Answer:
maybe the sign says something mean
Explanation:
PLEASE HELP ASAP
A physics student is adjusting the settings of their projectile launcher. If the VX =28 m/s and the Vy = 15 m/s, what is the magnitude of its velocity?32 m/s
13 m/s
43 m/s
1009 m/s
Answer:
The first choice (32m/s) is the closest to the answer
Explanation:
The magnitude of a vector is the distance between the initial and the end point of the vector.
Being Vx and Vy the horizontal and vertical components of the vector V respectively, the magnitude of V is calculated as:
[tex]\mid \vec{V} \mid =\sqrt{V_x^2+V_y^2}[/tex]
The components of the velocity of the physics student's projectile launcher are Vx=28 m/s and Vy=15 m/s.
Calculate the magnitude of the velocity:
[tex]\mid \vec{V} \mid =\sqrt{28^2+15^2}[/tex]
[tex]\mid \vec{V} \mid =\sqrt{784+225}[/tex]
[tex]\mid \vec{V} \mid =\sqrt{1009}[/tex]
[tex]\mid \vec{V} \mid =31.8 \ m/s[/tex]
The first choice (32m/s) is the closest to the answer
If a ball is rolled down a frictionless inclined plane from a height of 3 feet, to what height would it roll up to on the other side?
Answer:
It will roll up to its initial height from which it rolled from on the first hill
Explanation:
The given information are;
The height from which the ball is rolled = 3 feet[
The equation of the potential energy of the ball as it rolled down the frictionless inclined plane is given by the following equation;
m × g × h₁ = 1/2 × m × v² + 1/2×[2/5× m × r²) × [v/r]
Where;
m = The mass of the ball
h = The from which the ball is rolled down
v = The velocity of the ball
r = The radius of the ball
Therefore, all the potential energy, m × g × h, is converted into kinetic energy when the ball reached the ground
Similarly, as the ball rolls up on the other side, by the principle of energy conservation, all the kinetic energy is transformed into potential energy as follows
1/2 × m × v² + 1/2×[2/5× m × r²) × [v/r] = m × g × h₂, therefore, we have;
1/2 × m × v² + 1/2×[2/5× m × r²) × [v/r] = m × g × h₁ = m × g × h₂
Therefore since m × g × h₁ = m × g × h₂, then h₁ = h₂, the ball rises to the same height it started rolling from on the first hill.
Karissa is conducting an experiment on the amount of salt that dissolves in water at different temperatures. She repeats her tests several times using the same procedure.
What can Karissa do to further increase confidence in the results of her experiment?
have another scientist run the same exact procedure in her lab
include several other liquids for comparison
calculate the average amount of salt that dissolves to summarize findings
make sure the experiment follows a specific procedure that allows other scientists to produce the same findings
Answer:
C.) Calculate the average amount of salt that dissolves to summarize findings
Explanation:
Just telling you, nobody reads these things. They just look at the answer and say oh i got it right now but you should bc i got a 50 on this quiz and this was one of them that was right so believe me when i say, i got this question right. UwU <333333333
Answer:
Calculate the average amount of salt that dissolves to summarize finding
-The third choice/ C-
Have a good day :)
what does boiling point mean?
Answer:
The temperature at which a liquid boils and turns to vapor.
Explanation:
Boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature. therefore the water is at its boiling point.
Answer:
When a substance starts to boil, like 212° F, that is considered boiling point.
which refers to the distance between two crests or two troughs on a transverse wave?
wavelength
amplitude
frequency
hertz
Answer:
wavelength
Explanation:
the definition of wavelength is the distance from one Crest to the next crest,or one trough to the next trough
The phenomenon that refers to the distance between two crests or two troughs on a transverse wave is wavelength.
What is wavelength?Wavelength is simply defined as the distance between successive crests of a wave, particularly in a sound.
In conclusion, wavelength refers to a traveling particle.
Read more about Wave
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A 68 kg runner exerts a force of 59 N. What is the acceleration of the
runner?
0 m/s2
1.16 m/s2
4012 m/s2
0.87 m/s2
d) ≈ 0.87 m/s²
Explanation:Hi there !
Newton's second lawF = m×a => a = F/m
a = 59N/68kg
1 N = 1kg·m/s²
= (59kg·m/s²)/68kg
= 0.8676 m/s²
≈ 0.87 m/s²
Good luck !
How are representative democracies and direct democracies similar?
In both, elected officials meet to make laws.
The power lies with the people in both types of government.
Both types of government work well in countries with large populations.
In both, citizens often represent themselves in voting on government decisions.
BRAINLYIST IS THE REWARD
Answer:
The answer is Both types of government work well in countries with large populations.
Explanation:
Answer:
its d
Explanation:
PLS HELP, WILL MARK BRAINLIEST!!!
A bowling ball has a mass of 5kg and weight of 49 Newtons on Earth. Astronauts take it on a journey to the moon, Phobos (a moon of Mars) and Jupiter and measure the bowling ball’s weight. Put the locations in order from least weight to most weight for the bowling ball.
(1 Point)
Earth
Jupiter
The Moon
Phobos
Answer:the moon, earth, phobos,and jupiter
Explanation:i hope im right
kenneth warmed up a 100- ml sample of air in and expandable container. he displayed the resluts in the following graph. the resluts formed a straight line, so he extended the line the full length of the graph
Answer:
300,000
Explanation:
Suppose a pendulum starts with a potential energy of 100 J. Assuming the pendulum has a height of 0 m at the bottom of its swing, what is its maximum kinetic energy?
Answer:
100...................
An object is dropped from rest.
Calculate its velocity after 2.5 seconds
Choose a sport you like, such as football or gymnastics. Describe how a high level of flexibility would affect your performance in that sport. Consider the benefits in many aspects of the sport.
The level of flexibility will affect my performances in football. Football
requires some level of flexibility to do certain things.
Flexibility will enable me change speed and direction easily when there is a
counter attack by the opponents. It will also assist in using some techniques
such as adding more curve on the football with the feet in order to score
goals.
Flexibility will also ensure that there will be lesser injury concerns because there will be less sprains or other muscle related injuries.
Read more on https://brainly.com/question/18472626
Light passing through the center of a lens will carry on undeviated.
Select one:
a. False
b. True
Answer: true
Plz mark brainliest:)
Sorry if it’s blurry. Please help. I can’t mess up.
answer:
MAXIMUM SPEED
explanation:
IM SURE THAT IS THE ANSWER
A jumpy squirrel is trying to cross the street. Its velocity v as a function of time t is given in the graph
below where rightwards is the positive velocity direction
v (m/s)
3
4
-2-+
-3
-4-
-5
What is the squirrel's displacement Au from t = 1s to 2 s?
Answer with two significant digits.
m
Show Calculator
Answer: 2.5 m
Explanation: 1/2(1s)(5m/s)
=2.5.
Got it from Khan Academy
A gymnast pushed down on a trampoline during a routine. What is the reaction
force on the gymnast?
a) Friction pushes the gymnast forward across the trampoline.
b) Gravity pulls down on the gymnast.
c)Air resistance pushes back on the gymnast
d) The trampoline pushes back up on the gymnast.
Answer:
d) The trampoline pushes back up on the gymnast.
Explanation:
According to Newton's third law of motion; for every action force, there is an equal and opposite reaction force. The action force and reaction force are reciprocal to one another i.e. they act oppositely to one another. The reaction force acts in an opposite direction to the action force and vice versa.
In this question, a gymnast pushed down on a trampoline during a routine. This is called the ACTION FORCE. In conformity to Newton's third law, the trampoline pushes back up on the gymnast. This opposite force is called the REACTION FORCE.
Answer:
D) the trampoline pushes back up they gymnast
Explanation:
Neutrons have a ____ charge
Answer:
Neutrons have no charge
Explanation:
Answer:
Neutrons don't have a charge....
Explanation:
Hope this helped!!!
what caused earths continents to drift apart?
Answer:
bada bop boop pow
Explanation:
PLEASE HELP! Which event is an example of vaporization?
A. Fog forms in a valley.
B. People see their breath on a cold winter day.
C. Dew forms on the leaves of a tree.
D. A spilled drop of rubbing alcohol.
Answer:
A. Fog forms in a valley
a car travels 200m in 30 s and 400m in the next 90s. Whats the average speed?
Answer:
300m per minute or 5m per second
in an observational study researchers try not too ?
They try not to influence the subjects
Explanation:
What happens when your wearing socks and you shuffle across a carpet then touch a door knob?
Answer:
You build up kinetic energy and you get shocked this happens because static has built up from the socks and the rug. This also happens when you rub a balloon on your head or shuffle across a trampoline with socks on.
Explanation:
brainliest plz
5 points Place the descriptions of the atomic models in order from oldest to most-recent. Oldest Atomic Model 1 Solid ball, no subatomic particles. 2 A dense nucleus with protons and neutrons is in the center of the atom. The electrons travel around the nucleus in distinct energy levels. 3 # The atom is mostly empty space. A dense nucleus with protons and neutrons is in the center and electrons travel around it randomly. 4 Solid ball of positive materials with electrons scattered throughout. (Plum Pudding Model) Сл A dense nucleus with protons and neutrons in the center of the atom. The electrons are found in "electron clouds" which surround the nucleus. Electron cloud show where electrons are likely to be, but not exactly where they are. Most-recent atomic model. How would I put them in order?
Answer:
1 Solid ball, no subatomic particles.
4 Solid ball of positive materials with electrons scattered throughout. (Plum Pudding Model)
3 # The atom is mostly empty space. A dense nucleus with protons and neutrons is in the center and electrons travel around it randomly.
2 A dense nucleus with protons and neutrons is in the center of the atom. The electrons travel around the nucleus in distinct energy levels.
Сл A dense nucleus with protons and neutrons in the center of the atom. The electrons are found in "electron clouds" which surround the nucleus. Electron cloud show where electrons are likely to be, but not exactly where they are.
Explanation:
1 Solid ball, no subatomic particles. This model was proposed by some Greek Philosophers and John Dalton in 1803. That matter was made up of small indivisible substances called atoms.
4 Solid ball of positive materials with electrons scattered throughout. (Plum Pudding Model). This model was proposed by JJ Thomson in 1904. That the atom contained a large positively charged ball with negative charges scattered about.
3 # The atom is mostly empty space. A dense nucleus with protons and neutrons is in the center and electrons travel around it randomly. This model was proposed by Ernest Rutherford in 1911. The center of the atom was dense and positively charged with protons and neutrons surrounded by electrons orbiting it and most of the space between the nucleus and the electron orbit empty.
2 A dense nucleus with protons and neutrons is in the center of the atom. The electrons travel around the nucleus in distinct energy levels. This model was proposed by Niels Bohr in 1913. This was due to the fact that atoms only emit light at certain wavelengths which would imply that they have discrete energy levels which the electrons are contained in.
Сл A dense nucleus with protons and neutrons in the center of the atom. The electrons are found in "electron clouds" which surround the nucleus. Electron cloud show where electrons are likely to be, but not exactly where they are. This model was proposed by Erwin Schrodinger in 1926 through the solution of the Schrodinger wave equation. The position of the electron is assumed to to be a probability in an electron cloud.
A 3,000kg car rests on rough horizontal ground. A rope is
attached to the car and is pulled with a force of 11,000N to the
left. As a result, the car accelerates at 3 m/s2. The coefficient of
sliding friction (1) between the car and the ground is?
Answer:
0.07
Explanation:
Huge Brain
Coefficient of friction between the car and the ground will be 0.07.
Given in the question,
Mass of the car 'm' = 3000 kgForce 'F' by which the car is pulled = 11000 NAcceleration 'a' by which the car gets accelerated = 3 meters per second²Force applied on the car by which the car is accelerated,
F = ma
= 3000 × 3
= 9000 N
Force [tex]F_k[/tex] to overcome the friction = 11000 - 9000
= 2000 N
Gravitational force F' on the car = mg
= 3000(9.8)
= 29400 N
Since, [tex]\mu_k=\frac{F_k}{F'}[/tex]
[tex]=\frac{2000}{29400}[/tex]
[tex]=0.068[/tex]
≈ 0.07
Therefore, coefficient of friction between the car and the ground will be 0.07.
Learn more,
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What is better for measuring how hard you are actually working, Target Heart Rate or Rating of perceived exertion?
Answer:
Rating of percieved exertion
If Thor throws his axe horizontally at a velocity of 50 m/s at and a height of 20 m, how long does it take before it hits the ground? (gravity is 9.8 m/s^2)
Answer:
The time taken before the axe hits the ground is 0.385 s.
Explanation:
Given;
initial velocity, u = 50 m/s
height above ground, h = 20 m
To determine the time taken before the axe hits the ground, apply the following kinematic equation;
h = ut + ¹/₂gt²
20 = 50t + ¹/₂(9.8)t²
20 = 50t + 4.9t²
4.9t² + 50t - 20 = 0
Solve this quadratic equation;
a = 4.9, b = 50, c = -20
t = 0.385 s
Therefore, the time taken before the axe hits the ground is 0.385 s.
how long does it take sound to travel the distance between the two microphones? Given.:wave 1 of microphone 1 has T=2 sec and f=1/2Hz and the speed of propagation of the sound is 330m/s
Answer:
0.00583 seconds
Explanation:
2. A person standing at
the edge of a seaside
cliff kicks a stone over
the edge with a speed of
18 m/s. The cliff is 52 m
above the water’s surface, as shown at right.
How long does it take
for the stone to fall to
the water? With what
speed does it strike the
water?
According to Rahul any two bricks tied together would fall faster than a single
one under the action of gravity by neglecting air resistance. Do you agree with
Rahul? Give a reason to support your answer.
Answer:
Rahul is wrong.
Explanation:
From Newton's universal law of gravitation, we know that the force of attraction between two falling body masses is directly proportional to product of masses of two bodies and has an inverse proportional relation with the square of the distance between the masses.
If the 2 masses are M1 & M2, while distance between them is d, this can be written as;
F ∝ M1•M2
And F ∝ 1/d²
We also know that the acceleration due to gravity is given as;
g = GM/r²
Where;
M is the mass of earth
r is the radius of earth
From the above 3 formulas, we can deduce that the value of the acceleration due to gravity(g) is independent of the 2 masses of the falling body as it depends on only the mass of the earth and radius of the earth.
This means that the acceleration due to gravity will be the same whether the bricks are doubled or whether it remains single.
Thus, they will fall with same velocity in each case. So Rahul is wrong.
A boat moving at a constant speed travels 15 meters in 8 seconds. How far does it travel
in 40 seconds?
0 75 meters
53 meters
335 meters
0 480 meters
Answer:
75m
Explanation:
Given parameters:
Distance covered by the boat = 15m
Time taken = 8s
Unknown:
Distance covered by the boat in 40s = ?
Solution:
To solve this problem, we need to find the speed of the boat first;
Speed = [tex]\frac{distance}{time}[/tex]
Insert the parameters and solve;
Speed =[tex]\frac{15}{8}[/tex] m/s
Now;
The boat will travel;
Distance = speed x time
Distance = [tex]\frac{15}{8}[/tex] x 40 = 75m
