Answer:
Elements in the group have similar chemical properties. This is because their atoms have the same number of electron in the highest occupied energy level.
Explanation:
The Earth rotates 1 time every 24 hours….
A. How many RPM’s is this?
B. What is the velocity of a person standing on the surface of the Earth 6,378,000 m from the center?
Answer:
A. 0.000694 RPM
B. 463 m/s
Explanation:
If the scaled-up man now stands on one leg, what fraction of the tensile strength is the stress on the femur?.
The new cross sectional area and tensile stress is mathematically given as
A=4.8*10^{-4}m^2
X=14:100
Cross sectional area and stress on the femurQuestion Parameters:
To see why this must be so, recall, that the stress on the femur for a man standing on one leg is 1.4%
we scale this man up by a factor of 10 in all dimensions
that a 70 kg person has a femur with a cross-section area
a)
Generally the New cross sectional area is mathematically given as
100A=100*4.8*10^{-4}
A=4.8*10^{-4}m^2
b)
From the initial statement we see that the fraction of the tensile strength is the stress on the femur and will be
[tex]X=\frac{14}{100}[/tex]
X=14$
X=14:100
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Complete Question
Larger animals have sturdier bones than smaller animals. A mouse's skeleton is only a few percent of its body weight, compared to 16% for an elephant. To see why this must be so, recall, that the stress on the femur for a man standing on one leg is 1.4% of the bone's tensile strength. Suppose we scale this man up by a factor of 10 in all dimensions, keeping the same body proportions. (Assume that a 70 kg person has a femur with a cross-section area (of the cortical bone) of 4.8 x 10-4m², a typical value.)
Part A
Both the inside and outside diameter of the femur, the region of cortical bone, will increase by a factor of 10. What will be the new cross-section area? Express your answer using two significant figures.
Part B
If the scaled-up man now stands on one leg, what fraction of the tensile strength is the stress on the femur?
A young child holds a string attached to a balloon. What is the reaction force to the child pulling down on the string?
A. The child giggles with laughter.
B. The string pulls up on the child.
C. Gravity pulls the balloon down.
D. The balloon moves.
Answer:
The Answer Choice is C , Gravity Pulls the Balloon down
Answer:
B. may be
Explanation:
Gravity is greater than the string
pulling force.
SORRY IF MY ANSWER NEED ANY.
A source charge generates an electric field of 1236 N/C at a distance of 4 m. What is the magnitude of the source charge? (Use k=) 2. 2 µC 680 µC 2. 2 C 680 C.
Hi there!
The equation for the electric field of a point charge is given by:
[tex]E = \frac{kq}{r^2}[/tex]
E = Electric Field (N/C)
k = Coulomb's Constant
r = distance (m)
We can rearrange to solve for 'q':'
[tex]q^2 = \frac{Er^2}{k}\\\\q = \sqrt{\frac{Er^2}{k}}[/tex]
Plug in the values and solve:
[tex]q = \sqrt{\frac{(1236)(4^2)}{(8.99*10^9)}} = \boxed{0.00148 C}[/tex]
A force of 2000N pulls a load at an angle of 60degrees with the horizontal. if the weight of the object is 3000N, Calculate the coefficient of static friction.
Answer:
If one assumes that F will just start the object to move:
F = μ Wa cos θ where θ is the angle of the applied force
and Wa is the apparent weight of the object
μ = F / (Wa cos θ)
Note that Wa = W - F sin θ true weight less component of applied force
Wa = 3000 - 2000 sin 60 = 1268 N
μ = 2000 / (1/2 * 1268) = 3.15 (seems to be very large, usually < 1)
example of what happens to particles when their kinetic energy decreases?
Explanation:
When we decrease the temperature, less heat energy is supplied to the atoms, and so their average kinetic energy decreases. When they enter a phase transition, such as freezing from a liquid to a solid, the temperature is not decreasing or increasing, and stays constantAnswer:
when the kinetic energy of a particle decreases, according to me that body must have been freeze, like water particles or intermolecular force which losses when heated (gains more kinetic energy) and when freeze losses kinetic energy.
Any sound with a frequency that is too high for humans to hear is called.
Answer:ultrasound
Explanation:
A drag racer accelerates uniformly over a course 400m long. Determine the car's acceleration if it reaches a top speed of 120 m/s. Assume that the car starts from rest.
Apply third equation of kinematics
[tex]\\ \rm\hookrightarrow v^2-u^2=2as[/tex]
Isolate the equation for a
[tex]\\ \rm\hookrightarrow a=\dfrac{v^2-u^2}{2s}[/tex]
[tex]\\ \rm\hookrightarrow a=\dfrac{v^2}{2s}[/tex]
[tex]\\ \rm\hookrightarrow a=120^2/800[/tex]
[tex]\\ \rm\hookrightarrow a=18m/s^2[/tex]
Which of the following statements is incorrect about the relationship between force,
acceleration, and mass?
a. A small force results in a larger acceleration.
b. An object with greater mass will have smaller acceleration.
c. More force is needed to accelerate an object with a larger mass.
d. A small force results
a small acceleration.
Answer:
A
Explanation:
a small force results in a large acceleration
7
Analisa wants to save her money in a place where she can have access to it anytime in case of an emergency. Which option BEST fits Analisa's
wishes?
OA.
CD
ОВ.
savings account
Ос.
bond
OD. stocks
Savings account is where she can have access to her money anytime in case of an emergency.
What is a Savings account?This is a type of account run by a financial institution which yields interests on deposits made.
This type of account usually comes with features in which the money can be withdrawn via an ATM card or by visiting the bank to collect it. This therefore makes it the most appropriate choice for Analisa.
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What type of radiation can be stopped by a approximately 5 cm of air.
Donna jogs to work, a distance of 3 km, at an
average speed of 8 km/h. If she leaves home at
8:00am, at what time will she arrive at work?
explanation
we take distance covered divided by speed
=3/8
=0.375h
=22min
time =8.00+0.22
=8.22am
A rope hangs over a frictionless pulley attached to the ceiling. A weight is attached to each end of the rope. One end of the rope has 10 kg weight, the other has a 20 kg weight. The system consists of: the pulley, rope, the two weights, and Earth. Initially the weights are suspended at the same height above the ground. When the weights are released, the heavier weight falls, lifting up the lighter weight. Movement stops when the heavier weight reaches the floor.
Which choice best describes the changes in kinetic and potential energy?
At the moment when the movement stops, the lighter object has zero kinetic energy and maximum potential energy while the heavier object has maximum kinetic energy and zero potential energy.
Conservation of mechanical energy
The principle of conservation of mechanical energy states that the total mechanical energy of isolated system is always constant.
M.A = P.E + K.E
where;
P.E is the potential energyK.E is the kinetic energyTherefore, at the moment when the movement stops, the lighter object has zero kinetic energy and maximum potential energy while the heavier object has maximum kinetic energy and zero potential energy.
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A 10-kg object weighs nearly 100 N on Earth. Would it weigh more or less on the Mars? Wouldits mass will be different on the Moon?
Answer:
less
Explanation:
weight = mass * acceleration due to gravity----(1)
the acceleration due to gravity on Mars is less than on earth. From equation (1 )we can say that weight in Mars is less than earth.
During a baseball game, a batter hits a high pop-up. if the ball remains in the air for a total of 6.0 s, how high does it rise? ( Assume Accel. = 10 m/s^2 )
Apply second equation of kinematics
[tex]\\ \rm\hookrightarrow s=ut+\dfrac{1}{2}gt^2[/tex]
[tex]\\ \rm\hookrightarrow s=1/2(10)(3)^2[/tex]
[tex]\\ \rm\hookrightarrow s=5(9)[/tex]
[tex]\\ \rm\hookrightarrow s=45m[/tex]
It rises 45m
You observe a star system for many weeks. The light curve does not show significant changes in brightness, but a series of spectra show a spectral feature that cyclically appears as one absorption line, then two, then one again, and so on. Is this a binary system
Based on the changes in the light curve and the behavior of the series of spectra, this is a binary system.
How is this is binary system?The characteristics described are those of a binary system with the specific type of system being the spectroscopic binary system.
This is because in a spectroscopic binary system, there won't be significant changes in brightness but as a result of stars orbiting towards and then away from us, spectral features will appear as alternative absorption lines.
In conclusion, this is a binary system.
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E) Would you expect the temperature of the water to continue rising above 20°C? Explain your answer.
Answer:
No, when water converts to steam on heating, the temperature remains constant at the boiling point and the heat supplied to the water is used for the vaporisation of water, rather than increasing the temperature of water.
This energy used for the vaporisation is termed as the latent heat of vaporisation.
You’ll find similar observations if you try heating ice - the temperature remains at 0∘ Celsius. Here, it’s the latent heat of fusion.
You are part of a police unit that has found a powder in a suspect's home. You think it might be a new drug called XYZ. XYZ is an ionic compound that dissolves in water. However, what you think might be a drug may just be salt. Unfortunately there seems to be iron fillings and sand mixed in with the white powder. Your job is to isolate the white powder before sending it to the police lab to be tested to determine if it is salt or XYZ. Give step by step directions on exactly how you will separate your mixture of white powder, iron fillings, and sand.
Answer:
a magnet and sifter
Explanation:
a magnet will get all the iron filling and the sifter will separate the powder and sand
Post WWII Germany was divided into four zones with the Americans occupying one zone and all of the following countries occupying a zone EXCEPT:
a. USSR
c. France
b. Italy
d. England
Answer:
b. Italy
Explanation:
Italy had sided with germany and lost in world war 2
After the Potsdam conference, Germany was divided into four occupied zones: Great Britain in the northwest, France in the southwest, the United States in the south and the Soviet Union in the east.
europeuncedu
The largest source of background radiation is
The largest source of background radiation is radon
kon'nichiwa~
please help me with this question!!
Let's check the relationship
[tex]\\ \rm\hookrightarrow g=\dfrac{GM}{r^2}[/tex]
[tex]\\ \rm\hookrightarrow g\propto G[/tex]
So
Raindrops will fall faster . .Also walking on ground would become more difficult as g increases.Option C is wrong by now .Let's check D once
[tex]\\ \rm\hookrightarrow T\propto \dfrac{1}{\sqrt{g}}[/tex]
So time period of simple pendulum would decrease.When two objects of unequal masses collide with no other external forces, what happens to the momentum within the system?
Diamonds are a very dense material. Predict what would happen to the light ray if you projected it from air through a diamond
Answer:
It [the diamond] would act like a prism, and make a rainbow, or, the light would break up and disappear
Explanation:
that's what I would think at least
Answer:
a cat could eat it
Explanation:
Fluffy ate my diamond
Why are some solutions better conductors of electricity.
Answer:
Strong electrolytes have a better tendency to supply ions to the aqueous solution than weak electrolytes.
Explanation:
Calculate the amount of conventional current flowing in the wire. The measurement was made at a location where the horizontal component of the earth's magnetic field is bearth 2 ✕ 10-5 tesla.
It can be deduced that the amount of conventional current that is flowing in the wire is 0.1608 A.
What is a conventional current?
The conventional current simply means the charge per unit time that is transported in a certain direction.
In this case, the magnetic field B of the wire makes an angle θ with the earth's magnetic field BEarth. From the tangent law of magnetism,
B = BEarth × tanθ
= (2 × 10 - 5T) × tan15 = 5.36 × 10-6 T
The current flowing through the wire will be:
I = 2πrB / μ0
I = 2π × (6 × 10-3m)(5.36 × 10-6 T) / (4π × 10 - 7)
I = 0.1608 A
Therefore, the amount of conventional current that is flowing in the wire is 0.1608 A.
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22. True or False... The original unstable isotope is the daughter isotope.
Answer:
false
Explanation:
Electric fields are usually created when _____ are transferred between objects? *.
Answer:
electrons
Explanation:
Electric fields are usually created when electrons are transferred between objects?
Angular Quantities: When a fan is turned off, its angular speed decreases from 10 rad/s to 6.3 rad/s in 5.0 s. What is the magnitude of the average angular acceleration of the fan
Answer:
angular acceleration = change in angular speed / change in time
angular acceleration = 10 rad/s - 6.3 rad/s / 5s
angular acceleration = 3.7 rad/s / 5s
angular acceleration = 0.74 rad/s^2
1) A 2-kg object moving at 10 m/s has a 4-N force applied to it. Can you predict how the force will affect the object?
es
A) yes, it will slow it down at a rate of 2 m/s?
B) yes, it will speed it up at a rate of 2 m/s
yes, it will speed it up at a rate of 4 m/s?
D) It cannot be determined without more information,
아
Hint
Regular Calc
Graphing Calc
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Answer:D) It cannot be determined without more information,
Explanation:
How does forces affect the acceleration of a body
