Answer:
Write two important of physical state
Which of these is an example of projectile motion?
a
a jet lifting off a runway
b
a roller coaster going down a steep track
c
a piece of fruit falling off a tree
d
a baseball that has just been thrown
Answer:
the answer is d I'm pretty sure
Calculations, show formula, substitution, and answer with units for full credit:
1. A train travels 150 kilometers in 5 hours. How fast is it traveling?
Answer:
30 km/h
Explanation:
V=S:t
speed=length:time
150:5=30
1. One light goes out, they all go out
correct answer:✅series
Voltage and current are directly related
wrong answers: no circuits and parallel
hint:More voltage from the battery pushes more current through.
resistance and current are directly related
wrong answers: all circuits and parallel
hint: If you have more resistance in a circuit, does the current go up? That's what would happen if they were directly related.
Voltage and resistance are unrelated
correct answer:✅all circuits
answer choices are series, parallel, all circuits, and no circuits
2.Which will make the electromagnet weaker?
correct answer:Unwrapping some of the coils.
3.Why do gases exert more pressure or increase their volume when the temperature is raised?
correct answer:At higher temperatures, the particles of a gas move faster. This increase in kinetic energy can increase the pressure and / or the volume of the gas.
hint: A few reminders of definitions from last semester:
Kinetic energy is the energy of motion.
Temperature is the average kinetic energy of the particles in a sample.
For a gas:
Temperature and pressure are directly related.
Temperature and volume are directly related.
Pressure and volume are inversely related.
4.Which group naturally achieves the octet rule without gaining or losing electrons?
correct answer:Noble gases
5.Label each as a physical or chemical property/change.
Shiny -✅physical
electrolyte -✅physical
highly reactive -✅chemical
In the presence of oxygen, will form carbon dioxide and water -✅chemical
maellable -✅physical
rusts -✅chemical
acid rain erodes statues and monuments -✅chemical
6.Which statement is true about the groups on the periodic table?
correct answer:The halogens have 7 valence electrons and form -1 ions.
7. Match the word to its definition.
the stuff that gets dissolved in a solution -✅solute
the stuff that does the dissolving in a solution -✅solvent
this determines the amplitude of a wave - ✅energy
the change in frequency of a wave as the object that is producing it moves towards or away from you -✅Doppler Effect
The material that a wave moves through-✅medium
Wave whose matter vibrates perpendicular to the direction the wave travels -✅ transverse
An atom of an element that has a specific number or neutrons, such as Carbon-14. -✅isotope
8.Check all true statements about the dog as it runs the obstacle course.
✅If the dog has the highest average speed, he will win the race.
✅A heavier dog will have a harder time changing direction on the course because it has more inertia than the small dog.
✅As the dog turns, his velocity changes as he changes direction.
( I got a 2.4 out of 4 on this questions, the other options were)
Whenever the dog speeds up, slows down, or changes direction, he is accelerating.
The dog's speed is constant throughout the race.
The weight of the dog will be the same if the competition was held on the moon.
If the doe can double his net force on an obstacle, his acceleration will be cut in half.
The mass of the dog will be the same if you take him to the international space station.
the wrong answer was❌The dog's velocity is constant throughout the race. because the speed and direction changed throughout, the velocity is not constant.
9.Match each atom with the correct element it represents. Make sure you are using your periodic table (Links to an external site.)
✅ Beryllium
✅ Lithium
✅ Helium
✅ Carbon
(image below is for question 9)
Explanation:
ndndndndnndndndndndndndnndndnd
Answer:
teysyshnk
Explanation:
You want to calculate how long it takes a ball to fall to the ground from a
height of 20 m. Which equation can you use to calculate the time? (Assume
no air resistance.)
O A. vz? = v? +2aAd
B. a =
V₂-vi
At
O c. At=V1
4
a
O D. At=
2Ad
a
If a person wants to calculate the length of time it takes for a ball to fall from a height of 20m, the correct equation that they should use is:
D. Δt= √2Δd/a
What is the equation for finding the length of time for a free fall?The free fall formula should be used to obtain the length of time that it takes for a ball to fall from a given height. This formula also factors the height or distance from which the fall occurred and this is denoted by the letter d. The small letter 'a' is denotative of acceleration due to gravity and this is a constant pegged at -9.98 m/s².
So, the change in height is obtained and multiplied by two. This is further divided by the acceleration and the square root of the derived answer translates to the time taken for the ball to fall from the height of 20m. Of all the options listed, option D represents the correct equation.
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Imagine you are an alien from a distant galaxy. Your home planet does not have any gravity. You have just landed on Earth and make a few observations about the planet.
What are some ways you might first observe gravity?
How might you test gravitational force?
How would you describe gravity to other aliens back at your home planet?
Use details to support your answer.
The first thing an alien would notice about gravity on earth is how it affects their movement. If their planet is closer to the sun in their solar system, they'd be accustomed to a higher pull of gravity, hence weight. Based on the above, an alien will feel lighter on earth without auto-assistive gravity adjuster technology.
The simplest way to test gravity is by comparing my weight using "homemade" scales on the ship, then checking that against my weight off the ship.
The simplest way to describe Earth's gravity to those the home planet is to use scientific language. The acceleration of gravity at the Earth's surface is approximately 9.8 meters (32 feet) per second every second. This is constant.
What is Gravity?Gravity, often known as gravitation, is a force that exists between all physical things in the universe. The force of gravity seeks to draw any two objects or particles with nonzero mass toward one other. Gravity affects things of all sizes, from subatomic particles to galaxy clusters.
Einstein proposed that the geometry of spacetime is what causes the force we call gravity. A mass (or energy) concentration, such as the Earth or sun, bends space around it in the same way as a boulder bends the flow of a river. As a result, gravity was created.
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how much energy is possessed by 1 mole of nitrogen atoms moving at 35.0 m/s ?
1 mole of nitrogen atoms moving at 35.0 m/s possesses approximately 27.8 joules of energy.
To calculate the energy possessed by 1 mole of nitrogen atoms moving at 35.0 m/s, we need to consider both the kinetic energy and the molecular mass of nitrogen.
The kinetic energy (KE) of an object is given by the equation KE = 1/2 * m * v^2, where m is the mass and v is the velocity.
The molar mass of nitrogen (N₂) is approximately 28.0134 g/mol, which can be converted to kilograms by dividing by Avogadro's number (6.022 × 10^23). This gives us a mass of approximately 4.65 × 10^(-26) kg for one nitrogen atom.
Plugging in the values, we have KE = 1/2 * (4.65 × 10^(-26) kg) * (35.0 m/s)^2.
Evaluating the equation, we find that the kinetic energy possessed by one nitrogen atom is approximately 4.62 × 10^(-23) joules.
Since we are considering 1 mole of nitrogen atoms, we need to multiply this value by Avogadro's number to get the energy possessed by 1 mole. Avogadro's number is 6.022 × 10^23, so the total energy is approximately 2.78 × 10^1 joules, or 27.8 J.
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Substance absorbed 25% of light. What are the values of transmittance and absorbance?
The substance absorbed 25% of light. The values of absorbance is 25%. The values of transmittance is 0.6.
What is absorbance and transmittance?When some amount of light fell on a substance the whole amount does not reflect. The amount of light is absorbed by the substance. That term called the absorbance. And the other term Transmittance refers that the ratio of amount of light placed on the substance and the amount of reflected light.
How can we calculate the values of absorbance and transmittance?To calculate the values of absorbance and transmittance, there are many ways of calculate that like,
Calculation Method, Nomogram Method, Experimental Method.But we are using Nomogram Method, by using this method, we get a analysis, then we can say that, according to the question substance absorbed 25% of light. So the absorbance of the substance is 25%. According to the chart we can say that the transmittance of the substance is 0.6.
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A race car goes forward from 0 to a velocity of 80 m/s in 9.4 s. What is its acceleration?
Answer:
The average acceleration is about 8.51 m/s
Explanation:
We can use the formula for acceleration to solve.
a = \(\frac{velocity_{final} -velocity_{start} }{time}\)
a = \(\frac{80-0}{9.4}\)
a = \(\frac{80}{9.4}\)
a ≈ 8.51
Two buckeys of nails are hung one above the other and are pulled up to a roof by a rope. Each buckey has a mass of 5.0 kg. The tension in the rope connecting the buckets is 60 N. Calculate the applied force needed to lift both buckets up.
The applied force needed to lift both buckets up is 71 N.
Net force on the bucketsThe net force applied on the buckets is calculated as follows;
F(net) = F(T) + (-Fg)
where;
F(net) is the net forceF(T) is the tension in the ropeFg is the force of gravitySubstitute the given parameters and solve for the net force on the bucket.
F(net) = 60 N - (5 x 9.8)
F(net) = 60 N - 49 N
F(net) = 11 N
Applied force needed to lift the bucketThe force needed to lift the bucket = F(net) + F(T)
F(app) = 11 N + 60 N
F(app) = 71 N
Thus, the applied force needed to lift both buckets up is 71 N.
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Please help! I'm really desperate.
Could anyone at least give some sketch ideas or advice?
I'm not sure how to set it out..
Answer:
make a pineapple schematic
Explanation:
____help the body change food into energy and repair and replace old and damaged parts.
Answer: Vitamins
Explanation:
Three bulbs_ two of which contain different gases and one of which is empty; are connected as shown in drawing (a). Which drawing (b) - (d) best represents the system after the stopcocks are opened and the system is allowed to come to equilibrium? drawing (d) drawing (b) drawing (c}
Drawing (d) best represents the system after the stopcocks are opened and the system is allowed to come to equilibrium, as it shows equal pressure in all three bulbs.
Since the two bulbs contain different gases, the pressures in each bulb will be different. When the stopcocks are opened, the gases will flow into the empty bulb until the pressures are equalized. The final state will have equal pressure in all three bulbs.
What is an equilibrium?
An equilibrium is a state of balance or stability achieved in a chemical reaction when the forward reaction rate is equal to the reverse reaction rate. In other words, it is the point at which the concentrations of reactants and products no longer change with time, because the rates of the forward and reverse reactions are equal.
At equilibrium, the amounts of reactants and products are governed by the equilibrium constant (K), which is a measure of the relative concentrations of the reactants and products at equilibrium.
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L Pretest Unit 7
Question 13 of 20
Andrew is trying to identify an unknown element. The element is shiny, but it
shatters when hammered and cannot be hammered into different shapes.
Where on the periodic table is this element most likely found?
A. On the left side
B. In one of the series below the main body of the table
C. On the right side
D. Along the metalloid stairstep line
SURMIT
Answer:
C
Explanation:
I think it would be there, it sounds like silicone and thats on the right side
Along with force, which other variable is used to calculate impulse?(1 point)
A The mass of an object.
B The amount of time the object is in motion.
C The amount of time the force is applied.
D The speed of the object.
Answer: The amount of time the force is applied.
Explanation:
The other variable along with the force which is used to calculate the impulse is the amount of time the object is in motion. Hence, option B is correct.
What is impulse?A force's overall impact as it operates across time is quantified by the term "impulse." It is often written in Newton seconds and given the symbol, J end text, and value.
This is similar to a shift in momentum, as we previously saw (p). The impulse-momentum theorem refers to this correspondence. We can directly connect the way a force applies to an object over time and the way that force affects the motion of an object according to the impulse-momentum theorem.
Because forces are frequently not constant in reality, impulse is necessary and beneficial. People- and engine-related forces start out at zero and gradually increase over time, however they can vary depending on a variety of circumstances.
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Would you rather know how you die or know when you die?
Answer:
I guess how cause then I could posibbly prevent it from happening it or if say I die from a protest and I saw a protest I could just be like well im gonna die today. Hbu?
Explanation:
How would increasing the magnitude of the charges on two particles and decreasing the distance the between the particles affect the strength of the electric force the strength of the electric force between particles?
The strength of the electric force between particles depends on two factors: the magnitude of the charges on the particles and the distance between them. Increasing the magnitude of the charges and decreasing the distance between the particles will have a significant impact on the strength of the electric force.
Firstly, increasing the magnitude of the charges on the particles will result in a stronger electric force. According to Coulomb's law, the electric force between two charged particles is directly proportional to the product of their charges. So, if the charges on both particles are increased, the force between them will increase proportionally. This is because larger charges generate a stronger electric field, leading to a greater force of attraction or repulsion between the particles.
Secondly, decreasing the distance between the particles will also strengthen the electric force. Coulomb's law states that the electric force is inversely proportional to the square of the distance between the charges. As the distance between the particles decreases, the force between them increases exponentially. This is because the electric field becomes more concentrated, resulting in a higher force of attraction or repulsion between the charges.
In summary, increasing the magnitude of the charges on particles and decreasing the distance between them will both contribute to a stronger electric force. These factors have a multiplicative effect on the force, as the force is directly proportional to the product of the charges and inversely proportional to the square of the distance. By manipulating these variables, the strength of the electric force can be significantly altered, impacting the interactions between charged particles.
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A wave has a frequency of 270 Hz and a wavelength of 6.0 m. What is the speed of the wave? Use the equation v = fx2.
The wave speed of the wave was calculated from the frequency and the wave length is 1600 m/s. Hence, option D is correct.
The speed of the wave is obtained by the product of frequency and the wavelength of the wave. It is measured in m/s.
From the given,
frequency of the wave (f) = 270 Hz
Wavelength (λ) = 6m
Wave speed = f×λ
= 270×6
= 1620 m/s
Thus, the wave speed of the wave is 1620 m/s. Hence, the ideal solution is option D.
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If the atomic mass of Sodium-18 is 18.02597 u, what is the binding energy?
Answer:
The binding energy of sodium Na=5.407791×10⁹JExplanation:
Greetings !Binding energy, amount of energy required to separate a particle from a system of particles or to disperse all the particles of the system. Binding energy is especially applicable to subatomic particles in atomic nuclei, to electrons bound to nuclei in atoms, and to atoms and ions bound together in crystals.
Formula : Eb=(Δm)c²where:Eb= binding energy .Δm= mass defect(kg) c= speed of light 3.00×10⁸ms¯¹Given valuesm= 18.02597c=3.00×10⁸ms¯¹required valueEb=?Solution:Eb=(Δm)c²Eb=(18.02597)*(3.00*10⁸ms¯¹Eb=5.407791*10⁹JAfter you jump into a pool of cold water, you experience the water temperature as being very uncomfortable. However, the experience becomes more bearable the longer you stay in the pool. This is an example of:
Sensory adaptation is the phenomenon where the brain adjusts to a constant or repetitive stimulus over time, causing a decrease in sensitivity.
In this case, the initial shock of the cold water is perceived as uncomfortable, but as the body adjusts to the temperature, the sensation becomes more tolerable. Sensory adaptation is a common occurrence in many aspects of daily life, such as adjusting to bright lights or loud noises. This process allows the brain to focus on new or changing stimuli, rather than being overwhelmed by constant input.
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what heat transfer occurs when warm air rises
Which of the following is NOT a reason why humans sleep?
Sleep helps to restore and repair brain tissue.
Sleep restores and rebuilds memories.
Sleep provides a psychic safety valve to discharge unacceptable feelings.
During sleep, growth hormone is released, especially in children.
Answer and Explanation:
The answer is the second answer choice. This is because we humans can rebuild or build memories during the day, it doesn't have to happen via sleep.
The first answer choice IS a reason because you aren't working your brain as hard, so your brain has time to heal. A mouse study suggests that sleep helps restore the brain by flushing out toxins that build up during waking hours.
The third answer choice IS a reason because of the idea of Wish Fulfillment: Sigmund Freud suggested that dreams provide a psychic safety valve to discharge unacceptable feelings. The dream's manifest (apparent) content may also have symbolic meanings (latent content) that signify our unacceptable feelings.
The forth answer choice IS a reason because of the idea of Cognitive Development: Some researchers argue that we dream as a part of brain maturation and cognitive development.
#teamtrees #PAW (Plant And Water)
A rocket ship carrying passengers blasts off to go from New York to Hong Kong, a distance of about 13,000 km. (a) How fast (in terms of c) must the rocket ship go to have its own length shortened by 1%? c (b) Ignore effects of general relativity and determine how much time (in s) the rocket ship's clock and the ground-based clocks differ when the rocket ship arrives in Hong Kong.
Answer:
0.14c
0.003 s
Explanation:
See attachment
In order to define speed direction is not important true or false
A 0.75 kg mass attached to a vertical spring stretches 0.30m. a) what is the spring constant?
Answer:25N/
Explanation:
WHEN AN OBJECT IS DROPPED WHAT HAPPENDS TO THE POTENTIAL AND KENETIC ENERGY AS IT FALLS?
Answer:
The sum of an object's potential and kinetic energies is called the object's mechanical energy. As an object falls its potential energy decreases, while its kinetic energy increases. The decrease in potential energy is exactly equal to the increase in kinetic energy.
Explanation:
Answer:
the potential decrease and kinetic increase
Explanation:
because it goes from a state of rest to a state of movement
10. What is the resistance of a lamp that is connected to a 110 voltage source that draws 2 amps of
current?
Answer:
According to ohms law
V= I x R
R= V ÷ I
R= 110 ÷ 2
R= 55 ohms
Explanation:
PLEASE ANSWER FASG I WILL MARK BRAINELIST PLEASEEEEE
The number of protons in the nucleus of an atom determines the species of the atom, i.e., the element to which the atom belongs. An atom has the same number of protons and neutrons. But the electron number cannot be used instead because (5 points)
a. electrons are not within the nucleus
b. electrons are negatively charged
c. electrons can be removed from or added to an atom
d. electrons are lighter than protons
The electron number cannot be used instead because electrons can be removed from or added to an atom (option C)
Why the electron number cannot be used instead?The element of an atom is determined by its proton count, while the electron count can exhibit variability. Take, for instance, a sodium atom, which encompasses 11 protons and 11 electrons. However, it has the capacity to relinquish one electron, transforming into a sodium ion housing only 10 electrons.
This occurs due to the relatively loose binding of electrons to the nucleus, enabling their removal through the influence of an electric field or alternative mechanisms.
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Can you list the offensive position on a flag football team?
Answer:
yes u can flag football has everything that pad football has so you can enlist on being offensive position but you have to play like you want that position
Explanation:
A 1200 kg car moving +13.7 m/s makes
an elastic collision with a 3200 kg truck,
initially at rest. What is the velocity of the
car after the collision?
(Unit = m/s)
Remember: right is +, left is -
When a car collides with another object, the total momentum of the system before and after the collision must be conserved. Momentum, on the other hand, is a product of mass and velocity. To find the velocity of a car after a collision, we must first consider the initial momentum of the system before the collision and compare it to the final momentum after the collision.
The total momentum of the system before the collision is calculated as follows:P_initial = m_car x v_carP_initial = 1200 kg x 13.7 m/sP_initial = 16,440 kg*m/s Since the two cars stick together after the collision, their final velocity is the same. Let's suppose the final velocity of the cars after the collision is v_f. Then:P_final = (m_car + m_obstacle) x v_fwhere m_obstacle is the mass of the object the car collided with. Because the car is at rest after the collision, we can assume that the velocity of the object it collided with is zero. Therefore:P_final = m_car x v_fP_final = 1200 kg x v_fThe momentum of the system after the collision must be equal to the momentum of the system before the collision. That means:P_initial = P_final16,440 kg*m/s = 1200 kg x v_fv_f = 13.7 m/s - (16,440 kg*m/s / 1200 kg) v_f = 13.7 m/s - 13.7 m/s v_f = 0 m/sTherefore, the car will come to a stop after the collision.For such more question on velocity
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The following statements are related to the force of a magnetic field on a current-carrying wire. Indicate whether each statement is true or false.
1) The magnetic force on the wire is independent of the direction of the current.
A) True
B) False
2) The force on the wire is directed perpendicular to both the wire and the magnetic field.
A) True
B) False
3) The force takes its largest value when the magnetic field is parallel to the wire.
A) True
B) False
Answer:
1) B: False
2) A: True
3) B: False
Explanation:
1) Statement is false because the force is not independent of the current but rather depends on the direction of the field and current.
2) Statement is true as per right hand thumb rule.
3) The statement is false because force takes its largest value when the magnetic field direction and electric current direction are perpendicular to each other.