Answer:
its d
Explanation:
i did itand it was d
How much force required to prevent a book from falling if the mass of the book is 50 grams?
Answer:
The gravitational force on a mass is its weight. We can write this in vector form, where
→
w
is weight and m is mass, as
→
w
=
m
→
g
.
In scalar form, we can write
w
=
m
g
.
Since
g
=
9.80
m/s
2
on Earth, the weight of a 1.00-kg object on Earth is 9.80 N:
w
=
m
g
=
(
1.00
kg
)
(
9.80
m/s
2
)
=
9.80
N
Explanation:
To what height, h, would the pendulum bob rise after a single swing if it was being released from the height of 0.80 m
Answer:
0.80 m
Explanation:
Neglecting friction, the total mechanical energy of the pendulum is constant.
E = K + U where K = kinetic energy and U = potential energy.
At its release point of 0.80 m, the pendulum bob has a mechanical energy which is equal to its potential energy, since, its initial kinetic energy is zero. By the time the bob swings to the other end, it has a mechanical energy equal to it initial potential energy since total energy is conserved.
Neglecting friction, the pendulum bob would swing back to its original height of 0.80 m since the total mechanical energy is conserved and at its highest point, it is purely potential energy.
So, the height the pendulum bob swings to after release from a height of 0.80 m neglecting fiction is 0.80 m.
A uniform bridge span of weight 1200 kN and of
length 17.0 m rests on a support of width 1.0 m at
either end. A stationary lorry of weight 60 kN is the
only object on the bridge. Its centre of mass is 3.0m
from the centre of the bridge.
15.0 m
A crate of mass 5 kg is pushed along a rough horizontal surface by a constant horizontal force of magnitude 40 N. The speed of the crate increases from 1 ms⁻¹ to 4 ms⁻¹ in a time of 2 seconds. a) Calculate the magnitude of the acceleration of the crate. b) The magnitude of the frictional force between the crate and the surface.
a) To calculate the magnitude of the acceleration of the crate, we can use the formula:
acceleration = (change in velocity) / time The change in velocity is given as 4 m/s - 1 m/s = 3 m/s, and the time is given as 2 seconds. Plugging these values into the formula, we have: acceleration = (3 m/s) / (2 s) = 1.5 m/s² So, the magnitude of the acceleration of the crate is 1.5 m/s². b) To find the magnitude of the frictional force between the crate and the surface, we can use Newton's second law: frictional force = mass * acceleration The mass of the crate is given as 5 kg, and the acceleration is 1.5 m/s² (from part a). Plugging these values into the formula, we have: frictional force = (5 kg) * (1.5 m/s²) = 7.5 N So, the magnitude of the frictional force between the crate and the surface is 7.5 N.
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What name do we give to the kind of energy associated with random agitation at the microscopic level? A. Source energy B. Chemical energy C. Thermal energy D. Elastic energy
The name do we give to the kind of energy associated with random agitation at the microscopic level is called C. Thermal energy.
Thermal energy is the total energy of all the particles in a system. It is a form of kinetic energy and is transferred from one body to another in the form of heat. The random agitation at the microscopic level is caused by the movement of these particles, which is what gives rise to thermal energy.
In contrast, source energy is the energy that is used to produce electricity, chemical energy is the energy stored in chemical bonds, and elastic energy is the energy stored in a stretched or compressed object. I hope this helps! Let me know if you have any further questions.
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What is the difference between physical and chemical changes?
Answer:
A
Explanation:
Chemical is a reaction between 2 things signs of that would be a new color, a new substance formed, or any sign of bubbles/smoke etc. while physical changes are done on purpose such as ripping a paper or cutting a log in half! hope that helped
If a circuit has a power of 50 W with a current of 4.5 A, what is the resistance in the circuit?
Answer:
\({ \rm{power, \: p = current \times p.d}} \\ { \rm{50 = 4.5 \times (current \times resistance)}} \\ { \rm{50 = 4.5 \times (4.5 \times r)}} \\ { \rm{resistance = \frac{50}{ {4.5}^{2} } }} \\ \\ { \rm{resistance = 2.5 \: ohms}}\)
You went on a trip to Europe and got many fridge magnets. Upon reaching home, you started taking out the magnets and putting them on the fridge. However, the magnets were not attaching to the fridge. What could be the reason behind this?
Please help me I have to redo this this tommorow
Answer:
Explanation:
There could be several reasons why the fridge magnets are not attaching to the fridge. Here are a few possible explanations:
Material: The magnets you purchased might not be made of a magnetic material. Some souvenirs may look like magnets but are only decorative and lack the magnetic properties required to stick to metal surfaces like a fridge.
Magnetic strength: The magnets you bought may have weak magnetic strength, making them unable to attach to the fridge. Magnets vary in their strength, and if the ones you have are not powerful enough, they may not adhere to the fridge's surface.
Fridge surface: The surface of your fridge may not be magnetic. While many fridges have magnetic surfaces, some newer models or specialized fridges may have non-magnetic materials, such as stainless steel or plastic, which won't hold magnets.
Protective coating: If your fridge has a protective coating or a layer of paint, it might interfere with the magnetic force. The magnets need direct contact with the metal surface to adhere, and any barrier between the magnet and the fridge can prevent attachment.
Incorrect positioning: It's also possible that you are not placing the magnets correctly on the fridge. Make sure you are placing them on a flat, smooth surface without any obstructions or unevenness that could prevent proper contact.
Dirty or greasy surface: If the surface of your fridge is dirty, greasy, or covered with dust, it can create a barrier between the magnet and the fridge, making it difficult for them to stick. Clean the surface with a mild detergent or cleaner to remove any dirt or grease.
It's worth noting that the effectiveness of fridge magnets can vary, and sometimes a combination of factors can contribute to them not sticking. If none of the above reasons seem to apply, it may be necessary to consider alternative options or consult the manufacturer of the fridge for more information.
what is the density rhoh of hot air inside the balloon? assume that this density is uniform throughout the balloon. express the density in terms of th , tc , and rhoc .
The density (ρh) of hot air inside the balloon, assuming it is uniform throughout, can be expressed in terms of Th, Tc and ρc (density of surrounding air) using the ideal gas law as follows: ρh = (ρc * Tc) / Th
The ideal gas law states that for a given amount of gas, the product of its pressure (P) and volume (V) is proportional to the product of its temperature (T) and the number of moles (n). Mathematically, it can be expressed as:
PV = nRT
Where R is the ideal gas constant.
Since we are considering a balloon filled with hot air, the pressure and volume inside the balloon remain constant. Therefore, we can modify the ideal gas law to relate the densities of hot air (ρh) and surrounding air (ρc) to their respective temperatures:
(ρh * V) / Th = (ρc * V) / Tc
Here, V represents the volume of the balloon, which cancels out on both sides of the equation.
Simplifying the equation:
ρh / Th = ρc / Tc
Rearranging the equation to solve for ρh:
ρh = (ρc * Tc) / Th
The density (ρh) of hot air inside the balloon, assuming it is uniform throughout, can be calculated using the ideal gas law. The expression for ρh in terms of Th (temperature of hot air), Tc (temperature of surrounding air), and ρc (density of surrounding air) is given as: ρh = (ρc * Tc) / Th.
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A vector is 14.4 m long and
points in a 133 degree
direction.
Find the x-component of the
vector.
X-component (m)
Answer:
Explanation:
The x-component is found in the magnitude of the vector times the cosine of the angle.
\(A_x=14.4cos133\) and, to 3 sig dig,
\(A_x=-9.82m\)
which is one characteristic of an electron?
Answer:
The electron is a negatively charged particle found in the atoms of all the elements. The electrons are located outside the nucleus in an atom. An electron is usually represented by the symbol (e –). The mass of an electron is about the mass of a hydrogen atom.
Explanation:
consider a pipe 45.0 cm long if the pipe is open at both ends. use v=344m/s.
Consider a pipe 45.0 cm long that is open at both ends, and use v=344 m/s for the speed of sound.
1. First, convert the length of the pipe from centimeters to meters: 45.0 cm = 0.45 m.
2. The fundamental frequency for an open pipe can be found using the formula: f1 = v / (2 * L), where f1 is the fundamental frequency, v is the speed of sound, and L is the length of the pipe.
3. Plug the values into the formula: f1 = 344 m/s / (2 * 0.45 m).
4. Calculate the fundamental frequency: f1 = 344 m/s / 0.9 m = 382.22 Hz.
So, for a 45.0 cm long pipe open at both ends with a speed of sound at 344 m/s, the fundamental frequency is 382.22 Hz.
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A block is hung by two ropes angled at 30º and 60º respectively. What is the ratio of the tension in the second rope to the tension in the first rope?
Will most likely cause the formation of a Mountain
A. Divergent boundary
B. Convergent boundary
C. Transform boundary
Answer:
Convergent boundaries. When two plates collide and one is pushed over the other, forming a mountain.
A skipper on a boat notices wave crests passing his anchor chain every 5.6 s . He estimates the distance between wave crests to be 16 m . He also correctly estimates the speed of the waves. Find this speed.
Answer:
v = 2.85 m/s
Explanation:
Given that,
A skipper on a boat notices wave crests passing his anchor chain every 5.6 s.
The distance between wave crests to be 16 m.
We need to find the speed of the waves. The speed of a wave can be calculated by the formula as follows :
\(v=f\lambda\\\\v=\dfrac{\lambda}{T}\\\\v=\dfrac{16}{5.6}\\\\v=2.85\ m/s\)
So, the speed of the wave is 2.85 m/s.
If the initial height of the ball is 0.90 m above the ground, how far does it travel in the horizontal direction before landing
The horizontal distance travelled by the ball before landing is called the range of the projectile. So, we are required to calculate the range of the projectile gravity
Now, we know that, the time taken by the projectile to fall on the ground is given by the formula :`t=sqrt(2h/g)`Where,h = Initial height of the projectileg = acceleration due to gravity Now, using the given values, we get :`t=sqrt(2×0.9/9.8)`= 0.3 seconds Now, we know that,Range of projectile = horizontal velocity × time takenTherefore, the horizontal velocity of the projectile is 8 m/s.Now, using the calculated value of time, we can calculate the range of the projectile.Range of projectile = horizontal velocity × time takenRange of projectile = 8 m/s × 0.3 s = 2.4
The horizontal distance travelled by the ball before landing is called the range of the projectile.Now, we know that, the time taken by the projectile to fall on the ground is given by the formula :`t=sqrt(2h/g)`Where,h = Initial height of the projectileg = acceleration due to gravity Now, using the given values, we get :`t=sqrt(2×0.9/9.8)`= 0.3 secondsNow, we know that,Range of projectile = horizontal velocity × time takenNow, we need to calculate the horizontal velocity of the projectile. As the horizontal component of velocity is always constant and equal to its initial value, i.e., 8 m/s
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Question 1
1 points)
Will any two objects dropped from the same height hit the ground at the same time if air resistance is not a
factor?
A) scientific
B) non-scientific
The specific heat capacity of water is 4.184 J/(g.˚C). How much thermal energy is required to change the temperature of 700.0g of water from 25.6˚C to 75.4 ˚C?
Answer:
Should be 145854.24J or:
145.9 KJ
Explanation:
I did the calculations
fill in the blanks and the following paragraph should correctly describe the behavior of waves A wave is a(n)________ That carries ____ through space. Some waves travel through empty space. Other waves must travel through a material, also known as a _____. Waves transfer energy but not ______.
Answer:
1) current
2) energy
3) medium
4) matter
Explanation:
A wave is a medium that carries energy through space. Some waves travel through empty space. Other waves must travel through a material, also known as an energy. Waves transfer energy but not matter.
What is wave?A wave is a phenomenon that flows across a material medium without leaving any lasting mark. Mechanical or electromagnetic waves can be used to classify it. Transverse and longitudinal are the two main forms.
A disturbance that travels through a medium with a transfer of matter and without a transfer of energy best describes a wave.
The primary distinction between transverse and longitudinal waves is that in transverse waves, wave particles travel perpendicular to the wave's direction, but in longitudinal waves, wave particles move horizontally.
A wave is a medium that carries energy through space. Some waves travel through empty space. Other waves must travel through a material, also known as an energy. Waves transfer energy but not matter.
Hence, the correct answer for the blanks are medium,energy,and matter.
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if the pendulum were to be taken to the moon, where the acceleration of gravity is gg /6, would the period increase, decrease, or stay the same?
The time period is inversely proportional to the gravitational pull, or "g." For instance, if a simple pendulum is moved to the moon from Earth, its pull will decrease, resulting in a longer period.
On the moon, the value of "g" is one sixth of what it is on Earth's surface.
Are pendulums slower than the moon in terms of speed?The moon's pendulum will oscillate at a slower rate than Earth's because its period is longer there.
What influences the period's speed for the pendulum?The period is influenced by three factors: the mass, the angle, and the length.
To accelerate the pendulum, do you move it up or down?A pendulum's effective length can be altered by either raising or lowering the bob. On the pendulum rod, you'll find the pendulum bob. The clock will move more quickly if you raise the bob. The clock will also run slower if the bob is lowered.
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A 2.0 kg bullet is fired into a sandbag sitting on a wagon. The combined mass of the wagon and the sandbag is 4.5 kg. a) If the wagon/sandbag/bullet moved together with a speed of 0.22 m/s immediately after impact with the bullet, with what speed did the bullet enter the sandbag? b) Is this an elastic or inelastic collision? Explain.
Answer:
To answer your question use the code ICE on here to get your answer works every time for me hope this helps
When an alternating current circuit supplies power to a ? load, the circuit voltage and current are in-phase with each other. this is also known as unity power factor.
walk done in units time is called
Answer:
Explanation:
work done per unit time is caleed power.it's SI unit is watt.it depends upon time.
a 10-mm-long glider with a mass of 680 kgkg (including the passengers) is gliding horizontally through the air at 38 m/sm/s when a 60 kgkg skydiver drops out by releasing his grip on the glider.
What is the glider's speed just after the skydiver lets go?
The glider's speed just after the skydiver lets go is approximately 39.52 m/s.
To answer this question, we can use the conservation of momentum principle. Before the skydiver lets go, the combined momentum of the glider and skydiver is:
Initial momentum = (mass of glider + mass of skydiver) * initial velocity
Initial momentum = (680 kg + 60 kg) * 38 m/s
When the skydiver releases his grip, the glider's mass is reduced by the skydiver's mass. Let v be the glider's velocity just after the skydiver lets go:
Final momentum = mass of glider * v
Since momentum is conserved:
(mass of glider + mass of skydiver) * initial velocity = mass of glider * v
Now, we can solve for v:
v = [(680 kg + 60 kg) * 38 m/s] / 680 kg
v ≈ 39.52 m/s
Just after the skydiver lets go, the glider's speed is approximately 39.52 m/s.
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1. A fairground ride consists of a large vertical drum that spins so fast that everyone inside it stays pinned against the wall when the floor drops away. The diameter of the drum is 10 m. Assume that the coefficient of static friction between the drum and the rider's clothes is 0.15. a) What is the minimum speed required for the riders so that they stay pinned against the inside of the drum when the floor drops away? b) What is the angular velocity of the drum at this speed?
Answer:
a) In order for the riders to stay pinned against the inside of the drum when the floor drops away, the force of friction between the drum and the riders must be greater than or equal to the force of gravity pulling them down.The maximum force of friction that can be exerted on a rider is given by:f_max = μNwhere μ is the coefficient of static friction and N is the normal force acting on the rider.At the minimum speed required for the riders to stay pinned against the inside of the drum, the normal force acting on each rider is equal to their weight, so:N = mgwhere m is the mass of the rider and g is the acceleration due to gravity.The force of gravity pulling the rider down is:F = mgTherefore, the minimum speed required for the riders to stay pinned against the inside of the drum is given by:f_max = FμN = mgv_min = sqrt(rgμ)where r is the radius of the drum, which is half of the diameter, so r = 5m.Plugging in the values, we get:v_min = sqrt(59.80.15) = 2.16 m/sb) The angular velocity of the drum at this speed can be found using the formula:v = ωrwhere v is the linear velocity of the riders at the minimum speed required to stay pinned against the inside of the drum, r is the radius of the drum, and ω is the angular velocity of the drum.Rearranging this equation to solve for ω, we get:ω = v/rPlugging in the values, we get:ω = 2.16/5 = 0.432 rad/sSo the angular velocity of the drum at the minimum speed required for the riders to stay pinned against the inside of the drum is 0.432 rad/s.
There is evidence that the Earth's magnetic field is in the process of flipping its polarity. What impact could this have on animal migration?
What are the variables do you think to be considered to determine the acceleration of an object?
A plane moves with a velocity of 63.5 m/s at 32 degrees South of East. Calculate the plane's horizontal and vertical velocity components.
The plane's horizontal and vertical velocity components are 33.65 m/s and 53.85 m/s respectively.
What is velocity ?
velocity is defined as rate of change of displacement d of the object with respect to rate of change in time t. In mathematics It is written as :
v = d/t
it should be noted that, velocity is nothing but speed in particular direction. That is velocity is vector quality having both magnitude and direction where as speed is just the magnitude of velocity.
It is given that :
A plane moves with a velocity v of 63.5 m/s at 32 degrees South of East with the horizontal.
Therefore, the planes horizontal velocity components will be :
v₁ = vsinθ
v₁ = 63.5 x sin 32⁰
v₁ = 33.65 m/s
the planes vertical velocity components will be :
v₂ = vsinθ
v₂ = 63.5 x cos 32⁰
v₂ = 53.85 m/s
Therefore, the plane's horizontal and vertical velocity components are 33.65 m/s and 53.85 m/s respectively.
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The wave function for a traveling wave on a taut string is (in SI units)
y(x,t) = 0.375 sin (14pt - 2px + p/4)
(a) What are the speed and direction of travel of the wave?
speed _____ m/s
direction_________
(positive x-direction, positive y-direction, positive z-direction, negative x-direction, negative y-direction, negative z-direction)
(b) What is the vertical position of an element of the string at t = 0, x = 0.178 m?
________m
(c) What is the wavelength of the wave?
____________m
(d) What is the frequency of the wave?
________ Hz
(e) What is the maximum transverse speed of an element of the string?
_____ m/s
(a) The speed and direction of travel of the wave is 7 m/s positive x-direction.
(b) The vertical position of an element of the string at t = 0, x = 0.178 m is -3.1 m
(c) The wavelength of the wave is 2 m
(d) The frequency of the wave is 7 Hz
(e) The maximum transverse speed of an element of the string is 16.48 m/s.
The wave functionThe general function of the wave is:
y (x, t) A sin (kx - ωt)
We have, y(x, t) = 0.375 sin (14\(\pi\)t - 2\(\pi\)x + \(\pi\)/4)
So,
a. the speed and direction of travel of the wave:
v = ω/k
= 14/2
= 7 m/s ⇒ positive x-direction
b. The vertical position of an element of the string at t = 0, x = 0.178 m
y = 0.375 sin (-2\(\pi\)x/14 + \(\pi\)/4)
= -3.1 m
c. The wavelength of the wave:
λ = 4/2
= 2 m
d. The frequency of the wave
f = ω/2
= 14/2
= 7 Hz
e. The maximum transverse speed of an element of the string:
ωA
= 14π (0.375)
= 16.48 m/s
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If you are holding a stack of books at your waist and then you walk across the room your hands did?
1) efficiency
2) power
3) work
4) no work
Answer:
3. Work
Explanation:
Number 1 isn't correct because you are not using efficiency to hold books and walk across the room.
Number 2 could be correct but isn't in this situation because you use power only to hold the books but not to walk across the room.
Number 4 is not correct because you need to do work to do something.