Answer:
Wouldn't it be the muscles in your arms or legs since they have to push the most while they have gravity acting upon them?
Explanation:
a toaster has a heating element of 15 ohms and is connected to 120 volt outlet. show that the current drawn by the toaster is 8 amps.
Answer:
Explanation:
Ohm's law:
V = IR
Given V = 120 V and R = 15 Ω:
120 V = I (15 Ω)
I = 8 A
The more power applied to an object, the faster work is done to it.
True
False
Answer:
True
Explanation:
The power of applied to an object is calculated by dividing the work done by time in seconds.That is;Power = work done/time
From this relationship, power is directly proportional to work done and inversely proportional to time, thus an increase in power means work will be done faster as time taken will be less.The more ______ an object moves, the more __________ it has (Kinetic Energy)
Answer:
__________
Explanation:
An engineer is designing a runway for a witch. Several brooms will use the runway and the engineer must design it so that it is long enough for the largest brooms to become airborne before the runway ends. If the largest broom accelerates at 3.30 m/s^2 and has a liftoff speed of 88.0 m/s, what is the minimum allowed length for the runway?
Answer:
1170 m
Explanation:
Given:
a = 3.30 m/s²
v₀ = 0 m/s
v = 88.0 m/s
x₀ = 0 m
Find:
x
v² = v₀² + 2a(x - x₀)
(88.0 m/s)² = (0 m/s)² + 2 (3.30 m/s²) (x - 0 m)
x = 1173.33 m
Rounded to 3 sig-figs, the runway must be at least 1170 meters long.
A book with a mass of 5 kg is pushed off a table with the velocity of 2 m/s. What is its momentum?
A. 7 kg-m/s
B. 3 kg-m/s
C. 15 kg-m/s
D. 10 kg-m/s
Momentum=Mass•Velocity
=5 kg•2 m/s
=10 kg-m/s
The momentum of a book with a mass of 5 kg is pushed off a table with a velocity of 2 m/s is option D. 10 kg-m/s.
What is momentum?Momentum is the quantity of motion of a moving body, measured as a product of its mass and velocity.It is the vector quantity. It has both magnitude and direction.In the International System of Units, the unit of measurement of momentum is Kg*m/s.What is the momentum of a book with a mass of 5 kg is pushed off a table with a velocity of 2 m/s? Formula of momentum = p = mvHere,
p = momentum
m = mass
v = velocity
Here the given mass is 5 and velocity is 2. then,p = mv
=5×2
=10 Kg*m/s
Hence, the momentum of a book with a mass of 5 kg is pushed off a table with a velocity of 2 m/s is option D. 10 kg-m/s.
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a cannonball is fired across a flat field at an angle of 43 degrees with an initial speed 32 m/s and height of 12 m.
1)Write a set parametric equations for the motion of the cannon ball
2)Determine how long the cannon ball was in the air
3)Determine how far the cannon ball traveled in the air
4) Determine when the cannon ball reaches its maximum height
5) Determine the maximum height reached by the cannon ball
1) [tex]x= v_{0x} t = 23.4 t\\y=y_0 + v_{0y}t-\frac{1}{2}gt^2 = 12+21.8t -4.9t^2[/tex]
The initial data of the projectile are:
[tex]y_0 = 12 m[/tex] is the initial height
[tex]v_0 = 32 m/s[/tex] is the initial speed of the projectile, so its components along the x- and y- directions are
[tex]v_{0x} = v_0 cos \theta = (32 m/s)(cos 43^{\circ})=23.4 m/s\\v_{0y} = v_0 sin \theta = (32 m/s)(sin 43^{\circ})=21.8 m/s[/tex]
The motion of the cannonball along the x-direction is a uniform motion with constant speed, while on the y-direction it is an uniformly accelerated motion with constant acceleration g=9.8 m/s^2 downward. So, the two equations of motion of the projectile along the two directions are:
[tex]x= v_{0x} t = 23.4 t\\y=y_0 + v_{0y}t-\frac{1}{2}gt^2 = 12+21.8t -4.9t^2[/tex]
2) 4.94 s
To determine how long the cannon ball was in the air, we need to find the time t at which the cannonball hits the ground, so the time t at which y(t)=0:
[tex]0=12+21.8t-4.9 t^2[/tex]
Solving the equation with the formula, we have:
[tex]t_{1,2}=\frac{-21.8\pm \sqrt{(21.8)^2-4(-4.9)(12)}}{2(-4.9)}[/tex]
which has two solutions:
t = -0.50 s
t = 4.94 s
Discarding the first solution which is a negative time so it has no physical meaning, the correct solution is
t = 4.94 s
3) 115.6 m
To determine how far the cannonball travelled, we need to find the value of the horizontal position x(t) when the ball hits the ground, at t=4.94 s. Substituting this value into the equation of motion along x, we find:
[tex]x=v_{0x}t=(23.4 m/s)(4.94 s)=115.6 m[/tex]
4) 2.22 s
The cannonball reaches its maximum height when the vertical velocity becaomes zero.
The vertical velocity at time t is given by
[tex]v_y(t)= v_{0y} -gt[/tex]
where
g = 9.8 m/s^2 is the acceleration due to gravity
Substutiting [tex]v_y(t)=0[/tex] and solving for t, we find
[tex]t=\frac{v_{0y}}{g}=\frac{21.8 m/s}{9.8 m/s^2}=2.22 s[/tex]
5) 36.2 m
The maximum height reached by the cannon is equal to the vertical postion y(t) when the vertical velocity is zero, so when t=2.22 s. Substituting this value into the equation of the vertical motion, we find:
[tex]y(t)=y_0 + v_{0y}t-\frac{1}{2}gt^2=12+(21.8)(2.22)-(4.9)(2.22)^2=36.2 m[/tex]
Find the total electric charge of 1.7 kg of electrons. me=9.11×10−31kg, e=1.60×10−19C.
Answer:
[tex]2.99\cdot 10^{11}C[/tex]
Explanation:
The mass of one electron is
[tex]m_e = 9.11\cdot 10^{-31}kg[/tex]
So the number of electrons contained in M=1.7 kg of mass is
[tex]N=\frac{M}{m_e}=\frac{1.7 kg}{9.11\cdot 10^{-31}kg}=1.87\cdot 10^{30}[/tex]
The charge of one electron is
[tex]e=1.60\cdot 10^{-19} C[/tex]
So, the total charge of these electrons is equal to the charge of one electron times the number of electrons:
[tex]Q=Ne=(1.87\cdot 10^{30})(1.6\cdot 10^{-19}C)=2.99\cdot 10^{11}C[/tex]
Final answer:
The total electric charge of 1.7 kg of electrons is 1.87 × 10^50 electrons.
Explanation:
The total electric charge of 1.7 kg of electrons can be calculated using the formula:
Total charge = Number of electrons * Charge per electron
Given that the charge per electron is e = 1.60 × 10^-19 C, we can calculate the number of electrons:
Number of electrons = Total charge / Charge per electron
Plugging in the values, we get:
Number of electrons = 1.7 kg / (9.11 × 10^-31 C)
Simplifying this expression gives us:
Number of electrons = 1.87 × 10^50 electrons
How does black body radiation explain particle nature of light?
Any object with a temperature above absolute zero emits light at all wavelengths. If the object is perfectly black (so it doesn't reflect any light), then the light that comes from it is called blackbody radiation.
The energy of blackbody radiation is not shared evenly by all wavelengths of light. The spectrum of blackbody radiation (below) shows that some wavelengths get more energy than others. Three spectra are shown, for three different temperatures. (One of the curves is for the surface temperature of the Sun, 5770 K.)
Which of the following is true?
A.
Plants and animals are both autotrophs.
B.
Plants are heterotrophs, and animals are autotrophs.
C.
Plants and animals are both heterotrophs.
D.
Plants are autotrophs, and animals are heterotrophsWhich of the following is true?
A.
Plants and animals are both autotrophs.
B.
Plants are heterotrophs, and animals are autotrophs.
C.
Plants and animals are both heterotrophs.
D.
Plants are autotrophs, and animals are heterotrophs
Answer:
D. Plants are autotrophs and animals are heterotrophs
Explanation:
Plants are autotrophs because they make their own food through photosynthesis
Animals have to consume other animals or plants as food and can't make food on their own, so they are heterotrophs
Answer:
D. Plants are autotrophs and animals are heterotrophs
Explanation:
does the force affect the accelerationof the car?
Force = mass*acceleration
Force and acceleration are dependent on one another, and therefore, the force does affect the acceleration of the car.
Answer:Any force can affect the acceleration of a car so yes.
Explanation:
a rock dropped on the moon will increases its speed from 0 m/s (its starting speed when first dropped) to 4.9 m/s in about 3 seconds. What value do your calculate for the magnitude of the acceleration of gravity on the moon?
Answer:
a = 1.63 m/s²
Explanation:
Given in the question that,
initial speed of the rock = u = 0 m/s
final speed of the rock = v = 4.9 m/ s
time taken = t = 3 sec
We will use Newton's law of motion
Formula to use to calculate the acceleration of gravity on moon
v - u = a(t)4.9 - 0 = a(3)
4.9 = a(3)
a = 4.9/3
a = 1.63 m/s²
PLEASE HELP ASAP!!
in hydroelectric power plants the energy from moving water is converted into electric power what kind of energy transformation occurs when the energy is converted?
A. Heat to electrical.
B. Mechanical to electrical.
C. Electrical to mechanical.
D. Light to electrical.
your answer would be B. Mechanical to electrical
The energy transformation in hydroelectric power plants is from mechanical to electrical. Water potential energy is converted to kinetic energy to turn turbines, which are then used to generate electricity with high efficiency.
In hydroelectric power plants, the energy transformation that occurs when moving water is converted into electric power is mechanical to electrical. The process begins with water at high elevations, which possesses potential energy due to gravity. When the water flows down and over the dam, this potential energy is transformed into kinetic energy. This kinetic energy is then used to turn turbines, which is a mechanical process.
The turbines are connected to generators, which then convert the mechanical energy into electrical energy. This conversion is highly efficient, with typical hydroelectric turbine-generators achieving around 90 percent efficiency or higher. Additionally, the ultimate source of the electrical energy produced by a hydroelectric plant is solar energy, which drives the hydrological cycle that elevates water to higher altitudes.
Sodium chloride (NaCl) is an ionic solid. It dissolves easily in water. Which property of water allows it to dissolve NaCl? Water has a high specific heat. Water contains oxygen. Water has surface tension. Water is a polar molecule.
Answer:
Water is a polar molecule.
Explanation:
The fundamental rule of solubility is that "like solutes would dissolve in like solvents". Both NaCl and water are polar compounds.
NaCl is an ionic compound which forms from transfer of an electron from the Cl atom and a loss of electron from Na. This leaves a separation of charge on both atoms with Na being positively charged and Cl being negatively charged. This charge separation makes NaCl a polar compound.
Water on the other hand is a polar covalent solvent. The covalent bond results from the sharing of electrons between oxygen and hydrogen atoms. Due to the more electronegative nature of Oxygen, it pulls the shared electron more closely to itself than the Hydrogen atom. This unequal sharing of the electron leaves a net positive charge on Hydrogen and a negative charge on Oxygen.
For this reason, NaCl will dissolve in water.
Answer: Water is a polar molecule.
Explanation: When solid sodium chloride (salt) dissolves in water, it separates into sodium ions and chloride ions that move about freely in the water solution. The attraction between the Na+ and Cl− ions in the solid is so strong that only highly polar solvents like water will dissolve NaCl.
Also i got it right on the test
Which statements describe the magnitude of an earthquake? Check all that apply.
It is detected by a seismograph.
It is measured by the Mercalli scale.
It is based on the size of seismic waves.
It is affected by the amount of fault movement.
It is used to determine damage caused by earthquakes.
the correct answers are :
1: It is detected by a seismograph.
3: It is based on the size of seismic waves.
4: It is affected by the amount of fault movement.
Answer:
The correct choices are
It is detected by a seismograph.
It is based on the size of seismic waves.
It is affected by the amount of fault movement.
Explanation:
seismograph is an instrument which is used to determine the earthquakes and records them.
The size of seismic waves is a measure of how strong the earthquake is.
5. Limestone typically doesn't accumulate in the ocean at depths below 4,000 meters because below that depth, calcite is _______.
6. Based on the principle of original horizontality, geologists conclude that layers of sedimentary rock that have been tilted must have been subjected to _______.
7. Based on the principle of inclusions, the cobbles in conglomerate must have been formed _______ the conglomerate.
8. Geologists use the principle of _______ to justify using fossils in a sample of sedimentary rock to determine the rock’s age.
9. Partings between adjacent beds of sedimentary rock may represent periods of _______, which could range from a few decades to a few centuries.
10. Some graded beds, especially those resulting from deposition by a fast-moving debris flow, are reversed, which means _______ material is at the top instead of at the bottom.
Answer:
Explanation:
5. Limestone typically doesn't accumulate in the ocean at depths below 4,000 meters because below that depth, calcite is ___not preserved ____.
The calcite compensation depth CCD is the depth at which the rate of dissolution of calcite increases beyond that of accumulation.
6. Based on the principle of original horizontality, geologists conclude that layers of sedimentary rock that have been tilted must have been subjected to __tectonic forces_____.
Tectonic forces causes changes in a particle terrain
7. Based on the principle of inclusions, the cobbles in conglomerate must have been formed __earlier than_____ the conglomerate.
The principle of inclusion states that the inclusion is older than the rock that contains it.
8. Geologists use the principle of __fossil and fauna succession _____ to justify using fossils in a sample of sedimentary rock to determine the rock’s age.
The principle of fossil and fauna succession was credited to Williams Smith and it is used for relative dating of a sedimentary sequence. Here, fossils of plants and animals are used to date a sequence.
9. Partings between adjacent beds of sedimentary rock may represent periods of __unconformity _____, which could range from a few decades to a few centuries.
An unconformity is a period of non-depsotion or erosion within a rock layer.
10. Some graded beds, especially those resulting from deposition by a fast-moving debris flow, are reversed, which means ___the oldest____ material is at the top instead of at the bottom.
From the principle of superposition of strata, we know that the oldest layer is at the bottom of the sequence and the youngest is on top.
Answer:
1. high energy
2. deposition
3. Silt
4. limestone
5. Soluble
6. tectonic forces
7. before
8. principle of faunal succession
9. non deposition
10. coarser
Help for 25 points.
2. Check all that apply. Electromagnetic waves are:
Mechanical waves
Transverse waves
Pressure waves
Move perpendicular
Move parallel
Frequency is directly related to speed
Frequency is inversely related to wavelength
Wavelength is directly related to speed
Require a medium
Transfer energy
Answer:
Transverse waves
Move perpendicular
Frequency is directly related to speed
Frequency is inversely related to wavelength
Wavelength is directly related to speed
Transfer energy
Explanation:
Electromagnetic waves consist of periodic oscillations of electric and magnetic fields. As all waves, they transfer energy, but not matter,
Electromagnetic waves are transverse waves, which means that they oscillate in a plane perpendicular to the direction of propagation of the wave. The speed, the wavelength and the frequency of electromagnetic waves are related by the following equation:
[tex]c=f\lambda[/tex]
where
c is the speed (speed of light, which is constant for electromagnetic waves travelling in a vacuum)
f is the frequency
[tex]\lambda[/tex] is the wavelength
From this equation we see that:
- The frequency is directly related to the speed
- The wavelength is directly related to the speed
- The frequency is inversely related to the speed
According to the law of reflection, the _____ is equal to the angle of incidence.
A. angle of refraction
B. reflected ray
C. angle of reflection
The angle of reflection is equal to the angle of incidence.
The answer is C.
Answer:
C. angle of reflection
Explanation:
As we know that as per law of reflection of light angle of incidence with respect to the normal must be equal to the angle of reflection with normal in other direction.
So we can say that
angle of incidence = angle of reflection
so here we can say that the correct answer would be
C. angle of reflection
so the light ray will reflect at the same angle as that of angle of incidence given in it
so it must be
[tex]\theta_i = \theta_r[/tex]
our galaxy is Spiral, elliptical or irregular?
AnsWER
JANNAH
Explanation:
BECAUSE
Which term refers to a quantity that has both magnitude and direction
A vector is any quantity that has magnitude and direction. A scalar is any quantity that has magnitude but has no direction.Displacement and velocity are vectors, distamce and speed are scalars.
The term referring to a quantity with both magnitude and direction is vector. The concept of vector differentiates it from a scalar which only has magnitude. An example is velocity, which is a vector measurement.
Explanation:The term that refers to a quantity that has both magnitude and direction in physics is known as a vector. This differentiates it from a scalar which only has magnitude. For instance, velocity is a vector quantity because it includes both speed (a scalar quantity) and direction. If you say a car is moving at 60 miles per hour, that's speed. But if you say the car is moving at 60 miles per hour to the north, that's velocity, which is a vector measurement.Physics is the branch of science that deals with the study of matter, energy, and the interactions between them. It includes the study of various physical quantities, including those that have both magnitude and direction. One such quantity is velocity, which is defined as the rate of change of displacement with respect to time. Velocity has both magnitude (speed) and direction (the direction of motion).
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Which speed is at at the sound barrier?
The answer is a, 343
In dry air at 20 °C (68 °F), the speed of sound is 343 metres per second (about 767 mph, 1234 km/h or 1,125 ft/s).
The answer is 343 m/s.
What is the term for visual representation of data
A.extrapolation
B.graph
C.interpolation
D.Correlation
I think it is graph (b). You can visually see the data on a graph.
A skier on a hill has 4000J of kinetic energy and 3000J of potential energy. After sliding down the
hill a ways, their potential energy is 2000J.
a) Since they slid "down" the hill, what do you expect for change in potential energy (greater or
less)? Why?
b) Assuming that there is no loss due to friction, what would be the kinetic energy at the second
position? (Use Ebefore = Eafter and show all steps)
c) Since there's always "some" friction loss, would the "actual" kinetic energy be less or more than
your answer in b)?
Answer:
a) Less because the kinetic energy of the skier increased as they descended down the kill in turn the potential energy dropped
sorry only have the a part
Explanation:
A parallel circuit has a total current of 4 Amperes and an equivalent resistance of .5 Ohms. What is the power in this circuit?
Answer:
=8.0 Watts
Explanation:
Power is a ratio of work done over time. The power in an electric circuit is calculated using the following formula:
P=I²R
P is power, I is current, R is resistance
Therefore, Power= 4²ₓ 0.5Ω
=8.0 Watts
The power in the parallel circuit is 8 W.
Explanation:
Power in an electric circuit is defined as the current generated for a given amount of input voltage. So power of an electric circuit is directly proportional to the product of current and voltage in the circuit. The mathematical representation is
[tex]\text { Power }=\text { Current } \times \text { voltage }[/tex]
As per Ohm’s law, the current flowing in a closed circuit is directly proportional to the voltage applied to the circuit and resistance is the constant of proportionality between them. So
[tex]\text { Current } \propto \text { voltage }[/tex]
[tex]\text {Voltage}=\text {Current} \times \text {Resistance}[/tex]
Thus the formula for power in terms of resistance will look like
[tex]\text { Power }=\text { Current } \times \text { current } \times \text { resistance }=(\text { Current })^{2} \times \text { Resistance }[/tex]
As it is given that the net current in the parallel circuit is 4 A and equivalent resistance of the parallel circuit is given as 0.5 ohms. Then power is
[tex]\text { Power }=4 \times 4 \times 0.5 = 8 W[/tex]
Thus, the power in the parallel circuit is 8 W.
foundations of buildings are wide and walls give reason
They are wide because they need to provide support for the rest of the building. The wider the foundation, the stronger the overall structure is going to be. If the base was not wide, and you continued to put weight on it then it would eventually collapse. Think of it as legos
" The correct answer is that walls give additional support to the building's structure, which helps to distribute the weight of the building over a larger area, thereby reducing the pressure on the soil beneath.
Foundations of buildings are constructed to be wide for several reasons related to the principles of physics and soil mechanics. The primary reason is to increase the surface area over which the weight of the building is distributed. By spreading the load over a larger area, the pressure exerted on the ground is reduced, which helps to prevent the foundation from sinking into the soil. This is particularly important in areas where the soil has a low bearing capacity.
In addition to the wide foundation, walls play a crucial role in supporting the structure. Walls are built on top of the foundation and extend upward to support the floors and roof. They serve multiple functions:
1. Load Bearing: Walls made of bricks, concrete, or other strong materials can bear the load of the floors and roof, transferring this weight to the foundation and then to the ground.
2. Lateral Support: Walls provide lateral support to resist forces acting horizontally, such as wind loads, earthquake forces, and the pressure of adjacent soil when the ground is sloped. This helps to stabilize the building and prevent it from overturning or sliding.
3. Structural Integrity: Walls contribute to the overall rigidity and stability of the building's structure. They help to keep the building square and plumb, ensuring that the windows, doors, and other components function correctly.
4. Insulation and Protection: Walls also provide thermal insulation and protection from the elements, ensuring a comfortable indoor environment and protecting the interior from weather-related damage.
5. Space Definition: Walls define the interior spaces of a building, creating rooms and corridors, and they also provide privacy and security.
In summary, while the foundation serves as the base that supports the entire structure by distributing its weight over a wide area, the walls are essential for providing additional support, stability, and functionality to the building. They work together to ensure the building's safety and longevity."
A machine is classified as a compound machine if it
A. has moving parts
B. has an IMA greater than 1
C. is made up of two or more simple machines that operate together
D. is very efficient
the answer is very clearly C.
a common example is scissors
Answer:
The correct option is: A machine is classified as a compound machine if it C. is made up of two or more simple machines that operate together.
Explanation:
Composite machines are mechanical devices that have been formed from two or more simpler machines which are connected in series. In this way, when one of these parts of the composite machine is activated, the rest work in a coordinated manner, being able to offer together a function that individually could not.
Composite machines have operators that work in coordination. These operators can be:
Mechanical operators : They are the elements that allow the operation of the machine turning the force into movement. This set is what is called a mechanism. Energy operators: are responsible for storing energy or force and transform it into another type so that the device can be activated and perform its function.In short, the correct option is: A machine is classified as a compound machine if it C. is made up of two or more simple machines that operate together.
The joule is an example of units of work. Which of the following is not a valid unit of work? ft-lb (kg-m2)/s2 inch-ton lb/s2
The "lb/s² " is not a valid unit of work.
Each of the others is (a unit of force) x (a unit of distance) which is pretty much the definition of work.
The joule is the metric unit of measurement for work and energy, with 1 J = 1 N•m. Inch-ton is not a valid unit of work.
The joule is the metric unit of measurement for work and energy, where 1 J = 1 N•m. Work and energy share the same units in the SI system. In the context of this question, inch-ton is not a valid unit of work because it does not represent the correct combination of force and distance.
Akshay wants to study global warming and climate change. which field of study be most useful to him
Answer:
Meteorology
Explanation:
Answer:
Explanation:
Climatology.
If anyone wants to study global warming and climate change he should study climatology in which all the phenomenon related to climate, weather and its impact on environment are studied. Global warming a great concern now a days and it impact our environment in negative manner. So this topic is also comes under climatology.
Place the waves on the EM spectrum from longest to shortest wavelength:
ultraviolet, infrared, gamma, radio, microwave, x – ray, visible
Two double bonds means that the total number of electrons being shared in the molecule is
Answer:
9 terms. In carbon dioxide (CO2), there are two oxygen atoms for each carbon atom. Each oxygen atom forms a double bond with carbon, so the molecule is formed by two double bonds. Two double bonds means that the total number of electrons being shared in the molecule is.
Explanation:
Ultraviolet rays are used to _____.
Kill cancer cells through radiation therapy
Grow plants wear little light is available
Keep food warm for extended periods of time
Scan packages and baggage for dangerous content
Answer:
Grow plants where little light is available
Explanation:
The plants need the ultraviolet rays in order to be able to survive and develop. The need mainly comes from the dependence of these rays for production of food, in a process known as photosynthesis. The plants are producers, thus they create their own food. In order to be able to do that they are using the ultraviolet rays, as well as water, and carbon dioxide. By combining them, the plants manage to create glucose for them, and that is their food source. The plants that are kept at places where there's not enough light are often exposed to ultraviolet rays so that they are able to perform the process of photosynthesis and grow properly.