A heavy truck and a small truck roll down a hill. Neglecting friction, at the bottom of the hill the heavy truck has greater
Answer:
kenetic energy
Explanation:
or potential energy
What type of material can charges move through easily?
A.
Conductor
B.
Inductor
C.
Reductor
D.
Insulator
What is the importance of measurement
Answer:
Scientists use many skills as they investigate the world around them. They make observations by gathering information with
their senses. Some observations are simple. For example, a simple observation would be figuring out the color or texture of
an object. However, if scientists want to know more about a substance, they may need to take measurements.
Measurement is perhaps one of the most fundamental concepts in science. Without the ability to measure, it would be
difficult for scientists to conduct experiments or form theories. Not only is measurement important in science and the
chemical industry, it is also essential in farming, engineering, construction, manufacturing, commerce, and numerous
other occupations and activities.
The word “measurement” comes from the Greek word “metron,” which means “limited proportion.” Measurement is a
technique in which properties of an object are determined by comparing them to a standard.
Measurements require tools and provide scientists with a quantity. A quantity describes how much of something there is or
how many there are. A good example of measurement is using a ruler to find the length of an object. The object is
whatever you are measuring, the property you are trying to determine is the object’s length, and the standard you are
comparing the object’s length to is the ruler.
In general, scientists use a system of measurement still commonly referred to as the “metric system.” The metric system
was developed in France in the 1790s and was the first standardized system of measurement. Before that time, people
used a variety of measurement systems.
In 1960, the metric system was revised, simplified, and renamed the Système International d’Unites (International
System of Units) or SI system (meters, kilograms, etc.). This system is the standard form of measurement in almost
every country around the world, except for the United States, which uses the U.S. customary units system (inches,
quarts, etc.). The SI system is, however, the standard system used by scientists worldwide, including those in the
United States.
There are several properties of matter that scientists need to measure, but the most common properties are length and mass.
Length is a measure of how long an object is, and mass is a measure of how much matter is in an object. Mass and length
are classified as base units, meaning that they are independent of all other units. In the SI system, each unit of measure has
a base unit.
Explanation:
Some things scientists want to measure may be very large or very small. The SI, or metric, system is based on the
principle that all quantities of a measured property have the same units, allowing scientists to easily convert large and
small numbers. To work with such large or small numbers, scientists use metric prefixes. Prefixes can be added to base
units and make the value of the unit larger or smaller. For example, all masses are measured in grams, but adding
prefixes, such as milli- or kilo-, alters the amount. Measuring a human’s mass in grams would not make much sense
because the measurement would be such a large number. Instead, scientists use kilograms because it is easier to write
and say that a human has a mass of 90 kilograms than a mass of 90,000 grams. Likewise, one kilometer is 1,000 meters,
while one millimeter is 0.001 meters. The table below lists some common prefixes and the quantities they represent.
At a particular temperature, the speed of sound is 330 m/s and its frequency is 990 Hz. Choose the correct wavelength of this sound wave.
m
Answer:
1/3 M
I hope this helps :) sorry its late
Answer:
1/3 m
Explanation:
What is the momentum p if the mass m is doubled?
Vzp
1) р
2) 2p
3) 4p
Answer:
Correct answer: 2) 2p
Explanation:
Momentum
Momentum is a measurement of mass in motion or how much mass is in how much motion. The symbol for momentum is p and is defined as:
p = m . v
Where m is the mass of the object and v is the speed. Note this is the scalar version of the formula because both p and v are vectors.
Suppose the mass of the object is doubled to 2m, then the new momentum is:
p' = (2m) . v = 2 m . v
Or, equivalently:
p' = 2p
Correct answer: 2) 2p
A car traveling at 26 m/s skids to a stop in 3 seconds. Determine the skidding distance of the car.
Hello!
Topic: Cinematic
For this we can say:
Initial velocity (u) = 26 m/s
Final velocity (V) = 0 m/s
Time (t) = 3 s
Distance (d) = ¿?
For calculate skidding distance, let's applicate the formula:
[tex]\boxed{d = \frac{(u+V)}{2} *t}[/tex]
Replacing:
[tex]d = (\dfrac{26m/s+0m/s}{2})*3s[/tex]
[tex]d =\dfrac{26m/s}{2} * 3s[/tex]
[tex]d = 18m/s * 3s[/tex]
[tex]d = 54\ m[/tex]
The distance is 54 meters (m)
1. Why is life on Earth not possible without plants? Explain using elements/ CO2 O2 and H2O
HELP ME PLSSS!!! WILL MARK BRAINLIEST!!
Answer:
D
Explanation:
what allows for movement
Choose the correct answer:
-excretory
-immune/hymophatic
-integumentary
-muscular
A mass slides from rest down a 45 degree incline that has a coefficient of kinetic friction
equal to 0.2. What is the speed of the mass after it has slid for a total of 2 meters?
Answer:
The speed of the mass after it has slid for a total of 2 meters is 4.71 m/s.
Explanation:
The speed of the mass can be found using Newton second law:
[tex] \Sigma F = ma [/tex]
[tex] P_{x} - F_{\mu_{k}} = ma [/tex]
Where Pₓ is the weight force in the horizontal direction and [tex]F_{\mu_{k}}[/tex] is the friction force.
[tex]mgsin(\theta) - \mu_{k}mgcos(\theta) = ma[/tex]
[tex]a = g(sin(\theta) - \mu_{k}cos(\theta)) = 9.81 m/s^{2}(sin(45) - 0.2*cos(45)) = 5.55 m/s^{2}[/tex]
Now, we can find the speed of the mass using the following kinematic equation:
[tex] v_{f}^{2} = v_{0}^{2} + 2ax [/tex]
[tex]v_{f} = \sqrt{0 + 2*5.55 m/s^{2}*2 m} = 4.71 m/s[/tex]
Therefore, the speed of the mass after it has slid for a total of 2 meters is 4.71 m/s.
I hope it helps you!
This changed is most likely caused by the cell being transferred from
Answer:
chemical change .....
A girl throws a pebble into a deep well at 4.0 m/s (downward). It hits the
water in 2.0 s.
a. How far below the ground is the water's surface?
b. What is the pebble's average velocity?
BRAINLIEST HERE COME GET IT
Answer:
The answers is A lol
Explanation:
What is the main difference between protons and neutrons
A protons have a much smaller mass than neutrons
B protons have a much larger value than neutrons
C protons have an electrical charge but neutrons have no charge
D protons make up the nucleus but neutrons orbit around the nucleus
Answer:
C: Protons have an electrical carge but neutrons have no charge.
Explanation:
Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged.
what do we call a solar power plant that uses mirrors to focus the light of the sun on a central point
Answer:
Concentrating solar power (CSP) plants use mirrors to concentrate the sun's energy to drive traditional steam turbines or engines that create electricity.
Explanation:
!!!!!!PLEASE HELP ASAP !!!!!!!!!!!!
Answer: d constint speed
Explanation: im 15 and no the answer
A light ray propagates from air to glass. The refractive index for the glass is....
Please help me I’m so bad at physics that I just wanna cry whenever I study it
Answer:
118 to glass
Explanation:
Answer:
1.5
Explanation:
sin i / sin r = n
i = 135 - 90 = 45
r = 118 - 90 = 28
sin (45) / sin (28) = n
n= 1.5
in what two ways is a runoff harmful to human beings?
need help ASAP
Answer:
It can cause floods if there is enough build up, and mudslides. I think...
Describe the famous experiment related to gravity that Galileo may have performed. Include the results. Also, state whether the results support the law of gravity. Explain your answer.
Answer:
Galileo performed a famous experiment where he used a ball rolling on a ramp (inclined plane) to study the motion of objects under the influence of gravity. The ramp allowed him to make more precise measurements because the ball moved more slowly along the ramp than if it were simply dropped. Galileo discovered through this experiment that the objects fell with the same acceleration, proving his prediction true, while at the same time disproving Aristotle's theory of gravity (which states that objects fall at speed proportional to their mass). Galileo's conclusion from this thought experiment was that no force is needed to keep an object moving with constant velocity. Newton took this as his first law of motion. One result of the experiment surprised Galileo, and one surprises us. Galileo found that the heavy ball hit the ground first, but only by a little bit. Except for a small difference caused by air resistance, both balls reached nearly the same speed. And that surprised him. According to history, Galileo’s experiment on falling bodies largely contributed to Isaac Newton’s Law of Gravity. In Galileo’s experiment, he is said to have dropped balls from the Leaning Tower of Pisa. The balls were made of the same material but had different masses. Galileo set out to prove that the time it took for these objects to reach the ground would be the same. Galileo proved that objects reached the ground at the same time,
Explanation:
I think this is right & I hope this helped
A baseball has been thrown 0.15 kilometers into the air under normal earth gravity
(9.8 m/s2) If the baseball has 55 joules of potential energy, what is the mass of the
baseball?
Answer:
M = 0.037kg
Explanation:
Given the following data
Height, h = 0.15 km to meters = 0.15*1000 = 150m
P.E = 55J
Acceleration due to gravity, g = 9.8m/s²
To find the mass
P.E = mgh
Substituting into the equation, we have
55 = m*9.8*150
55 = 1470*m
Mass, m = 55/1470
Mass, m = 0.037kg
400 N of load can be overcome by an effort of 50 N by using a lever. Calculate the mechanical advantage of the lever.
load (l)=400N
Effort(E)=50N
mechanical advantage (MA)= load ÷Effort
(ma)=400÷50
(ma)=8
13. A 90-kg refrigerator is located on the 70th floor of a skyscraper (300 meters above the
ground) What is the potential energy of the refrigerator?
Answer:
2000000000
Explanation:
2000000000
Help me pleaseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Answer:
A (the first one)
Explanation:
why is sport important
Answer:
because it helps you as a human being get healthy and
fit
object approaching or receding, and at what speed?
10. Nonpolarized light of intensity 1, is incident on a
polarizing filter, and the emerging light strikes a
second polarizing filter, as shown in the figure.
What is the light intensity emerging from the second
polarizing filter
Answer:
where is the figure...
what type of lever is your foot
Answer:
wdym
Explanation:
The theory of continental drift proposes that the Earth's continents may have once been united as a supercontinent but have drifted apart over time.
What was the name of the supercontinent?
Answer:
Alfred Wegener proposed that the continents were once united into a single supercontinent named Pangaea, meaning all earth in ancient Greek. He suggested that Pangaea broke up long ago and that the continents then moved to their current positions. He called his hypothesis continental drift.
Explanation:
hope it was helpful
10 rectangular object's mass from greatest to least. You can choose books, sandwiches, phones, pictures - as long as the shape is a rectangle. Then rank the objects from the one with the heaviest mass to the one with the lightest mass.
Answer: 1 is phone 2 is sandwich, Last is picture.
Explanation: I hoped That Helped !!
An ice cube tray full of water is put into a freezer. The water eventually reaches 0ºC and undergoes a phase change from a liquid to a solid. Which change occurs in the particles in the water as it undergoes a phase change?(1 point)
The average kinetic energy decreases due to the arrangement of the particles.
The average kinetic energy decreases due to the motion of the particles.
The potential energy decreases due to the motion of the particles.
The potential energy decreases due to the arrangement of the particles.
Answer:
a
Explanation:
the kinetic energy decreases which makes the molecules bond together, that makes them not be able to move much
The average kinetic energy decreases due to the motion of the particles. Hence, option (b) is correct.
Given data:
The ice cube tray full of water kept in a refrigerator.
And water reaches at 0ºC to undergo the phase change from liquid to solid.
We know that, "The energy possessed by a molecule or any object due to its motion is known as average kinetic energy of molecule/object".
Now at initial the tray containing the water molecules were in liquid state. And in liquid state, the intermolecular interaction is less than that of solid. So water molecules were having more value of average kinetic energy.
When the temperature of water in the tray is reduced to 0ºC , then the they converted into solid with strong intermolecular interaction. And with this, now water molecules are not that much free to move, hence decrease in average kinetic energy occurs in the particles in the water as it undergoes a phase change.
Thus, we can conclude that the average kinetic energy decreases due to the motion of the particles. Hence, option (b) is correct.
Learn more about the atoms and molecules here:
https://brainly.com/question/15172278
Question 23 of 32
A truck has a mass of 9000 kg and a kinetic energy of 18,000 J. What is its
speed?
A. 4 m/s
B. 8 m/s
C. 2 m/s
D. 1.4 m/s
UBMIT
Answer:
2m/s
Explanation:
Given parameters:
Mass of truck = 9000kg
Kinetic energy = 18000J
Unknown:
Speed = ?
Solution:
Kinetic energy is the energy due to the motion of a body;
K.E = [tex]\frac{1}{2}[/tex] mv²
So;
m is the mass
v is the speed
2 KE = mv²
2 x 18000 = 9000 x v²
v² = 4
v = 2m/s
