Answer:
Explanation:
Consider the initial position of the frog (20 m above ground) as the reference position. All measurements are positive measured upward.
Therefore,
u = 10 m/s, initial upward velocity.
H = - 20 m, position of the ground.
g = 9.8 m/s², acceleration due to gravity.
Part (a)
When the frog reaches a maximum height of h from the reference position, its velocity is zero. Therefore
u² - 2gh = 0
h = u²/(2g) = 10²/(2*9.8) = 5.102 m
At maximum height, the frog will be 20 + 5.102 = 25.102 m above ground.
Answer: 25.1 m above ground
Part (b)
Let v = the velocity when the frog hits the ground. Then
v² = u² - 2gH
v² = 10² - 2*9.8*(-20) = 492
v = 22.18 m/s
Answer: The frog hits the ground with a velocity of 22.2 m/s
why do athletes stretch before the game??? and hii pls help
Answer:
to stretch their muscles so they don't strain or hurt themselves
Explanation:
hi!
Answer:
it's kinda like a warm up. they're getting their body ready for extreme physical activity.
Explanation:
hope it helps, and hi
A. B. C. D.
-___________
Convert 0.0000004372896 to scientific notation.
Why is climate changing?
Answer:
because the seasons are changing?
Answer:
Climate is changing because we have seasons.
Explanation:
Joe throws a ball straight down a 100 m building with a velocity of 5 m/s. How long does it take the ball to reach the ground?
5. Gravitational and magnetic forces are examples of _______forces.
6_______are forces that are equal in magnitude but opposite in
direction
7.__________are forces that cause a change in the motion of an object.
8. The sum of all forces acting in an object is called________
9. If the forces in an object are balanced, the net force is________
10. If the forces in an object are unbalanced, the net force is________
Answer:
Explanation:
5.non contact force
6.balanced force
7.unbalanced force
8.net force
9.zero
10.is the difference between two forces
mark me as brainliest please
The correct terms for the question are listed below
.non contact force
balanced force
unbalanced force
net force
zero
is the difference between two forces
Gravitational as well as magnetic forces can be regarded as one of the examples of non contact forces.Balance forces can be regarded as a force equal in magnitude and the force I still opposite in direction
Unbalance forces can be regarded as a type of forces that is responsible for alterations in the motion of a particular object.Net force can be regarded as the summation of all forces that is acting in overall on a particular object In a case when a forces in an object are not balanced, then net force is becomes zero
Therefore, Net force give summation of all forces on an object.
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Can someone help me please
Answer:
D
Explanation:
Because it is impossible for it to show the real depth of the ocean and how deep it is
If (x + 8) is a factor of f(x), which of the following must be true?
Both x = -8 and x = 8 are roots of f(x).
Neither x = -8 nor x = 8 is a root of f(x).
f(-8) = 0
Of(8) = 0
?
Answer:
c <3.
Explanation:
trust me :D
Answer:
f(–8) = 0
Explanation:
just took the quiz
Einstein's theory of general relativity is currently the best explanation of
gravity. Why has this theory not been replaced with a new one?
O A. Scientists assume it is correct and therefore no longer perform
experiments on gravity.
O B. Because of Einstein's fame, it remains popular among scientists.
O C. The force of gravity has been shown to remain constant over time,
O D. It still explains the experimental evidence pertaining to gravity.
SUBMIT
Answer:
d
Explanation:
im pretty sure. just makes the best sense. If im wrong im very sorry.
Answer:
D
Explanation:
because its right
Click to review the online content. Then answer the question(s) below, using complete sentences. Scroll down to view additional
questions
Online Content: Site 1
Based on their location in the atmosphere, the layers are able to have their own special characteristics. For example, most weather
occurs in the troposphere. What occurs in each of the other layers? (Site 1)
99 % al 31-
BIUS X2 x?
N
Answer:
Explanation:
In the stratosphere the ozone layer absorbs and scatters the solar ultraviolet radiation. In the mesosphere meteors burn up. In the thermosphere aurora and satellites occur. In the ionosphere overlapping into the mesosphere and thermosphere occur.
Answer:
Thermospheric temperatures increase with altitude due to the absorption of highly energetic solar radiation. Radiation causes the atmosphere particles in this layer to become electrically charged, enabling radio waves to be refracted and thus be received beyond the horizon. This is how solar radiation can affect the thermosphere.
Explanation:
got a 100% on online content edge 2022
An object travels along a straight, horizontal surface with an initial speed of 2 ms. The position of the object as a function of time is given in the table. Which of the following graphs represents the object’s velocity as a function of time?
Answer:
The options are not provided, so i will answer in a general way.
We know that:
The movement is along a straight horizontal surface, then we have one-dimensional motion.
The speed is 2m/s
We want a graph of position vs time.
Now, remember the relation:
Distance = Speed*Time
Then we can write the position as a function of time as:
P(t) = 2m/s*t + P0
Where t is our variable, that represents time in seconds, and P0 is the position at time t = 0seconds, we can assume that this is zero.
Then the equation is:
P(t) = 2m/s*t
And the graph is something like:
The velocity of the object as function of time is given as, v = u + at
The given parameters;
initial velocity of the object, u = 2 m/s
The velocity of an object is defined as the change in the displacement of the object per change in time of the object's motion.
The final velocity of the object at any time, t, is given as;
v = u + at
where;
u is the initial velocity
a is the acceleration of the object
t is the time of motion
Thus, at every time (t), the velocity of the object will be the sum of the initial velocity and the product of the acceleration and time of motion.
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How is friction reduced between an air hockey puck and the table?
Cause it's Corona Time
A 100-m long ski lift carries skiers from a station at the foot of a slope to a second
station 40 m above. What is the IMA of the lift?
40
Answer:
12
Explanation:
Explanation:
The ideal mechanical advantage of a slope is given by the ratio between the output load, which is simply the weight of the object (Fw), and the input force Fi applied to move the object along the slope:
ima= {Fw}÷{Fi},
The energy conservation law states that the potential energy of the object when it reaches the final height h is equal to the work done to move the object along the distance of the slope ll , i.e.
Fw h = Fi L
From this we find
{Fw}÷{Fi} = {L}÷{h}
Therefore, we can substitute this into the formula of the ideal mechanical advantage and calculate its value:
ima= {L}÷{h} = {100m}÷{40m}=2.5
Why do we dream? What causes you to dream?
Answer:
you dream because
Explanation: you sleep
How can you turn off a magnetic field produced by an electrical current?
a By placing a material with strong magnetic properties inside the coil of a solenoid b By making a loop or coil in the wire c By increasing the current in the wire d By turning the electrical current off
Answer:By turning the electrical current off
Explanation:Trust me I took the test
Answer:
d) By turning the electrical current off
Explanation:
this is the only one that fits this situation because all of the other answers help improve the magnetic field.
4. Two scientists are experimenting with pure samples of isotope X, a highly radioactive substance. The first scientist has a sample with a mass of 20 grams. He
measures a half-life of 232 seconds. The second scientist has a sample of the same substance with a mass of 80 grams. What is the half-life that she is most likely
to measure?
A. 58 seconds
B.232 seconds
C.464 seconds
D. 928 seconds
Answer:
D
Explanation:
The substances are the exact same!
The half life should be the same too :)
A half life is how long it takes for a substance to break down and leave your system.
So for 20 grams, it goes away in 232 seconds, but for 80 grams, which is 4 times the amount, you would also multiply the half life by 4
I hope this is correct!
The half-life of the sample of isotope X of 80 grams is the same as that of the sample of 20 grams, that is, 232 seconds (option B).
To find the answer, we need to remember the definition of half-life.
The half-life ([tex]t_{1/2}[/tex]) of a radioactive substance is the time at which the initial amount of a substance (the number of disintegrations, mass, activity) decreases by half after it decays into another substance, due to the emission of radiation in the form of a particle (alpha, beta⁺, beta⁻) or energy (gamma-ray or X-ray).
Since the two scientists are experimenting with the same isotope X, the half-life of the sample is the same, regardless of its initial and final mass, so the half-life of the sample of 80 g is 232 seconds.
Therefore, the answer is option B (232 seconds).
Learn more about half-life here:
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https://brainly.com/question/7612438?referrer=searchResults
I hope it helps you!
A track star runs the first 500 meters of a race in only 75 seconds. What is the track
star's speed
Answer:
6.667 m/s
Explanation:
500 meters = 75 seconds
500 meters / 75 seconds = 6.667 m/s
Looking at the examples below and select the change in matter that is an example of a physical change A Ice Melting B leaves changing color C starting a fire
Answer: Your answer will be A
What are aerial plants
Answer:
Aerial plants are plants that lives in air or wind the wind serves as the water of the plants. Most aerial plants are found in tropical and equatorial regions of the world. In evergreen rain forests, the foliage is so thick that some plants have evolved aerial roots to allow them to absorb more sunlight. The development of aerial roots is
thus an evolutionary process.Aerial roots are often thick and spread around the parent tree. The Banyan tree can have several aerial roots as it gets older.
Explanation:
HOPE IT HELPS MARK AS BRAINLIEST
459 ft/sec --> mi/hr
Answer:
?
Explanation:
what im not understanding do u need help?
If mass A is 1.0 kg, mass B is 5.0 kg, and the frictional pulley has a mass of 0.5 kg and a radius of 0.15 m, what is the velocity of A and B at 0.5 seconds?
a. A = 1.72 m/s, B = 0.22 m/s
c. A = 0.22 m/s, B = 1.72 m/s
b. A = 3.14 m/s, B = -3.14 m/s
d. A = -3.14 m/s, B = 3.14 m/s
Answer:
b. A = 3.14 m/s, B = -3.14 m/s
Explanation:
Assuming this refers to an Atwood machine, draw free body diagrams for each mass.
For mass A, there are two forces: tension T₁ pulling up and weight m₁g pulling down.
For mass B, there are two forces: tension T₂ pulling up and weight m₂g pulling down.
For the pulley, there are two torques: tension T₁r pulling counterclockwise and tension T₂r pulling clockwise.
Sum of forces on A in the +y direction:
∑F = ma
T₁ − m₁g = m₁a
T₁ = m₁g + m₁a
Sum of forces on B in the -y direction:
∑F = ma
m₂g − T₂ = m₂a
T₂ = m₂g − m₂a
Sum of torques on the pulley in the clockwise direction:
∑τ = Iα
T₂r − T₁r = (½ mr²) (a/r)
T₂ − T₁ = ½ ma
Substitute:
m₂g − m₂a − (m₁g + m₁a) = ½ ma
m₂g − m₂a − m₁g − m₁a = ½ ma
m₂g − m₁g = m₂a + m₁a + ½ ma
g (m₂ − m₁) = a (m₂ + m₁ + ½ m)
a = g (m₂ − m₁) / (m₂ + m₁ + ½ m)
a = (9.8 m/s²) (5.0 kg − 1.0 kg) / (5.0 kg + 1.0 kg + ½ (0.5 kg))
a = 6.272 m/s²
Given:
v₀ = 0 m/s
a = 6.272 m/s²
t = 0.5 s
Find: v
v = at + v₀
v = (6.272 m/s²) (0.5 s) + 0 m/s
v = 3.14 m/s
Therefore, mass A will rise at 3.14 m/s, and mass B will fall at 3.14 m/s.
Under normal conditions, what color do we expect diamonds to be?
Why is the sky blue
A. It's lonely and sad
B. Gases and particles in Earth's atmosphere scatter sunlight in all directions
C. Because it absorbs all colors except blue
Answer:
B
Explanation:
Test
A ball is dropped from a height h and falls the last half of its distance in 4 seconds. How long does the ball fall? From what height is the ball originally dropped?
Answer:
How long does the ball fall is t_2 = 13.66 (s).
From what height is the ball originally dropped is h= 913.90 (m).
Explanation:
An atom with 5 protons 6neutrons.and 5 electrons has an atomic mass of_______amu
Answer:
5 + 6 = 11
You just add the protons and the neutrons and you get the atomic mass
What can you use to demonstrate that matter is made up of tiny particles?
~A hypothesis
~A decision
~A prediction
~A model
A model can be used to demonstrate that matter is made up of tiny particles (option D).
What is a model?A model is a simplified representation used to explain the workings of a real world system or event.
An atom is the smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.
This means that an atom is made up of smaller particles called subatomic particles.
However, a model is what can be used to demonstrate that matter is made up of tiny particles.
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what do pitch and loudness have in common?
Answer:
both are subject to a person's interpretation.
Answer:
it is a subject to a person's interpretation.
Explanation:
i hope this helps!
If our solar system's Sun was half the mass as it is now, what would happen to the orbit of the Earth
why discharge does not take place at very low pressure
Answer:
read explanation
Explanation:
Due to this reason a gas (air) a conductor of electricity at low pressure. ... It is because when the gas is at very low pressure positive charged ions are not available to eject out the electron from the cathode hence the discharge current stops.No, vacuum cannot conduct electricity.
What stage of development was from birth to around 2
Answer:
Sensory and Motor development.
Explanation:
