From our physics class, we know that Work is a product of Force and Displacement. The force must be the force in the same direction with the displacement. So force and displacement must be parallel.
A. How much work in J does the string do on the boy if the boy stands still?
Since we know that: Work = Force * Displacement
and in this case displacement is equal to zero, therefore Work must also be equal to zero.
Work = 0
B. How much work does the string do on the boy if the boy walks a horizontal distance of 11m away from the kite?
Now are given a displacement of 11 m which is a horizontal distance. Therefore we must first calculate the horizontal component of force:
Fx = 4.5 N * cos 30
Fx = 3.897 N
So work is:
Work = 3.897 N * 11 m
Work = 42.87 J ~ 43 J
The string does 49.5J of work on the boy when he stands still, -49.5J when he walks away from the kite, and 49.5J when he walks toward the kite.
Explanation:The work done by the tension in the string on the boy can be calculated using the formula:
Work = Force * Distance * cos(θ)
where θ is the angle between the force vector and the displacement vector. In this case, the tension force is acting horizontally, so the angle between the force and displacement vectors is 0 degrees.
Therefore, for the first scenario (boy standing still), the work done by the string is:Work = 4.5N * 11m * cos(0°)
Since cos(0°) = 1, the work done by the string is:Work = 4.5N * 11m * 1 = 49.5J
In the second scenario (boy walking away from the kite), the displacement vector is in the opposite direction of the tension force, so the angle between them is 180 degrees.
Therefore, the work done by the string is:Work = 4.5N * 11m * cos(180°)
Since cos(180°) = -1, the work done by the string is:Work = 4.5N * 11m * -1 = -49.5J
In the third scenario (boy walking toward the kite), the displacement vector is aligned with the tension force, so the angle between them is 0 degrees.
Therefore, the work done by the string is:Work = 4.5N * 11m * cos(0°)
Since cos(0°) = 1, the work done by the string is:Work = 4.5N * 11m * 1 = 49.5J
Learn more about Work done by tension in a string here:https://brainly.com/question/14003719
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Which winds are affected by specific landforms on earth's surface?
A) Westerlies
B) Polar Easterilies
C) Trade Winds
D) Local Winds
For numbers 2 and 3, which one is compression and which one is rarefaction?
Please help have no clue on this
HELP PLEASE ASAP!!!!
Which of the following terms describes how mountains form?
A: Gradually
B: Rapidly
C: Explosively
D: Destructively
What is chemical stimuli
Which of the following is an element?
A. Water
B. Carbon Dioxide
C. Oxygen
D. Ammonia
Oxygen (C) is the element among the given options. It is a pure substance found on the periodic table as 'O', while the other choices are compounds consisting of various elements combined.
The question which of the following is an element? A. Water B. Carbon Dioxide C. Oxygen D. Ammonia - requires identifying the pure element from a list that includes compounds. An element is a substance that consists of only one type of atom, whereas a compound is a substance made from more than one type of atom joined by chemical bonds.
Out of the given options, Oxygen (C) is the correct answer. Oxygen is an element that is listed on the periodic table as 'O'. It is also one of the seven diatomic molecular elements, meaning it's commonly found as two atoms of oxygen bonded together (O₂). In contrast, water (H₂O), carbon dioxide (CO₂), and ammonia (NH₃) are compounds made up of hydrogen, carbon, and nitrogen atoms joined with oxygen in different combinations.
This force on compass dials is an example of a force that _______.
A. needs electricity to act.
B. acts through particles in the air
C. acts only on contact.
D. acts at a distance.
acts at a distance
is the answer
Read the paragraph.
Long ago people made buildings by fitting boards together. Then they learned to shape metals. The invention of nails followed.
Which word does the underlined prepositional phrase modify?
A. the verb made
B. the noun people
C. the verb learned
D. the noun buildings
Can Some One Help Me Please its Language Arts
Answer:a
Explanation:
took quiz
What happens to the particles of the liquid inside a thermometer when the thermometer is heated?
They slow down and spread apart.
They speed up and spread apart.
They slow down and move closer together.
They speed up and move closer together.
Speed up and spread apart
what is the difference between magnetism and a magnetic field
Magnetism is a force that can attract "pull toward" or repel "push away" some materials. Certain elements such as cobalt, iron, and nickel. are strongly attracted by a magnetic force and are called ferromagnetic.
A magnetic field is the area of space around a magnet where magnetism is detected. The poles are where the magnetic field is the strongest. The larger the magnet, the greater its magnetic field is.
Which type of rock can form if extreme heat and pressure are applied to sedimentary rock?
A) granite
B) igneous rock
C) metamorphic rock
D) sedimentary rock
Answer:
c
Explanation:
Planets, stars, asteroids and other celestial bodies have generally round shapes. Some are ovals, others really bumpy circles, and some are a very squished oval. Why are none triangular or rectangular?
How would you calculate the spring constant of an unknown spring?
Final answer:
To find the spring constant, apply Hooke's Law using the formula F = kx, where F is force due to gravity (mg), and x is the stretch distance. For a 10.0 kg mass stretching the spring 8.00 cm, the spring constant is calculated as 1225 N/m.
Explanation:
To calculate the spring constant (k) of a spring, you can use Hooke's Law, which is F = kx, where F is the force applied to the spring, and x is the displacement of the spring from its equilibrium position. In the scenario where a spring stretches 8.00 cm (or 0.080 meters) for a 10.0 kg load, the force exerted by the load (F) can be found using the force due to gravity, which is F = mg. The mass (m) is 10.0 kg, and the acceleration due to gravity (g) is approximately 9.80 m/s². Thus, F = (10.0 kg) × (9.80 m/s²) = 98.0 newtons (N).
Now that we know F and x, we can solve for the spring constant (k):
k = F/x
k = 98.0 N / 0.080 m
The spring constant k is 1225 N/m.
Tim observes that a force pulls him down when he jumps up in the air. Based on his observation, which conclusion is correct?
Gravitational force is a contact force.
Gravitational force helps objects float.
Gravitational force pushes an object up.
Gravitational force is a non-contact force.
Answer:
Gravitational force is a non-contact force.
Explanation:
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a track coach with a meter stick and a stopwatch is trying to determine if a student is walking with constant speed.he should...
If you have a mineral sample with a volume of 4 ml and a mass of 20 grams , what is the density ?
The density of a mineral sample with a volume of 4 ml and a mass of 20 grams is 5 grams per milliliter (g/ml).
If you have a mineral sample with a volume of 4 ml and a mass of 20 grams, the density can be calculated using the formula:
Density = Mass / Volume
Substituting the given values into the formula, we get:
Density = 20 grams / 4 ml = 5 grams per milliliter (g/ml).
A 3.0-kg block sits on top of a 5.0-kg block which is on a horizontal surface. The 5.0-kg block is pulled to the right with a force F⃗ as shown in the figure. The coefficient of static friction between all surfaces is 0.57 and the kinetic coefficient is 0.43. What is the minimum value of F needed to move the two blocks?
Final answer:
The minimum value of the force needed to move the two blocks is approximately 27.93 N.
Explanation:
To determine the minimum value of the force needed to move the two blocks, we need to consider the friction between the blocks and the surface. Since the coefficient of static friction is given, we can use it to find the maximum static friction force:
Fstatic_max = μstatic × N
where μstatic is the coefficient of static friction and N is the normal force. Since the 3.0-kg block is sitting on top of the 5.0-kg block, the normal force on the 5.0-kg block is equal to its weight:
N = m × g
where m is the mass of the 5.0-kg block and g is the acceleration due to gravity. Once the force F is greater than the maximum static friction force, the blocks will begin to move. The minimum value of F needed to move the two blocks is therefore equal to the maximum static friction force:
F = Fstatic_max
Substituting the given values, the equation becomes:
F = μstatic × (m × g)
Plugging in the values, we get:
F = 0.57 × (5.0 kg × 9.8 m/s²)
Simplifying, we find that the minimum value of F needed to move the two blocks is approximately 27.93 N.
What is meant by saying that a wave has a low frequency?
A. The wave is very tall
B. The wave is very long
C. Few wave peaks pass a point in one second
D. A large number of wave peaks pass a point in one second.
our boss asks you compare two sound waves and determine which has the higher frequency. Wave A has a period of 4⁄100 second and Wave B has a perio of 1⁄7 second.
What does the force of gravity on an object depend on?
A. the object's mass
B. compounds
C. molecules
D. charged particles
Which of these is an example of a physical change? Question options: wood decaying iron melting paper burning steel rusting
Final answer:
Iron melting is an example of a physical change because it involves a state change without altering the substance's chemical composition.
Explanation:
An example of a physical change from the options provided is iron melting. Physical changes are characterized by a change in the state or properties of matter without altering its chemical composition. When iron melts, it changes from solid to liquid, but the substance remains iron; its molecules are not changed. Other examples of physical changes might include boiling water, dissolving sugar in water, or breaking a mirror. Conversely, wood decaying, paper burning, and steel rusting involve chemical reactions that create new substances, thus, they are chemical changes.
A graph that shows that the pressure of a gas varies inversely with its volume under constant temperature demonstrates
A. The pressure law
B. The density law
C. Charle’s law
D. Boyle’s law
state the law of refraction
Answer:
The law of refraction states that the incident ray, the refracted ray, and the normal to the interface, all lie in the same plane.
Explanation:
Answer:
1 ) angle of incidence is always equal to the angle of reflection
2) the incidence ray , the normal at the point of incidence and the reflection ray , all lie in the same plane
what is the main type of heat transfer in liquids and gases?
A. Insulation
B. Convection
C. Thermal Radiation
D. Thermal Conduction
Answer: B convection
Explanation: cause :)
Final answer:
The primary heat transfer mechanism in liquids and gases is convection, which involves the movement of the fluid itself to transport heat. Conduction and radiation are the other two methods of heat transfer, with conduction involving direct contact and radiation involving electromagnetic waves.
Explanation:
The main type of heat transfer in liquids and gases is convection. Convection is the heat transfer by the macroscopic movement of a fluid, such as water or air. This process involves the circulation or movement of the fluid itself, which carries heat from one place to another. An example of convection in action is the way warm air rises and cool air falls, setting up a cycle that distributes heat throughout a room.
Heat transfer can also occur through conduction when heat is transferred through direct contact between materials, and radiation, which is the transfer of energy by electromagnetic waves and does not require a medium. These are the three fundamental methods of heat transfer: convection, conduction, and radiation.
Which of the following make up the nucleus of an atom?
why does glass expands before water?
PLEASE HELP!!!!!!!!!!!
Will it float? YES or NO
Ice = 0.92g/cm3
Wood = 0.45 g/cm3
What did early South American civilization do to promote farming
all but one statement applies to electromagnetic radiation
Answer:
Its D can i get brainliest
Explanation:
Dylan is the best athlete in our school. He plays football, basketball, and baseball and does the pole vault for the track team. He can vault up to five and seventy-three hundredths meters. If he would like to be able to pole vault up to six and twelve hundredths meters, how many more centimeters does he need to pole vault to reach his goal?