The boy's mass can be determined by applying the law of conservation of momentum. The mass of the skateboard is given as 2.0 kg, and the jug of water has a mass of 8.0 kg.
The jug is thrown forward with a speed of 3.0 m/s relative to the ground, while the boy and skateboard move in the opposite direction at 0.60 m/s. To find the boy's mass, we can use the equation:
[tex]\[(m_{\text{{boy}}} + m_{\text{{skateboard}}}) \cdot v_{\text{{boy}}} = m_{\text{{jug}}} \cdot v_{\text{{jug}}}\][/tex]
where [tex]\(m_{\text{{boy}}}\)[/tex] is the boy's mass, [tex]\(m_{\text{{skateboard}}}\)[/tex] is the skateboard's mass, [tex]\(v_{\text{{boy}}}\)[/tex] is the boy's velocity, [tex]\(m_{\text{{jug}}}\)[/tex] is the jug's mass, and [tex]\(v_{\text{{jug}}}\)[/tex] is the jug's velocity.
Rearranging the equation to solve for [tex]\(m_{\text{{boy}}}\)[/tex], we have:
[tex]\[m_{\text{{boy}}} = \frac{{m_{\text{{jug}}} \cdot v_{\text{{jug}}}}}{{v_{\text{{boy}}}}} - m_{\text{{skateboard}}}\][/tex]
Substituting the given values, we get:
[tex]\[m_{\text{{boy}}} = \frac{{8.0 \, \text{{kg}} \cdot 3.0 \, \text{{m/s}}}}{{0.60 \, \text{{m/s}}}} - 2.0 \, \text{{kg}}\][/tex]
Simplifying the equation, we find:
[tex]\[m_{\text{{boy}}} = 38 \, \text{{kg}}\][/tex]
Therefore, the boy's mass is 38 kg.
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what is terrestrial magnetism
Answer:
it the phenomenon which deals with earth's magnetic condition
A box of books weighing 315 N is shoved across the floor by a force of 477 N exerted downward at an angle of 35° below the horizontal. If the coefficient of kinetic friction between the box and the floor is 0.58, how long does it take to move the box 4.20 m starting from rest?
Answer:
It takes 1.14 s to move the box 4.20 m.
Explanation:
Using Newton's second law we have:
[tex]Fcos(35)-F_{f}=ma[/tex]
[tex]Fcos(35)-\mu mg=ma[/tex]
F is the force exerted and m the mass of the books
[tex]Fcos(35)-\mu mg=ma[/tex]
[tex]477cos(35)-(0.58*315)=\frac{315}{9.81}a[/tex]
So, the books accelerate at:
[tex]a=6.48\: m/s^{2}[/tex]
We know that the initial velocity is zero, so using the kinematic position equation, we have:
[tex]x=\frac{1}{2}at^{2}[/tex]
So, we just need to solve the equation for t.
[tex]4.2=\frac{1}{2}6.48t^{2}[/tex]
[tex]t=\sqrt{\frac{2*4.2}{6.48}}[/tex]
Taking the positive value of t:
[tex]t=1.14\: s[/tex]
Therefore, it takes 1.14 s to move the box 4.20 m.
I hope it helps you!
Which type of coolant(s) usually is (are) used to remove heat from a nuclear reactor core?
a.
water only
c.
liquid sodium or water
b.
liquid sodium only
d.
CFCs
Answer:
(B). Liquid sodium or water
Explanation:
I don't know how to explain this But hope it right!
If I'm wrong I'm sorry
If I'm right Thank you and (brainliest plz)
How much mass can be lifted by a weight lifter on the surface of the moon if he can lift 100 kg on the Earth?
Answer:
if u have to find mass then it always constant everywhere that is 100kg but if u have to find weight then it 1/6 of earth .
Explanation:
16.6666
I REALLY NEED HELP THIS IS DUE IN AN HOUR
A person records a bird call as an analog wave. The sound is then stored on a computer as a digital signal. When a person wants to listen to the bird call, it needs to be converted back into an analog wave. What is an advantage of storing the bird call as a digital?
Answer:
In analog technology, a wave is recorded or used in its original form. In digital technology, the analog wave is sampled at some interval, and then turned into numbers that are stored in the digital device. On a CD, the sampling rate is 44,000 samples per second. An analog recording is considered unlimited. Therefore, it can move to a higher and higher resolution without losing its original quality.
Two examples of energy transformations are shown. At left, a floor lamp plugged into a wall electrical outlet. At right, a wood fire. The energy transformations are similar because they both involve transformations that begin with chemical energy. begin with electrical energy. result in radiant energy. result in mechanical energy.
Answer: C, result in radiant energy
Explanation:
Answer:
The answer is C; result in radiant energy.
Explanation:
Just took the test and got it right ;)
The greater the mass of an object.
Answer:
Mass is the measure of an object's matter (what it's made up of). The greater an object's mass, the greater its gravitational force. The earth has a strong attracting force for objects with smaller mass (including the moon), and the sun has an attracting force on the earth and other planets in our solar system.
Which of the following is an example of positive potential energy with reference to the floor? PLS HELP
Answer:
A
Explanation:
potential energy is usually at rest at the highest point in comparason to the ground
The colors of various main sequence stars are shown below.
Which list correctly ranks these stars in order of increasing temperature?
Answer:
The answer is B.
Barnard’s star, Sun, Altair, Achernar
Explanation:
Remember the brighter the star the higher the temperature, Red being the oldest of the stars orange middle age, white stars ( getting to its ends can be also a dwarf star), and blue star being the youngest of the stars Also blue is the hottest star
Answer:
B
Explanation:
When the comet passes close to the sun, it has a visible tail. Typically, the comet is only visible for a matter of days while it may be invisible for years. Why does the comet spend so little time close to the sun?
Answer:
The comet is locked in the Sun's gravity. as it falls deeper in the gravity we'll, its velocity increases. As is travels closer to the Sun, it is trying to break away, but cannot. This transforms into a sideways movement that produces a tight turn. It races further out of the gravity well, and sheds velocity.
Calculate the amount of charge necessary to exert a force of 35 N in an electric field of 300 N/C.
Question 6 options:
A. 0.117 C
B. 1.17 C
C. 2.12 N/C
D. 0.21 N/C
Answer:
The amount of charge is "0.117 C" i.e., option A.
Explanation:
The given values are:
Force,
[tex]\vec{F}[/tex] = 35 N
Electric field,
[tex]\vec{E}[/tex] = 300 N/C
Charge,
q = ?
As we know,
⇒ [tex]\vec{F}=q\vec{E}[/tex]
On substituting the given values in the above formula, we get
⇒ [tex]35=q\times 300[/tex]
⇒ [tex]q=\frac{35}{300}[/tex]
⇒ [tex]q=0.117 \ C[/tex]
What is the current in a circuit that has a resistance of 75Ω and a voltage drop of 120V across the cell? (I'll give brainliest!)
Resistance = (voltage) divided by (current)
= (120 V) / (0.5 Amp)
= 240 ohms .
Plz help me!!!!!!!! I will give you brainliest
explain the following observation referring to the appropriate process of heat transfer in each case
two cups of tea are poured at the same time . they are left for 10 minutes . one of the cups has a metal teaspoon left in it . the tea in this Cup is cooler than the tea in the other Cup at the end of the 10 minute period
Please answer correctly
Please help me!
Will give the brainliest!
Which planet has the least gravitational pull?
Answer:
Mercury
Explanation:
Question 29 of 43
Which is true of infrared waves?
They have shorter wavelengths than X-rays.
They give off more energy than gamma rays.
Ο Ο Ο Ο
o They have longer wavelengths than ultraviolet waves.
They have higher frequencies than visible light waves
Infrared wave basically have shorter wavelengths than X-rays. The correct option is A.
What is infrared wave?A section of the electromagnetic radiation spectrum with wavelengths ranging from roughly 700 nanometers (nm) to one millimetre is known as infrared radiation (IR), or simply infrared (mm).
While shorter than radio waves, infrared waves are longer than visible light waves.
Infrared radiation has the ability to ease muscle tension and encourage local blood circulation.
Infrared radiation has been used in conventional medicine to treat conditions including autoimmune diseases and issues with wound healing in addition to relieving muscle pain and tension.
Infrared waves are shorter than radio waves but longer than visible light waves.
Thus, the correct option is A.
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Storm water picks up pollutants off of these types of surfaces because they are not able to absorb rainfall
Answer:
True.
Explanation:
Rainwater cannot be absorbed by some surfaces. This prevents these water from infiltrating and traveling through this area, taking with it the potential pollutants that it may present, such as sediment, remains of fertilizers, bacteria, animal waste, pesticides, metals, among others. This causes a process that we can call Diffuse Pollution and can cover large areas and even bodies of water.
The density of an object can be found using
(A) Pascal's Law
(B)Hooke's Law
(C)Archimedes' Principle
(D)Principle of floatation
3.Minsoo is training for cross-country in the fall. He ran 5 miles east. Then he turned around and ran 4 miles west. Draw and label the vectors that show each segment of his trip and the resultant displacement vector. Find his resultant displacement. (10 points)
Answer:
...............................
A line with a negative slope on a distance-time graph means the object is?
Answer:negative slope or gradient I think
Explanation:
Look at the equation below. What units are used for W? Give the full name, not the symbol.
Enter your answer
W = m x g
Answer:
the watt is a unit of power
The symbol W denotes the work done and m is the mass and g is the acceleration due to gravity. If m is in Kg and g has a unit of m/s². Then the unit Kg m/s² is equal to one joule J. That is the unit of work done.
What is work done?Work done in physics is the dot product of force and displacement. Work done of one joule is equal to the force of one newton, exerted by an object of mass m and acceleration a.
Thus we have F = Ma.
If the acceleration is replaced by acceleration due to gravity g, then force of one Newton is mg, that is the product of mass and acceleration. Force is an external agent act on a body to change its state from rest or motion.
If the force applied causes a displacement of the object, then a work is done on the body. Let the mass is taken in Kg and acceleration due to gravity is in m/s², then one newton is Kg m/s² is equal to one joule J. Hence, W has the unit of Kg m/s² or J.
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any two ways to reduce sound pollution
Answer:
use earplugs
stay away from noisy areas
lower the volume
El Burj Khalifa es la torre más alta de Dubai y mide 821 m. Si se deja caer una moneda desde lo alto de la torre, ¿cuál es la magnitud de la velocidad con la que choca con el suelo?
Answer:
Vf = 126,85 m/s
Explanation:
En este caso, vamos a asumir que la velocidad inicial de la moneda cuando se deja caer es cero, puesto que no nos lo indican. Al ser la velocidad inicial cero, lo unico que influye en la velocidad de la moneda es la gravedad y la altura, por ende, la siguiente formula nos ayudará a calcularla:
Vf² = Vo² - 2gh (1)
Pero como la velocidad inicial es cero, y si también asumimos que la dirección de bajada será nuestro eje positivo, entonces:
Vf² = 2gh (2)
Ahora solo nos queda, reemplazar los valores de altura que es 821 m, y la aceleración de gravedad que es 9.8 m/s² y resolvemos la velocidad:
Vf² = 2 * 9,8 * 821
Vf = √16091,6
Vf = 126,85 m/sEsta debería ser la velocidad con que llega al suelo.
Exitos
La magnitud de la velocidad con la que choca con el suelo es aproximadamente 126.898 metros por segundo.
Si despreciamos los efectos de la viscosidad del aire y la aceleración de Coriolis, entonces el movimiento de la moneda se describe por el movimiento de caída libre, es decir, un movimiento uniforme acelerado debido a la gravedad terrestre. La velocidad final de la moneda es determinada por la siguiente ecuación cinemática:
[tex]v = \sqrt{v_{o}^{2}+2\cdot a\cdot h}[/tex] (1)
Donde:
[tex]v_{o}[/tex] - Velocidad inicial, en metros por segundo.[tex]a[/tex] - Aceleración, en metros por segundo al cuadrado.[tex]h[/tex] - Altura, en metros.[tex]v[/tex] - Velocidad final, en metros por segundo.Si sabemos que [tex]v_{o} = 0\,\frac{m}{s}[/tex], [tex]a = 9.807\,\frac{m}{s^{2}}[/tex] y [tex]h = 821\,m[/tex], entonces la velocidad final de la moneda es:
[tex]v = \sqrt{\left(0\,\frac{m}{s} \right)^{2}+2\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot (821\,m)}[/tex]
[tex]v\approx 126.898\,\frac{m}{s}[/tex]
La magnitud de la velocidad con la que choca con el suelo es aproximadamente 126.898 metros por segundo.
Invitamos cordialmente a ver esta pregunta sobre el movimiento en caída libre: https://brainly.com/question/16899214
disordered eating is often __________.
A.
an eating disorder that affects numerous teens
B.
caused by eating irregularly over short periods
C.
a precursor for developing a disorder, but not a disorder on its own
Answer:
B) caused by eating irregularly over short periods
Explanation:
Disordered eating refers to a range of irregular and unhealthy eating behaviors and attitudes toward food. Disordered eating is often C. a precursor for developing a disorder, but not a disorder on its own
Disordered eating refers to a range of irregular eating behaviors and attitudes towards food that may not meet the full diagnostic criteria for an eating disorder but still involve disturbances in eating patterns, body image, and weight. It can include behaviors such as restrictive eating, binge eating, purging, or excessive exercise.
While disordered eating shares similarities with eating disorders, it is considered a precursor or warning sign that someone may be at risk of developing a diagnosable eating disorder, such as anorexia nervosa, bulimia nervosa, or binge eating disorder. Disordered eating patterns can often progress and become more severe if left untreated, potentially leading to the development of an eating disorder.
Thereofre, disordered eating is often C. a precursor for developing a disorder, but not a disorder on its own.
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The structure of an atom consists of
A. a proton surrounded by neutrons
B. a nucleus surrounded by electrons
C. a nucleus containing protons and electrons
D. a "cloud" of protons, electrons, and neutrons
Answer:
the correct answer is C
Explanation:
a nucleus of atom is contain protons and electrons
Semi–conductors are materials that
Semi-conductors are materials that have conductivity between that of a conductor and a non-conductor (insulator).
Example: Silicon
The components of a vector are:
A:Each equal to half the magnitude of the vector.
B:Independent of the orientation of the vector.
C:Perpendicular
D:None of the previous
................produce pollen, which contains the male sex cells, or sperm.
Answer:
Anther....
My answers
3. The pressure at the bottom of the ocean is great enough to crush submarines with steel walls that are 10 centimeters thick. Suppose a submarine is at a depth of 1,000 meters. The weight of water above each square meter of the submarine is 9,800,000 newtons.
Answer:
just awnsered this one your awnser is the the second option
Answer:
answer one
Explanation:
Please help!!
A shopping bag can provide a force of 65 N before breaking. A shopper puts 5 kg of groceries in the bag. If the shopper tries to lift the bag with an upward acceleration of 2 m/s/s, will the bag break?
Answer:
the bag DOES NOT BREAK, F = 59 N
Explanation:
For this exercise, let's use Newton's second law, let's set a reference frame with the positive direction up
F -W = m a
the mass of the groceries is m = 5 kg, the weight is
W = m g
indicate the acceleration a = 2 m / s², let's find the force
F = mg + ma
F = m (g + a)
let's calculate
F = 5 (9.8 + 2)
F = 59 N
F <65 N
as the force with which it pulls the bag less than the breaking force the bag DOES NOT BREAK