Answer:
A
Explanation:
Chemical is a reaction between 2 things signs of that would be a new color, a new substance formed, or any sign of bubbles/smoke etc. while physical changes are done on purpose such as ripping a paper or cutting a log in half! hope that helped
A ball is dropped from an upper floor, some unknown distance above Tom's apartment. As he looks out of his window, which is 1.10 m tall, Tom observes that it takes the ball 0.190 s to traverse the length of the window. Determine how high ℎ above the top of Tom's window the ball was dropped. Ignore the effects of air resistance.
Answer:
The height is 1.20 m above the window.
Explanation:
Given that,
Height of window = 1.10 m
Time = 0.190 sec
We need to calculate the velocity
Using equation of motion
[tex]s=ut+\dfrac{1}{2}gt^2[/tex]
Put the value into the formula
[tex]1.10=u\times0.190+\dfrac{1}{2}\times9.8\times(0.190)^2[/tex]
[tex]1.10=u\times0.190+0.17689[/tex]
[tex]u=\dfrac{1.10-0.17689}{0.190}[/tex]
[tex]u=4.85\ m/s[/tex]
We need to calculate the height
Using equation of motion
[tex]v^2=u^2+2gh[/tex]
Put the value into the formula
[tex](4.85)^2=0+2\times9.8\times h[/tex]
[tex]h=\dfrac{(4.85)^2}{2\times9.8}[/tex]
[tex]h=1.20\ m[/tex]
Hence, The height is 1.20 m above the window.
Students in a lab were given an unknown sample to find the density of. The volume of the unknown sample was 16.8 ml, the calculated mass of the unknown sample was 134.4. What is the density of the unknown sample?
Note: You only have to fill in the numerical answer.
Answer:8
Explanation: 134.4 divided by 16.8
What is used in food preservation?
Answer:
If you are talking about the chemicals...
Explanation:
"Sugar, salt, nitrites, butylated hydroxy anisol (BHA), butylated hydroxyl toluene (BHT), tert-butylhydroquinone (TBHQ), vinegar, citric acid, and calcium propionate are all chemicals that preserve foods. Salt, sodium nitrite, spices, vinegar, and alcohol have been used to preserve foods for centuries."
Hope this is helpful!!
Devin investigated whether salt reduces the boiling point of water. She poured 1 gallon of 18 degrees Celsius (°C) water into a pot and added 2 cups of salt to it. Devin heated it over a fixed flame and measured the temperature when the water reached a rolling boil. She repeated the experiment with 1 gallon of water and 4 cups of salt under identical conditions. Where did Devin make a mistake in her experimental design?
She did not boil a pot of water without salt.
She waited until the water reached a rolling boil.
She used different amounts of salt in the two pots.
She did not heat the pots of water at the same time.
Answer:C
Explanation:
She used 2 different amounts of salts so that was her mistake she should of used 1
A car is traveling at 30 m/s when the driver spots an Elk in the road 50 m ahead.
Determine the necessary minimum acceleration to stop just in time. Draw the three
Graphs neatly.
Answer:
You will need to stop at least 20 m before you hit the elk.
Explanation:
Jordan wants to know the difference between using a 60-W and 100-W lightbulb in her lamp. She calculates the energy it would take to use each bulb for 30 s by using this equation: Power = Energy transferred (J)/time (s) What is the difference in the amount of energy transferred by the two bulbs during this time?
Answer:
The difference in the amount of energy transferred by the two bulbs is 1200 J.
Explanation:
The energy transferred by the two lightbulbs can be calculated with the given equation:
[tex] E = P*t [/tex]
Where P is the power and t is the time
For the 60 W lightbulb:
[tex] E_{60} = P*t = 60 W*30 s = 1800 J [/tex]
For the 100 W lightbulb:
[tex] E_{100} = P*t = 100 W*30 s = 3000 J [/tex]
Hence, the difference in the amount of energy transferred is:
[tex] E_{t} = E_{100} - E_{60} = 3000 J - 1800 J = 1200 J [/tex]
Therefore, the difference in the amount of energy transferred by the two bulbs is 1200 J.
I hope it helps you!
The difference in the amount of energy transferred by the two bulbs during this time is 1200 J.
Calculation of the difference in the amount of energy:We know that
E = P*t
Here
P means the power and T means the time
So for 60W lightbulb, the energy should be
= 60*30
= 1800J
For 100 W, the energy should be
= 100*30
= 3000 J
So, the difference is
= 3000 -1800
= 1200 J
hence, The difference in the amount of energy transferred by the two bulbs during this time is 1200 J.
Learn more about energy here: https://brainly.com/question/24401678
Coach Wilkins drops a football from the top of the home bleachers at Tiger Stadium. If the stadium is 17.5 meters tall, how long did it take the ball to fall?
Answer:
it took 70.6 meters for the ball to fall
In a circuit, a variable resistor is to be connected across a potential difference of 60 volts to allow the current to be adjusted in the range from 40 milliamperes to 100 milliamperes.
A variable resistor is a device in which the resistance can be varied.
mA = milliamperes, or 10-3 amperes
Over what range must the resistance vary?
plz help :')
Answer:
600 and 1500 [ohm
Explanation:
To solve this problem we must use ohm's law, which tells us that the voltage is the product of the current by the resistance, so we have:
V = I*R
where:
V = voltage [V]
I = current [amp]
R = resistance [ohm]
Therefore:
R = V/I
R1 = 60/(40*10^-3) = 1500 [ohm]
R2 = 60/(100*10^-3) = 600 [ohm]
So the resistance should be among 600 and 1500 [ohm]
mastering physics Two stones are launched from the top of a tall building. One stone is thrown in a direction 30.0 ∘ above the horizontal with a speed of 18.0 m/s ; the other is thrown in a direction 30.0 ∘ below the horizontal with the same speed
Answer:
The stone thrown upward lands farther away from the building.
Explanation:
Given that,
Angle = 30° above the horizontal
Speed = 18.0 m/s
Angle = 30° below the horizontal
Suppose, Which stone lands farther away from the building ?
We need to find which stone lands farther away from the building
Using formula of range
[tex]R=v_{x}t[/tex]
The horizontal velocity for the both stones is equal but the time will be different.
The time of stone thrown upward will be greater than that of downward.
Hence, The stone thrown upward lands farther away from the building.
2. In the activities below indicate if friction is useful or not useful? Explain your answer. i. Writing yes it is useful because when your writing because friction helps you see what your writing ii. Rubbing iii. Skiing iv. Rotating a wheel
Answer:
Please find the answer in the explanation
Explanation:
Friction is a force that opposes motion. One or two of the advantages of friction are break and ability of an object to walk.
Writing yes it is useful because when your writing because friction helps you see what your writing
ii. Rubbing. Yes, it is useful.
friction make it possible for two object to rub each other
iii. Skiing. No. It is not useful because With presence of friction, skiing will not be possible.
iv. Rotating a wheel No. It is not useful because Friction will oppose the rotation of the wheel.
how many bulldogs to beat 43 dragonss if each bulldog can beat 10 dragons
Answer:
5 bulldogs
Explanation:
you need 4 bulldogs to beat 40 dragons, but since you would still need 3 dragons defeated, you would need another bulldog
The the ______ is a disposable micro -camera used to take images of the digestive system
Answer:
Capsule (endoscopy)
Explanation:
The capsule endoscopy is a procedure whereby a pill containing a micro-camera is swallowed by a diagnostic patient. The capsule conveniently goes through the patient's digestive system tract and takes several thousands of images of the small and large intestines and as it travels through the digestive tract without causing pain or irritation to the patient.
Answer:
The answer is pill-cam.
Explanation:
. A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.
What are two characteristics of a proton?
A. Found outside the nucleus
O B. Found in the nucleus
C. Negative electric charge
I D. Positive electric charge
SUBM
Answer:
B and D
Explanation:
How would you measure and compare the size of two balls
Explanation:
The letter r stands for the radius of the sphere, which is the distance from the center of a sphere to its surface. The radius is exactly half of the diameter , which is the ...
A rock was dropped from a bridge over a river
If the rock was released when it was 11.2 m above the water and it took 0.550 s to reach the water, what its velocity when it was released?
The U.S. uses a household voltage of 110 V. However electric stoves and dryers are wired with 220 V outlet, or a German made 220 V rated curling iron into a 110 V outlet? explain
How far can a dragonfly get if it flies 17 seconds at a speed of 4.2 m/s
Answer:
The answer is 71.4 mExplanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
distance = velocity × timeFrom the question
velocity = 4.2 m/s
time = 17 s
We have
distance = 4.2 × 17
We have the final answer as
71.4 mHope this helps you
This is the object of love in philosophy.
a. wisdom b. learning c. intelligence d. human person
Answer:
a
Explanation:
Sound energy: chemical energy: mechanical energy:
mechanical energy
Explanation:
its right
1. What is the average speed of a racecar that travels a distance of 230 miles in 2 hours?
Answer:
s = d/t
s = 230/2
s = 115 mph
Explanation:
Average Speed (s) = Distance travelled (d) / Time elapsed (t)
after the Collision the two cars stick together find the initial velocity of the car on the right hand side
please help me :/
Describe how Newton's laws relate to real world life experiences. Give an
example of each law and how it relates to real life experiences.
Answer:
HOW NEWTON'S LAWS RELATE TO REAL WORLD LIFE EXPERIENCE
Newton's law are very important because they tie into almost everything we see in everyday life. These laws tell us exactly how things move or sit still, like why you don't float out of bed or fall through the floor of your house. Newton's laws control how cars work, how water flows, how buildings don't fall down, and basically how everything around us moves.
EXAMPLE OF NEWTON'S LAW:
° First Law: Inertia
°Second Law: Force and Acceleration
°Third Law: Action and Reaction
HOW NEWTON'S LAW RELATE TO REAL LIFE EXPERIENCE
FIRST LAW (INERTIA) :
If you throw a rock straight up, it will not vary from its direction. Inertia enables ice skaters to glide on the ice in a straight line. If the wind is blowing, a tree's branches are moving. A piece of ripe fruit that falls from the tree will fall in the direction the wind is moving because of inertia.
SECOND LAW (FORCE AND ACCELERATION) :
The use of force in our everyday life is very common. We use force to walk on the road, to lift the objects, to throw a cricket ball, or to move a given body by some particular speed or direction. We are very familiar with the various effects of force. We can exert pull and push. And also When the car slows down. When you fall off a bridge. The car turning at the corner is an example of acceleration because the direction is changing. The quicker the turns, the greater the acceleration.
THIRD LAW (ACTION AND REACTION) :
For example, when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air. Engineers too apply Newton's third law when designing rockets and other projectile devices.
what quantity can be obtained from the slope of a position time graph
Answer:
The slope of position-time graph is the velocity of the object understudy
If a car travels 300 m in 20 seconds how fast is it going?
Answer:
15mph
Explanation:
Because you've already done distance and time. Speed=distance divided by time. so it would be 300 divided by 20 giving you 15.
Define heat?!........
.
.......
Explanation:
Heat is a form of energy transferred between systems or objects of different temperature.What is the volume of a cube measuring 5.0 m on each side?
a
25 m3
b
125 m3
520 m3
d
5.0 m
Answer:
A.125
Explanation:
Its correct on Schoology.
parts of the breathing system
Answer:
it is a branch of tissue and organs . More it includes airways lungs and blood cells The muscles that power our lungs are also part of respiratory system .These parts work together to inhale oxygen and clean out waste materials(carbon dioxide) from our body .
please help! I'd really appreciate it :-)
How much is the current in a light bulb whose resistance is 350 ohms when the bulb is connected to a 110-volt outlet?
Answer:
0.31429 Amps
Explanation:
Using the "Ohm's Law" we can look for the current (amps) with a formula of I = V/R
Given:
Resistance (Ohm) = 350
Volts = 110
Solution:
I = 110v/350r
I = 0.31429 amps
An old man standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 14 m/s. The cliff is 63.5 m above the water's surface.
a. How long does it take the stone to fall to the water?
b. With what speed does the stone strike the water?
Answer:
a) t=3.6 sec
b) [tex]\mid v \mid =38\ m/s[/tex]
Explanation:
Horizontal Motion
When an object is thrown horizontally with a speed v from a height h, it describes a curved trajectory ruled by a constant speed in the horizontal direction and a variable speed in the vertical direction, where the acceleration of gravity makes the object fall to the ground.
If we know the height h from which the object was launched, the time it takes to hit the ground is:
[tex]\displaystyle t=\sqrt{\frac {2h}{g}}[/tex]
The horizontal speed is always constant:
vx=vo
But the vertical speed depends on the time and acceleration of gravity:
[tex]vy=g\cdot t[/tex]
The magnitude of the velocity or final speed of the object is given by:
[tex]\mid v \mid =\sqrt{vx^2+vy^2}[/tex]
a.
The stone was kicked over the cliff with a speed of v0=14 m/s, and the height it was thrown from is h=63.5 m, thus:
[tex]\displaystyle t=\sqrt{\frac {2\cdot 63.5}{9.8}}[/tex]
t=3.6 sec
b.
The vertical speed is:
[tex]vy=9.8\cdot 3.6[/tex]
vy=35.3 m/s
The final speed is calculated below:
[tex]\mid v \mid =\sqrt{14^2+35.3^2}[/tex]
[tex]\mid v \mid =\sqrt{1,442.09}[/tex]
[tex]\boxed{\mathbf{\mid v \mid =38\ m/s}}[/tex]