Glass is a _____ conductor of heat.
A 70 kg box is slid along the floor by a 400 N force. The coefficient of friction between the box and the floor is 0.50 when the box is sliding. Find the acceleration of the box
The acceleration of the box of mass 70 Kg sliding along the floor and havin 0.5 coefficient of friction is 0.81 m/s².
We'll begin by calculating the frictional force opposing the motion. This can be obtained as follow:Mass (m) = 70 Kg
Coefficient of friction (µ) = 0.5
Acceleration due to gravity (g) = 9.8 m/s²
Normal reaction (N) = mg = 70 × 9.8 = 686 N
Frictional force (F) =?F = µN
F = 0.5 × 686
F = 343 NThus the frictional force is 343 N.
Next, we shall determine the net force acting on the box. This can be obtained as follow:Force applied (F) = 400 N
Frictional force (Fբ) = 343 N
Net force (Fₙ) =?Fₙ = F – Fբ
Fₙ = 400 – 343
Fₙ = 57 NThus, the net force acting on the box is 57 N
Finally, we shall determine the acceleration of the box. This can be obtained as follow:Mass (m) = 70 Kg
Net force (Fₙ) = 57 N
Acceleration (a) =?Fₙ = ma
57 = 70 × a
Divide both side by 70
a = 57 / 70
a = 0.81 m/s²Therefore, the acceleration of the box is 0.81 m/s².
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The most common listening problem is
A. trying to listen to two people at once.
B. assuming what the other person has to say isn't important.
C. paying attention but misinterpreting the message.
D. not giving other people a chance to talk.
Mark for review (Will be highlighted on the review page)
What is the value of work done on an object when a 10-newton force moves it 30 meters and the angle between the force and the displacement is 25°?
WHY did NASA scientist Madhulika Guhathakurta compare the solar eclipse to the 1969 moon landing?
A) The moon landing illustrated the importance of scientific discovery in 1969, and she believes the solar eclipse will be remembered as a similarly important event today.
B) The moon landing was a landmark event in 1969 that demonstrated the importance of NASA, a fact she is using to persuade President Trump not to cut NASA funding.
C) The solar eclipse is similar to the moon landing because both used new technologies to share information about scientific events with the public.
D) The solar eclipse is similar to the moon landing because they both relate to space and discovery despite occurring nearly 50 years apart.
The solar eclipse is compared to the 1969 moon landing due to their significance in space and discovery, despite the time gap. Both events captivated the public and demonstrated advancements in technology and our understanding of the universe.
Explanation:NASA scientist Madhulika Guhathakurta compared the solar eclipse to the 1969 moon landing because both events were significant in terms of space and discovery, despite occurring nearly 50 years apart. The moon landing was a historic achievement in human space exploration, and the solar eclipse, while not a human accomplishment, is a rare celestial event that offers valuable scientific insights. Both events captivated the public and showcased the advancements in technology and our understanding of the universe.
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If you are riding in a vehicle equipped with a lap belt and also a separate shoulder belt, you are
Riding in a vehicle with a lap belt and a separate shoulder belt provides significant protection in car accidents. The lap belt secures the lower body while the shoulder belt secures the upper body.
Explanation:If you are riding in a vehicle equipped with a lap belt and also a separate shoulder belt, you are using one of the most effective safety measures for passenger vehicles. These belts, when used together, greatly reduce the chance of serious injury or death in a car accident. The lap belt secures your lower body, preventing you from sliding forward or sideways, while the shoulder belt protects your upper body, preventing you from being ejected from the vehicle or hitting the interior elements during a collision.
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You place a book on top of a spring and push down, compressing the spring by 10 cm. When you let go of the book, it is pushed up by the spring. Which statement describes what happens to the energy of the spring-book-system?
Answer: The gravitational potential energy of the system increases.
Explanation:
What substance is reduced in a lead storage battery?
In lead acid battery, chemical reactions are induced to do work on charge and produce a voltage difference between the two output terminals.
In a lead storage battery, the negative terminal is composed of lead electrode (Pb2+) while in the positive terminal it is composed of lead dioxide electrode (PbO2).
The chemical half reactions in each electrode are:
Negative Terminal: Pb2+ + SO4(2-) ---> PbSO4 + 2e
Lead electrode is oxidized to supply electrons.
Positive Terminal: PbO2 + H2SO4 + e ---> PbSO4
Lead dioxide electrode is reduced by the addition of electrons.
Answer: Lead dioxide is reduced.
Jack tries to place magnets on the door of his refrigerator. He observes that the magnets don’t stick. He guesses that the door of the refrigerator is made of a nonmagnetic substance. What stage of scientific investigation does his guess represent?
ask questions
construct a hypothesis
explain the results
make observations
Answer:the one above
Explanation:
the one above
As a solid element melts, the atoms become __________ and they have __________ attraction for one another. more separated, more more separated, less closer together, more closer together, less larger, greater
Provides some background for this problem. a ball is thrown vertically upward, which is the positive direction. a little later it returns to its point of release. the ball is in the air for a total time of 7.70 s. what is its initial velocity? neglect air resistance.
Imagine a landing craft approaching the surface of callisto, one of jupiter's moons. if the engine provides an upward force (thrust) of 3264 n, the craft descends at constant speed; if the engine provides only 2203 n, the craft accelerates downward at 0.39 m/s2. what is the weight of the landing craft in the vicinity of callisto's surface?
Final answer:
The weight of the landing craft on the surface of Callisto is 3264 N, derived by analyzing the force provided by the craft's engine in two different scenarios according to Newton's second law of motion.
Explanation:
The question involves understanding Newton's second law of motion, which is F = ma, where F is the net force applied to the object, m is the mass of the object, and a is the acceleration.
When the engine provides an upward force (thrust) of 3264 N, the craft descends at a constant speed, implying that the thrust balances out the weight of the craft (weight = gravitational force). Therefore, the net force, F, is zero, and the acceleration is 0 m/[tex]s^{2}[/tex]. When the thrust is only 2203 N, the craft accelerates downward at 0.39 m/[tex]s^{2}[/tex]. To find the weight of the landing craft on Callisto's surface, we can use the given data from the two scenarios.
To solve, let's denote the mass of the landing craft as m, and the acceleration due to gravity on Callisto as g. Thus, the weight of the landing craft, which is the gravitational force, can be expressed as W = mg.
From the second scenario, we have:
F - W = ma
2203 N - mg = m(0.39 m/[tex]s^{2}[/tex])
Since the first scenario tells us that F = W when F is 3264 N, substituting back, we get mg = 3264 N. We therefore find the weight of the landing craft to be 3264 N on the surface of Callisto.
Water turning into steam represents what kind of change
With respect to energy, which is not necessarily a goal of chemistry ?
Answer:
I believe I know your answer choices, the answer would be finding ways to use energy
Explanation:
In chemistry we have a way to store the power, we use batteries to store this energy, so it can’t be this. We also have a way to produce it consistently, using wind power and solar panels. We currently are making strides to conserve energy, by sharing consumptions graphs with others. Chemistry is all about finding the use for it! There possibilities never end, which makes this goal, and more importantly, the answer.
The acceleration due to the earth's gravity, in si units, is 9.8 m/s2. in the absence of air friction, a ball is dropped from rest. its speed on striking the ground is exactly 60 m/s. for what time interval was the ball falling?
Variable A and variable B have an indirect relationship. If variable A decreases, how will variable B respond?
What energy is calculated from an object's mass height and the acceleration due to gravity?
A railroad freight car with a mass of 29,000 kg is moving at 2.2 m/s when it runs into another car with a mass of 30,000 kg the second car is at rest the cars locked together what is the final velocity
Answer:
1.1 m/s for apex 4.1.6.
Explanation:
i clicked that option and it was right
Which attribute do employers state is the bestone for an office professional to have?
A. Punctuality B. Computer proficiency C. Integrity D. Positive attitude
Answer:
Option C integrity.
Step-By-Step Explanation:
The best attribute for an office professional to have is Integrity
Because if you are following integrity you will be in ethical manner whoever say anything to you.Your mind will not make you to lose your values which is the most important thing in anybody's life.
If you do not have integrity you may lose and you lose your temper you will get quite or pretty much aggressive and you may get fired.
What types of collisions can result from making unsafe passes?
What causes a regular reflection?
A. Light waves strike a rough, uneven surface at a 45 degree angle and are reflected back at a 90 degree angle.
B. Parallel light waves strike a smooth, polished surface and reflect back in the same direction.
C. Parallel light waves strike a rough, uneven surface and reflect in different directions.
D. Light waves strike a smooth, polished surface at a 90 degree angle and are reflected back at a 45 degree angle.
Answer:
Option B. Parallel light waves strike a smooth, polished surface and reflect back in the same direction.
Explanation:
Thinking process:
Light possess a dual nature. It has got wave properties as well as particle (electron-like) properties. This means that light travels in pockets or quanta.
When lights hits a smooth shiny surface, it is immediately reflected back. This can be expressed by the wave equation:
[tex]sin i = sin r[/tex]
Where i is the incident ray - the ray that hits the surface
an r is the reflected ray - the ray that leaves the surface.
If the surface is polished and even, it means that the angle of incident is equal to the angle of reflection.
Hence option B is correct.
If you divide a force measured in newtons (1 newton = 1 kg*m/s^2) by a speed expressed in meters per second, in what units will the answer be expressed?
About one-third of the toxic metal, mercury (hg), is released into the air from natural sources, such as rocks, soil, volcanoes, and the ocean. the remaining two-thirds comes from ____.
a. human activities
b. waste from livestock
c. airplane exhaust
d. automobile exhaust
e. mercury-rich plants
About one-third of the toxic metal, mercury (Hg), is released into the air from natural sources, such as rocks, soil, volcanoes, and the ocean. the remaining two-thirds comes from human activities.
What is mercury?Mercury is the 80th element in periodic table. It is a heavy metal but exists as liquid in room temperature. Mercury is a transition metal having wide applications in various industries.
Mercury is toxic in nature and reported to be dangerous to human health, even causes death by concentric exposure. Global mercury contamination is a result of human activities including mining and the burning of fossil fuels.
Mercury that is released into the air eventually sinks into the ground or is washed into the water. Once deposited, specific microbes can transform it into methylmercury, a very poisonous form that accumulates in fish, shellfish, and animals that consume fish.
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On the ignition switch, the ________ position provides power to electrical equipment including lights, wipers, warning lights and radio, without turning on the engine.
ACC is an Autonomous cruise control or adaptive cruise control is a system for road vehicles that automatically adjusts the vehicle speed (can increase or decrease the speed) to maintain a safe distance from vehicles ahead.
There are also many other names of Autonomous cruise control such as active cruise control, intelligent cruise control, or radar cruise control.
How long (in ns) does it take light to travel 1.30 m in vacuum?
an input force of 20 newtons is applied to a lever at a distance of 2 meters from the fulcrum and object 0.5 M away from the fulcrum and on the other side is lifted by the 20-N force what is the output force?
The distance between twin satellites that were originally 150 meters apart are now 300 meters apart. Which best describes the gravitational force between the twin satellites? A) it increased by 1/2 B) it decreased by 1/4 C) it increased by a factor of 2 D) it decreased by a factor of 4
Answer : (B) it decreased by 1/4
Explanation :
It is given that :
The distance between twin satellites that were originally 150 meters apart are now 300 meters apart.
When the satellites are 150 m apart then the gravitational force is :
[tex]F=G\dfrac{m_1m_2}{(150\ m) ^2}[/tex]..........(1)
Similarly, when the satellites are 300 m apart then the gravitational force is :
[tex]F'=G\dfrac{m_1m_2}{(300\ m) ^2}[/tex]...........(2)
From eq (1) and (2)
[tex]\dfrac{F_c}{F_c'}=4[/tex]
[tex]F_c'=\dfrac{F_c}{4}[/tex]
So, the gravitational force between the twin satellites is decreased by 1/4.
Hence, the correct option is (b).
Answer:
B: it decreased by 1/4
Explanation:
a skydiver falls 3km in 15s. How fast are they going. i need my answer in meters! (20 PTS)
What is the difference between accurate data and reproducible data?
Answer:
Accuracy is ‘the state of being correct’ and on the other hand precision is ‘the state of being exact.
Explanation:
Accuracy shows the nearness of the measurement with the actual measurement while precision shows the nearness of an individual measurement with other measurements.
Accuracy focuses on the errors caused by the problem in the instrument. while precision is concerned with errors, which occurs periodically with no recognizable pattern.
If the measurement is precise but inaccurate, the result will not be the expected one. And if the result is accurate but imprecise, then there are huge variations in the measurements. And finally, if the actual measurement is neither accurate nor precise, then the result would not have correctness and exactness at the same time.
how long does it take to walk 0.13 miles