Answer:
4.66m/s
Explanation:
Given parameters:
Initial velocity = 4.8m/s
Acceleration = -0875m/s²
Length of the ramp = 0.75m
Unknown:
Final velocity = ?
Solution:
To solve this problem, we apply the right motion equation;
V² = U² + 2aS
V is the final velocity
U is the initial velocity
a is the acceleration
S is the distance = length of ramp
Insert the parameters;
V² = 4.8² + 2(-0.875)0.75
V² = 23.04 - 1.31
V² = 21.73
V = √21.73 = 4.66m/s
Need help solving this question.
Answer:
See the answers below.
Explanation:
to solve this problem we must make a free body diagram, with the forces acting on the metal rod.
i)
The center of gravity of the rod is concentrated in half the distance, that is, from the end of the bar to the center there is 40 [cm]. This can be seen in the attached free body diagram.
We have only two equilibrium equations, a summation of forces on the Y-axis equal to zero, and a summation of moments on any point equal to zero.
For the summation of forces we will take the forces upwards as positive and the negative forces downwards.
ΣF = 0
[tex]-15+T-W=0\\T-W=15[/tex]
Now we perform a sum of moments equal to zero around the point of attachment of the string with the metal bar. Let's take as a positive the moment of the force that rotates the metal bar counterclockwise.
ii) In the free body diagram we can see that the force acts at 18 [cm] of the string.
ΣM = 0
[tex](15*9) - (18*W) = 0\\135 = 18*W\\W = 7.5 [N][/tex]
Select the correct answer.
What condition should be met for the stellar parallax method to be useful?
A.
the star should be situated within the Milky Way
B.
the star should be brighter than the Sun
C.
the star should be close enough to the Sun to show a measurable parallax
D.
the star should be visible with the naked eye
Answer:
The answer is: C. the star must be close enough to the Sun to show measurable parallax.
Explanation:
In the field of astronomy, parallax is called stellar parallax in distant stars.
The stars for which parallax measurements have been made are those that are relatively close to the sun on the galactic scale.
The answer is: C. the star must be close enough to the Sun to show measurable parallax.
A 10 gram ball is rolling at 3 m/s. What is the energy the ball has?
Answer:
K = 0.045 J
Explanation:
It is given that,
Mass of a ball, m = 10 g = 0.01 kg
Speed of the ball, v = 3 m/s
To find,
The energy of the ball.
Solution,
Due to the motion of the ball, it will have kinetic energy. It can be given by the formula as follows :
[tex]K=\dfrac{1}{2}mv^2\\\\K=\dfrac{1}{2}\times 0.01\times 3^2\\\\K=0.045\ J[/tex]
So, the ball will have a kinetic energy of 0.045 J.
Which physical property is best measured using only a balance?
A. Color
B. Volume
C. Mass
D. Density
Answer:
The answer is Mass
Explanation:
I took the tests and study kinda yeahhhhhh
AHHHHHHHHHHHHHHHHHh chicks butts
A 50 km/hr wind is blowing due northwest what are the components of the wind in the northern
and western direction?
Answer:
The components of the wind in the northern direction is approximately 35.36 km/hr
Similarly, the components of the wind in the western direction is approximately 35.36 km/hr
Explanation:
The given parameters are;
The magnitude of the speed of the wind, v = 50 km/hr
The direction of the wind = The northwest direction
Therefore;
Given that the angle between the northern and western direction = 90°
The angle in the northwestern direction, θ = 90°/2 = 45°
Therefore;
The components of the wind in the northern direction = [tex]v_y[/tex] = v × sin(θ)
Substituting the values, we have;
The components of the wind in the northern direction = [tex]v_y[/tex] = 50 × sin(45°) = 50/√2 ≈ 35.36 km/hr.
Similarly, the components of the wind in the western direction = vₓ = 50 × cos(45°) = 50/√2 ≈ 35.36 km/hr
Finding volume using displacement and calculating density
Answer:
a) 0.1
b) density = mass/volume
= 0.5 /0.1
= 5 kg/[tex]m^{3}[/tex]
Scientists often use models to study the movement of continents. Why might scientists use a model to show this movement? A. Extremely fast movement is not easily observed directly. B. Extremely slow movement is not easily observed directly. C. Extremely complex movement is not easily observed directly. D. Extremely dangerous movement is not easily observed directly.
Answer: the answer is B. Extremely slow movement is not easily observed directly.
Extremely slow movement is not easily observed directly.
What are Continents?One of Earth's seven major landform divisions is the continent. The continents are Asia, Africa, North America, South America, Antarctica, Europe, and Australia, in order of largest to smallest.
Geographers typically include all the islands connected to a continent when identifying it. For instance, Japan is a country that belongs to Asia. Normally, all of the Caribbean Sea islands and Greenland are regarded as being in North America.
The combined area of the continents is roughly 148 million square kilometers (57 million square miles). Most of Earth's land surface, but not all of it, is made up of continents. Islands that are not physically a part of continents make up a minuscule amount of the overall land area.
Therefore, Extremely slow movement is not easily observed directly.
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define the unit of time and unit of length
Answer:
hope you like
Explanation:
A unit of time is any particular time interval, used as a standard way of measuring or expressing duration.Its SI unit is second
A unit of length refers to any arbitrarily chosen and accepted reference standard for measurement of length. Its SI unit is meter
The sum of two component vectors is referred to as the
vector.
Addition
Quantitative
Subtraction
Resultant
A storage tank contains a liquid at depth y where y=0 when the tank is half full. liquid is withdrawn at a constant flow rate q to meet demands. the contents are resupplied at a sinusoidal rate 3qsin2(t). the equation can be written for this system as the
Answer:
y(t) = [tex]\frac{3Q}{2A} ( t - 1/2 sin2t ) - \frac{Q}{A} t + C[/tex]
Explanation:
Given data :
storage tank contains a liquid at depth ; Y
when tank is half full ; y = 0
flow rate = q
sinusoidal rate = 3Q [tex]sin^{2} (t)[/tex]
Determine how the equation can be written for this system
solution is attached below
note ; from the question it can be seen that the surface area ( A ) is constant
You place a drop of blue food coloring in a cup of cold water and another drop of food coloring in a cup of hot water. Which observation is correct and why? A The food coloring in the hot water will spread more slowly than in the cold water because water molecules move more slowly when hot. B The food coloring in the hot water will spread more quickly than in the cold water because water molecules move more quickly when hot. C The food coloring in the cold water will spread more quickly than in the hot water because water molecules move more quickly when cold. D The food coloring in the cold water will spread at the same rate at the food coloring in the hot water because water molecules at any temperature move at the same rate.
Answer:
B food coloring will move quicker in hot water because the molecules move faster when they are hot
Explanation:
SCIENCE! aaaaand my physics text book
Option B is correct: The food coloring in the hot water will spread more quickly than in the cold water because water molecules move more quickly when hot since they have more kinetic energy.
Kinetic energy of the molecules:According to the question, we place a drop of blue food coloring in a cup of cold water and another drop of food coloring in a cup of hot water and then observe the spreading of the blue color in both the cups.
Option B will be correct because the kinetic energy of the molecules of a gas or a liquid is directly proportional to the absolute temperature of the gas or the liquid.
High kinetic energy means that the molecules will have higher velocity, which will make it easier for any solvent to dissolve in water since it will spread faster.
So the cup which has water at a higher temperature will have a faster spread of the food coloring.
Learn more about kinetic energy:
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Please answer these three multiple choices!
Would appreciate a loooottttt today!!
Answer:
Q2 [ C ]
Q4 [ C]
Q5 [ C]
if u want the steps write a comment
How fast will a bug that is going 640cm in 320 seconds travel across the
floor? *
O 2 seconds
O 2.56 cm/s
O 40,000 seconds
O 2 cm/s
Answer:
2 cm/s
Explanation:
As, 640cm/320s = 2cm/1s
Therefore, 2cm/ s
What are the different forms of potential energy
Answer:
Gravitational potential energy.
Chemical energy.
Nuclear energy.
Elastic potential energy
Electrical potential energy
Hope this helps :)
Which of the following best describes inertia?
A. Rowing a boat
B. Moving forward in your seat when the car suddenly stops
C. A rocket taking off from the launching pad
D. A bicycle requires less force to move than a car
40 POINTS I WILL GIVE TO BRAINLYEST.
PLEASE HELP
Just divide the d/t to get answer: 10.99
Explanation:
Please help. to find these
Answer:
Velocity ratio & input work
Explanation:
If u input velocity u can work the ratio...;D ;D ;D xD
Betsy created the following mnemonic device to help her remember the order of the planets starting from the Sun: “Most Very Elegant Mammals Sleep Just Until Noon”. Why doesn’t her mnemonic work?
a) She has Saturn and Jupiter in the wrong order.
b) She has Mercury and Venus in the wrong order.
c) She has Uranus and Neptune in the wrong order.
d) She has Earth and Mars in the wrong order.
Answer:
A
Explanation:
The order of the planets in the solar system, starting nearest the sun and working outward is the following: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Which of the following groups contain three elements with stable electron configurations?
A. xenon, neon, boron
B. helium, xenon, neon
C. argon, neon, barium
D. lithium, krypton, argon
Answer:
B. helium, xenon, neon
Explanation:
Which combustion product is a deadly gas that you cannot see or smell? O sulfur dioxide O carbon monoxide O carbon dioxide O sulfur monoxide
Answer:
carbon monoxide
Explanation:
Kinetic energy of 110 j and velocity of 70 m/s what is the mass
Answer:
0.04kg
Explanation:
Explanation in pics:
The formula for kinetic energy is KE = 1/2mv². So now the question asks for the mass, not KE. So we need to rearrange the formula so that we are calculating the mass. So, the formula for mass is m=KE/(1/2v²). Now we just substitute the values into the formula. Then just follow what it shows in the pic
A horizontal 52 Newton force is needed to slide a 50-kg box across a flat surface of a constant velocity of 3.5 m s what is the coefficient of kinetic friction between the box and the floor
Answer:
μk = 0.106
Explanation:
When the box is moving across the flat surface with a constant velocity, the force applied on it must be equal to the kinetic frictional force applied on the object:
F = μk*W = μk*mg
Where,
F = Force applied on box = 52 N
m = mass of box = 50 kg
g = 9.8 m/s²
μk = coefficient of kinetic friction between box and floor = ?
Therefore,
52 N = μk(50 kg)(9.8 m/s²)
μk = (52 N)/(490 N)
μk = 0.106
The coefficient of kinetic friction between the box and the floor will be 0.106.
What is kinetic friction?A force that acts among sliding parts is referred to as kinetic friction. A body moving on the surface is subjected to a force that opposes its progressive motion
The size of the force will be determined by the kinetic friction coefficient between the two materials.
The given data in the problem is;
μ is the coefficient of kinetic friction=?
m is the mass = 50 kg
g is the acceleration due to gravity= 9.81 m/s²
v is the speed =3.5 m/sec
Force(F)= 52 Newton
The formula for kinetic friction force is;
[tex]\rm F= \mu_k R \\\\ R=mg \\\\ F= \mu_k mg \\\\\ 52 = \mu_k \times 50 \times 9.81 \\\\ \mu_k = 0.106[/tex]
Hence,the coefficient of kinetic friction between the box and the floor will be 0.106.
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UWU plz help 50 points!!
A sprinter accelerates from the starting blocks with an acceleration of 2.5 m/s/s. They accelerate for a total of 8 seconds.
a. How far will they run while accelerating? Explain how you found your answer.
b. How fast are they moving after those 8 seconds? Explain how you found your answer
Answer:
i think its 20m for b
Explanation:
3. A student fills a plastic bottle full of water. He make a hole in the bottle half-way up,
and another hole at the bottom.
(a) Does the water come faster out of the hole in the middle or the hole at the bottom?
Explain your answer.
Answer:
It would go out the bottom hole faster.
Explanation:
It goes down the bottom hole faster because the water would get poured out the bottom before they even flipped the water bottle.
Monica walks from +21 m to - 46 m along a stretched-out tape measure.
What is her total DISTANCE traveled? Include units.
What is her total
DISPLACEMENT? Include units.
Answer:
67 meters (distance) +67 meters (displacement)
Explanation:
21 - (-46) meters
= 21 + 46 meters
= 67 meters
Hope this helped!
Answer:
67m
67m
both dist and displacement are the same oz it is on the same line
Find the mass if the force is 18 n and the acceleration is 2 m/s/s
Answer:
The answer is 9 kgExplanation:
The mass of an object can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{18}{2} \\ [/tex]
We have the final answer as
9 kgHope this helps you
Lily can run 100 m in 10s. How fast was her average speed?
Answer:
The answer is 10 m/sExplanation:
The average speed can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
d is the distance
t is the time taken
From the question we have
[tex]v = \frac{100}{10} \\ [/tex]
We have the final answer as
10 m/sHope this helps you
A textbook is pushed across a desk. It experiences what type of force
Answer:
kinetic friction force
Explanation:
Halp meeeeeeeeeeeeeeeeee
Answer:
1º all
2º 1
3º 2
4º the same
Explanation:
PLEASE HELP!! ITS URGENT!!!
Answer:
F = 800 [N]
Explanation:
To be able to calculate this problem we must use the principle of momentum before and after the impact of the hammer.
We must summarize that after the impact the hammer does not move, therefore its speed is zero. In this way, we can propose the following equation.
ΣPbefore = ΣPafter
[tex](m_{1}*v_{1}) - F*t = (m_{1}*v_{2})[/tex]
where:
m₁ = mass of the hammer = 0.15 [m/s]
v₁ = velocity of the hammer = 8 [m/s]
F = force [N] (units of Newtons)
t = time = 0.0015 [s]
v₂ = velocity of the hammer after the impact = 0
[tex](0.15*8)-(F*0.0015) = (0.15*0)\\F*0.0015 = 0.15*8\\F = 1.2/(0.0015)\\F = 800 [N][/tex]
Note: The force is taken as negative since it is exerted by the nail on the hammer and this force is directed in the opposite direction to the movement of the hammer.