When did our solar system begin to form?
The solar system started forming about 4.6 billion years ago. It is believed that a massive molecular cloud collapsed under its own gravity, which led to the creation of the sun and later, the planets and other celestial bodies.
Explanation:Our solar system began to form about 4.6 billion years ago. This formation process can be broken down into few stages. The first stage is known as the nebular hypothesis, when a massive molecular cloud in the Milky Way collapsed under the weight of its own gravity. This led to the creation of our Sun, the primary focus of our solar system. Following this, the remaining materials around the Sun slowly began to amalgamate, forming planets, moons, and other celestial bodies, marking the formation of our solar system.
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List 3 differences between aerobic and anaerobic exercise
Answer:
Explanation:
1) Level of oxygen consumption is higher in case of aerobic exercise.
2) Aerobic exercise is slow, light and long duration exercise, like jogging but anaerobic exercise is fast and short duration exercise like swimming .
3) Aerobic exercise helps in improving the functioning of heart , muscle etc. Anaerobic exercise helps in burning of body fat.
Consider this situation: A bucket of water, attached to a rope, is being pulled upward out of a well. Of the forces listed, identify which act upon the bucket.
a. Normal Force
b. Gravity Force
c. Applied Force
d. Friction Force
e. Tension Force
f. Air Resistance Force
A bucket of water attached to a rope and is being pulled upwards so the forces that will act on the bucket are Gravity force, tension force, and a little bit of air resistance force will be also acting on the bucket.
What is Tension force?The force communicated through a rope, string, or wire when two opposing forces draw on it is known as tension. The tension force pulls energy equally on the bodies at the ends and is applied along the entire length of the wire.
Every physical object in contact with another one applies some force to that object. Based on the type of objects, names are given to these contact forces. You can refer to tension as one of the forces acting on an object, such as a rope, cable, or chain.
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Several forces act on the bucket, including gravity, applied force, tension force, friction force and air resistance. The correct options are b, c, d, e and f.
When pulling a bucket of water upward out of a well, several forces act upon the bucket. These forces are:
Gravity Force: This force acts downward, pulling the bucket towards the Earth.Applied Force: The force exerted by the person pulling the rope upwards.Tension Force: This is the force within the rope, pulling the bucket upward.Friction Force: If there is any contact between the bucket and the walls of the well, friction may occur, opposing the motion.Air Resistance Force: As the bucket moves upward, it may encounter some resistance from the air.In this scenario, the Gravity Force and Tension Force are the most critical in determining the bucket's motion. The normal force does not apply here as it is usually present in scenarios involving surfaces that support objects.
Keeping the Bucket from Falling
1. To keep the bucket from falling back into the well, the force applied (or tension in the rope) must be equal to the gravitational force acting on the bucket.
Work Done by the Rope
2. If the bucket is slowly raised a distance d, the work done on the bucket by the rope is given by the formula:
Work = Force x Distance,
where the force is the tension in the rope acting in the direction of motion.
The tire is inflated (while cold) to a volume of 11.8 l and a gauge pressure of 36.0 psi (note: the gauge pressure is the difference between the total pressure and atmospheric pressure. in this case, assume that atmospheric pressure is 14.7 psi.) at a temperature of 12.0 ∘c. while driving on a hot day, the tire warms to 65.0 ∘c and its volume expands to 12.2 l. what is the pressure in the tire after warming on a hot day?
The Gauge pressure in the tire after warming on a hot day is 43.5 atm.
What is Gauge pressure?Gauge pressure is the pressure measured relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure.
According to the question,
Gauge pressure = total pressure - atmospheric pressure
Total pressure = gauge pressure + atmospheric pressure
Total pressure initially when volume [tex]V_{1}[/tex] = 11.8
Total prssure = 36.0 atm + 14.7 atm
[tex]P_{1}[/tex] = 50.7 atm.
Temperature = 12 + 273
[tex]T_{1}[/tex] = 285 K
Using gas law to determine the total Pressure in volume, [tex]V_{2}[/tex] = 12.2 liters. Temperature = 273 + 65
[tex]T_{2}[/tex] = 338 K
[tex]\frac{ P_1V_1}{ T_1} = \frac {P_2V_2}{ T_2}[/tex]
50.7 atm(11.8 liters)/ 285 K = P2(12.2 liters)/338 K
[tex]P_{2}[/tex] = 50.7(11.8) (338) / 285(12.2)
= 58.2 atm
Total pressure = 58.2 atm
Gauge pressure = 58.2 atm - 14.7 atm = 43.5 atm
The pressure in the tire after warming on a hot day is 43.5 atm.
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A 0.023 kg golf ball moving at 18.9 m/s crashes through the window of a house in 5.4 × 10−4 s. After the crash, the ball contin- ues in the same direction with a speed of 10.1 m/s.
Assuming the force exerted on the ball by the window was constant, what was the mag- nitude of this force?
Answer in units of N.
Microwave ovens use microwave radiation to heat food. the microwaves are absorbed by the water molecules in the food, which is transferred to other components of the food. as the water becomes hotter, so does the food. part a suppose that the microwave radiation has a wavelength of 11.2 cm . how many photons are required to heat 225 ml of coffee from 25.0 ∘c to 62.0 ∘c? assume that the coffee has the same density, 0.997 g/ml , and specific heat capacity, 4.184 j/(g⋅k) , as water over this temperature range.
Answer:
[tex]n = 1.96 \times 10^{28}[/tex] photons
Explanation:
Mass of the coffee is given as
[tex]mass = density\times volume[/tex]
here we know that
density = 0.997 g/ml
volume = 225 ml
now mass of coffee will be
[tex]m = 0.997 \times 225 = 224.325 g[/tex]
now heat required to raise the temperature of coffee will be
[tex]Q = ms\Delta T[/tex]
[tex]Q = 224.325 \times 4.184 \times (62 - 25)[/tex]
[tex]Q = 34727.3 J[/tex]
now we know that energy of one photon is
[tex]E = \frac{hc}{\lambda}[/tex]
[tex]E = \frac{(6.6 \times 10^{-34}) ( 3 \times 10^8)}{0.112}[/tex]
[tex]E = 1.77 \times 10^{-24} J[/tex]
now it requires "n" photons to complete the energy
[tex]n\times (1.77 \times 10^{-24}) = 34727.3[/tex]
[tex]n = 1.96 \times 10^{28}[/tex]
The number of photons that are required to heat 225 ml of coffee from 25.0 °C to 62 °c
n = 1.962 × 10^(28) photons
We are given;
Wavelength; λ = 11.2 cm = 0.112 m
density; ρ = 0.997 g/ml
volume; V = 225 ml
Specific heat capacity; c = 4.184 J/g.k
Change in temperature;
Δt = (273 + 62) - (273 + 25) K = 37 K
Formula for mass given density and volume is;
m = Vρ
Thus; mass of coffee;
m = 225 × 0.997
m = 224.325 g
Now, formula for Quantity of heat required to raise the temperature is;
Q = mcΔt
Thus;
Q = 224.325 × 4.184 × 37
Q = 34,727.3046 J
Now, we know that formula for energy of photon is; E = hc/λ
Where;
h is Planck's constant = 6.6 × 10^(-34) J.s
c is speed of light = 3 × 10^(8) m/s
λ is wavelength.
Thus;
E = [6.6 × 10^(-34) × 3 × 10^(8)]/0.112
E = 1.77 × 10^(-24) J
To get the number of photons required, we will use the formula;
n = Q/E
Thus;
n = 34,727.3046/(1.77 × 10^(-24))
n = 1.962 × 10^(28) photons
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Consider the circled elements in the periodic table. Based on their location, we could infer that most of them are
A)
very reactive gases.
B)
gases at room temperature.
C)
do not react readily with metals.
D)
nonreactive solids at room temperature.
Consider the circled elements in the periodic table. Based on their location, we could infer that most of them are
A)
very reactive gases.
B)
gases at room temperature.
C)
do not react readily with metals.
D)
nonreactive solids at room temperature.
The clear answer to this question is B. I know because I had this question and I got it right.
Consider the circled elements in the periodic table. Based on their location, we could infer that most of them are gases at room temperature. Therefore, option B is correct.
What is periodic table ?The chemical elements are arranged in rows and columns in the periodic table, sometimes referred to as the periodic table of the elements. It is frequently used in physics, chemistry, and other sciences and is frequently regarded as a symbol of chemistry.
The atomic symbol, atomic number, and mass number of an element are its crucial properties in the periodic table. Russian chemist Dmitri Mendeleev deserves praise for developing the design for the current periodic table.
Each element's location in the table provides crucial details regarding its composition, characteristics, and behavior during chemical reactions. In particular, you may determine an element's electron configuration that is, how the electrons are arranged around the nucleus by looking at where it is in the periodic table.
Thus, option B is correct.
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Which is an example of translational motion?
Question 2 options:
The dog ran from the tree to the swing set.
A child plays on a merry-go-round.
A girl eats a sandwich.
Molecules in a block of wood vibrate.
Moving a distal part of arms or legs to follow a circular path is:
The number of electromagnetic waves that travel past a certain point in a given time is the ________ of the radiation.
The number of electromagnetic waves that pass a certain point in a given time is the frequency of the radiation. Electromagnetic waves are characterized by their wavelength, frequency, and amplitude. Frequency is the number of complete wave cycles that pass a specific point in a set time, measured in Hertz.
Explanation:The number of electromagnetic waves that travel past a certain point in a given time is the frequency of the radiation. To describe it in more detail, electromagnetic waves are depicted by their wavelength, frequency, and amplitude. For instance, when looking at a wave, the wavelength is the distance between two consecutive peaks or troughs.
Conversely, the frequency is the number of these complete wave cycles that pass a specific point in a designated period. It can be expressed in cycles per second, or Hertz (Hz). And lastly, the amplitude refers to the magnitude of the wave's displacement, i.e., half the height between the wave's peaks and troughs which is associated with the light's intensity or brightness for sound it refers to loudness.
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_____ is a hormone , but is not related to stress
Answer:
Estrogen
Explanation:
Estrogen is the hormone which is very useful in the sexual and reproduction development in the women.
This hormones also known as females sex hormones. The term estrogen refers to all the chemically related hormones in this group, which are estradiol, estrone and estriol.
It is related with the secondary development characteristics means it is related with the female reproductive system and the development of breast.
Therefore, it is a hormone which is related to the sexual and reproduction development but not related with any kind of stress.
which constellation contains some of the brightest stars in the northern hemisphere
At a given instant in time, a 6-kg rock that has been dropped from a high cliff experiences a force of air resistance of 15 n. what are the magnitude and direction of the acceleration of the rock? (do not forget the gravitational force!) round the final answer to two decimal places.
The magnitude of the acceleration of the rock is 7.3 m/s² downward.
Explanation:The rock experiences two forces at this given instant: the force of gravity and the force of air resistance. The force of gravity is equal to the weight of the rock, which is given by the equation Fg = mg, where m is the mass of the rock (6 kg) and g is the acceleration due to gravity (9.8 m/s²). Therefore, Fg = 6 kg × 9.8 m/s² = 58.8 N. The force of air resistance is given as 15 N.
To find the net force acting on the rock, we subtract the force of air resistance from the force of gravity: Fnet = Fg - Fair = 58.8 N - 15 N = 43.8 N.
The magnitude of the acceleration of the rock can be found using Newton's second law, which states that the net force on an object is equal to the mass of the object multiplied by its acceleration. Therefore, a = Fnet / m = 43.8 N / 6 kg = 7.3 m/s².
The direction of the acceleration is downward, which is the same as the direction of the force of gravity.
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If the moon were 2 times closer to earth than it is now, the gravitational force between earth and the moon would be
Final answer:
According to Newton's Law of Universal Gravitation, if the moon were 2 times closer to Earth, the gravitational force would be 4 times greater than at its current distance.
Explanation:
If the moon were 2 times closer to earth than it is now, the gravitational force between Earth and the Moon can be determined using Newton's Law of Universal Gravitation, which states that the gravitational force (F) between two masses is directly proportional to the product of their masses ([tex]m_1[/tex] and [tex]m_2[/tex]) and inversely proportional to the square of the distance (r) between their centers.
The equation for gravitational force is [tex]F = G * (m_{1} * m_{2}) / r^2[/tex], where G is the gravitational constant. According to this law, if the distance between two objects is reduced by half, the gravitational force between them would increase by a factor of 22, or 4 times, because the force varies inversely with the square of the distance. Therefore, if the Moon were 2 times closer to Earth, the gravitational force would be 4 times greater than it is at its current distance.
What physical quantity is a measure of the amount of inertia an object has?
PLEASE HELP !!!
Two laws are described below:
Law A: It can vary in different countries.
Law B: It pertains to cause and effect relationships in nature.
Based on these characteristics, what can you conclude about Law A and Law B?
Both Law A and Law B are societal laws.
Both Law A and Law B are scientific laws.
Law A is a scientific law and Law B is a societal law.
Law A is a societal law and Law B is a scientific law.
law A is a scientific law and Law B is a societal law.
i just did this test
Calculate the heat energy needed to change the temperature of 2 kg of copper from 10°C to 110°C.
To find the heat energy required to raise the temperature of 2 kg of copper from 10°C to 110°C, we use the specific heat capacity of copper and the formula Q = mcΔT, resulting in 77000 Joules of energy needed.
To calculate the heat energy needed to change the temperature of 2 kg of copper from 10°C to 110°C, we use the formula Q = mcΔT, where Q is the heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.
The specific heat capacity (c) of copper is 0.385 kJ/kg°C (or 385 J/kg°C), and the mass (m) given is 2 kg. The temperature change (ΔT) is 110°C - 10°C = 100°C.
Replacing the values in the formula:
Q = (2 kg) x (385 J/kg°C) x (100°C)
Q = 77000 J
Therefore, the heat energy required is 77000 Joules (or 77 kJ).
Which of the following statements is not correct in regard to forming perceptions? A) The level of familiarity that one has can influence how quickly one recognizes stimuli.
B)Only one’s negative experiences can lead an individual to create stereotypes.
C) One’s motivation can cause two people to perceive the same thing differently. D) One’s expectations cause individuals to overlook various stimuli in the environment.
Answer: The correct answer is B) Only one’s negative experiences can lead an individual to create stereotypes.
Perception is defined as the sequence of steps that are initiated with the reception of stimulus from the environment and ends with the interpretation. In other words, it is the interpretation for the sensory information. It is related to stimuli from the environment and the response produced for it by the individual.
One's negative experience can lead an individual to create stereotypes is not in regard of forming perception. Stereotype corresponds to a set of ideas that a person possesses ( like about a group of people) about something, usually in a negative direction. Whereas, a perception can be created in a positive as well as negative way.
Thus, option B) is the right answer.
to move a heavy object, like a refrigerator which one of the following would not help to decrease the friction force?
Answer:
Use more force to push the refrigerator with the help of a friend
Explanation:
What is one difference between water and ice?
A softball is fouled off with a vertical velocity of 20 m/s and a horizontal velocity of 15 m/s. what is the resultant velocity of the ball
The resultant velocity of the softball fouled off with vertical and horizontal components of 20 m/s and 15 m/s, respectively, is 25 m/s, calculated using the Pythagorean theorem.
To calculate the resultant velocity of a softball that is fouled off with a vertical velocity of 20 m/s and a horizontal velocity of 15 m/s, we can use the Pythagorean theorem. The resultant velocity (Vr) is the vector sum of the vertical (Vy) and horizontal (Vx) components of velocity.
The formula for the resultant velocity is given by:
[tex]Vr = \/(Vx^2 + Vy^2)[/tex]
Plugging in the values we have:
[tex]Vr =\/(15 m/s)^2 + (20 m/s)^2Vr = \/(225 + 400) m/sVr = \/625 m/sVr = 25 m/s[/tex]
Therefore, the resultant velocity of the softball is 25 m/s.
The launching velocity of a missile is 20.0 m/s, and it is shot at 53° above the horizontal. What is the vertical component of the velocity at launch?
Argon, neon, and xenon are examples of
A. Halogens
B.metalloids
C. noble gases
D. alikia metals
Answer:B
Explanation:
Microwaves are electromagnetic signals that can be aimed in a single direction and have more carrying capacity than radio waves.
a. True
b. False
What type of motion is occurring when the slope of a velocity vs. time graph is zero?
Answer:
Explanation:
The type of motion when the velocity is not zero could vary. It could be increasing or decreasing depending upon the direction is going away from or towards a specific point (x) if object is speeding up or slowing down
If a vector that is 3 cm long represents 30 km/h, what velocity does a 5 cm long vector which is drawn using the same scale represent?
Two magnetic poles that repel one another are held three inches apart. What happens when the poles are moved closer together, to a distance of one inch apart?
Answer: The force of repulsion increases.
Explanation:
The same poles repel each other and the opposite poles attract each other.
Force of repulsion: The force by which the bodies repel each other.
In the same poles case, there is a force of repulsion. In the opposite poles case, there is a force of attraction.
In the given problem, two magnetic poles that repel one another are held three inches apart.
The magnetic force follows inverse square law with distance. The force of repulsion is inversely proportional to the square to the distance between the same poles of the two magnets.
When the poles are moved closer together, to a distance of one inch apart then the force of repulsion increases.
As water runs over a waterfall, its potential energy is converted to _______________ energy.
a cliff diver drops from rest to the water below. how many seconds does it take for the diver to go from 0 to 60. that is to go from 0mph to 60mph
Final answer:
The time it takes for a cliff diver to accelerate from 0 mph to 60 mph under gravity is approximately 2.73 seconds, using the formula for acceleration with conversion from mph to m/s.
Explanation:
The question involves calculating the time it takes for a cliff diver to accelerate from 0 mph to 60 mph solely under the influence of gravity, assuming negligible air drag. To tackle this problem, we first convert 60 mph to meters per second (m/s) for consistency with the standard unit of acceleration due to gravity (9.81 m/s2). 60 mph is approximately 26.82 m/s. Using the formula v = u + at, where v is the final velocity (26.82 m/s), u is the initial velocity (0 m/s), a is the acceleration due to gravity (9.81 m/s2), and t is the time in seconds, we can solve for t. Plugging the values into the equation, we get 26.82 = 0 + 9.81t. Solving for t, we find t ≈ 2.73 seconds.
Physical changes produce new substances. Please select the best answer from the choices provided T F
Answer: False
Explanation: Physical change is a change in which there is no rearrangement of atoms and hence there is no production of new substances.
[tex]H_2O(l)\righatleftharpoons H_2O(g)[/tex]
This is a physical change in which water only changes its state from liquid to gas.
Chemical change is a change in which there is rearrangement of atoms and hence there is production of new substances.
[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]
This is a chemical change in which sodium combines with chlorine to form new substance sodium chloride.