Answer:
The total speed is 5.3 m/s
Explanation:
The speed of river = 3.6 m/s
The speed of the tube that a boy use for downstream = 1.7 m/s
Now we have to find the total speed of the boy in the case of downstream. However, in this case, the total speed can be determined by adding both the given speeds.
The total speed = Speed of rive + speed of the tube
Total speed = 3.6 + 1.7
Total speed = 5.3 m/s
Consider the pendulum. At what point is the kinetic energy the greatest?
Answer:
B
Explanation:
B is the mean position.At the mean position, the velocity of the particle in S.H.M. is maximum and displacement is minimum, that is, x=0. Therefore, K.E. = 1/2 k ( a² – x²) = 1/2 k ( a² – o²) = 1/2 ka². Thus, the maximum kinetic energy is expressed by K.E = ½ ka²
Answer:
Point B is the location of the greatest kinetic energy. This is the point where the pendulum is moving with the greatest velocity.
Explanation:
based on what you have just read,why is studying atoms and their parts and particles helpful to people
The study of atomic structure helps us understand more about the way the universe is constructed, how our bodies are made, and the components of life, which we can apply to other sciences in the fields of health and disease prevention, fuels, product industry etc... It basically helps us to understand how we can make new things and how to utilize the power of the universe.
Answer: Studying atoms is important because knowledge about atoms helps people to understand the world around them and produce materials used in daily life. Also, research done on atoms has contributed to the improvement of people's lives through medicine, to the protection of the environment, and to the discovery of new things about the world and the universe.
Explanation:
I did the test
Calculate the acceleration of a 23.9 kg mass when a net force of 158N north acts on it. Answer is 6.61ms^-2 north. Need to know how to get there.
Answer:
formula F = m * a
Explanation:
F = m * a
F = force = 158 N
m = mass = 23.9 kg
a = acceleration
158 = 23.9 * a
a = 158 / 23.9
a = 6.61m/s²
therefore, use the formula F = m * a
Pelo nossa observaçao do cotidiano,podmos perceber facilmente que se uma pedra for largada do alto de um predio , ele ira se deslocar em direçao ao solo ,enquanto que a fumaça produzida pela queima da madeira sobe para os ceus. Como aristosteles explicava estes movimentos?
Answer:
Esses movimentos são movimentos naturais.
Explicação:
Se uma pedra cair do topo de um telhado ou edifício, a pedra se moverá em direção à terra, enquanto a fumaça produzida devido à queima da madeira vai para cima, então de acordo com Aristosteles esses tipos de movimento são chamados de movimento natural porque de acordo à definição de movimento natural que não requer nenhuma força, então esses dois movimentos também se movem na direção para baixo e para cima sem usar qualquer força, então podemos dizer que esses movimentos são naturais.
Attempt 3 of 2
SECTION 10F1
QUE
1 2 3 4 5 6 7
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Which of the following will stay constant, no matter if the substance is in the solid, liquid, or gas state?
volume
shape
temperature
mass
Answer:
mass.
Explanation:
other physical factors are changeable but the mass of a particular substance is always constant.
An object accelerates 20.8 m/s2 when a force of 8.9 newtons is applied. What is the mass of the object?
Answer: 0.43kg
Explanation: a = 20.8m/s^2
F = 8.9N
m = ?
F = ma
8.9 = 20.8m
m = 8.9/20.8
= 0.43kg
Hope this helped..
who was albert einstien describe his contributions???
Answer:
Albert Einstein was from Germany he was born theoritical physicist, from childhood only he loved mechanical toys, he was highly gifted in Mathematics, He was a world citizen and a scientific genius too. His contribution were:
1) he developed the theory of relativity
2) he also discovered the process of nuclear fission
3)he developed the quantum theory of specific heat
4)theory of stimulated emission, on which laser device technology is based
5) law of photoelectric effect
hope it helped you :)
A net force of 10 N accelerates an object at 5.0 m/s^2. What is the mass of the object? A. 2 kg B. 10 kg C. 5 kg D. 20 kg
Answer:
A. 2 kg
Explanation:
[tex]Force = 10N\\Acceleration = 5.0m/s^2\\Mass = ? = x\\Force = mass\times acceleration \\10 = x \times 5\\10 = 5x \\\frac{10}{5} =\frac{5x}{5} \\2=x\\\\Mass= 2kg[/tex]
How long is the racetrack if it takes a racecar 3.4 s travelling at 75 m/s to finish?
Answer:
255 metres
Explanation:
The answer to thi question is actually quite simple. Since the car goes for 3.4 seconds, and it goes 75 metres every second, the answer is just 3.4 multiplied by 75 Metres.
When do we represent objects like a point like object?
a body of mass 0.5kg is shot vertically into the air with an initial speed of 45m/s
, calculate the time taken to reach the maximum height
Answer:
The time to reach the maximum height is approximately 4.59 seconds
Explanation:
The maximum height in a problem where friction with the air is neglected, only needs the kinematic information of the initial velocity at which the object was launched vertically.
Recall that the formula for the velocity of an object under constant acceleration ([tex]a[/tex]) in terms of time (t) is given by:
[tex]v(t)=v_0+a\,\,t[/tex]
where [tex]v_0[/tex] is the initial velocity of the object (in our case the speed at which it was launched up in the air = 45 m/s)
Considering that the acceleration the object is subjected (which is the acceleration of gravity g = 9.8 m/s^2) is acting in opposite direction to the initial velocity of the object, we make sure to include a negative sign in the formula:
[tex]v(t)=v_0+a\,\,t=v_0-g\,\,t[/tex]
then, considering that at the time the object reaches its maximum height, is when it stops and starts it motion back towards earth, that is the point at which the object's velocity is zero. Then we can solve for the time as follos:
[tex]0=v_0-g\,\,t\\g\,\,t=v_0\\t=\frac{v_0}{g} \\t=\frac{45}{9.8} \\t\approx 4.59\,\,sec[/tex]
a. In what frame of reference does special relativity apply?
b. In what frames must general relativity be used?
c. Describe what happens to time and length at speeds close to the speed of light.
Answer:
a. The Special relativity postulate states that the laws of physics apply in all inertia frames of reference
b. General relativity must be uses a curved space-time
c. Time is dilated for a stationary observer relative to one in motion
Time interval observed on an object in a moving frame of reference is less than the same interval observed on a stationary reference frame
[tex]\Delta t' = \dfrac{\Delta t}{\sqrt{1 - \dfrac{v^2}{c^2}}}[/tex]
Length is contracted
The length of a rod moving with a velocity relative to an observer will appear contracted by a factor [tex]\sqrt{1 - \dfrac{v^2}{c^2}}[/tex], in the direction of the motion.
Explanation:
What is the force per meter of length on a straight wire carrying a 6.40 A current when perpendicular to a 0.9 T uniform magnetic field
Answer:
5.76 N/m
Explanation:
From the question,
F = BILsinФ...................... Equation 1
and then,
F/L = BIsinФ.................. Equation 2
Where F/L = force per meter, I = current, B = magnetic field, Ф = angle.
Given: B = 0.9 T, I = 6.4 A, and Ф = 90° (Perpendicular)
Subtitute these values into equation 2
F/L = 0.9(6.4)(sin90°)
F/L = 5.76 N/m
The force per meter of length on a straight wire will be 5.76 N/m.
What is a magnetic field?It is the type of field where the magnetic force is obtained. With the help of a magnetic field. the magnetic force is obtained it is the field felt around a moving electric charge.
The given data in the problem si;
B is the megnetic field=0.9 T
I is the current = 6.4 A,
Ф is the angle = 90° (Perpendicular)
The megnetic field is found as;
[tex]\rm F= BILsin \phi \\\\ \frac{F}{L} =BIsin\phi \\\\ \frac{F}{L} =0.9 \times 6.4 \times sin 90^0\\\\ \frac{F}{L} =5.76 / N/m[/tex]
Hence the force per meter of length on a straight wire will be 5.76 N/m.
To learn more about the magnetic field refer to the link;
https://brainly.com/question/19542022
a homer in in a baseball game was measured at 450 feet. how many meters is this equal to?
A waiter is carrying a tray above his head and walking at a constant velocity. If he applies a force of 5.0 newtons on the tray and covers a distance of 10.0 meters, how much work is being done?
Answer:
0 J
Explanation:
Work is the dot product of force and displacement. In other words, it is the force times the distance traveled in the direction of the force.
W = Fd cos θ
In this case, the force is vertical and the displacement is horizontal. So the angle between them is θ = 90°. The work done is:
W = (5.0 N) (10.0 m) cos(90°)
W = 0 J
What is the more common term for a quantitative
observation?
Answer:
Measurement
Explanation:
Scientific research require observation and there are two types of observations, quantitative and qualitative observation
Collecting quantifiable data that is possible to be expressed in a number format is said to be a quantitative observation
Quantitative observation can also be described as observations that are defined by both words and numbers and they are therefore more useful than qualitative observations that involve only words
Quantitative observations involve expressions of variables that are quantifiable, that is material hat can be expressed in numbers.
Answer:
Measurement
Explanation:
if you’re doing ck12 it’s the right answer
In which place moutain or terai,the value of g is more and why?
Answer:
the radius of the earth in himalayan region is greater than terai reagion. therefore, the value of 'g' at the poles is greater than the value of g at the equator. 12
Explanation:
plz mark as brainlist thx :)
By definition, a molecule carries a net charge of _____.
How many atoms of hydrogen are there in one molecule of water, if the chemical formula is H2O? 0 1 2 3
Answer:
2
Explanation:
H2O has -
2 hydrogen atoms
1 oxygen
Answer: 2
Explanation:
determine the density in si unit of a solid of mass 40g with dimension 30cm by 4cm by 3cm
Answer:
Density = 0.111 g/cm^3
Explanation:
Given that
Make m = 40g
The given dimension are 30cm by 4cm by 3cm
Volume V = 30 × 4 × 3 = 360 cm^3
Density is the ratio of mass to volume.
That is,
Density = mass/volume
Substitute mass and volume into the formula
Density = 40/360
Density = 0.1111 g/cm^3
FOR 30 points
Part 3
What single property was the most important in Jesseca's material?
Answer:
Jesseca wanted to create a material that reflected most of the light that fell on it.
Explanation:
Plato Answer
Answer:
this is the exact answer on Edmentum...
Explanation:
Jesseca wanted to create a material that reflected most of the light that fell on it.
During which step of the scientific method does a scientist make an educated
guess about the outcome of an experiment?
A. Collect data
B. Form a hypothesis
C. Analyze the results
D. Design an experiment
Answer:
form a hypothesis
Explanation:
What does perseverance mean to you?
What steps should be taken when using a fire extinguisher? pull, aim, squeeze, spread pull, arm, search, spread push, aim, spread, squeeze push, arm, spread, search
Answer: pull,aim,squeeze,spread
Explanation:
Which force affect the movement of aeroplane and ship?
Give reasons:
1. The unit of pressure is a derived unit.
Explanation:
The units of pressure is called derived units because it is simply derived from base unit which is distance and a derived unit which is force, which is derived from acceleration, a derived unit as well, and mass, a base unit. As we all know, work is defined as the force x distance. Thus making work a derived unit.
Since all stars begin their lives with the same basic composition what characteristics most determines how they will differ
Answer:
Mass they are formed with
Explanation:
All stars are born with the same composition such as one quarter of helium, three quarter of hydrogen, and heavier element does not found more than two except their mass. Mass that differ all stars from other stars they born with. How much the mass of a star is large , the star would be as messy.
For example our sun is a star and have large mass four times greater than other living stars. It is found that smallest mass is around 1/12th of sun mass. The masses of a star is determined by its orbit binary. Sun is called a brown dwarf.
If a tennis ball has a velocity of 18 m/s and a momentum of 1.06 kg. m/s, what is the mass of the tennis ball in grams?
Round the answer to two significant figures.
Blank grams
Answer:
59g
Explanation:
The tennis ball with a velocity of 18 m/s and momentum of 1.06 kg m/s then the mass of the tennis ball in grams will be 59 grams (approx) two significant figures.
What is Momentum?Regardless of the frame of reference, momentum is a conserved quantity in any inertial frame, which means that if an enclosed system is not subject to outside influences, its total linear momentum remains constant.
Additionally, momentum is preserved in general relativity, electrodynamics, quantum mechanics, quantum field theory, and special relativity (using a modified formula). It is a manifestation of translational symmetry, one of the basic symmetries of space and time.
According to the question, the given values are :
Velocity, v = 18 m/s
Momentum, p = 1.06 kg m/s
p = m × v
1.06 kg m/s = m × 18 m/s
m = 1.06 / 18
m = 0.0589 kg or
m = 58.9 grams or 59 grams approx in two significant figures.
So, the mass will be 59 grams.
To get more information about Momentum :
https://brainly.com/question/4956182
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Which of the following is a limit of science? (2 points) a The technology or tools available to test scientific claims b The number of times an experiment can be repeated c The total number of scientists in a field, like physics or chemistry d The use of critical thinking and evidence to study phenomena
Answer: A- The technology or tools available to test scientific claims. I just took this test and passed.
Identify two properties of a star that can be determined from its spectral class
Answer:
temperature and relative motion
Explanation: