Answer:
6 hours
Explanation:
Question 1 (Mandatory) (1 point)
An 8 kg basketball is dropped from a height of 10 m. Calculate the Gravitational
Potential Energy of the ball.
0784 Joules
7,683 Joules
80 Joules
O 0.8 Joules
Answer:
[tex]P.E=mgh \\ = 8kg \times 9.81m {s}^{ - 2} \times 10m = 784J[/tex]
NEED HELP!!!!!!! 13 POINTS!!!!
Alana wants to add some eccentric exercise to her routine. She has heard that pull ups are good, but she does not have a lot of upper body strength and thinks that is going to be too challenging. She wonders if she can start by just hanging on at the top with her chin above the bar and holding that pose to get the benefits. What is the BEST response to Alana?
A.
Any activity that works the arms is eccentric exercise.
B.
That might build strength, but it is not eccentric exercise.
C.
She will get all of the benefits because grasping the bar key.
D.
She needs to do something else as pull-ups are not eccentric exercise.
Answer:
the answer should be B
Explanation:
i got it right on edmentum
What is The mass of a object that has a force of 100_Newtons and acceleration of 25 m/s/s
Answer:
Yoour MOM
Explanation:
1. Define weight
2. How is the weight of an object related to its mass?
3. If an object has a mass of 50 kg, what is its weight?
Answer:
weight is the product of mass andgravitational acceleration expressed in newtons.w=mgw=mg ....w=50kg X 9.8m/s...w=490Nthermal energy is the _____ of the kinetic and potential energies of all particles in an object.
what is atmospheric pressure
Answer:
IN THE EXPLANATION!!
Explanation:
Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth.
Answer:
atmospheric pressure is the pressure exerted on the Earth's surface due to weight of air above it.
I NEED A SCIENCE EXPERT TO GIVE ME THE RIGHT ANSWERS TO THESE ASAP
Answer:
indepent valuable and random variable
Please help! Why is the air pressure lower on top of the airfoil?
Please don't answer if you don't know thanks!
Answer: When air passes both above and below the airfoil, the air on top moves faster because of the curve, causing it to have a lower air pressure. This is according to Bernoulli’s principle, which states that faster moving air has less pressure than slower moving air. Also This is what causes the airplane to lift into the air.
Explanation:
Answer:
it pulls on the air above it accelerating that air down
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Why is it important to define the coordinate system in free fall
Answer:
H = Vo t + 1/2 g t^2
Velocity and gravitational acceleration are vector quantities - it is very important to use the correct signs for these quantities to get the correct quantity for H the distance traveled.
in an electron dot diagram,the symbol for an element is used to represent
Answer:
The nucleus and all non-valence electrons.
if a velocity time graph is hortizontal then velocity is
Answer: If a velocity time graph is horizontal then the velocity is constant and there is no acceleration.
what is magnetic force?
i
Answer:
The force by which a substance (magnet) attracts a body(metals) towards it is called magnetic force
Answer:
Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. The magnetic force between two moving charges may be described as the effect exerted upon either charge by a magnetic field created by the other.
Explanation:
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A car originally at rest reaches 40m/s after accelerating for 50s. Calculate its acceleration
Explanation:
initial velocity=0
final velocity=40m/s
time=50s
acceleration=?
now,
a=v-u/t
a=40-0/50
a=40/50
a=0.8m/s^2
answer
New attempt is in progress. Some of the new entries may impact the last attempt grading. Incorrect. The hammer throw is a track-and-field event in which a 7.30-kg ball (the hammer) is whirled around in a circle several times and released. It then moves upward on the familiar curved path of projectile motion and eventually returns to the ground some distance away. The world record for the horizontal distance is 86.75 m, achieved in 1986 by Yuriy Sedykh. Ignore air resistance and the fact that the ball was released above the ground rather than at ground level. Furthermore, assume that the ball is whirled around a circle that has a radius of 2.22 m and that its velocity at the instant of release is directed 47.9° above the horizontal. Find the magnitude of the centripetal force acting on the ball just prior to the moment of release.
This question involves the concepts of centripetal force, range of projectile and projectile motion.
The magnitude of centripetal force is "2812.8 N".
First, we will find the velocity of the ball by using the formula of the range of the projectile.
[tex]R = \frac{v^2Sin2\theta}{g}[/tex]
where,
R = range of projectile = 86.75 m
v = speed = ?
θ = launch angle = 47.9°
g = acceleration due to gravity = 9.81 m/s²
Therefore,
[tex]86.75\ m = \frac{(v)^2Sin(2)(47.9^o)}{9.81\ m/s^2}\\\\v = \sqrt{\frac{(86.75\ m)(9.81\ m/s^2)}{Sin95.8^o}}[/tex]
v = 29.25 m/s
Now, we will use the formula to find out the centripetal force:
[tex]F_c = \frac{mv^2}{r}[/tex]
where,
[tex]F_c[/tex] = Centripetal Force = ?
m = mass of the ball = 7.3 kg
v = speed = 29.25 m/s
r = radius = 2.22 m
Therefore,
[tex]F_c = \frac{(7.3\ kg)(29.25\ m/s)^2}{2.22\ m}[/tex]
Fc = 2812.8 N = 2.812 KN
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an audi car advertisement states its car can accelerate from a starting velocity of rest to an ending velocity of 70m/s in 35 seconds. what is the car acceleration?
Answer:
279 m/s
Explanation:
Answer:
2m/s^2
Explanation:
A=(u-v)/t
where u=final velocity and v=initial velocity and t=time
therefore u =70 and v=0 because the question said velocity of rest and finally t=35
so, (70-0)/35= 70/35=2
How much neutrons are in the nucleus of an atom with an atomic number of 25
Answer: 13 neutrons
Explanation: They differ only because a 24Mg atom has 12 neutrons in its nucleus and a 25Mg atom has 13 neutrons.
which atmospheric layer has the lowest air pressure?
Answer:
thermosphere!!
Explanation:
thermosphere has the lowest air pressure!!
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Which is the BEST description of the role of glucose in the body?
OPTIONS:
A.
It moderates the heartbeat.
B.
It is food converted into fuel.
C.
It regulates body temperature.
D.
It eliminates sugar from the body.
PLEASE NO LINKS
The best description of the role of glucose in the body is that it is the food converted into fuel. Details about role of glucose can be found below.
What is cellular respiration?Cellular respiration is the process by which living organisms obtain energy for their daily activities by breaking down food molecules in their cells.
The food ingested by living organisms is digested into the simplest form called glucose. The glucose is then broken down during cellular respiration.
During cellular respiration, glucose is broken down to produce energy (ATP), which is the fuel for metabolic activities in the body.
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What is the relationship between the distance from the Sun and the orbital period?
P^3=a^2
P^2=Gm
P^2=a^3
T^2=P^3
Answer:
Kepler's third law - shows the relationship between the period of an objects orbit and the average distance that it is from the thing it orbits. This can be used (in its general form) for anything naturally orbiting around any other thing.
Formula: P2=ka3 where:
P = period of the orbit, measured in units of time
a = average distance of the object, measured in units of distance
k = constant, which has various values depending upon what the situation is, who P and a are measured.
This is the general form of the formula, so obviously you need at least two of the quantities to find the third. "k" is the trickiest thing since it depends upon the objects that are involved and how you measure "P" and "a". Since "P" can be measured in any unit of time (seconds, days, years, etc), and "a" can be measured in any unit of distance (meters, km, AU), the value of "k" can be quite diverse from one system to another.
There is a simplified version of this law: P2 = a3 where:
The object must be orbiting the Sun
P = period of the orbit in years
a = average distance of the object from the Sun in AU
This version is much more simple, since it has "k" = 1, so it is ignored when those units of measure are used.
is hammering wood together a physical or a chemical
Answer:
Physical
Explanation:
The physical properties of a substance change, but the identity of the substance doesn't change
according to newton’s second law, if there is a net force, there will be
Answer:
The object will have an acceleration and the object's velocity will change.
Explanation:
If there is a net force acting on an object, the object will have an acceleration and the object's velocity will change. Newton's second law states that for a particular force, the acceleration of an object is proportional to the net force and inversely proportional to the mass of the object.
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List the waves of the electromagnetic spectrum in order from Radio to Gamma waves. Be sure to also discuss what each type of wave is used for.
radio wavesAn electromagnetic wave of a frequencyAs used for long-distance Communications, microwavesMicrowaves are electromagnetic waves with wavelengths no longer than Tara Hearts wave links but relatively short for radio waves wavelength for microwaves have approximately in the range of 30 cm to1 mm, infraredHaving a wavelength greater than that of the red end of the visible light spectrum but less than the microwaves infrared radiation has a wavelength from about 800 NM to 1 mm it is emitted particular rarely my heated objects, optical Refers to electromagnetic radiation in the wavelength range between 100 NM and 1 mm the terms a light invisible radiation referred to the wavelength between 400 nm and 800 in in which can be perceived by the human eye, ultravioletThe UV region covers the wavelength range 100 to 400 in m and is divided into three brands UVA UVB and UVA CC, X-raysX-rays wavelength or shorter than the UV rays and are typically longer than those gamma rays, and gamma-rays Have the smallest wavelength and are most energy of a wave in the electromagnetic spectrum they are produced by the hottest and most energetic objects in the universe such as neutron stars and pulsars Supernova explosions and regions around black holes
Answer:
(A)
Explanation:
ITS A ok ok bye
A materiel that allows electricity to flow easily is called an
A materiel that allows electricity to flow easily is called an conductor
Which of the following accounts for most of an atom's mass?
A. The nucleus
B. Neutrons
C. Protons
D. Electrons
C.protons
Explanation:
sana makatulong :>
A monkey on a raft is crossing a river that flows to the east at 8.0m/s. His top paddling speed is 12.0m/sec. He points due south and attempts to cross. If the river is 120m wide, how far downstream will he end up when he reaches the other side?
The relation of uniform movement allows to find the result for the distance that descended when crossing the river is:
d = 180 m
Given parameters
The velocity of the river [tex]v_r[/tex] = 8.0 m / s towards the East The speed of the monkey [tex]v_m[/tex] = 12.0 m / s towards the south River width x = 120 mTo find
Distance downstream when crossing.
Velocity is a vector magnitude, it has modulus and direction, therefore vector algebra must be used.
The velocities are constant, let's use the uniform motion relation.
v = [tex]\frac{d}{t}[/tex]
In the attached we have a diagram of the movement. Let's calculate the time to cross the river.
[tex]v_r = \frac{x}{t}[/tex]
[tex]t= \frac{x}{v_r}[/tex]
t = [tex]\frac{120}{8.0}[/tex]
t = 15 s
The time is a scalar it is the same for the two movements, let's find how much it has descended in this time.
[tex]v_m = \frac{d}{t}[/tex]
d = [tex]v_m t[/tex]
d = 12.0 15
d = 180 m
In conclusion, using the uniform motion relationship we can find the result for the distance that descended when crossing the river is:
d = 180 m
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El cuerpo de 2kg se suelta de A recorriendo el plano inclinado 60° con la horizontal y de superficie lisa hasta el punto B. Luego recorre el tramo rugoso BC deteniéndose en C. Hallar “L” si se sabe que μ= 0,6.
El valor de L del tramo rugoso B a C con coeficiente de fricción igual a 0,6, recorrido por el cuerpo de 2 kg cuando se suelta del punto A es 5.00 m.
El valor de L se puede calcular a partir de la definición de trabajo:
[tex]W = F_{\mu}*d[/tex] (1)
En donde:
[tex]F_{\mu}[/tex]: es la fuerza aplicada sobre el cuerpo en el tramo de B a C = fuerza de roce = -μN (el signo menos se debe a que está en dirección opuesta a la del movimiento)
μ: es el coeficiente de roce = 0,6
N: es la normal = mg
m: es la masa del cuerpo = 2 kg
g: es la aceleración debida a la gravedad = 9,81 m/s²
d: es la distancia = L =?
Por otra parte, el trabajo también se define como la diferencia de energía mecánica entre los puntos B y C.
[tex] W = E_{C} - E_{B} [/tex] (2)
Al igualar la ecuación (1) con la (2) tenemos:
[tex]E_{C} - E_{B} = F_{\mu}*d[/tex] (3)
En el punto C, la energía es cero (0) dado que el cuerpo se detiene y en el punto B la energía que tiene el objeto es la cinética:
[tex] E_{B} = \frac{1}{2}mv_{B}^{2} [/tex]
En donde:
[tex]v_{B}[/tex]: es la velocidad del cuerpo en el punto B
La velocidad del cuerpo en el punto B se puede calcular mediante conservación de energía entre los puntos A y B:
[tex] E_{A} = E_{B} [/tex]
En el punto A, el cuerpo tiene energía potencial gravitacional, por lo tanto:
[tex] mgh = \frac{1}{2}mv_{B}^{2} [/tex] (4)
En donde:
h: es la altura = 3 m
Entonces, la velocidad en el punto B es (eq 4):
[tex] v_{B} = \sqrt{\frac{2mgh}{m}} = \sqrt{2*9,81 m/s^{2}*3 m} = 7,67 m/s [/tex]
Ahora, la ecuación (3) queda como sigue:
[tex] 0 - \frac{1}{2}mv_{B}^{2} = -\mu N*L [/tex]
[tex] \frac{1}{2}2 kg*(7.67 m/s)^{2} = 0,6*2 kg*9,81 m/s^{2}*L [/tex]
Resolviendo para L, tenemos:
[tex] L = \frac{\frac{1}{2}2 kg*(7.67 m/s)^{2}}{0,6*2 kg*9,81 m/s^{2}} = 5.00 m [/tex]
Por lo tanto, el valor de L es 5.00 m.
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Name nine elements that have been around so long that we don't even know when they
were discovered?
Nine elements that have been known since ancient times, and their discovery dates are not precisely recorded are Gold (Au), Silver (Ag), Copper (Cu), Iron (Fe), Lead (Pb), Tin (Sn), Mercury (Hg), Sulphur (S) and Carbon (C).
1. Gold (Au): Gold has been used by humans for thousands of years, with evidence of its use dating back to ancient civilizations like the Egyptians, Sumerians, and Indus Valley people.
2. Silver (Ag): Like gold, silver has a long history of human use and has been mined and utilized for various purposes since ancient times.
3. Copper (Cu): Copper is one of the oldest metals known to humans, and its use dates back over 10,000 years. It was one of the first metals to be smelted and used in tools, weapons, and art.
4. Iron (Fe): Iron is another ancient element that has been used for thousands of years. Early civilizations discovered iron in meteorites and later learned to smelt it from iron ores.
5. Lead (Pb): Lead has been known to humans since ancient times and was used by the ancient Egyptians, Greeks, and Romans. It was widely used in plumbing, as well as for making containers and pigments.
6. Tin (Sn): Tin has been used by humans for thousands of years, mainly in the form of an alloy called bronze (copper-tin alloy), which was crucial for the Bronze Age.
7. Mercury (Hg): Mercury has a long history of use in various cultures for medicinal, alchemical, and decorative purposes.
8. Sulphur (S): Sulfur has been used since ancient times for various purposes, including medicine, bleaching, and as a component in sulfuric acid production.
9. Carbon (C): While the element carbon itself has always existed on Earth, the awareness of its presence and significance as an element is ancient.
These elements were used by ancient civilizations for various purposes such as jewelry, tools, construction, and religious rituals. Their discovery dates are lost in antiquity, as they have been known to humans for thousands of years.
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Question 1 Multiple Choice Worth 2 points)
Which statement best describes the difference between strong nuclear forces and weak nuclear forces?
O Weak nuclear forces are involved when certain types of atoms break down. Strong nuclear forces are responsible for holding atoms' nucleus together
Weak nuclear forces hold bonds between atoms together. Strong nuclear forces hold together the nucleus of an atom.
O Strong nuclear bonds prevent atoms from falling apart. Weak nuclear bonds prevent compounds from falling apart.
Strong nuclear forces are involved in breaking electrons from their shells. Weak nuclear forces hold protons in the nucleus.
Answer:
Explanation:
The correct answer is: Weak nuclear forces are involved when certain types of atoms break down. Strong nuclear forces are responsible for holding atoms together.
What is the mass for both??
Answer:
ligma
Explanation:
sugondese
Diagram
atomic number: 9
mass number: 19
Fill in the blanks
with information
on a neutral
fluorine atom
À
to find the number of neutrons
in the nucleus, subtract the
atomic number from the mass
number.
# of protons:
# of neutrons:
# of electrons:
# of positive charges:
# of negative charges:
Total charge of the atom:
#valence electrons: