Answer:
Does not stick to glass, expands uniformly when heated
Explanation:
If u want some more
Good conductor of heat
Low freezing point : - 39°C
High boiling point : 357°C
Have a good day, hope I helped
what’s the correct answer
According to 1st equation of motion :
[tex]\boxed{ \boxed{v = u + at}}[/tex]
where,
v = final velocityu = initial velocity a = acceleration t = timelet's solve for t
[tex] \hookrightarrow \: 17.63 = 0 + 2.13t[/tex]
[tex] \hookrightarrow \: t = \dfrac{17.63}{2.13} [/tex]
[tex] \hookrightarrow \: t = 8.276 \approx 8.28\: \: sec[/tex]
Any two importance of measurement
Answer:
to sell and to buy
Explanation:
measurement is a comparison between unknown quantity with a known quantity
Which of the following can be excluded when evaluating the reliability of a source? (1 point)
O accuracy of data
O timeliness of information
O purpose of the author
O length of content
D. Length of content.
Reliable sources need to be accurate, they need to make sense at the time they were created and the author needs to not be biased with their writing. It does not matter how long the content is as long as it is reliable.
A wheel of mass 4kg is pulled up a plane inclined at 30° to the horizontal by a force of 45N applied to the axle and parallel to the plane. If the wheel has a radius of 0.5m and the moment of inertia 0.5kgm?, calculate the translational velocity acquired after travelling 12m up the plane, assuming the wheel is initially at rest (6 marks)
Answer:
v = 10 m/s
Explanation:
Let's assume the wheel does not slip as it accelerates.
Energy theory is more straightforward than kinematics in my opinion.
Work done on the wheel
W = Fd = 45(12) = 540 J
Some is converted to potential energy
PE = mgh = 4(9.8)12sin30 = 235.2 J
As there is no friction mentioned, the remainder is kinetic energy
KE = 540 - 235.2 = 304.8 J
KE = ½mv² + ½Iω²
ω = v/R
KE = ½mv² + ½I(v/R)² = ½(m + I/R²)v²
v = √(2KE / (m + I/R²))
v = √(2(304.8) / (4 + 0.5/0.5²)) = √101.6
v = 10.07968...
What is the force on a 1,000 kg elevator that is falling freely at
25 m/s?
Explanation:
Force=mass*acceleration
Mass=1000kg
Acceleration=25m/s
F=1000*25
F=25000N
If for every kg of hydrogen converted to helium 0.0071 kg is converted to energy, what mass of hydrogen (in kg) must be consumed every second to fuel the Sun?
Answer:
Explanation:
630 trillion joules of energy
what is kinematics ???
what is it concerned with ??
Kinematics deals with the motion and time
It is concerned with motion
[tex] \huge \boxed{\mathfrak{Question} \downarrow}[/tex]
What's kinematics? What is it concerned with?[tex] \huge \boxed{\mathfrak{Answer} \downarrow}[/tex]
Kinematics is a branch of mechanical physics that deals with motion. It includes all types of motion & all ways of showing motion (like, through graphs, moving objects & so on). In short kinematics is the => geometry of motion.What phase of matter has the highest energy?
Answer:
plasma is the state with the highest energy level.
Convert the following in to SI units without changing its values
a. 4000 g
b. 2.4 km
hi <3
i believe i explained this answer properly in my last answer but it would be 4kg and 2400m as these are the SI units for these values.
hope this helps :)
hi :D
i believe i explained this answer properly in my last answer but it would be 4kg and 2400m as these are the SI units for these values.
hope this helps :)
A train accelerates from rest and covers a distance of 600m in 20s. What is the train's speed at the end of 20s? What is the final velocity of the train after 20s?
Answer:
v = 60 m/s
final velocity after 20 seconds depends on how long it continues to accelerate after 20 seconds. Also we do not know the direction to complete the velocity requirements of a scalar value and direction component.
Explanation:
If we assume that the acceleration is constant
d = ½at² = ½(Δv/t)t² = ½Δvt = ½(v - 0)t = ½vt
v = 2d/t
v = 2(600)/20 = 60m/s
If you are given force and time, you can determine power if you can know
(a) watts
(b) energy
(c) distance
Answer:
joules/energy.
Explanation:
power is defined as the rate of work. Hence power=work/time, then you obtain Watts.
Work is the product of force and displacement.
what is a law in physics? state the criteria for a statement to be a law.
Answer:
By nature, laws of Physics are stated facts which have been deduced and derived based on empirical observations. Simply put, the world around us works in a certain way, and physical laws are a way of classifying that “working.”
In Physics, a law can be defined as a type of scientific statement or statement of fact that is generally accepted to be true and universal because it has always been observed to be true.
Some examples of laws that are universally accepted include;
Law of Conservation of Momentum. Law of Conservation of Energy. Newton's First Law of Motion. Ohm's law.On a related note, the criteria that must be met for a statement to become acceptable as a law is that, it must be supported by observations and the results of control experiments.
Furthermore, the statement must give rise to factual or evidential information, theories and must proffer a solution to a particular problem.
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What is difference between simple microscope and compound microscope
Answer:
simple microscope - a codenser lens is not required I simple microscopes .
compound microscope- the condenser lens is embedded in compound microscopes for adjusting the intensity of the light to magnify the object.
Explanation:
hope this helps you
mrk me brainiliest
Convert the following in to SI units without changing its values a. 4000 g. b. 2.4 km
#A
[tex]\boxed{\sf 1kg=1000g}[/tex]
[tex]\\ \sf\longmapsto 4000[/tex]
[tex]\\ \sf\longmapsto \dfrac{4000}{1000}[/tex]
[tex]\\ \sf\longmapsto 4kg[/tex]
#B
[tex]\boxed{\sf 1km=1000m}[/tex]
[tex]\\ \sf\longmapsto 2.4km=2.4(1000)[/tex]
[tex]\\ \sf\longmapsto 2400m[/tex]
Which is an accurate statement about a magnetic field's direction?
The magnetic field goes from the north pole to the south pole.
The magnetic field goes from the south pole to the north pole.
The direction of the magnetic field depends on the strength of the field.
The magnetic field depends on if the magnet is man made or natural
The direction of a magnetic field can be accurately described as flowing from the north pole to the south pole,
What is a magnetic dipole?When considering the idea of a magnetic dipole, it involves having two magnetic poles that possess equal strength but differ in polarity. This particular configuration results in the creation of a magnetic field that flows from the north to south pole. The magnitude of this field is determined by the size of the magnetic dipole moment, which serves as a distinctive quality of the magnet.
Which is an accurate statement about a magnetic field's direction?The idea of a magnetic field pertains to a specific region in space that can exert magnetic force on either a magnet or a charged particle in motion. The orientation of the magnetic field lines indicates the direction of the force that would affect any magnetic object within the field. It's important to note that these lines always form closed loops, originating from the north pole of the magnet and extending through surrounding space before ultimately returning to enter at its south pole. This implies that without fail, magnetic field lines travel from north to south pole, with this directional flow being reliant on the magnet's magnetic dipole moment.
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2. Determine the units of the quantity described by each of the following
combinations of units:
a. kg (m/s) (1/s)
b. (kg/s) (m/s)
c. (kg/s) (m/s)
d. (kg/s) (m/s)
We have that the unit of the quantities are described
a.kg (m/s) (1/s)=Newton
b. (kg/s) (m/s^2)=Newton
c. (kg/s) (m/s)^2=Newton
d. (kg/s) (m/s)=Newton
From the question we are give the units
a.kg (m/s) (1/s)
b. (kg/s) (m/s^2)
c. (kg/s) (m/s)^2
d. (kg/s) (m/s)
a)
Generally
kg (m/s) (1/s) is Represented as Newton
Where Newton is the unit Force and Weight
b)
Generally
(kg/s) (m/s) is the unit representation of Newton
Therefore
Newton
c)
kg/s) (m/s) is the unit representation of Newton
Therefore
Newton
d)
Generally
(kg/s) (m/s) is the unit representation of Newton
Therefore
Newton
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In order to have a good hypothesis, which of the following are needed:
Answer:
There must be a possibility to prove that the hypothesis is true. There must be a possibility to prove that the hypothesis is false. The results of the hypothesis must be reproducible.
Explanation:
Make sure your hypothesis is "testable." To prove or disprove your hypothesis, you need to be able to do an experiment and take measurements or make observations to see how two things (your variables) are related. You should also be able to repeat your experiment over and over again, if necessary
find application in physics that are mention and discuss
Answer: Application of physics:
describing the motion, forces and energy of ordinary experience. In actions such as walking, driving a car or using a phone, physics is at work. For everyday living, all the technologies you might take for granted exploit the rules of physics.
.
BONUS: Usain Bolt speeds up from 0 m/s to 22 m/s in
55 seconds. What is his acceleration in meters per
minute (Round answer to nearest whole number)?
Answer:
0.4 meters per second I believe
6. A journalist is testing the acceleration of a new car. He measures the final velocity of the car to be 15 m/s. If the
car was initially stopped 10 s before the journalist made her measurement, what is the car's acceleration?
Answer:
1.5 m/s^2
Explanation:
Don't rlly understand the question, but I'll just take it as the initial velocity is 0
a = 15 - 0
- - - - - -
10
= 1.5 m/s^2
What is the displacement of a car traveling 14 km North on I985 then 20 km South on I985?
Displacement = (14-20) Km = -6 Km
The displacement of a car is -6 Km South
what conditions might a cause scientist to modify or revise a hypothesis
Answer:
scientists might modify or revise a hypothesis after a trial run that didn't go how they thought.
What is LCR circuit??
An LCR circuit is a circuit which has Inductors , Capacitor and Resistors connected to each other in an specific way.
An RLC circuit is an electrical circuit consisting of a resistor, an inductor, and a capacitor, connected in series or in parallel. The name of the circuit is derived from the letters that are used to denote the constituent components of this circuit, where the sequence of the components may vary from RLC.
why do we observe winds blowing towards the equator
Answer:
The cooler air from region of up to 30degree latitude belt on both sides of the equator ,rushes toward the equator ,to take the place of warm rising air. This makes the wind to blow from north and south direction toward equators
Bella makes the 2.5m distance to her food bowl in 9.1 seconds. What is her average velocity?
Average Velocity=Total Distance/Total Time
[tex]\\ \sf\longmapsto \dfrac{2.5}{9.1}[/tex]
[tex]\\ \sf\longmapsto 0.3m/s[/tex]
what is an adam and a moreculw and a half note ???
explain 3points to be taken into consideration while measuring the length of a body
Answer:
Y T and v
Explanation:
can a physical quantity have unit but is dimensionless?
Answer:
i might be wrong here, but i`m pretty sure dimensionless things are infinite, and infinity can not be defined by a single quantity.
for example, since space is constantly expanding, it never has and never will have an actual measurement of any sort.
A car is accelerating at 6 m/s2. How long would it take the car to go 12 m/s faster?
Answer:
2 seconds
Explanation:
Each second, it increases its speed by 6 m/s, so it will take 2 seconds for the speed to increase by 12 m/s.
A man walks his dog on a very straight path in a park. He can walk back and forth as slow or fast as he wants to, but he has to stay on the path. Which of the following statements is correct for an arbitrary time interval?
a. His average speed can be greater than the magnitude of his average velocity.
b. His average speed can be less than the magnitude of his average velocity.
c. Since he is walking along a straight path, his average acceleration must be zero.
d. His average velocity must be zero.
Answer:
a. His average speed can be greater than the magnitude of his average velocity.
Explanation:
As speed is distance traveled over time traveled, this is always greater than zero if he has moved at all.
velocity is displacement over time traveled. As the man is allowed to return to the point of origin, his velocity at some point might be zero while his speed is positive.
