a book is sitting on a desk. what best describes the normal force acting on the book
Answers
the upward force the desk pushes on the book.
from the free body diagram of the book, it is clear that on the book, there are two forces acting.
1) normal force F by the desk in Upward direction.
2) force of gravity by earth in downward direction.
The Upward normal force by the desk on the book balances the force of gravity by earth in downward direction. that is why the book remains stationary on the desk.
The normal force acting on the book is a supporting force that is equal in magnitude and opposite in direction to the book's weight, keeping it in static equilibrium.
Explanation:A book is sitting on a desk, and the best description of the normal force acting on the book is that it is a supporting force exerted by the desk that is perpendicular to and away from the surface. This force is necessary to support the weight of the book, counteracting the force of gravity and preventing the book from accelerating downwards. Newton's third law of motion tells us that this normal force is equal in magnitude and opposite in direction to the force that the book exerts on the desk, which is its weight due to gravity. In this instance, if the desk exerts an upward force of 32 N, this is because the book's weight (force due to gravity) is also 32 N, resulting in a state of static equilibrium where the net external force on the book is zero.
Related Questions
Which of the following statements about gravitational potential energy is not true?
A.Its magnitude is related to the work done by lifting an object.
B It depends on the choice of a coordinate system.
C. It is equal to the force required to move an object times the distance it is moved.
D.It is equal to the kinetic energy of the falling object at y = 0.
Answers
Answer:
B and D
Explanation
Gravitational potential energy does not relate to graphs and it is about a moving object so b and d would not be correct
The option is (C). Gravitational potential energy is equal to the force required to move an object times the distance it is moved.
The force needed to move an object multiplied by the distance traveled is not a direct equation for the gravitational potential energy. The position or height of an object within a gravitational field, rather than the force used to move it, determines the gravitational potential energy.
Gravitational potential energy is directly related to the work involved in lifting an object against the force of gravity, and its size is inversely proportional to the work involved in lifting an object. The change in potential energy is equal to the quantity of work that is completed.
It depends on the coordinate system chosen: The choice of a reference point or a location with zero potential energy in a selected coordinate system determines the gravitational potential energy. Usually, this reference point is placed at a suitable area, like the Earth's surface.
It is equivalent to the falling object's kinetic energy at y = 0: As an item descends to a reference point where its potential energy is zero, gravitational potential energy can be totally converted to kinetic energy. According to the principle of energy conservation, the potential energy is completely transformed into kinetic energy at that point (y = 0).
Hence, the option is (C). Gravitational potential energy is equal to the force required to move an object times the distance it is moved.
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What does Newton’s law of universal gravitation say about the distance between objects?
Answers
It says: The bigger the distance between objects the smaller the gravity between them.
An atom contains 15 neutrons and has a mass number of 30. What is its atomic number? How did you determine the atomic number?
Answers
Answer:
15
Explanation:
The mass number is defined as the total number of protons and neutrons. The atomic number is total number of protons. And since we have the mass number and number of neutrons, we can use simple subtraction (30 - 15) to find that the atomic number is 15.
The atomic number is found by subtracting the number of neutrons from the mass number; thus, with 15 neutrons and a mass number of 30, the atomic number is 15.
The atomic number can be determined by subtracting the number of neutrons from the mass number. Given that the atom contains 15 neutrons and has a mass number of 30, we can find the atomic number by using the formula: atomic number = mass number - number of neutrons.
This yields an atomic number of 15 (30 - 15 = 15), which indicates that there are 15 protons in the atom.
true or false refraction occurs when the amplitude of a wave changes as it goes from one medium to aother
Answers
The answer here is true
Final answer:
Refraction is the bending of light waves as they pass from one medium to another and involves a change in speed and direction, not amplitude. The statement provided is false.
Explanation:
The statement provided by the student is false. Refraction is the bending of light waves, which occurs when a light wave passes from one medium to another, such as air to glass. The key aspect of refraction is the change in direction of the wave due to a change in its speed as it moves between media with different densities. However, refraction does not involve a change in the amplitude of the wave, but rather a change in the wave's speed, and, consequently, its wavelength. Moreover, the frequency of the wave remains constant during this process.
Which is the primary consumer in this food chain? rabbit grass snake hawk
Answers
Answer:
The Rabbit!
Explanation:
Because primary consumers (the rabbit) consume producers (the grass).
In the given food chain Rabbit is the primary consumer.
Explanation:
Primary consumers are herbivore which will consume plants that produce their food using photosynthesis. A primary consumer feeds on primary producers. The food chain is the consumption chain from producer through level of consumers.
Some of the examples of primary consumers are as follows,
Ruminants – Goat, cow, rabbit, and giraffe are some animals that come under this category. Zooplankton – Microorganisms fall under this category.Write a hypothesis about how the mass of a cart affects the acceleration of the cart. Use the "if . . . then . . . because . . .” format and be sure to answer the lesson question: "How do force and mass affect the acceleration of an object?”
Answers
edge sample response for lab :
If the fan speed increases, then the acceleration increases because a greater fan speed supplies more energy to move the cart.
If the mass of the cart is increased, then the acceleration of the cart is decreased and vice versa
The mass of a cart is inversely proportional to the acceleration of the cart. Inverse proportionality means that increase in one quantity leads to decrease in the other quantity.
Hence, if the mass of the cart is increased, the acceleration of the cart increases and if the mass of the cart is decreased, the acceleration of the cart is increased.
The force applied to an object is directly proportional to the acceleration given to the object when the mass of the object is kept constant. F= ma
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In any energy transformation, energy is _____.
Answers
Answer:
In any energy transformation, energy is the change of energy from one form to another.
In any energy transformation, energy is Conduction.
The conversion of one form of energy into every other, or the motion of electricity from one location to every other. A strength transformation is the change of strength from one shape to any other. The cloth that doesn't conduct warmness, electricity, light, or sound. electricity or pressure an object has because of its motion.
Conduction is the system via which warmness electricity is transmitted through collisions between neighboring atoms or molecules. Conduction occurs more with ease in solids and drinks, in which the particles are closer collectively than in gases, in which debris are similarly apart.
While electricity is transferred from one part of a machine to every other?Conduction is the switch of power from one molecule to another by direct contact. This switch happens when molecules hit each differently, much like a game of pool where one moving ball strikes the other, causing the second to move.
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Why do objects under water appear to be bigger or closer than what they do in air?
Answers
An object seen in the water will usually appear to be at a different depth than it actually is, due to the refraction of light rays as they travel from the water into the air.
The tip of the fan blade is 0.61 m from the center of the fan. The fan turns at a constant speed and completes 2 rotation every 1.0s
Answers
Answer:
What is the centripetal acceleration of the tip of the fan blade?
6.0 m/s2
48 m/s2
53 m/s2
96 m/s2
Answer is 96
Explanation:
Answer:
d
Explanation:
A student drew this diagram of Woese’s modern system of classification.
DOMAIN
KINGDOM
PHYLUM
ORDER
CLASS
FAMILY
GENUS
SPECIES
What is the error in this diagram?
The top level is missing.
The class and order levels are switched.
The bottom level is missing.
The kingdom and family levels are switched.
Answers
Answer:
The class and order levels are switched
Explanation:
Woese's classification starts with a division in three parts of all the organisms, which is their domain, so according to him there's Bacteria, Archaea, and Eukaryota. After the domain we have the kingdom, then phylum, class, order, family, genus, and species at the end.
We can take the leopard as an example:
Domain - Eukaryota
Kingdom - Animalia
Phylum - Chordata
Class - Mammalia
Order - Carnivora
Family - Felidae
Genus - Panthera
Species - Panthera pardus
Which of the following mechanical waves has the most energy
A
B
C
D
Answers
the answer is d because it has the smallest wavelength
Explanation:
Mechanical wave are the waves that requires a medium for its propagation. The energy of wave is given by the following formula as :
[tex]E=\dfrac{hc}{\lambda}[/tex]
Where
h = Planck's constant
c = speed of light
[tex]\lambda[/tex] = wavelength
So, the energy of wave is inversely proportional to its wavelength.
From the given figure, the distance between two consecutive crests and trough is minimum in figure (4). So, figure (4) has most energy.
Anyone who answers this correctly, i will mark as brainiest.
Constructive interference results in a wave with a ____ amplitude than any of the component waves.
Answers
Answer:Constructive interference results in a wave with a greater amplitude than any of the component waves.
Explanation:
through which type of media can mechanical waves move ?
Answers
Answer: Solids, liquids, and gasses.
Explanation:
well a mechanical wave is a disturbance in matter that carries energy from one place to another, and a medium (or media because you put the question in pluralised form) is matter through which a wave travels. So, Solids, liquids, and gasses.
A house painter uses the chair-and-pulley arrangement of (Figure 1) to lift himself up the side of a house. The painter's mass is 55 kg and the chair's mass is 10 kg .
If the painter is at rest, what is the tension in the rope?
Answers
Answer:
Explanation:
Draw a free body diagram for the painter. There are three forces acting on him. The tension in the rope pulling him up, the normal force of the chair pushing him up, and gravity pulling him down.
Apply Newton's second law:
∑F = ma
T + N - W = ma
Since the painter is at rest, a = 0.
T + N - W = 0
T = W - N
T = Mg - N
Now draw a free body diagram of the chair. The chair has three forces acting on it also. The tension in the rope pulling it up, the normal force pushing down, and gravity pulling down.
Newton's second law for the chair:
∑F = ma
T - W - N = ma
Since the chair is also not accelerating, a = 0:
T - W - N = 0
T = W + N
T = mg + N
Now we have two equations and two variables. If we add the equations together, we can eliminate N:
2T = Mg + mg
2T = (M + m) g
T = (M + m) g / 2
Given that M = 55 kg, m = 10 kg, and g = 9.8 m/s²:
T = (55 + 10) (9.8) / 2
T = 318.5 N
If we round to two sig-figs, the tension in the rope is 320 N.
The tension in the rope is 637 Newtons, which is the total weight of the painter and chair multiplied by the acceleration due to gravity (9.8 m/s^2). This is because the system is at rest, so the tension in the rope must balance out the downward force of gravity.
Explanation:The subject of this question is Physics, specifically when discussing forces and tension in ropes. The situation describes a house painter who is on a chair, lifted by a pulley system, and the entire system is at rest. We assume that the only forces acting on the system are gravity and the tension in the rope.
Both the painter and the chair are experiencing a downward force due to gravity. We can calculate this by multiplying their mass by the acceleration due to gravity (which is about 9.8 m/s^2 on Earth). For the painter, this is 55 kg * 9.8 m/s² = 539 N. For the chair, it is 10 kg × 9.8 m/s² = 98 N.
Because the system is at rest, the rope must be exerting an equal and opposite force upwards, to balance out the force of gravity. This force is the tension in the rope. If we add up the forces acting on the painter and the chair, we get a total of 539 N + 98 N = 637 N. So, the tension in the rope is 637 Newtons.
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(a) Figure 1 shows a mas of 1200 kg hung by a massless cable supported by a counterweight of mass 900 kg. You may assume the gravitational acceleration to be 10 m/s2.
Determine the magnitude of the acceleration (in m/s2) of the 1200 kg mass and also the magnitude of the tension (in N) in the cable. Show your workings clearly.
Please help me bcoz I don't really understand how to do without a proper explanation behind the working. I'm quite weak in this subject, I m sorry :(
Answers
Answer:
1.43 m/s², 10,300 N
Explanation:
First things first is to draw a picture. Fortunately, one was already provided.
Next, we need to draw a free body diagram for each mass.
The 1200 kg mass has two forces acting on it: tension pulling up and weight pulling down.
Similarly, the 900 kg mass has two forces acting on it: tension pulling up and weight pulling down.
Now we apply Newton's second law. Let's start with the 1200 kg. If we say that up is positive, then:
∑F = ma
T - W = M(-a)
T - Mg = -Ma
Notice that I made the acceleration negative. That's because we know that the heavier mass will be accelerating down.
Now we apply Newton's second law to the 900 kg mass:
∑F = ma
T - W = ma
T - mg = ma
Now we have two equations and two unknowns (T and a). Let's solve for the acceleration first. To do that, let's subtract the two equations so we can eliminate T (if you prefer, you can also use substitution instead):
-mg − (-Mg) = ma − (-Ma)
-mg + Mg = ma + Ma
g (M - m) = a (M + m)
a = g (M - m) / (M + m)
Given that M = 1200 kg, m = 900 kg, and g = 10 m/s²:
a = 10 m/s² (1200 kg - 900 kg) / (1200 kg + 900 kg)
a = 10/7 m/s²
a ≈ 1.43 m/s²
Now let's find the tension by plugging our answer into either of the two equations.
T - mg = ma
T - (900 kg) (10 m/s²) = (900 kg) (10/7 m/s²)
T = 72000/7 N
T ≈ 10,300 N
I'm not sure what rounding rules you need to follow, but hopefully this helps.
5. The load across a battery consists of two resistors, with values of 15 Ohm and 45 Ohm connected in series.
a) What is the total resistance of the load?
b) What is the voltage of the battery if the current in the circuit is 0.1 A?
Answers
a) [tex]60 \Omega[/tex]
The total resistance of resistors connected in series is equal to the sum of the individual resistances:
[tex]R=R_1 + R_2 + .... + R_n[/tex]
In this problem, we have two resistors connected in series:
[tex]R_1 = 15 \Omega[/tex]
[tex]R_2 = 45 \Omega[/tex]
So the total resistance of the circuit is
[tex]R=R_1 + R_2 = 15 \Omega + 45 \Omega = 60 \Omega[/tex]
b) 6.0 V
The relationship between voltage, current and resistance of a circuit is given by Ohm's law
[tex]V=RI[/tex]
where
V is the voltage
R is the total resistance
I is the current
In this circuit, we have
[tex]R=60 \Omega[/tex] is the total resistance
I = 0.1 A is the current
So, the voltage of the battery is
[tex]V=(60 \Omega)(0.1 A)=6.0 V[/tex]
What is the purpose of each of the components (each shown with leader and line) of the circuit shown is the diagram?
Answers
The wires is what is needed to put together the whole thing, kinda like glue when you're gluing a piece of paper on it.
Anyways, the battery is the main source and main energy per say.
That energy that comes from the battery, thanks to the wires, it can transfer that said energy to both the switch and light bulb.
And as you flick the switch, it depends of how you put it together, there's two options, turning the light bulb on or turning it off.
Though it doesn't mean that since the light bulb is connected to the battery makes the bulb turn on no matter what since the switch can cancel the main source's energy.
- Ouma :>
what is meniscus in Physics?
Answers
The curve at the liquid's surface by which you measure the volume of a liquid.
Which statement describes Rutherford model of an atom
Answers
Answer:
what are the statements
Explanation:
Answer:
Almost all the mass and all the positive charge of the atom is concentrated in a very small region called the nucleus and the negative charge was distributed throughout the rest of the atom
Explanation:
Rutherford's experiment was to bombard a gold foil with alpha particles, finding that most of the particles change their direction very little, some change it a lot and very few almost recede; With these measurements he came to the conclusion that almost the entire mass of the atom had to be in a very small space that I call a nucleus, in addition as the alpha particles have two positive charges so that there is a force of repulsion the charge of the nucleus must also be positive; with this I enunciate an atomic model:
Almost all the mass and all the positive charge of the atom is concentrated in a very small region called the nucleus and the negative charge was distributed throughout the rest of the atom
Why does a hot air balloon rise?
A. The weight of the air displaced by the balloon is less than the volume of the balloon.
B. The weight of the balloon is less than the weight of the air displaced by the balloon.
C. The volume of the air displaced by the balloon is less than the volume of the balloon.
Answers
Answer:
B. The weight of the balloon is less than the weight of the air displaced by the balloon.
Explanation:
Hot air balloons rise because of buoyancy (The force that cause objects to rise in the air). In order for the balloon to float, in needs to be lighter (less dense) than the surrounding air. By adding lighter hot air, It's causes the balloon to have less weight that the air it displaces.
Answer:B.
The weight of the balloon is less than the weight of the air displaced by the balloon.
Explanation:gradpoint
This chart shows characteristics of three different types of atoms. Which statement is best supported by the information in the chart? Atom X will donate electrons to Atom Y. Atom X will accept electrons from Atom Y. Atom Y will accept electrons from Atom Z. Atom Z will donate electrons to Atom X. 99 PTS FOR ANSWER
Answers
- Atom X will accept electrons from Atom Y.
Answer:
Atom X will accept electrons from Atom Y is correct!
if two identical cars are traveling at different velocities, which car has the greatest momentum
Answers
Answer:
The one with highest velocity
Explanation:
The momentum of an object is given by
[tex]p=mv[/tex]
where
m is the mass of the car
v is the velocity of the car
In this problem, we have two identical cars: identical means they have same mass, so
[tex]m_1 = m_2 = m[/tex]
The momentum of car 1 is
[tex]p_1 = mv_1[/tex]
while the momentum of car 2 is
[tex]p_2 = mv_2[/tex]
By comparing the two expressions, we see that the car with greatest momentum is the one with highest velocity, since the mass is the same.
Because water molecules are polar and carbon dioxide molecules are nonpolar, Question 9 options: water has a lower boiling point than carbon dioxide does. carbon dioxide cannot exist as a solid. attractions between water molecules are weaker than attractions between carbon dioxide molecules. water has a higher boiling point than carbon dioxide does.
Answers
Answer:
The correct answer is: Water has a higher boiling point than carbon dioxide does.
Explanation:
Ok, because water is a polar molecule and its bonds are hydrogen bonds, this causes its boiling point to be higher than that of carbon dioxide, since hydrogen bonding is more resistant to rupture (in this case when heating), on the other hand carbon dioxide has convalent bonds, which are weaker. Therefore, the water will have a boiling point higher than that of carbon dioxide, since it costs more to break its polar bonds. This will also be true for any molecule that has hydrogen bonding links and is polar.
Zooflagellates belong to the phylum
a. Monera
b. Protista
c. Fungi
d. Plantae
Answers
Answer:
Zooflagellates belong to the phylum Protista.
Fill in the blanks to complete the statements.
If an object changes speed on
results in acceleration
its velocity also changes. Any change in
Answers
Answer:
When an object changes speed (increases/decreases) it results in acceleration/de acceleration, its velocity also changes.
Explanation:
Acceleration is the rate of change in velocity.An object can accelerate when speed increases, decreases or direction changes. All these instances involves a change in velocity.Velocity is a vector quantity thus it has magnitude and the direction.Acceleration due to change in direction is centripetal acceleration.The expression for finding acceleration is;
a=change in velocity/change in time
a=Δv/Δt in m/s²
Answer:
direction and velocity
what type of wave travels faster through solids than it does through gases?
Answers
Answer:
Liquids are more dense than gases, but less dense than solids, so sound travels 2nd fast in liquids. Gases are the slowest because they are the least dense: the molecules in gases are very far apart, compared with solids and liquids.
Explanation:
Answer:
Longitudinal waves travels faster through solids than it does through gases
Explanation:
As we know that longitudinal waves travels through all types of mediums and the speed of longitudinal waves is given as
[tex]v = \sqrt{\frac{E}{\rho}}[/tex]
here we know that
E = elasticity of the medium
[tex]\rho[/tex] = density of the medium
now here we know that elasticity of solids is much more than the elasticity of gases
So the speed of longitudinal waves in solids is more than the speed of waves in gases
When talking on a phone, the voice is transformed into electrical energy. This energy passes over wires or is transmitted through the air. Into what kind of energy does the speaker in the phone on the other end change the electrical energy?
Answers
Answer:
sound energy
Explanation:
Answer:
sound energy perriod
On an amusement park ride passengers accelerate straight downward from rest to 22.9 m/s in 2.2 s.
What is the average acceleration of the passengers on this ride?
Answers
Given,
Initial Velocity (u) = 0 m/s
Final Velocity (v) = 25.9 m/s
Time (t) = 2.5 sec
avg. acceleration = ?
avg. acceleration = v-u/t
avg = 25.9/2.5 = 10.36 m/s²
avg = 10.36 m/s²
Answer:
Acceleration, [tex]a=10.4\ m/s^2[/tex]
Explanation:
Given that,
Initial velocity of the ride, u = 0 (at rest)
Final speed of the ride, v = 22.9 m/s
Time taken, t = 2.2 s
Let a is the acceleration of the passengers on this ride. It can be calculated using the formula of the acceleration as :
[tex]a=\dfrac{v-u}{t}[/tex]
[tex]a=\dfrac{22.9-0}{2.2}[/tex]
[tex]a=10.4\ m/s^2[/tex]
So, the time required to bring the car to a stop is [tex]10.4\ m/s^2[/tex]. Hence, this is the required solution.
A group of organisms that is able to interbreed is called a
a. kingdom
b. family
c. class
d. species
Answers
Answer:
D species
Explanation:
According to the most widely used species definition, the biological species concept, a species is a group of organisms that can potentially interbreed, or mate, with one another to produce viable, fertile offspring. In this definition, members of the same species must have the potential to interbreed.
Please help me
The pitch of a sound is determined by its wavelength and speed together, or its ______ alone.
Answers
Answer:
Speed
Explanation:
Answer:
frequency
Explanation: