The mass of the box is 8.5 kg.
What is mass?Mass can be defined as the quantity of matter contained in a body.
To calculate the mass of the box, we use the formula
Formula:
F = mgμ............. Equation 1Where:
F = Forcem = mass of the boxg = acceleration due to gravity μ = coefficient of frictionMake m the subject of the equation
m = F/gμ..................... Equation 2From the question,
Given:
F = 25 Ng = 9.8 m/s²μ = 0.3Substitute these values into equation 2
m = 25/(0.3×9.8)m = 25/2.94m = 8.5 kgHence, the mass of the box is 8.5 kg.
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A woman launches a boat from one shore of a straight river and wants to land at the point directly on the opposite shore. If the speed of the boat is 10 mph and the river is flowing east at 5mph, in what direction should she head the boat in order to arrive at the desired landing point
Answer:
If she stands on the North side of a river flowing to the East at 5 mph,
she must head towards the SouthWest to arrive on the South side of the river directly across from her starting point and we have
x^2 + 5^2 = 10^2 where x is her speed directly across the river
x = (75)^1/2 = 8.66 mph towards the South
sin theta = 5 / 10 = 1/2
She must angle the boat at 30 deg from straight South
Why is a Magnetar extremely magnetic?
Answer:
The dominant theory of the strong fields of magnetars is that it results from a magnetohydrodynamic dynamo process in the turbulent, extremely dense conducting fluid that exists before the neutron star settles into its equilibrium configuration.
How strong is a magnetar magnetic field?
It can generate the most intense magnetic field observed in the Universe. The field strength of a magnetar is one thousand trillion times stronger than Earth's and is so intense that it heats the surface to 18 million degrees Fahrenheit. We only know of about 10 magnetars in the Milky Way galaxy.
Drag the tiles to the correct boxes to complete the pairs.
Identify the type of potential energy described.
Plants have more food is the chemical energy.
Two north magnetic poles have been brought together is the magnetic energy.
A person has walked to the top of hill posses gravitational potential energy.
A balloon has gained negative charged after being rubbed with a wool cloth is the electric energy.
A spring has been compressed inside a toy.
What is energy?Energy is the ability to do work.
There are different kind of energies like kinetic energy, potential energy, gravitational energy, heat energy, elastic energy, chemical energy, etc.
Thus, the statement are connected to the correct type of potential energies.
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what are the similarities and differences between how living and non-living things fly.
Flying animals utilize their wings to create both lift and propulsion by moving them in relation to the body.
What are living and nonliving things?They both consist of fundamentally simple building blocks. They are composed of substance or mass. Atmospheric and molecular building blocks make up the world.
The differences between how living and non-living things fly;
1. Moving both living and non-living objects consumes energy. Flying animals utilize their wings to create both lift and propulsion by moving them in relation to the body.
In contrast to most air vehicles where the components that generate lift wings and thrust engines or propellers are distinct and the wings stay stationary.
Animal aviators like birds as well as natural parachuters like patagial as well as human inventions like aircraft as well as rockets that can power spacecraft and spaceplanes are just a few examples of the many things that can fly.
Hence there are similarities and differences between how living and non-living things fly.
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1. Find the force if the mass is 6 kg and the acceleration is 12 m/s/s
Answer:
The answer to the question is 72N
The formular for calculating force is;
Force = Mass× acceleration due to gravity
therefore 6kg×12m/s/s = 72N
Which best explains why the receiver of a signal must understand the code or language being used
The receiver of a signal must understand the code or language being used to avoid confusion and losses.
What is a Signal?This is usually in the form of a sound or body movement and is involved in conveying messages to people.
The receiver must understand the code or language in order to prevent confusion or loss of lives and properties.
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when we throw an arrow by streching the string of a bow , how does the energy change take place ?
when we throw an arrow , we first stretch the string of the bow. while stretching the string of the bow, the work done by us in stretching the bowstring gets stored as potential energy in the bow. This potential energy of the bow is transformed into kinetic energy when the bowstring is released and this gives the momentum and Kinetic energy to the arrow.
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When an arrow is drawn back by a bow, the work done by us in stretching the bowstring gets stored at potential energy in the bow. This potential energy of bow is transformed into kinetic energy when the bowstring is released and this gives kinetic energy to the arrow.
All the best!
Does paint and cardboard have joints in it
when the formula m*g=F-Fg is used?
The formula (ma = F - Fg) is used to determine the net upward force acting on a body.
What is net upward force acting on a body?The net upward force acting on a body is the resultant or sum of all the upward forces acting on a body at a given time.
ma = F - Fg
where;
F is the applied forceFg is the force of gravityma is the resultant forceThus, the formula (ma = F - Fg) is used to determine the net upward force acting on a body.
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Read the scenario below and answer the question that follows.
Jean has been increasingly hyperactive, staying up all night, and finishing her work assignments in record time during the past few weeks. She feels it is a big improvement from how she felt before, when she was worried about losing her job, had trouble concentrating, and felt extremely irritable.
Jean is most likely suffering from __________ disorder.
A.
major depressive
B.
bipolar
C.
phobic
D.
generalized anxiety
A 20.00 kg lead sphere is hanging from a hook by a thin, massless wire 2.80 m long and is free to swing in a complete circle. Treat the sphere as a point mass. Suddenly it is struck horizontally by a 5.00 kg steel dart that embeds itself in the lead sphere. What must be the minimum initial speed of the dart so that the combination makes a complete circular loop after the collision
The minimum initial speed of the dart so that the combination makes a complete circular loop after the collision is 58.5 m/s.
Minimum speed for the object not fall out of the circle
The minimum speed if given by tension in the wire;
T + mg = ma
T + mg = m(v²)/R
tension must be zero for the object not fall
0 + mg = mv²/R
v = √(Rg)
Final speed of the two mass after collisionUse the principle of conservation of energy
K.Ef = K.Ei + P.E
¹/₂mvf² = ¹/₂mv² + mg(2R)
¹/₂vf² = ¹/₂v² + g(2R)
¹/₂vf² = ¹/₂(Rg) + g(2R)
vf² = Rg + 4Rg
vf² = 5Rg
vf = √(5Rg)
vf = √(5 x 2.8 x 9.8)
vf = 11.7 m/s
Initial speed of the dartApply principle of conservation of linear momentum for inelastic collision;
5v = vf(20 + 5)
5v = 11.7(25)
5v = 292.5
v = 58.5 m/s
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What is the energy of the photon emitted when an electron in a mercury atom drops from energy level f to energy level b?
1.
8.42 ev
2.
5.74 ev
3
3.06 ev
4.
2.68 ev
The energy of the photon emitted when an electron in a mercury atom drops from energy level f to energy level b is 3.06 eV.
Change in energy level of the electronWhen photons jump from a higher energy level to a lower level, they emit or radiate energy.
The change in energy level of the electrons is calculated as follows;
ΔE = Eb - Ef
ΔE = -2.68 eV - (-5.74 eV)
ΔE = 3.06 eV
Thus, the energy of the photon emitted when an electron in a mercury atom drops from energy level f to energy level b is 3.06 eV.
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A chemical reaction is the only way to separate a(n)
Answer:
pure substance
Explanation:
yw
What happens to the cost of goods when inflation increases?
OA. The cost of goods decreases.
B. The cost of goods increases.
OC. The cost of goods stays the same.
OD. The cost of goods varies.
Answer:
The answer is B
Explanation:
Generally speaking, a company selling goods during periods of inflation will see an increase in its cost of goods sold.When inflation increases, the cost of goods increases. The correct option is B.
Generally speaking, inflation raises the price of products sold. The price of producing and purchasing those things rises together with the prices of goods and services owing to inflation.
This can be attributable to elements like escalating manufacturing costs, rising input costs, and shifting dynamics of supply and demand.
As a result, companies might need to modify their pricing plans to take inflation-related cost increases into account, the cost of goods typically increases when inflation occurs.
Thus, the correct option is B.
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HURRY A spring with a spring constant of 350 N/m pulls a door closed. How much work is done as the spring pulls the door at a constant velocity from an 85.0-cam stretch to a 5.0-cm stretch?
In stretching or compressing the spring by a distance of x (in meters), one performs 1/2 (350 N/m) x² of work on the spring, or equivalently the spring performs -1/2 (350 N/m) x² of work on the door. This work is negative since the restoring force of the spring opposes the force used to stretch or compress the spring.
Then when the spring is allowed to relax, it performs 1/2 (350 N/m) x² of work to return it to equilibrium position. The force from the spring acts in the direction of the door's motion, so the work done is positive once more.
Now, the work done on the door …
• … to return it from 85.0 cm = 0.850 m to equilibrium is
1/2 (350 N/m) (0.850 m)² = 126.4375 J
• … to return it from 5.0 cm = 0.050 m to equilibrium is
1/2 (350 N/m) (0.050 m)² = 0.4375 J
• … to relax from 85.0 cm to 5.0 cm from equilibrium is
126.4375 J - 0.4375 J = 126 J
Explain how horizontal motion can be uniform while vertical motion is accelerated.
How will projectile motion be affected when drag due to air resistance is taken into
consideration?
Question 7 of 10
which type of insurance policy covers liability that exceeds the coverage of a
regular insurance policy?
o a. health insurance
o b. disability insurance
Answer: it’s actually umbrella
Explanation: because
11) The total conversion of 2.50 kilogram of the
Sun's mass into energy yields
(1) 9.31 x 102 MeV
(2) 8.38 x 10¹⁹ MeV
(3) 1.41 x 1030 MeV
(4) 2.25 x 10¹7 MeV
1.41 × 10³⁰ MeV
As we know, E=mc², where E is energy, m is mass and c is the speed of light(i.e. 3×10⁸ m/s).
Given mass = 2.5 kgs
∴ E = (2.5)×(3×10⁸)² J = 22.5×10¹⁶ J
As our answer is in joules so we have to convert it into mega electron volt(MeV)
1 J = 6.242 × 10¹² MeV
⇒ 22.5×10¹⁶ J = 22.5×10¹⁶ × (6.242 × 10¹²) MeV
⇒1.41 × 10³⁰ MeV
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A plastic rod that has been charged negatively touches a neutral metal sphere. What kind of charged particle was transferred between the rod
Answer:
Negative particles will be transferred to the sphere,
Assuming the sphere is not grounded the sphere will be negatively charged when the plastic rod is withdrawn,
(The sphere can be positively charged by grounding the sphere and bringing the rod close to the sphere and then remove the grounding to the sphere)
Care must be taken in noting if and when the sphere is grounded.
What's the frequency of the wave below?
Answer:
2 Hz
Explanation:
the frequency of a wave is how many waves pass in one second. So, to find the frequency of this wave, we should look at how many wave cycles have occurred at 1 second.
2 full wave cycles are shown between 0.0 seconds and 1.0 seconds, making the frequency 2 Hz
There are uniform cubes in a toy box, a child makes a pillar using these cubes on a rough plane which is inclined to the horizontal at angle theta. The cubes do not slide on each other. If tan theta = 1/8, the max no. of cubes that can be stacked is,
A. 4
B. 5
C. 8
D. 16
Please explain the methods of obtaining the ans . Will mark the brainliest for the best ans
The maximum number of cubes that can be stacked on the inclined plane without sliding is determined as 8.
Net force on the box
The net force on the box can be used to determine the maximum number of cubes that can be stacked without sliding.
The stack cubes must be at equilibrium.
∑Fx = 0
nW - μFₙ = 0
where;
n is number of the cubesFₙ is the normal force of the cubesW is the weight of the cubes acting parallel to the planen(mg)sinθ - μmgcosθ = 0
n(mg)sinθ = μmgcosθ
nsinθ = μcosθ
let the coefficient of friction = 1nsinθ = cosθ
n = cosθ/sinθ
n = 1/tanθ
n = (1)/(1/8)
n = 8
Thus, the maximum number of cubes that can be stacked on the inclined plane without sliding is determined as 8.
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The amount of energy required to raise the temperature of one gram of water by one celsius degree is called a
The amount of energy required to raise the temperature of one gram of water by one celsius degree is called a calorie.
How can you define calorie?
In physics, we can define it as a unit of measurement that defines the amount of energy to raise the temperature of 1 gram of water by 1°C. Each material has its unique calorie, however by definition we use water as it is the lowest of all the elements.
Normally, calorimetry is directly linked with the thermal capacity that an element has to contain heat.
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The water in this pot is in the process of changing from a liquid to a gas. Thermal energy is still being added to the water as it vaporizes, but its temperature and the motion of its particles are not increasing. What do you think is happening to the extra energy?
The extra energy allows the molecules to convert states of molecules.
What is heating?When the temperature is increased , the body or particle is said to be heating.
The water in this pot is in the process of changing from a liquid to a gas. Thermal energy is still being added to the water as it vaporizes, but its temperature and the motion of its particles are not increasing.
When the liquid is converted to gas, the temperature reaches the boiling point of water. After boiling, the heat added up will only make the particles to convert its phase and go away in then atmosphere.
Thus, extra energy added helps molecules of water to change its state from liquid to solid.
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Help meeee is for tomorrow, plssss!!!
2) For the association of resistors below:
a) The equivalent resistor between A and B.
b) The total electric current that runs through the circuit, knowing that the electrical voltage between terminals A and B is valid 21 V(volts).
c) The value of the electric current passing through the resistor of 1.0 Ohm.
d) The power dissipated through the 8.0 Ohm resistor.
(a) The equivalent resistance of the circuit is 0.52 ohms.
(b) The total electric current that runs through the circuit is 40.38 A.
(c) The value of the electric current passing through the resistor of 1.0 Ohm is 21 A.
(d) The power dissipated through the 8.0 Ohm resistor is 55.13 W.
Equivalent resistance of the circuitThe equivalent resistance of the circuit is calculated as follows;
1/R = 1/(1 + 1) + 1/(2 + 2 + 2) + 1/(6) + 1/(2) + 1/8 + 1/8 + 1/6 + 1/6
1/R = 1/2 + 1/6 + 1/6 + 1/2 + 1/8 + 1/8 + 1/6 + 1/6
1/R = 1 + 2/3 + 1/4
1/R = 23/12
R = 12/23
R = 0.52 ohms
Total current through the circuitV = IR
I = V/R
I = 21/0.52
I = 40.38 A
Current through 1 ohm resistorV = IR
I = V/R
I = 21/1
I = 21 A
Power dissipated through 8 ohm resistorP = V²/R
P = (21)²/8
P = 55.13 W
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The next closest star to Earth, Proxima Centuri, is 4.25 lightyears away. How far is that in meters?
Answer:
4.0208 x 10^16 meters
Explanation:
speed of light in m/s * # seconds in a year * 4.25 years =
2.99792 x 10^8 * 3600*24*365.25 * 4.25 = 4.0208 x 10^16 m
The arrows in the diagram show the direction of the magnetic fields of the atoms that make up an object. Which sentence best describes the object? A. The object is made of nonmagnetic material. B. The material of the object can attract a magnet. C. The object is weakly magnetic. OD. The material of the object can be magnetized.
Option D, the sentence that best describes the object is the material of the object can be magnetized.
Atoms of magnetic materialThe direction of the magnetic fields of the atoms that make up an object is always aligned towards the north pole or south of the material.
Objects that are made of unmagnetised materials such iron, cobalt and nickel are attracted to either pole of a magnet, but not repelled.
The diagram given shows unmagnetised material, and hence the material of the object can be magnetized.
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When vehicle wheels are about to lock, the ABS senses the impending lock up and prevents this from occurring. a) True b) False 2 Question 2 Electronic stability control reduces the risk of rollover crashes, such as are common with SUVs. a) True b) False 3 Question 3 _______________have the ability to control wheel lock on all four tires. a) Four-wheel anti-lock brakes b) Rear-wheel anti-lock brakes c) All anti-lock brakes d) None of the above 4 Question 4 _______________is a technology that works to help maintain vehicle control and steering capability in the event of a skid. a) Parking/emergency brake b) Service brakes c) Anti-lock Braking system d) None of the above 5 Question 5 ___________ reduce the impact forces of a crash exerted upon a vehicle's occupants by allowing parts of the front of the vehicle to crush at varying rates. a) Electronic Stability Control b) Anti-lock Braking Systems c) Crumple Zones d) Traction Control Systems 6 Question 6 The Traction Control System (TCS) is designed to help maintain traction on a vehicle in hazardous conditions or situations. a) True b) False 7 Question 7 A driver operating a vehicle with traction control should brake for the feature to activate. a) True b) False 8 Question 8 Air bags in trucks or other vehicles that do not have a rear seat will have an on/off switch that can be activated for children under age 12. a) True b) False 9 Question 9 All vehicles are equipped with Anti-lock Braking Systems. a) True b) False 10 Question 10 Airbags may deploy in the _______ of the passenger or driver, or from the ____of the vehicle.
The answers to the questions are:
True TrueFour-wheel anti-lock brakesAnti-lock braking systemCrumple zonesTrue FalseTruefalseFront, sidesWhat is ABS?ABS is known as an Anti-lock braking systems (ABS) that act in the capacity of steering one in times in emergencies by bringing back traction to one's tires.
Note that it often helps to hinder wheels from locking up and helping the driver to be able to steer to safety.
When vehicle wheels are about to lock, the ABS senses the impending lock up and prevents this from occurring is true as that is its function.
Note that Electronic stability helps to control helps to the risk of rollover crashes, such as are common with SUVs.
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Suppose a 2662 kg giant seal is placed on a scale and produces a 20.0 cm compres- sion. If the seal and spring system are set into simple harmonic motion, what is the period of the oscillations
Answer:
0.8976 seconds
Explanation:
The period of oscillation for the simple harmonic motion can be found using the formula ...
T = 2π√(d/g)
where d is the displacement of the spring due to the attached weight, and g is the acceleration due to gravity.
__
For d = 0.20 meters, the period is ...
T = 2π√(0.20/9.8) ≈ 0.8976 . . . . seconds
_____
Additional comment
The formula for the oscillator period is usually seen as ...
T = 2π√(m/k)
where m is the mass in the system and k is the spring constant. The value of the spring constant is calculated from ...
k = mg/d
Using that in the formula, we find it simplifies to ...
[tex]T=2\pi\sqrt{\dfrac{m}{k}}=2\pi\sqrt{\dfrac{m}{\left(\dfrac{mg}{d}\right)}}=2\pi\sqrt{\dfrac{d}{g}}[/tex]
10. In Freudian theory, which one of the following is an example of a Thanatos instinct, which includes aggression, trauma, and risky behaviors?
A. going to school.
B. seeking nourishment.
C. joining a basketball club.
D. substance abuse.
In Freudian theory, substance abuse is one of the following an example of a Thanatos instinct, It includes aggression, trauma, and risky behaviors, Therefore the correct answer is option D
What is the Freudian theory?The psychoanalytic approach to adult personality development is built on the theories of Sigmund Freud. His beliefs addressed four topics: level of consciousness, personality structure, and stages of psychosexual development. These personality qualities interact to create anxiety, which needs to be controlled via a range of defense mechanisms. These strategies mask the true, anxiety-related causes of one's conduct.
Freud's theories also have limited applicability to the fields of gerontology and geriatric medicine because they postulate that personality development related to his stages of psychosexual development essentially ends in adolescence.
Thus, Substance abuse is one of the Thanatos instincts, which also include aggression, trauma, and risky behavior, according to Freudian theory. Option D is the correct answer.
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A scientist claims that a certain type of fabric is better able to repel water than another. Which option describes an experiment that will produce evidence that will support or refute her claim?
A. Test groups of each kind of fabric by exposing them to the same amount of water for the same amount of time.
B. Test groups of each kind of fabric by exposing them to the same amount of water for different amounts of time?
C. Test a group of one kind of fabric by spraying water on it, and a group of the other fabric by submerging it.
D. Test a group of one fabric by spraying it with distilled water, and a group of the other fabric by spraying it with salt water.
The best way would be to test groups of each kind of fabric by exposing them to the same amount of water for the same amount of time. The correct option is A.
Scientific experimentsIn conducting scientific experiments to compare test subjects such as the fabrics mentioned in the illustration, the test subjects must be subjected to the same conditions.
The outcome of the experiment will no longer be scientifically valid if the test subjects are not exposed to the same condition.
Thus, the two fabrics must be exposed to the same amount of water for the same amount of time in order to come to a valid conclusion about which is a better water repeller among the two.
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