Answer:
It must return at the same velocity with which it was thrown or else there would be a preferred direction of motion leading to perpetual motion.
a = (v2 - v1) / t = (v2 - 0) / 2 = v2 / 2 for a falling object
v2 = 2 a = 2 sec * 9.8 m/sec^2 = 19.6 m/s
You can check with
H = V0 t - 1/2 g t^2 (V0 and g are in different directions)
H = 0
V0 = 1/2 g * 4 = 19.6 m/s
a boy steps off the end of a high diving board and drops into the water below. it takes the boy 0.78 seconds to reach the water. How high was the diving board?
Answer:
7.644 feet
Explanation:
Free fall means that an object is falling freely with no forces acting upon it except gravity, a defined constant, g = -9.8 m/s2. The distance the object falls, or height, h, is 1/2 gravity x the square of the time falling.
A 250 g sample of water with an initial temp of 98.8 c loses 7500 joules of heat. What is the final temperature of the water?
The final temperature of the water is 106.0 °C
From the question,
We are to determine the final temperature of water.
From the formula
Q =mcΔT
Where Q is the quantity of heat
m is the mass of substance
c is the specific heat capacity of substance
and ΔT is the change in temperature
Also,
ΔT = T₂ - T₁
Where T₂ is the final temperature
and T₁ is the initial temperature
Then, the formula can be written as
Q =mc(T₂ - T₁)
From the question
Q = 7500 J
m = 250 g
T₁ = 98.8 °C
Putting the parameters into the formula, we get
7500 = 250 × 4.184 (T₂ - 98.8)
(NOTE: specific heat capacity of water, c,= 4.184 J/g °C)
7500 = 1046 (T₂ - 98.8)
7500 = 1046T₂ - 103344.8
Then,
1046T₂ = 7500 + 103344.8
1046T₂ = 110844.8
∴ T₂ = 110844.8 ÷ 1046
T₂ = 105.9701 °C
T₂ ≅ 106.0 °C
Hence, the final temperature of the water is 106.0 °C.
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PLEASE HELP MY WHOLE GRADE-DEPENDS ON THIS
A motorboat whose speed in water is 5.00 m/s must aim upstream at an angle of 47.5° above the
horizontal in order to travel directly across the river. A. Diagram the physical scenario and add the triangle (2 pt). B. What
is the speed of the river (1 pt)? C. What is the resultant speed of the boat with respect to the shore (1 pt)? D. If the opposite
shore is 191 meters away, how long will it take to get across (1 pt)?
Answer:
C.
Explanation:
Because the speed pf the boat will depends of the driver.
Which is true for every atom of an element?
A.
It can be seen with a magnifying glass.
B.
It is joined together with another atom.
C.
It has mass and volume.
D.
It is weightless.
Answer:
A
Explanation:
Every atom of an element has its own mass and volume as the atom is the smallest fundamental unit of the matter, therefore the correct answer is option C.
What is the matter?Anything which has mass to keep the same when comparing the hardness of the solid and occupies space is known as matter, mainly there are four states of matter solid liquid gases, and plasma.
As given in the problem statement we have to find the true statement from the given options that is true for every atom of an element,
The size of an atom of an element is a very small order of magnitude so it can not be seen with a magnifying glass, therefore, option A is not the correct response.
Thus, every atom of an element has its own mass and volume as the atom is the smallest fundamental unit of the matter, therefore the correct answer is option C.
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please someone should help me and solve this is under Hooke's law
[tex]F=k(l_1-l_2)[/tex]
[tex]10=5k[/tex]
[tex]k=2[/tex]
[tex]15=2*(30-l_2)[/tex]
[tex]15=60-2l_2[/tex]
[tex]2l_2=45[/tex]
[tex]l_2=22,5cm[/tex]
The horizontal rows on the periodic table are called
Answer:
periods or series
Explanation:
The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. Elements in the periodic table are organized according to their properties.
brailiest pls
Disolveram-se 6,0g de NaOH em 114,0g de agua , exprime a composicao da solucao em percentagem em Massa de soluto por Massa de solucao
Answer:
i donot know
Explanation:
i done it for the first time
Explain why the coin is able to float on top of the water in this glass.
Answer:
Surface tension is the result of water molecules pulling inward with a strong attractive force. This attractive force brings the molecules on the surface of the water close together and causes the surface of the water to be drawn toward the water molecules beneath the surface. Since there are no water molecules above the surface, there are uneven forces. This causes surface tension, allowing the coin to float on the water’s surface.
Explanation:
Brainliest pls
the quantity x to be determined from the equation X=P-Q.
Answer:
the correct answer will be 6.82 %that is 7%
p(1.27)-q(0.83) =x=0.44
0.02+0.01 =0.03 (maximum uncertainty)
percentage uncertainty =0.03/0.44×100 %
=6.82%
=7%
Explanation: it was d on my end
The tallest volcano on Mars
A
is three times the height of Mt. Everest.
B
is almost as tall as Mt. Everest.
C
has been visited 44 times.
D
is wet, rocky and cold.
Answer: Is three times the height of Mt. Everest
Explanation:
Using the process of elimination we can rule out “D” Because its a volcano, C because it says we have visited mars 44 times not the volcano, B because in the passage is literally says “3 times the size of Mt. Everest”.
You can't see anything if time stop..
Explain
You can't see anything if time would stop:
This is in fact true...if time stops then photons will also stop and they will unable to reach your eyes, so would your metabolism and cellular activity. Thus you won't be able to see anything.
Hope this helped you- have a good day bro cya)
Answer:
You can't see anything if time stop..
Explanation:
IG
it is important to realize that an element’s line spectrum can include emissions at wavelengths throughout the electromagnetic spectrum including ultraviolet, visible, and infrared. according to the procedure in section 2, where will you be collecting data on hydrogen and helium’s line spectra?
Answer:
visible region
Explanation:
According to the procedure in section 2, in visible region the data collected on hydrogen and helium’s line spectra.
What is electromagnetic spectrum?Electromagnetic spectrum are the wave which is form of energy and includes the waves such as radio waves, gamma waves, visible light waves etc.
An element’s line spectrum can include emissions at wavelengths throughout the electromagnetic spectrum including ultraviolet, visible, and infrared.
Types of electromagnetic spectrum-
Radio waves-Radio waves are used to broadcast the signal and television signals.Microwaves-Microwaves are used in the mobile signals, Radar and in cooing the food.Infrared-Infrared transmit heat from difference sourced of fire.Visible light-This is the type of electromagnetic radiation, which is visible to the human eye.Ultraviolet-Ultraviolet electromagnetic radiation used in florescent tubes.X-rays- X-rays are used to see throughout the objects and the bodies.Gamma rays- Used in medical, to kill the cell causes cancer.
The hydrogen line spectra fall between wavelength, 410 nm to 656 nm. The helium line spectra fall between wavelength, 400 nm to 781 nm.This two fall in the visible region of line spectra.
According to the procedure in section 2, in visible region the data collected on hydrogen and helium’s line spectra.
Learn more about the electromagnetic radiation here
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a 6.00-kg ornament is held at rest by two light wires that form 30° angles with the vertical, as shown in the figure. an external force of magnitude f acts vertically downward on the ornament. the tension exerted by each of the two wires is denoted by t. a free-body diagram, showing the four forces that act on the box, is shown in the figure. if the magnitude of force f is 410 n, what is the magnitude of the tension t?
The equilibrium condition allows finding the result for the tension of the cable that supports the block is:
The tension is: T₁ = 270.66 N
Newton's second law gives a relationship between force, mass and the acceleration of bodies, when the acceleration is zero it is called the equilibrium condition.
A free-body diagram of the forces is shown in the attachment.
Let's write the equilibrium equation for the vertical axis.
2 [tex]T_1_y[/tex] - f - W = 0
2 [tex]T_1_y[/tex] = W + f
Let's use trigonometry to find the tension, as the angle indicates that it is relative to the vertical.
cos 30 = [tex]\frac{T_1_y}{T_1}[/tex]
[tex]T_1_y[/tex] = T1 cos 30
We substitute.
2T₁ cos 30 = W + f
T₁ = m g + f / 2 cos 30
T₁ = [tex]\frac{6 \ 9.8 + 410}{2 \ cos 30}[/tex]
T₁ = 270.66 N
In conclusion using the equilibrium condition we can find the result for the tension of the cable that supports en bloc is:
The tension is: 270.66 N
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what is lighting and lighting conductor
which scientist was the first one to use a telescope
Answer:
Galileo Galilei developed the first ever telescope
If a 160W light bulb consumes 1000J of electrical energy in a given time, then in the same time interval, how much energy will a 40W light bulb consume?
Answer:250J
Explanation:
160*t=1000
40* 1000/160= 250
Hey guys <3
I need some help with this performance task,, physics isn’t my strongest subject so help is much appreciated :)
(4/9 parts)
Answer:
like charges repelunlike charges attractsWhat are tadpoles? How does it look like
Answer: a tadpole is the first or second step into the evolution for a frog
Explanation: a frog starts with the egg then it becomes a tadpole for 6 to 12 weeks before it can start going out the water.
Answer:
Tadpoles are baby frogs. The tadpole looks like a frog with a tail and becomes a froglet around 12 weeks after hatching. The tadpole becomes an adult frog around 13 to 16 weeks after hatching.
Explanation:
I also attached a photo for you
Brainliest or rating please and thank you
Zeb was moving his dresser. He pushed with 1000N and the resulting acceleration was 200m/s2. What was its mass?
Answer:
5
Explanation:
Formula for Mass (for this question)
[tex]mass=\frac{Force}{Acceleration}[/tex]
mass= 1000N/200[tex]m^{2}[/tex]=5
(pls do correct me if I have any mistakes it would rlly help others!)
10. A flower pot falls off the balcony 10 m above the street. How long does it take to hit the
ground?
A bus is running with a velocity of 72 km.hr on seeing a a boy on the road tom a head the driver jammed on the brakes and the bug Stopped witts uniform retradtion 5 m/s2 calculate the distance travelled by bus and discuss whether accident took place or not.
Answer:
Answer is 40m
Explanation:
The explanation is attached in the image below.
A delivery truck travels 18 blocks north, 10 blocks east, and 16 blacks south What is the
distance traveled and displacement? Assume all blocks are the same length
Force Unit
Answer:
Traveled north = 18 blocks
Traveled east = 10 blocks
Traveled south = 16 blocks
So total distance = (18+10+16) blocks = 44 blocks
as north and south are opposite
so traveled displacement from up to down is = (18-16) blocks = 2 blocks
and starting to east distance is 10 blocks
so using pythagoras theorem the displacement
= [tex]\sqrt{10^{2}+2^{2} }[/tex] blocks
= [tex]\sqrt{104}[/tex] blocks
= [tex]2\sqrt{26}[/tex] blocks
= 10.198 blocks (approx.)
ANS: distance=44 blocks, displacement=10.198 blocks (approx.)
Explanation:
Use the velocity vs time graph to analyze the motion of the object.
Explanation:
the object has constant velocity for 2 seconds and it get a constant accelration (2ms-2)
Mr. Ben drove from Town A to Town B. For the first 3 hours, he traveled at an average speed of 60 km/h, and after that, he drove at another average speed of 70 km/h. If the distance between Town A and B is 460 km, what was the total time for the whole journey?
Answer:
First you calculate the distance covered in First 3hrs then calculate the time for the remaining distance then add the total time
essay on topic of community forest
Answer: https://www.fs.usda.gov/managing-land/urban-forests/ucf
Explanation:
if you go to this link it will give you some facts
How does the study of light provide knowledge about stars, galaxies, and the universe’s beginning?
Answer in 3 to 4 sentences.
Answer:
from spectral lines astronomers Can determine
which nuclear decay emission consists of energy only?
Answer:
Gamma radiation
Explanation:
Gamma radiation is a decay emission of pure energy.
how can iron filings be used to map the magnetic field of a bar magnet?
HELP
How do i find the centripetal acceleration and force from the mass and radius????
I wasn't given any velocity value please help
Answer:
"ac = v2/r"
This is the formula and is the main step to learning about how to figure out the centripetal acceleration and force from mass and radius.
if v= 4.3 + 1.2% and I = 2.1A + 4.5% find the resistance and significant figures