Answer:
f = 0.75 Hz
Explanation:
It is given that, a person is kicking there legs three times every four seconds. We need to find his frequency. The number of times an event is occurring is called frequency of an object. The frequency of a person is given by :
[tex]f=\dfrac{n}{T}\\\\f=\dfrac{3}{4}\\\\f=0.75\ Hz[/tex]
So, the frequency of the person is 0.75 Hz.
A team of bicyclists are on bikes that require 512 J of work to ride. It takes 432 J of work for the bike to turn the gears. What is the mechanical efficiency of the bike?
Answer:
84.4 %
Explanation:
Mechanical efficiency = output work/input work × 100 %
output work = 432 J of work for the bike to turn the gears
input work = 512 J of work to ride.
Mechanical efficiency = 432 J/512 J × 100 %
= 0.844 × 100%
= 84.4 %
Electrical conductivity in liquid solutions depends on the presence of free
Answer:
electrical conductivity in liquid solutions depends on the availability of free ions.
lighting converts ... energy, into ... energy.
Explanation:
lighting converts heat energy.
hope you like this .
Alexander calder's mobiles are an example of _________ motion because it uses forces of wind and water.
Answer:
It is an example of kinetic art motion
Explanation:
Alexander caders's mobile was made by an American sculptor called Alexander Cader. He made innovative kinetic mobile sculptures that use that uses motor or air currents.
Alexander caders's mobile is a kinetic sculptures because movement is it's basics. The sculptures is well moved by air currents. The Alexander cader mobiles make movement as integral part of the design of the sculpture.
what is the frequency of an ocean wave that is traveling at a speed of 45 m/s if it has a wavelength of 3 meters.
please show work
Answer:
The frequency of an ocean wave is 15 Hz.
Explanation:
We are given with, the speed of an ocean wave is 45 m/s. Its wavelength is 3 m
It is required to find the frequency of an ocean wave.
The speed of a wave is given in terms of frequency and wavelength as :
[tex]v=f\lambda[/tex],
f = frequency of ocean wave
[tex]f=\dfrac{v}{\lambda}\\\\f=\dfrac{45}{3}\\\\f=15\ Hz[/tex]
So, the frequency of an ocean wave is 15 Hz.
if a 10 kg object has a kinetic energy of 20 J what is its speed and what is the formula used to calculate speed
Answer:
2 meter per second
Explanation:
kinetic energy = 1/2 m v^2
20J = 1/2 × 10 × v^2
v^2 = 4
v= 2 m/s
why is the term impulsive of force coined
Answer: Impulse of force is a process of reducing and minimizing the impact of force on the object.
Explanation:
If an impact stops the moving object then the change in momentum will become a fixed quantity, extending the time of collision and reducing the time of impact.
For example, If a person jumps to the ground with a certain height the person will bend knees to extend the time of collision while hitting the ground and reducing the time of impact to prevent much injury.
If the distance is halved and the charges of both particles are doubled, the force is ________ as great.
Answer:
The new force is 16 times of the initial force.
Explanation:
The electric force between charges is given by :
[tex]F=\dfrac{kq_1q_2}{r^2}[/tex]
If the distance is halved, d' =d/2 and charges are doubles, [tex]q_1'=2q_1\ \text{and}\ q_2'=2q_2[/tex]
New force becomes,
[tex]F'=\dfrac{kq_1'q_2'}{r'^2}\\\\F'=\dfrac{k(2q_1)(2q_2)}{(d/2)^2}\\\\F'=16\times \dfrac{kq_1q_2}{r^2}\\\\F'=16F[/tex]
So, the new force is 16 times of the initial force.
If the distance is halved and the charges of both particles are doubled, the force is 16 times as great.
Coulomb's LawAccording to Coulomb's law, the electrostatic force between two charges is given by;
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
Where 'k' is the Coulomb's constant.
If the charges of both particles are doubled and the distance is halved, the new force will be;
[tex]F\,'=k\frac{2q_1 \times 2q_2}{(r/2)^2}=k \frac{4\times 4\times q_1 q_2}{r^2} =16\,F[/tex]
So, the new force will be 16 times greater than the old force.
Learn more about Coulomb's law here:
https://brainly.com/question/14049417
I need an answer ASAP, so if anyone can help right away that would be amazing!
A current-carrying wire with many loops is called
a magnetic field.
a wire coil.
a solenoid.
a bar magnet.
Answer: Solenoid
Explanation:
Answer:
Solenoid
Explanation:
Water waves and light waves are both examples to
Answer:
Transverse waves
Explanation:
Transverse waves are a type of wave that oscillates perpendicular to the direction of movement (the direction of propagation). These type of waves are usually represented by the sine or cosine functions due to the up and down oscillation of the waves.
In the case of water waves the thing that oscillates up and down are the water particles affected by the disturbance.
And for the case light waves what oscillates are the electric and magnetic fields, both oscillating perpendicular to the direction of light propagation.
dunno the answer.. ¯\_(ツ)_/¯
What information can you infer from the Lewis structure diagram shown below?
A. Boron has six valence electrons.
B. Oxygen has six valence electrons.
C. Boron has five valence electrons.
D. Oxygen has five valence electrons.
Answer:
B
Explanation:
The picture shows 'O' for oxygen and is surrounded by six dots that represent valence electrons.
PLEASE HELP
GREATLY APPRECIATED IF YOU DO
Answer:
a. 38400j
Explanation:
p= mgh
2400×10×1.6
A rock is rolling down a hill, and it’s halfway down. Would it have both Kintectic engery and Potenial engery? PLEASE HELP
Answer:
Only kinetic.
Explanation:
Potential energy means it has the potential to move. Not something already in motion.
Answer:
yes
Explanation:
it hasn't stopped moving so it still has kinetic energy and it hasn't reached what is considered 0 so yes it has both potential and kinetic energy
if you need more of an explanation let me know and ill fix it
Elias serves a volleyball at a velocity of 16 m/s. The mass of the volleyball is 0.27 kg. What is the height of the volleyball above the gym floor if its total mechanical energy is 41.70 J? Round to the nearest tenth. m
Answer:
The correct answer to the following question will be "2.7 m".
Explanation:
The given values are:
Velocity, v = 16 m/s
mass, m = 0.27 kg
Mechanical energy, M.E = 41.70 J
g = 9.8 m/s²
As we know,
Kinetic energy, [tex]K=\frac{mv^2}{2}[/tex]
Potential energy, [tex]U=m.g.h[/tex]
Now, the total mechanical energy will be:
⇒ [tex]\frac{mv^2}{2}+U[/tex]
⇒ [tex]41,71 \ kg.m^2/s^2[/tex]
Now,
⇒ [tex]h=\frac{E-(\frac{mv^2}{2})}{mg}[/tex]
On putting the estimated values, we get
⇒ [tex]=\frac{41.70-(\frac{0.27(16)^2}{2})}{0.27\times 9.8}[/tex]
⇒ [tex]=\frac{41.70-(\frac{0.27\times 256}{2} )}{2.64}[/tex]
⇒ [tex]=\frac{41.70-34.56}{2.64}[/tex]
⇒ [tex]=\frac{7.14}{2.64}[/tex]
⇒ [tex]=2.7 \ m[/tex]
Answer:
2.7 m
Explanation:
On the moon, the acceleration of gravity is 1.6 m/s2. If an object has a
mass on Earth of 5.1 kg, what is its mass on the moon?
Answer:
5.1 kg
Explanation:
Its mass on the moon is 5.1 kg because mass is an intrinsic property of a material and does not change with location. Although, its weight might vary because its acceleration of gravity g is dependent on the mass M and radius r of the planet(in this case, moon) involved g = GM/r². Since weight W = mg is dependent o g, weight varies but mass remains constant.
Write a statement about your understanding of how momentum is conserved during a collision
Sunidhi made a study chart about changes in states of
matter.
Which headings best complete the chart?
X
melting
sublimation
Y
freezing
deposition
X: Solid Directly to Liquid
Y: Liquid Directly to Solid
OX: Liquid Directly to Solid
Y: Solid Directly to Liquid
O X: Heat Is Released
Y: Heat Is Absorbed
X: Heat Is Absorbed
Y: Heat Is Released
Answer:
freezing melting sublimating x y
x and
Explanation:
To drop a table of states of matter the best headings must be
table name: matter state
freezing melting sublimation x y
This order goes from the solid state to the gaseous state, which is obtained by introducing heat into the system
Answer: D on edge
X: Heat Is Absorbed
Y: Heat Is Released
Explanation:
sublimation and melting are both absorbing heat(aka getting warmer)as they change state while freezing and deposition are releasing heat(aka getting colder)as they change state
Se coloca una piedra de 600 g en una Honda de 50 cm y se la hace girar a una velocidad de 4 m/s. Dibuja la fuerza que ejerce la honda y calcula su módulo. ¿cómo afecta el peso a este caló? ¿Y su masa?
Answer:
Fc = 19.2 N
Explanation:
In this case, the force of the Honda over the rock, is a centripetal force. Then, you have:
[tex]F_c=m\frac{v^2}{r}[/tex]
m: mass of the rock = 600g = 0.6 kg
v: tangential velocity of the Honda = 4m/s
r: radius of the Honda = 50cm = 0.5m
You replace the values of m, r and v in the equation for Fc:
[tex]F_c=(0.6kg)\frac{(4m/s)^2}{0.5m}\\\\F_c=19.2N[/tex]
hence, the force has a magnitude of 19.2 N
If the rock would have more mass the centripetal force would be higher
When asked to name all the forces on a marker sitting in equilibrium on a desk, a student responds: “Since the marker on the desk is at rest, there are no forces
acting on it.” Why is this wrong? How would you restate it?
Answer:
The forces acting on the pen which is still on the table can have two forces acting on them. The forces are gravitational force and the equal and opposite force to the gravitational forces.
The equal and opposite forces that is applied on the pen keeps the pen still on the table.
So, the statement that no force is applied on the pen which is kept still on the table is wrong as two forces are applied on the pen.
As both the forces are equal and opposite so it is cancelled and is still.
24
Fig. 24.1 shows a liquid dropper used to draw a liquid from a bottle of
medicine. The squeeze bulb of the dropper is squeezed and then released
so that liquid from the bottle is sucked up into the tube of the dropper.
Explain how difference in air pressure enables liquid to be drawn into the
tube of the dropper.
Answer: It is due to the low air pressure in the stopper and the atmospheric pressure.
Explanation: Whenever is there is a pressure, there must be a force exerted. Because,
Pressure = Force/ Area
So, when the bulb of the dropper is squeezed, the air pressure inside the dropper decreases because all the air is forced out.
When the dropper is placed in a liquid and the squeezed bulb is released, the air pressure outside the stopper surrounding the liquid becomes high and forces the liquid inside the dropper.
The rise of the liquid into the stopper is due to the atmospheric pressure.
This is similar to drinking liquids using a straw.
The sputnik one satellite orbiting earth mass equals 5.98×10 to the 24th power kilograms in a circle of radius 6.96×10 to the six power meters what was its orbital velocity
Answer:
7572 m/s
Explanation:
The force between two masses separated by a distance r is given as:
[tex]F=G\frac{m_1m_2}{r^2}[/tex]
Where F is the attractive force between 2 masses, m1 and m2, r is the distance between the centres of the masses and G is the universal gravitation constant, which is [tex]6.674*10^-11 Nm^2/kg^2[/tex]
The mass of the earth ([tex]m_1[/tex]) is far greater than the mass of the sputnik ([tex]m_2[/tex]). Therefore [tex]m_1m_2=m_1[/tex]. The mass of the sputnik is neglected, therefore:
[tex]F=G\frac{m_1}{r^2}=\frac{(6.674*10^{-11})(5.98*10^{24})}{(6.96*10^6)^2} = 8.2389N[/tex]
But F is actually centripetal acceleration, a = v²/r
[tex]8.2389 = v^2 / 6.96*10^6\\v=7572m/s[/tex]
What is the SI unit used to measure force?
Newton
Meter
Pascal
Joule
Answer:
newton(N)
Explanation:
what is most often given a value of zero to describe an object position on a srtaight line
Answer: A. Reference point
Explanation: A reference point is usually the start of a location, and if it's a starting point, then it will be 0.
Have a nice day. :)
Sobre un velero actúa la fuerza del motor de 900 N y perpendicularmente a ella, la del viento de 750 N. Si se mueve con MRU, ¿qué fuerza de rozamiento actúa sobre el barco?
Answer:
[tex]F=F_{f}=1171.5 N[/tex]
Explanation:
We know that the sailboat has a uniform movement, therefore the total force, the engine, and the wind must be equal to the friction force.
[tex]F=F_{f}[/tex]
[tex]F=F_{f}=\sqrt{F^{2}_{engine}+F^{2}_{wind}}[/tex]
[tex]F=F_{f}=\sqrt{900^{2}+750^{2}}[/tex]
[tex]F=F_{f}=1171.5 N[/tex]
Therefore the friction force is 1171.5 N.
I hope it helps you!
Электролиз продолжался 4 часа, при этом на катоде выделилось 16 g серебра. Электрохимический эквивалент серебра 1,118 mg/C. Чему равна сила тока (А) электролиза?
Answer:
Сила тока 0.994 А
Explanation:
Параметры приведены ниже;
Время = 4 часа = 14 400 с
Масса выпущенного серебра = 16 г
Электрохимический эквивалент серебра = 1,118 мг / с
Формула для количества электричества Q дается следующим образом;
Q = I × t
Куда;
I = ток (A)
t = время в секундах, с
Масса m, образующаяся при электролизе, определяется соотношением;
[tex]m = E_c \times Q = E_c \times I \times t[/tex]
Куда;
[tex]E_c[/tex] = Электрохимический эквивалент серебра = 1,118 мг / с
м = 16 г
Подставляя значения, мы имеем;
Который дает;
[tex]I = \dfrac{16}{1.118 \times 10^{-3} \times 14,400} = 0.994 \, A[/tex]
Следовательно, сила тока = 0,994 А.
6. A 2.2 kg rock rests on the edge of a bridge that is 3.3 m above a river. What is the
gravitational potential energy of the rock when measured from the surface of the
river? What is the gravitational potential energy when measured from the edge of
the bridge?
Answer: 71 J
Explanation: The formula for gravitational potential energy is Epg= mgh.
So you plug in 2.2 as m, 3.3 as h and 9.81 as g. Once you do that you should get an answer of 71.2206. But because there are only two significant digits in the question, your answer must also have two significant digits.
The gravitational potential energy of the rock of 2.2 kg that is 3.3 m above the river is 71 J. The potential energy of the rock when measured from the edge of the bridge is zero where because rock is resting in the edge itself , so height will be zero.
What is gravitational potential energy ?Potential energy of an object is the energy generated by virtue of its position. Thus the energy is stored on the object when it rest. The energy stored on it when it is in a gravitational field is called its gravitational potential energy.
The gravitational potential energy of an object is given as follows;
p = mgh
where h is the height from the surface.
Given mass of the rock, m = 2.2 Kg
height = 3.3 m
g = 9.8 m/s²
then, p = 2.2 kg × 3.3 m × 9.8 m/s² = 71 J.
Therefore, the gravitational potential energy of the rock is 71 J.
Find more on potential energy:
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If an object is thrown up at an initial velocity of 9.8 m/s, how long will it take to fall back to the ground?
PLEASE HELP ME!
Which statement is NOT true about direct proportion?
A. direct proportion is a type of relationship between two variables
B. when one variable doubles, the other quadruples
C. when one variable doubles, the other doubles too
D. when one variable is zero, the other is also zero
Answer:
d
Explanation:
when one variables is zero ,the other is also zero
what is electrostatic force eg
Answer:
electrostactic force mean a force exerted from a charged object
eg :- a charged comb
Explanation:
hope this helps u stay safe
Explanation:
electrostatic force is the force that exist between electrically charged particle object at rest .
example of electrostatic force :- when we run a piece of paper with the oil in our head with the help of comb produced electrostatic force.
A 7.12 μC charge is moving at the speed of light in a magnetic field of 4.02 mT. What is the force on the charge?
Answer:
858.7 N
Explanation:
The magnetic force on the charge F = Bqv where B = magnetic field strength = 4.02 mT = 4.02 × 10⁻³ T, q = charge = 7.12 μC = 7.12 × 10⁻⁶ C and v = c = speed of light = 3 × 10⁸ m/s
F = Bqc
= 4.02 × 10⁻³ T × 7.12 × 10⁻⁶ C × 3 × 10⁸ m/s
= 858.7 N