in composition and physical does not
Explanation:
The main difference between physical and chemical changes is that chemical changes require a change in composition and physical does not.
A chemical change is the change in composition of a substance which is irreversible and a permanent change.
On the other hand, physical change is a temporary change in a substance and can be easily reversible. The composition of a substance do not change in physical composition.
Which characteristic is present in a planet but not in a dwarf planet? A spherical shape. An orbit around the sun. An orbit cleared of other objects. A potato-like shape.
Answer: An orbit cleared of other objects.
There are three basic characteristics that a planet must have. Dwarf planets have two of these characteristics: an orbit and a spherical shape. However, dwarf planet orbits are not cleared of other objects like the orbits of planets.
What is the velocity of an object that has been falling freely in a vacuum
for 4 seconds?
The velocity of an object that has been falling freely in a vacuum
for 4 seconds is 39.2 m/s.
The given parameters;
time of motion, t = 4 secondsThe value acceleration due to gravity in vacuum is approximately 9.8 m/s².
The final velocity of the object is calculated as follows;
v = u + gt
where;
u is the initial velocity of the object = 0g is acceleration due to gravity in vacuumSubstitute the given parameters and solve for v;
v = 0 + 9.8(4)
v = 39.2 m/s
Thus, the velocity of an object that has been falling freely in a vacuum
for 4 seconds is 39.2 m/s.
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A 20-kg child sits on a horse affixed to a carousel, which is located a distance of 2.3 meters from the
carousel's axis of rotation. The child makes 4 complete trips around the carousel in one minute.
A. What total distance does the child travel?
B. What is the period of the carousel?
C. What is the carousel's frequency?
D. What is the child's tangential velocity?
E. What is the child's centripetal acceleration?
F. What is the net centripetal force on the child?
Answer:
A) D = 57.8
B) 900 sec
C) 1.11 x 10^-3 HZ
D) V= 0.016m/s
E) 1.12x10^-4m/s
F) 2.24 x 10^-3 N
1. What type of energy transformation best fits what happens in a paper shredder?
Answer:
electrical- mechanical
Explanation:
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1. ____________________________ is the source of energy that drives Earth's water cycle. 2. As heat energy was added to the water, it changed state from a _______________________ to a ______________________. This __________________ is also called ___________________________. 3. As more energy is added to the water, the water molecules move _________________________ and farther apart.
Answer:
When water absorbs enough heat, it becomes a gas (water vapor). This process is called evaporation.
Explanation:
A rock dropped straight down reaches a final velocity of 17.07 m/s, how far down did the rock fall?
(Can someone plz help me out and if possible give the solution on how to solve it)
Answer:
fell DOWN 14.87m
Explanation:
vf^2=vi^2+2adeltax
[(17.07 m/s)^2-(0)^2]/[2*(-9.8 m/s2)]= deltax
x=-14.87 m
fell DOWN 14.87m
You are waiting in line for your favorite ride and carrying a backpack with you that
weighs 20 N. You've been standing in the SAME spot in line for 5 minutes how much
power do you use? Explain your answer.
Regulating your body temperature is a part of maintaining homeostasis. Which part of a person's diet plays the largest role in regulating body temperature? A. Minerals B. Iron C. Vitamins D. Water
Answer:
The correct option is D.
Explanation:
Water help to maintain homeostasis or regulate body temperature because water has the ability to maintain internal body temperature by responding to the body external temperature. The mechanism water uses to regulate temperature is sweat. When the external temperature is high , sweat. Help to prevent the body from overheating and this water is loss by evaporation and after that there is cooling which regulate the temperature.
Answer:
D
Explanation:)
A sprinter is running toward the finish line at 7 m/s. When he is 12 m away from the finish line, he begins to fatigue and slows at a rate of -0.6 m/s^2 . How fast is he running when he crosses the goal line? *Round your answer to the nearest hundredth.
Answer:
5.88 m/s
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 7 m/s
Acceleration (a) = –0.6 m/s²
Distance (s) = 12 m
Final velocity (v) =.?
We, can determine how fast the sprinter is running when he crosses the goal line as follow:
v² = u² + 2as
v² = 7² + (2 × –0.6 × 12)
v² = 49 + (–14.4)
v² = 49 – 14.4
v² = 34.6
Take the square root of both side
v = √34.6
v = 5.88 m/s
Therefore, the sprinter is running at a speed of 5.88 m/s when he crosses the goal line.
Pls help I am very confused science
Answer:
plant cell
Explanation:
because it has chloroplast
Alisa needs to make some hot tea for her ill mother. She uses some ice-cold water from the freezer and heats it up in the kettle. As she hears the teapot whistling, she asks herself, “How is the motion of the ice water’s particles changing as the hot tea is being made?”
What is the best answer to Alisa’s question?
Answer choices
A. The particles in the cold water moved at a slow rate until a decrease in temperature caused an increase in particle motion in the hot tea.
B. The particles in the cold water moved at the same rate until an increase in temperature caused a decrease in particle motion in the hot tea.
C. The particles in the cold water moved at a high rate until an increase in temperature caused a decrease in particle motion in the hot tea.
D. The particles in the cold water moved at a slow rate until an increase in temperature caused an increase in particle motion in the hot tea.
:)
Answer:
the answer is b
Explanation:
The particles in the cold water moved at a slow rate until an increase in temperature caused an increase in particle motion in the hot tea.
According to the kinetic theory of matter, the particles that compose matter are in constant random motion. The particles collide frequently with each other as well as with the walls of the container.
The temperature of the system refers to the average kinetic energy of the molecules of the body. At a lower temperature, the speed of the particles of water is slow. As the temperature increases, more kinetic energy is imparted to the molecules of water and they move faster.
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Please help 25 points Add the following numbers and round your answer to the correct number of significant figures:
90.0 + 80 =
Show both the unrounded and rounded answer.
Explanation:
Wouldn't this just be 90+80 meaning the answer would be 170?
The bird has a mass of 0.8 kg. Calculate the weight of the bird.
Data:
m=0.8kg
g=10m/s2
w=?
Solution:
w=mg
w=(0.8)(10)
w=8N
Result:
weight of the bird is 8N
what are the goals of the war and revolution
Answer:
to claim equal rights for all citizens and establish the rule of law required for that to be meaningful
Explanation:
answer:
which war? which revolution? im going to go on a whim and assume you are talking about the american revolution
patriots fought the revolution in order tobecome an independent nation from britian and create a new system of self-governance so that they could claim equal rights for all citizens and establish rule of law.
explanation:
hope this helped <3 also if wouldn't mind could you pls give me brainliest? (im trying to level up) thanks! :)
14.4 K.L of heat is required to raise the temperature of
a 12 kg substance from 275 K to 275.5 K. Identify the
substance
Answer:
The substance is Ethanol
Explanation:
To solve this problem we must use the expression of thermal energy calculation that relates the mass of a body with the specific heat of this and the temperature difference.
Q = m*Cp*(T_f - T_i)
where:
Q = amount of heat = 14.4 [kJ]
m = mass = 12 [kg]
Cp = specific heat [kJ/kg*K]
T_f = final temperature = 275.5 [K]
T_i = initial temperature = 275 [K]
Therefore we need to calculate Cp, and then compare this with the values in the given table attached.
Cp = 14.4/(12*(275.5 - 275))
Cp = 2.4 [kJ/kg*K]
Now we compare the Cp with the values given in the table.
So the substance is Ethanol
What is the center stone of an arch on a bridge called?
Thanks so much.
Answer:
keystone
Explanation:
In 1838 botanist Matthias Schleiden determined that all plants are composed of cells. In 1839 anatomist Theodor Schwann proposed that all animals are composed of cells. In 1855 biologists Rudolph Virchow added to Schleiden & Schwann’s observations and proposed that all living things are composed of cells. Which statement is also part of Virchow’s theory? Group of answer choices all cells have a cell wall all cells can develop into any other type of cell all cells come from pre-existing cells all cells are capable of photosynthesis
Answer:
All cells come from pre-existing cells
Explanation:
Rudolf Virchow, a German Physician, stated the theory that all cells arise from pre-existing cells. He used this theory to explain disease pathology at the cellular level. His work helped clarify that diseases occur not at tissue or organ level, but at the cellular level. This resulted in more accurate diagnosis of diseases by other scientists.
His legacies includes being among the first to use animals in his research, first to name numerous diseases and also the creation of many medical terms still in use today.
Calculate the momentum of a 2500 kg truck traveling 110 km/h
Answer:
275000
Explanation:
momentum = mass * velocity
2500*110=275000
Lionel explores electromagnetic induction using the procedure shown. 1. Move the magnet quickly into the right end of a solenoid. 2. Hold the magnet in the solenoid for 3 s. 3. Move the solenoid slowly to the left away from the magnet. What should Lionel observe during his investigation?
Answer:
B. A large current forms, drops to zero, then a smaller current forms in the opposite direction
Explanation:
The results of Lionel observation about electromagnetic induction is as follows:
In the first step, a large current will form because of the fast or quick movement of the magnet into the right end of a solenoid that generates a induces emf.
In the second step, the magnet was in rest position for 3 s so the current drops to zero because according to Faraday's law, no voltage will be generated if the magnet held stationary and no voltage means no current.
In the third step, smaller current forms in the opposite direction as the magnet is slowly moving away from the solenoid generating a smaller voltage.
Hence, the correct answer is "B."
Answer:
B
Explanation: