Answer:
Explanation:
28 / 70 = 0.3857142... = 0.39 hr
280 / 100 = 2.8 hrs.
(100 - 0) / 10 = 10 m/s²
(60 - 20) / 4 = 10 m/s²
If the acceleration vector of an object is directed parallel to the velocity vector, then Select one:
O a. the object is moving with a constant velocity.
O b. the object is turning.
O c. the object is at rest.
O d. the object is slowing down
O e. the object is speeding up.
Answer:
a. The object is moving with a constant velocity.
A raindrop strikes the ground with a speed of 8.5 m/s. The specific heat of water is 4.19 x 103 J/(kg•°C).
What is the raindrop’s change in temperature after it strikes the ground, in degrees Celsius, assuming all its initial kinetic energy goes into heating it?
Answer:
0.00862 °C
Explanation:
When all Kinetic energy goes Into heating we can write
Q= mc × change in temperature
Q = 1/2 mv^2
1/ 2 mv^2 = mc × change in temperature
cancel out m because its in both sides
1/2 v^2 = c × change in temperature
1/ 2 × 8.5 ×8.5 = 4190 × x
x = 0.00862 °C
The energy an object has as a result of motion is known as kinetic energy.A force must be applied to an object in order to accelerate it.We must put in effort in order to apply a force.After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.
How is kinetic energy determined?
Kinetic energy has the following formula: K.E. = 1/2 m v2, where m is the object's mass and v is its square velocity.The kinetic energy is measured in kilograms-meters squared per second squared if the mass is measured in kilograms and the velocity is measured in meters per second. A particle or an item that is in motion has a sort of energy called kinetic energy.An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force. When all Kinetic energy goes Into heating we can writeLet's consider a few instances where we see kinetic energy in daily life while keeping this formula in mind.Hydropower Plants, Windmills, Moving Cars, Gunshots, Flying Airplanes, Walking and Running, Cycling, and Rollercoasters are just a few examples.Q= mc × change in temperature
Q = 1/2 mv^2
1/ 2 mv^2 = mc × change in temperature
cancel out m because its in both sides
1/2 v^2 = c × change in temperature
1/ 2 × 8.5 ×8.5 = 4190 × x
x =0.00862 °C
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A spring is attached to an inclined plane as shown in the figure. A block of mass m = 2.27 kg is placed on the incline at a distance d = 0.327 m along the incline from the end of the spring. The block is given a quick shove and moves down the incline with an initial speed v = 0.750 m/s. The incline angle is = 20.0°, the spring constant is k = 455 N/m, and we can assume the surface is frictionless. By what distance (in m) is the spring compressed when the block momentarily comes to rest?
Answer:
0.1351 m
Explanation:
*my number calculations may be wrong, but the process is correct*
W = Wg - Ws = mgh - [tex]\frac{1}{2}[/tex]kx^2 = mg(d + x)sinθ - [tex]\frac{1}{2}[/tex]kx^2
Δk = 0 - [tex]\frac{1}{2\\}[/tex]mv[tex]_{i}[/tex]^2
W = Δk
-[tex]\frac{1}{2}[/tex]mv[tex]_{i}[/tex]^2 = mg(d + x)sinθ - [tex]\frac{1}{2}[/tex]kx^2
Now plug in your given values:
m=2.27, g=9.8, d=0.327, θ=20, k=455, v=0.750
Now rearrange the equation so it is in the form ax^2 + bx + c = 0 where x is the unknown distance you are looking for.
~if my math is correct it should be:~
0 = -227.5x^2 + 7.608580108x + 3.126443195
Now plug your numbers into the quadratic formula and the positive x value you get is the answer.
~if my math is correct it should be:~
x = 0.1351376847 m = 0.1351 m
who discovered earth was like a big magnet
A plane travels a distance of 3,650 kilometers in 5.50 hours. What is the average speed of the plane
Answer: 625.71km/h
Explanation: Divide the numbers.
Help me please I will give you a crown!!!!
Answer:
D. First F, then D, then C
Help please need help asap
The pressure of a constant volume gas thermometer is 2100N/M squared at 38c. What will be the temperature of the gas when the pressure is increased by 1/3?
Answer:
Explanation:
In
name a suitable thermometer for steady temperature of 1000 degree Celsius?
Answer: A platinum resistance thermometer
Explanation:
It is a versatile instrument for temperature measurement in the range from — 200° to 1000°C. It is used both for precision measurements of the highest accuracy and for routine industrial work.
Answer:
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A 15.0kg box slides down an incline 5.00 m high and 9.00 m long. It starts at rest at the top and moves at the speed 2.50m/s when it is at the bottom.
How much work is done by friction? [688J].
What is the energy transformation efficiency? [94%]
Answer:
Explanation:
Potential energy at the top
PE = mgh = 15.0(9.81)(5.00) = 735.75 J
Kinetic energy at the bottom
KE = ½mv² = ½(15.0)(2.50)² = 46.875 J
Work done by friction is the difference
735.75 - 46.875 = 688.875 ≈ 689 J
HMMMMMmmmm Energy transformation efficiency is 100% because energy can be neither created nor destroyed. With the given answer, I'm guessing they want to know what percentage of the potential energy got converted to heat of friction
688.875 / 735.75 = 0.936289... ≈ 94%
Earth travels around the Sun in an elliptical orbit. Because of its elliptical orbit, Earth is not the same distance from the Sun at all times. When Earth is closer to the Sun, the amount of solar power that arrives at Earth's surface is greater. Total solar irradiance, also referred to as solar intensity, is defined as the total solar power received by a unit surface area and is measured in units of watts per square meter. The Sun's power output is 3.86 x 1026 W. The distance from Earth to the Sun is 0.9813 au when Earth is the closest, at perihelion, and 1.0160 au when Earth is the farthest, at aphelion. Calculate the average total solar irradiance Itop at the top of Earth's atmosphere. Express your answer to 4 significant figures. Itop = W/m²
The intensity of the radiation from the Sun reduces as the distance from the Sun increases.
The solar irradiance at the top of Earth's atmosphere is approximately 1,376.22 W/m².Reasons:
The solar flux density is given by the formula;
[tex]\displaystyle S_d = \frac{L}{ \left(4 \cdot \pi \cdot d^2 \right)}[/tex]
L = 3.86 × 10²⁶ W
The average distance from the Earth to the Sun is found as follows;
[tex]d_{ave } = \displaystyle \frac{0.9813 \ au + 1.0160 \ au}{2} = 0.99865 \ au[/tex]
1 au = 1.496 × 10⁸ km
0.99865 au = 0.99865 × 1.496 × 10⁸ km = 149,398,040 km
[tex]\displaystyle S_d = \frac{3.86 \times 10^{26}}{ \left(4 \times \pi \times (1.49398040 \times 10^{11})^2 \right)} \approx 1,376.22[/tex]
The solar flux density reaching Earth, [tex]S_d[/tex] = The average total solar irradiance
[tex]I_{top}[/tex] at the top of Earth's atmosphere ≈ 1,376.22 W/m².
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What are the properties of object located at infinites
Answer:
As the parallel rays coming from the object converge at the principal focus, F of a concave mirror; after reflection through it. Therefore, when the object is at infinity the image will form at F. Properties of the image formed: Point-sized image, highly diminished in size.
At Infinity: At focus (F)
Position of object: Position of image
Between F and C: Beyond C
Beyond C: Between F and C
Explanation:
This is because when the object is at infinity, the incident rays are parallel to the principal axis. Hence the image is formed at the focus. And the image is real and inverted but in diminished size.
how do anatomical similarities and differences between various organisms ( living and fossils) help infer lines of Evolutionary descent
Answer:
Explanation:
Based on the generalization that "form follows function".
If two creatures have the same or similar anatomical structures used to complete a task such as eating, moving, hearing, smelling, reproduction, etc. the likelihood they are genetically related is high.
If two creatures have differing means or structures used for completing a task, the likelihood of them NOT being closely related is high.
100 POINTS!!!!!!!!!!!!!!! (EASY SCIENCE 10 QUESTION!!!!!!)
In a GUT (Grand Unified Theory), what is "unified"?
Question 9 options:
subatomic particles
galaxies
fundamental forces
matter
Answer:
AccordingTo GUT(Grand Unified Theory)subatomic particles is Unified
Using sound waves signals allow oceanography to determine ocean depth
Answer:
echosounding
Explanation:
The time taken for the sound to travel through the ocean and back is then used to calculate water depths. The faster the sound waves return, the smaller the water depths and the higher the elevation of the seafloor.
a 225 kg crate is pushed horizontally with a force of 710n
Answer:
acceleration is 3.155
Explanation:
F = ma
710 = 225 a
a = 710/225
a = 3.155
Do you believe that Freud’s theory was applicable only to the era in which he lived, or do you believe it can still be applied today?
Answer:
Freud's importance to psychology and psychiatry remains in the foundational aspects of the science of human behavior and the mind. Outside of Freudian psychoanalysis, Freud is no longer applicable or important to practical applications of psychological theory.
Two spheres each have a mass of 2.0 x 10 kg. How far apart must they be to exert a
gravitational force of 50 N between them?
a).016 m b) 231 m c) 53,000 m
d) 110,000 m
e) 6.7 x 10" m
Hi there!
We can use the Gravitational Force equation:
[tex]F_g = \frac{Gm_1m_2}{r^2}[/tex]
Fg = Gravitational force (N)
m₁, m₂ = mass of spheres (kg)
r² = distance between the spheres
G = Gravitational Constant
We are given the force of gravity, so we can rearrange the equation to solve for r:
[tex]r^2F_g = Gm_1m_2\\\\r = \sqrt{\frac{Gm_1m_2}{F_g}}[/tex]
Plug in the given values:
[tex]r = \sqrt{\frac{(6.67*10^{-11})(2.0*10^9)(2.0*10^9)}{50}} = \boxed{231 m}[/tex]
Therefore, the correct answer is B) 231 m.
Question 1 (2.5 points)
Which of the following safety guidelines is NOT important to this lab experiment?
Use wet paper towels or a fire extinguisher to put out small fires.
Ensure that you have a clean working space to minimize errors.
Wear goggles when there are flying objects near your face.
Read instructions before beginning the lab so you know what you are doing.
Question 2 (2.5 points)
As the number of washers goes up, what happens to the mass and the centripetal force on the apparatus?
mass goes up, centripetal force goes down
mass goes up, centripetal force goes up
mass goes down, centripetal force goes down
mass goes down, centripetal force goes up
Question 3 (2.5 points)
What is the independent variable in this experiment?
number of washers
radius (length of string)
time for 20 revolutions
velocity
Question 4 (2.5 points)
What is the dependent variable in this experiment?
number of washers
radius (length of string)
time for 20 revolutions
velocity
Question 5 (2.5 points)
Why is it important to keep the length of the string the same?
Because it can affect the velocity by affecting the circumference.
To make the experiment easier.
Because that is the only length it will work properly at.
Because that is the only length it will work properly at.
Question 6 (2.5 points)
As the number of washers goes up, what happens to the circumference?
The circumference increases.
The circumference decreases.
The circumference stays the same.
What's a circumference?
Question 7 (2.5 points)
As the number of washers goes up, what happens to the time for 20 rotations?
The time increases.
The time decreases.
The time stays the same.
Question 8 (2.5 points)
As the number of washers goes up, what happens to the velocity?
The velocity increases.
The velocity decreases.
The velocity stays the same.
Question 9 (2.5 points)
Which of these is the best defintion for PERIOD in this experiment?
The time for one wave.
The time for one class.
The time for one revolution.
The dot at the end of a sentence.
Question 10 (2.5 points)
Why do we measure the time for 20 revolutions instead of the time for one revolution?
To get more accurate results.
Because human reaction time is too slow to reliably measure one revolution.
To reduce human errors in the results.
All the other answers are correct.
Answer:
I took the test on K12 and got an A
1. A
2. B
3. A
4. C
5. A
6. C
7. B
8. A
9. C
10.C
Your own car has a mass of 1200 kg. If your car produces a force of 6000 N, how fast will it accelerate?
PLS HELP!!!!
by pushing the crate up the ramp rather than lifting it to the platform, you are using ________ force, but moving the crate a ____________ distance
A) more; less
B) more; greater
C) less; greater
D) the same amount; greater
Answer:
a
Explanation:
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50 POINTS!!!!!!!!
In a GUT (Grand Unified Theory), what is "unified"?
Subatomic particles
Explanation:
Grand unification theory or GUT is a model that tries to describe the universe.
A red laser with a wavelength of 630 nm and a blue laser with a wavelength of 450 nm emit laser beams with the same light power. How do their rates of photon emission compare
Answer:
Evaluate the following numerical expressions.
6 + 3 • 4 =
18
(6 + 3) ÷ (4 – 5) =
Explanation:
Evaluate the following numerical expressions.
6 + 3 • 4 =
18
(6 + 3) ÷ (4 – 5) =
4. If an object had a mass of 216 g on Earth what would its mass be on the Moon?
Answer: Weight changes with surface gravity.So in Moon mass will be same as 26 gram mes.
Explanation:
A ball thrown straight up takes 1.89s to reach a height of 41.6m.
Taking g =9.81 m/s2, how much higher will the ball go?
Answer:
Explanation:
average velocity is 41.6/1.89 = 22.0 m/s
initial velocity u is
22.0 = (u + u - 9.81(1.89))/2
44.0 = 2u - 18.5
62.56 = 2u
u = 31.3 m/s
max height is
v² = u² + 2as
s = (v² - u²) / 2a
s = (0² - 31.3²) / (2(-9.81)) = 49.9 m
49.9 = 41.6 = 8.27 m higher
In process numbers have been rounded to 3 s.d. for reporting purposes.
if a 50.0 kg mass weighs 554 n on the planet saturn, calculate saturn's radius
Answer:
this is impossible unless im doing my math wrong sorry
Explanation:
Please help me to solve this problem
The vertical displacement of the wave is measured from the what? And what is the term for vertical displacement?
Explanation:
The vertical displacement of the wave is measured from the
equilibrium to the crest and is called the frequency.
crest to the trough and is called the amplitude.
trough to the trough and is called the wavelength.
equilibrium to the crest and is called the amplitude.
HØPÊ ĮŤ ÌŠ helpful
mark mE aS bRillAnT ♠A car traveling 23 m/s begins to decelerate at a constant rate of 5 m/s2. After how many seconds does the car come to a stop
The time elapsed when the car comes to complete stop is 4.6 s.
The given parameters;
initial velocity of the car, [tex]v_0[/tex] = 23 m/sacceleration of the car, a = - 5 m/s²The time elapsed when the car comes to complete stop is calculated as follows;
[tex]v_f = v_0 + at[/tex]
where;
[tex]v_f[/tex] is the final velocity of the car when it comes to a complete stop
[tex]0 = 23 + (-5)t\\\\0 = 23 - 5t\\\\5t = 23\\\\t = \frac{23}{5} \\\\t = 4.6 \ s[/tex]
Thus, the time elapsed when the car comes to complete stop is 4.6 s.
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What characteristics do black holes have?
