Answer:
Speed describes how far an object moves in a given amount of time (for example, miles per hour).
Explanation:
Which statement best describes the purpose of the vacuum inside a thermos?
A. It prevents particles from transferring thermal energy between the inner and outer bottles.
B. It increases heat loss through conduction between the outer and inner bottles.
C. It prevents heat loss through radiation, which requires matter to transfer energy.
D. It allows for more collisions between the particles that make up the outer and inner bottles.
Answer:
I think its a.
Explanation:
For a car travelling at an increasing speed, it's average speed must be equal to the average value of its initial speed and final speed.
True or False
(p.s. I think it is true)
Answer:yeah its true
A person walks 2.00 m east, then turns and goes 4.00 m west, then turns and goes back 1.00m East
what is the persons displacement?
Answer: what is the person’s distance
what can you say about the acceleration of objects falling in a vacuum?
Answer:
The mass, size, and shape of the object are not a factor in describing the motion of the object. So all objects, regardless of size or shape or weight, free fall with the same acceleration. In a vacuum, a beach ball falls at the same rate as an airliner.
Explanation:
ALL objects (regardless of their mass) free fall with the same acceleration - 9.8 m/s/s. This particular acceleration value is so important in physics that it has its own peculiar name - the acceleration of gravity
what are the four system of measurement
Answer:
ask google
Explanation:
2. the energy of the pendulum as it swings up
O potential energy
O kinetic energy
Greatest Potential
O Greatest Kinetic
HELP PLEASE!!!! 20 POINTS! If we increase the distance traveled over the same period of time, this will (2 points) decrease the speed
increase the speed
decrease the velocity
not affect speed or velocity
A block attached to a horizontal spring of force constant 75N/m undergoes SHM with an amplitude of 0.15m. If the speed of the mass is 1.7 m/s when the displacement is 0.12m from the equilibrium position, what is the mass of the block?
Answer:
x = A sin w t for SHM where w = angular frequency
sin w t = x / A = .12 / .15 = .8 where w t is the angle in degrees
w t = 53.1 deg (w itself is in rad / sec)
since v = A w cos w t
then v / x = w cos w t / sin w t = w / tan w t
w = v / x * tan 53.1 = 1.7 / .12 * tan 53.1 = 18.9 /sec
Also for SHM w = (k / m)^1/2
m = k / w^2 = 75 / 18.9^2 = .21 kg
A 25 newton force applied on an object moves it 50 meters. The angle between the force and displacement is 40.0 degrees. What is the value of work being done on the object
Function of bones in the body?
Any of the pieces of hard whitish tissue making up the skeleton in humans and other vertebrates.
The calcified material of which bones consist
A speed-time graph is shown below:
Speed vs. Time
What is the average acceleration of the object represented in the graph above over the eight seconds?
A) 0.5 cm/s2
B) 1.0 cm/s2
C) 1.5 cm/s2
D) 2.0 cm/s2
Answer:
The average acceleration of the object is 0.5 cm/s^2. Answer: A)
Explanation:
Average Acceleration
The average acceleration of a moving object is the rate at which the speed changed over time in a specific period. It can be calculated as follows:
[tex]\displaystyle \bar a=\frac{v_f-v_o}{t}[/tex]
Where vf is the final speed, vo is the initial speed and t is the time.
The speed-time shows the speed starts at 0 cm/s and ends at 4 cm/s over the 8 seconds period. The average acceleration is:
[tex]\displaystyle \bar a=\frac{4-0}{8}=0.5[/tex]
The average acceleration is 0.5 cm/s^2
A) Correct. The average acceleration is 0.5 cm/s^2
B) Incorrect. The average acceleration is 0.5 cm/s^2
C) Incorrect. The average acceleration is 0.5 cm/s^2
D) Incorrect. The average acceleration is 0.5 cm/s^2
Answer:
A) 0.5 cm/s2
Explanation
I took the quiz the correct answer is A
If I am throwing a bowling ball off a roof and a watermelon off a roof at 30
feet, which object do you think will have more energy?
Answer:
Th ball
Explanation:
What happens to a circuit's R, V, and I when you change the length of the wire
in the circuit?
The resistance in a circuit is directly proportional to the length of the wire. Thus as the length increases, R increases and current I decrease. But the voltage v remains constant.
What is Ohm's law ?Ohm's law states that, the voltage across a circuit is the product of the current and resistance.
Thus, V = I R
The resistance R is expressed by the expression:
R = ρ l/a
where ρ is the proportionality constant called resistivity and l and a be the length and area of the wire.
Thus, as the length increases, resistance also increases.
The increase in resistance result in a decrease the current through the circuit. Therefore, voltage remains constant. Hence, option B is correct.
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Which of the following is a metal?
A.
iron (Fe)
B.
sodium (Na)
C.
calcium (Ca)
D.
all of these
Answer:
D. All of the above
Explanation:
YES
From the given options, Iron, sodium, and calcium are metals. (option d)
A. Iron (Fe): Iron is a metal. It is one of the most abundant elements on Earth and is widely used in construction, manufacturing, and various industries due to its strength and durability. Iron is an excellent conductor of electricity, which makes it essential for electrical applications.
B. Sodium (Na): Sodium is also a metal. It is a highly reactive metal and is commonly found in compounds like sodium chloride (table salt). Sodium is an essential element for living organisms and plays a crucial role in various biological processes.
C. Calcium (Ca): Calcium is a metal. It is an important element for the human body, as it is a major component of bones and teeth. Calcium is also involved in muscle contraction, nerve function, and blood clotting. Moreover, it is used in the production of alloys and as a deoxidizer in metallurgy.
D. All of these: The correct answer is D. All of the options (iron, sodium, and calcium) are metals. They exhibit typical metallic properties such as high electrical and thermal conductivity, metallic luster, and malleability.
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The motion of an object is determined by the sum of the acting on it.
the force acting on that object
8. You are heating a substance in a test tube. Always point the open end of the ne
a. Toward yourself
b. Toward your lab partner
C. Toward another classmate
d. Away from all people
Answer:
b ok bye thansks
bye.
Always point the open end of a test tube being heated d. Away from all people.
When heating a substance in a lab, there is a chance that the substance could react to the heat and evaporate into a gaseous state.
This could be very dangerous if the gas is:
corrosivea pollutant biological breathing hazardYou should therefore be careful to point the tube away from others and yourself so that the gas does not affect either them or you.
In conclusion therefore, always point the open end of the tube away from all people.
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the unit of mass is fundamental unit
Answer:
Kilogram and symbol kg.
A car accelerates (at a constant rate) from rest to 24-m/s in 19.6-seconds. How far will it travel during that
time?
Answer:
235.2 m
Explanation:
Given:
v₀ = 0 m/s
v = 24 m/s
t = 19.6 s
Find: Δx
Δx = ½ (v + v₀) t
Δx = ½ (24 m/s + 0 m/s) (19.6 s)
Δx = 235.2 m
Initial speed = zero
Final speed = 24 m/s
Time interval = 19.6 s
We have to find distance traveled by during the given interval of time[tex].[/tex]
★ Acceleration of car :
➠ a = (v - u)/∆t
➠ a = (24 - 0)/19.6
➠ a = 1.22 m/s²
★ Distance traveled by car :
➤ v² - u² = 2as
➤ 24² - 0² = 2(1.22)s
➤ 576 = 2.44s
➤ s = 576/2.44
➤ s = 236 m
Hope It Helps!Which statement accurately describes static electricity?
Th beste description for static electricity is that It is caused by separated positive and negative charges.
What is static electricity?Static electricity referes to electricity that is static or that do not flow.
It is caused by separated positive and negative charges.
Therefore, the best description for static electricity is that It is caused by separated positive and negative charges.
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Answer:
B
Explanation:
An arrow leaves a bow at 60 m/s at an angle of 30 degrees to the horizon.
60 m/s
30
Which best gives the total time of flight for the arrow before it returns to its original
height?
P.4C
Answer: 11
Explanation:
An object has a density of 0.755 g/mL. Its volume is 640 mL. What is its mass?
Answer:Density = 7.5 g/ml (By putting the given values.) [ The ratio of the mass to volume is the density, that's why the unit of the density is also the ratio of the unit of mass to the unit of volume. ] Hence, the density of the object is 7
Explanation: Google
(PLEASE ANSWER QUICKLY)
In the absence of friction, if a force acting on a moving object stops acting, the object will:
a. stop moving
b. keep moving at a constant speed
c. speed up
d. move at a slower speed
1 hr 16 minutes equal how many minutes ?
Answer:
76 minutes.
Explanation:
There are 60 minutes in an hour + 16 minutes= 76 minutes.
Which newton's law would best go with doing push ups?
Answer:
Newton's Third Law
Explanation:
According to Newton's third law of motion, forces always act in equal but opposite pairs. Another way of saying this is for every action, there is an equal but opposite reaction. This means that when you push on a wall, the wall pushes back on you with a force equal in strength to the force you exerted.
Use the drop-down menus to complete the statements.
A vertical column of elements in the periodic table is called a .
A horizontal row of elements in the periodic table is called a .
Atoms of elements in the same group have the same .
As you move from left to right on the periodic table, the atomic number .
Explanation:
A vertical column of elements in the periodic table is called a group
A horizontal row of elements in the periodic table is called a period
Atoms of elements in the same group have the same number of valence electrons
As you move from left to right on the periodic table, the atomic number increases
Answer: the first one is group
2. Period
3. Number of valence elections
4. increases
A train traveled at an average speed of 80 mph for 4.2 hours. Then, it traveled at an average speed of 60 mph for 1.5 hours. What was the total distance covered by the train?
Answer:
The answer is four hundred twenty six or 426
Answer:
426
Explanation:
A boat moving at a constant speed travels 15 meters in 8 seconds. How far does it travel
in 40 seconds?
O 75 meters
53 meters
335 meters
480 meters
The nucleus of most atoms is composed of which of the following sub-atomic particles? (A) tightly packed neutrons
(B) tightly packed protons and neutrons
(C) loosely connected protons and clectrons. (D) tightly packed protons.
Answer:
(B) tightly packed protons and neutrons
Explanation:
Nucleus of any atom is the dense central part of any atom.It consists of two sub-atomic particle namely proton and neutron.These sub-atomic parts are tightly packed in nucleus which makes the nucleus dense .This dense nucleus is responsible for most of the mass of atom.The atomic mass for any atom is decided by sum of the mass of proton and neutronThus, correct answer is
(B) tightly packed protons and neutrons
The nucleus of most atoms is composed of tightly packed protons and neutrons
The nucleus of an atom possess the following properties:
The nucleus are positively charged The nucleus are surrounded by a cloud of negatively charged electronsThe nucleus are very dense and small .The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are neutralThe nucleus contributes to most of the weight of an atom.Therefore, the nucleus is compose of tightly packed protons and neutrons
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When is the only time that an object has no kinetic energy?
Answer:
The only time an object has NO kinetic energy is when the velocity is "Zero"
Explanation:
The object starts out with no kinetic energy and potential energy of PE = mgh where m is the mass.The kinetic energy is zero. As the object falls it loses potential energy and gains kinetic energy KE = mv2/2.
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It is possible that when an object is stationary and not moving, it has no kinetic energy.
Only when an item is entirely at rest does it have no kinetic energy. The energy an object possesses as a result of its motion is known as kinetic energy. It is based on the object's mass and velocity.
When an object is not moving and has no velocity, it also has no kinetic energy.
According to the kinetic energy formula,
KE = 1÷2 × mass × velocity², if the velocity is zero, the entire term involving velocity becomes zero, resulting in zero kinetic energy.
Thus, when an object is stationary and not moving, it has no kinetic energy.
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You have $20 and your boss gives you $10
each second for 3s. How much money do
you have after 3s?
Answer:
$50
Explanation:
:) =)