Explanation:
Given parameters:
Mass of the weight = 15kg
Height of bar lift = 0.25m
Number of times lifted = 15times
Unknown:
Total height the bar was lifted = ?
Force needed for the lift = ?
Work done = ?
Solution:
To solve this problem we need to understand that;
Work done = Force x distance
Work done = mass x acceleration due gravity x height
Work done = weight x height
a. Total height:
Total height = 0.25 x 15 = 3.75m
b. Force needed ;
Force needed = Weight of bar = mass x gravity
= 15 x 9.8 = 147N
So;
Force used for the 15 times = 15 x 147 = 2205N
c. Work done ;
Work done = weight x height = 2205 x 3.75 = 8268.75J
Marco is conducting an experiment. He knows the wave that he is working with has a wavelength of 32.4 cm. If he measures the frequency as 3 hertz, which statement about the wave is accurate?
The wave has traveled 32.4 cm in 3 seconds.
The wave has traveled 32.4 cm in 9 seconds.
The wave has traveled 97.2 cm in 3 seconds.
The wave has traveled 97.2 cm in 1 second.
Answer: D. the wave has traveled 97.2 cm in 1 second.
Explanation:
Got it right on edge, hope this helps :)
Answer:
D
Explanation:
It is
Is this right? Please help me
Answer:
variable
Explanation:
meaning diffent
Fill in the blanks to complete the sentence.
Light acts like a
when it bounces off surfaces, and acts like a
when it bends around objects.
The answer is:
Fill in the blanks to complete the sentence.
Light acts like a PARTICAL when it bounces off surfaces,
and acts like a WAVE when it bends around objects.
I hope this helps you :>
Answer:
Particle and wave
Explanation:
When fireworks explode, sound and light are produced. These are examples of
macroscopic outputs
microscopic outputs
microscopic inputs
macroscopic inputs
Answer: Macroscoptic Output
Explanation:
Answers to the rest:
1. B) macroscopic outputs.
2.A) a microscopic change creating a macroscopic output
3.B) Because the energy levels of the electrons in different metals are usually not the same, different metals usually emit different colors of visible light.
4.A) Heat is applied to a solid, causing its molecules to move quickly.
5.A) strontium, sodium, copper, potassium
When fireworks explode, sound and light are produced, these are examples of macroscopic outputs.
The macroscopic scale is a scale where objects are large enough to be visible using the eyes or any other sense.Fireworks produce sufficient sound and light to be observed without the need for any specific device.Conversely, microscopic scale refers to the scale in which we cannot be observed by using the eye and we need specific tools to observe these phenomena (e.g., a microscope).In conclusion, when fireworks explode, sound and light are produced, these are examples of macroscopic outputs.
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I need it ASAP please
Answer:
Number 3 is C
Explanation:
It just makes sence
Select the community facility which usually has a driving range on the property to practice your swing.
A Bowling Alley
B Fitness Center
C Golf Course
D YMCA
Answer:
golf course
Explanation:
i will give you all the answers you desire, my love
a student compared two samples of matter he recorded the results in this chart which property do the two samples have in common
Answer:
私は知らない
Explanation:
I have been dehydrated 3 times in my life. Is it good or bad that I am going to start to drink 4 water bottles everyday now? FYI I am underweight.
Answer:
yes
Explanation:
because you will be hydrated
Answer:
Its good because you can survive without food but you cant survive without water. Extra water can replace empty, sugary calories many people drink with meals.
Explanation:
why is it better system for units?
Answer:
Because it's so much simpler and easier to use. The metric system is an improvement over the English system in three major points: One unit of measurement for each physical quantity. No matter from which other quantities of the SI system derived, yields always the same unit.
Explanation:
Please I need help with this question (see image).
Show workings where necessary.
Answer:
The specific heat capacity of something is simply the amount of heat energy required to raise 1g of that substance or object by 1°C.
The specific heat capacity of something is simply the amount of heat energy required to raise 1g of that substance or object by 1°C.It is given by the formula Q = mcΔT, where Q is the energy transferred (J), m is the mass of the substance (kg), c is the specific heat capacity, and ΔT is the temperature change (°C).
To prevent dehydration when exercising on hot and humid days it is vital to:
Drink plenty of water only after you have exercised to avoid throwing up.
Drink water before, during, and after your exercise activity.
Wear fabric which keeps your sweat next to your body for cooling purposes.
Wear tight, constrictive clothing to help with aerodynamics.
Answer:
Drink water before, during, and after your exercise activity.
Jeff is driving a remote controlled car around his living room. The car has a mass of 770 g. Jeff drives the car with a velocity of 4.1 m/s. What is the momentum of the car?
Answer:
3.16kgm/s
Explanation:
Given parameters:
Mass = 770g
Velocity = 4.1m/s
Unknown:
Momentum of the car = ?
Solution:
To solve this problem, we use the equation below:
Momentum = mass x velocity
Convert the mass to kg;
770g to kg = 0.77kg
Now;
Momentum = 0.77 x 4.1 = 3.16kgm/s
How do scientists study pollen grains to help them understand climate change?
by analyzing and making inferences about them
by observing and listing facts about them
by studying and reading more about them
by writing hypothesis about them
Answer: A. by analyzing and making inferences about them
Explanation:
Answer:
by analyzing and making inferences about them
Explanation:
a substance that vigorously reacts with most metals to produce hydrogen, readily conducts electricity, turns litmus red, and has a pH less than 7; typically corrosive or sour-tasting.
A: suspension
B: base
C: acid
D: colloid
Answer:
C. Acid
Explanation:
If you have chemistry classes and performed experiments regarding acids and bases, you would physically tell it's acid if the lithmus paper turned red and base if it turned blue. Also, in the pH level chart, there are only two characteristics--acidic and basic. Since it has less than 7 pH, it is definitely acid. Plus, remember the taste of some vitamin C tablets? It has a sour taste to it, isn't it? This is because of ascorbic acid.
The given properties are indicating the substance is acid. Therefore, option (C) is correct.
What are acids and bases?An acid can be described as any substance that is capable of losing a proton to another substance. A base can be described as a molecule or ion that can accept a hydrogen ion from an acid.
Acidic substances can be identified by their sour taste. Acid is usually a molecule that donates an H⁺ ion and can be energetically favorable after a loss of an H⁺ ion. Acids are also capable to turn blue litmus into the red.
Bases can be characterized by a slippery texture and a bitter taste. A base that can be dissolved in water as an alkali. When bases and acids react, they form salts and water. Bases can turn red litmus into blue.
The acid reacts vigorously with most metals to form hydrogen. Acidic substances have pH of less than 7.
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Can somebody mee plzzz?
Answer: I think the answer is d
Explanation:
Light is refracted as it crosses the air-water.
Hope it helps :)
Which statement describes an example of constructive interference?
A. Two TV signals reach an antenna and cancel each other out.
B. Light forms bars on a surface after passing through two slits.
C. Oil spilled in a water puddle shows different colors of light.
D. A cell-phone signal is lost when you pass through a certain area.
Answer:
b
Explanation:
because Constructive interference occurs when the maxima of two waves add together (the two waves are in phase), so that the amplitude of the resulting wave is equal to the sum of the individual amplitudes. Equivalently, the minima of the waves would be aligned.
In the reaction _S+302 +2SO3, what coefficient should be placed in front of the S to balance the reaction?
A. 1
B. 2
C. 3
D.5
Answer:
B. 2
Explanation:
The reaction expression is given as:
_S + 3O₂ → 2SO₃
Now let us balanced the expression;
On the product side we have 2 moles of S
On the reactant side we should have 2moles of S
So, we put the coefficient 2 to balance the expression;
We have 6 moles oxygen on both sides
Which two options describe behaviors of particles that are related to the
chemical properties of the materials?
A. Allowing electrons to move freely between them
B. Easily forming bonds with atoms of other elements
C. Changing their positions relative to one another
O
D. Combining with oxygen atoms to form a new substance
Answer:
B
Explanation:
When The conduct of particles is connected to the chemical properties of the materials. The two options are correct B and D.
What are Chemical Properties?
A property of a substance connecting to its chemical reactivity (as the incendiary effects of nitroglycerin).
Chemical stability and oxidation circumstances, different chemical properties include: Essentially, the chemical property is a differentia that may only be commemorated as an influence of a chemical reaction.
Therefore, The two correct options are B. Efficiently forming bonds with atoms of different elements and D. Converging with oxygen atoms to form a unique substance.
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A baseball player hits a baseball with a bat. The mass of the ball is 0.25 kg. The ball accelerates at 200 m/s2. What is the force, to the nearest N, of the bat on the baseball?
Answer:
50N
Explanation:
Force (N) = mass (kg) × acceleration (m/s²)
0.25kg times 200m/s² = 50N
The apparent height of a building 10.5 km away is 0.02 radians. What is the approximate height of the building to the nearest meter
Answer:
Approximate height of the building is 23213 meters.
Explanation:
Let the height of the building be represented by h.
0.02 radians = 0.02 × [tex]\frac{180^{o} }{\pi }[/tex]
= 0.02 x (180/[tex]\frac{22}{7}[/tex])
0.02 radians = 1.146°
10.5 km = 10500 m
Applying the trigonometric function, we have;
Tan θ = [tex]\frac{opposite}{adjacent}[/tex]
So that,
Tan 1.146° = [tex]\frac{h}{10500}[/tex]
⇒ h = Tan 1.146° x 10500
= 2.21074 x 10500
= 23212.77
h = 23213 m
The approximate height of the building is 23213 m.
Cellular respiration occurs in every cell of our bodies. Through this process, we obtain the
energy we need for life. During cellular respiration, oxygen helps in breaking down sugar
molecules into carbon dioxide and water molecules. Which reaction correctly represents the
cellular respiration process? (1 point)
Answer:
1)The reactants are unlit charcoal, and the products are charcoal that has already burned and released its energy.
2)sugar + oxygen → carbon dioxide + water + energy
3)iron + oxygen → rusted iron + energy
4)an endothermic reaction, because ice absorbs heat to become liquid water
5)The temperature of the reactants is greater than the temperature of the products.
Explanation:
100%
Identify the career that matches the description.
Runs the front desk at a hotel or motel: Hotel/Motel Clerk
Oversees other employees at a hotel or motel: Hotel/Motel Supervisor or Manager
Cleans the interior of buildings: Housekeeper/Cleaning Worker
Helps guests at places of lodging with personal services: Concierge
Handles luggage for travelers: Porter/Bellhop
The answers to them are in each line behind the :'s.
Answer: 1.Hotel/Motel Clerk 2.Hotel/Motel Supervisor or Manager 3.Housekeeper/Cleaning Worker 4.Concierge 5.Porter/Bellhop
What is profession?
A successfully professionalized field of employment is referred to as a profession.
It can be characterized as a disciplined team of people, professionals, who uphold ethical standards, present themselves as, and are recognized by the public as possessing, special knowledge and skills in a widely acknowledged body of learning derived from research, education, and training at a high level, and who are prepared to apply this knowledge and exercise these skills in the interest of others.
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What is double jeopardy
Answer:
the prosecution of a person twice for the same offense.
Which statement describes how the photoelectric effect causes an electric
current to form?
O A. Light acts as particles, causing electrons on the surface it strikes
to be destroyed.
B. Light acts as a wave, causing electrons to flow in different
directions within an atom.
C. Light acts as particles, knocking electrons off the surface it
strikes.
O D. Light acts as a wave, causing electrons to flow from one atom to
another.
Answer: C
Explanation: I just took the test
Answer:
C. Light acts as particles, knocking electrons off the surface it
strikes.
Explanation:
an airplane flies with a constant speed of 640km/h. how far can it travel in 45 minutes?
Answer:
the answer is 483.75 I believe
A car which is traveling at a velocity of 1.6 m/s undergoes an acceleration of 9.2 m/s over a distance of 540 m. How fast is it going
after that acceleration?
Answer:
Vf = 99.7 m/s
Explanation:
In order to find the final velocity of the car, we will use the third equation of motion. The third equation of motion is given as follows:
[tex]2as = V_{f}^{2} - V_{i}^{2}[/tex]
where,
a = acceleration of the car = 9.2 m/s²
s = distance traveled by the car = 540 m
Vf = Final Speed of the car = ?
Vi = Initial Speed of the car 1.6 m/s
[tex]2(9.2\ m/s^{2})(540\ m) = (V_{f})^{2}-(1.6\ m/s)^{2}\\V_{f}^{2} = 9936\ m^{2}/s^{2} + 2.56\ m^{2}/s^{2}\\\\V_{f} = \sqrt{9938.56\ m^{2}/s^{2}}[/tex]
Vf = 99.7 m/s
Explain how the processes of igneous rock formation change the geosphere.
The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation. Any rock can transform into any other rock by passing through one or more of these processes. This creates the rock cycle.
How much power does a toaster have if it does 1,000 joules of work in 30 seconds?
Answer:
33.33Watts
Explanation:
Given parameters:
Work done = 1000J
Time taken = 30s
Unknown:
Power = ?
Solution:
To solve this problem, we must understand that power is the rate at which work is done.
So;
Power = [tex]\frac{Work done }{time}[/tex]
Now insert the parameters:
Power = [tex]\frac{1000}{30}[/tex] = 33.33Watts
Question 4 of 10
If infrared waves can move information through air, what is the advantage of
sending their signals through networks of cables?
A. Cables are easy to maintain.
B. These waves need to travel only short distances.
C. Cables transmit infrared waves over longer distances.
O D. The denser the medium, the faster the wave.
Answer:
C. Cables transmit infrared waves over longer distances.
Explanation:
A.pex
Answer:
The answer is C.Cables transmit infrared waves over longer distances.
Explanation:
I took AP EX quiz.
a hurricanes energy comes from?
Answer:
a or b
Explanation:
Answer:
The answer is C, condensation or large amounts of water vapor and the second question is correct too.
Explanation: