Answer:
A
Explanation:
Waldo needs to know how much force to apply in order to move a 4000-kg object at 2 m/S2. Which law should he refer to
Answer:
Newton's second law of motion?
Multiple choice: Sunspots appear dark because
(a) they are patches of the photosphere that occasionally burn up, creating soot;
(b) the changing magnetic polarity of the Sun causes gas in the sunspot to cool down substantially;
(c) they are regions in which strong magnetic fields make it difficult for fresh supplies of hot, ionized gas to reach the photosphere;
(d) they are much hotter than the surrounding area, so their emission peaks at ultraviolet wavelengths, which our eyes cannot see; or
(e) they are holes in the photosphere through which the cooler interior of the Sun is visible.
Answer: C. They are regions in which strong magnetic fields make it difficult for fresh supplies of hot, ionized gas to reach the photosphere
Explanation:
Sunspots appear dark because they are regions in which strong magnetic fields make it difficult for fresh supplies of hot, ionized gas to reach the photosphere.
Sunspots are typically cooler than their surroundings. For example, the temperature of a large sunspot can be about 4,000 Kelvin which is lower than the temperature of the photosphere around it which is about 5,800 Kelvin.
When you use a microwave, what is the main way that heat is transferred?
1. radiation
2. convection
3.conduction
Answer:
the correct answer is 1. radiation
Please ans fast I will mark brainliest
Answer:
Electrical energy; chemical energy.
Explanation:
Energy can be defined as the ability (capacity) to do work. The various forms of energy are solar energy, electrical energy, chemical energy, thermal energy, wind energy, nuclear energy etc.
In this scenario, electrical energy is present in the charger and the cable while we have chemical energy in the battery of the mobile phone.
The Law of Conservation of Energy states that energy cannot be destroyed but can only be transformed or converted from one form to another.
This ultimately implies that, the electrical energy in the charger and cable is used to charge the battery of the mobile phone as chemical energy.
The components of vector A are Ax = + 3.90 and Ay = -4.00. What is the angle measured counterclockwise from the +x-axis to vector A?
Answer: [tex]314.28^{\circ}[/tex]
Explanation:
Given
X component of the vector is [tex]A_x=3.9[/tex]
Y component of the vector is [tex]A_y=-4[/tex]
From the figure, we can write
[tex]\Rightarrow \tan x=\dfrac{4}{3.9}\\\\\Rightarrow x=45.72^{\circ}[/tex]
Thus, the angle measured counterclockwise from the x-axis to vector A is
[tex]360^{\circ}-45.72^{\circ}=314.28^{\circ}[/tex]
Which of the five themes of geography would a person most likely use to study the importation of Chinese goods into the United States?
A.
places and regions
B.
movement
C.
human systems
D.
physical systems
El diámetro del embolo de una jeringa para inyección mide 1.5 cm. Una enfermera ejerce una fuerza de 2N cuando inyecta a su paciente. Calcule la presión que ejerce el fluido inyectado sobre las venas.
Answer:
Presión = 11111,11 N/m
Explanation:
Dados los siguientes datos;
Diámetro = 1,5 cm a metros = 1,5 / 100 = 0,015 m
Fuerza = 2N
Para encontrar la presión;
En primer lugar, determinaríamos el área del círculo usando la fórmula;
Área del círculo = πr²
Radio = diámetro/2 = 0.015/2 = 0.0075 m
Área de la jeringa = 3.142 * 0.0075²
Área de la jeringa = 3.142 * 0.00005625
Área de la jeringa = 0.00018 metros
Ahora, podemos encontrar la presión usando la fórmula;
Presión = fuerza/área
Presión = 2/0.00018
Presión = 11111,11 N/m
If an electron moves in a circle of radius 21 cm perpendicular to a B field of 0.4 T, what are the speed of the electron and the frequency of motion?
Answer:
a)
[tex]v = 4.048 *10^6[/tex] m/s
b)
Angular frequency = [tex]1.92 * 10^7[/tex]
Explanation:
As we know
[tex]v = \frac{qBr}{m}[/tex]
q is the charge on the electron = [tex]3.2 * 10^{-19}[/tex] C
B is the magnetic field in Tesla = [tex]0.4[/tex] T
r is the radius of the circle = [tex]0.21[/tex] m
mass of the electrons = [tex]6.64 * 10^{-27}[/tex] Kg
a)
Substituting the given values in above equation, we get -
[tex]v = \frac{3.2 * 10^{-19}*0.4*0.21}{6.64 * 10^{-27}} \\v = 4.048 *10^6[/tex]m/s
b)
Angular frequency =
[tex]\frac{4.048 * 10^6 }{0.21} \\1.92 * 10^7[/tex]
If the radius increased between the two objects what would happen to gravitational force between them?
Answer:
The Gravitational Force would decrease
Explanation:
The equation Gm1m2/r^2 is the equation for gravitational force. If you look, as we increase the radius, the overall value will decrease as we move further apart.
A driver starts his parked car and within 4.6 seconds, reaches a velocity of 15 m/s. What is his acceleration?
What will be the change in velocity of a 850kg car if a force of 50,000 N
is applies to it for 0.5 seconds?
Answer:
29.412m/s
Explanation:
[tex]F=ma[/tex] where F= force, m= mass, and a=acceleration
we also know that,
a = Δv / t where Δv = change in velocity and t = time
thus F = m ( Δv / t)
[tex]50000=850(\frac{v}{0.5})[/tex]
[tex]\frac{50000}{1700}=[/tex] Δv
29.412m/s=Δv
How do positive and negative acceleration differ?
Positive acceleration represents an object speeding up; negative acceleration represents an object slowing down.
Positive acceleration moves north or east; negative acceleration moves south or west.
Positive acceleration occurs when there is more velocity than speed; negative acceleration occurs when there is less velocity than speed.
Positive acceleration occurs when an object changes its speed but not its direction; negative acceleration occurs when an object changes both its speed and direction.
Answer:
Positive acceleration moves north and east but negative acceleration moves south and west
If the car goes exits a freeway and goes from 65
mph to 35 mph is it accelerating?
Answer:
No, the car is decelerating
Explanation:
No the car is decelerating if it exits a freeway and goes from 65
mph to 35 mph since the change in velocity is negative.
change in velocity = final - initial
change in velocity = 35 - 65
change in velocity = -30mph
Since the change in velocity is negative, hence the car is decelerating. Deceleration is a negative acceleration
A 12 kg rock that is moving at 5.1 m/s in the +x direction experiences a net impulse of 98 N-m in the same direction. What is its final momentum?
The final momentum will be 159.2 kg m/sec. The change in the momentum is the difference of the final and the initial momentum.
What is momentum?The momentum is defined as the product of mass and the velocity of the body. It is denoted by the letter P. It occurs due to the applied force. Its unit is Kg m/s.
The given data in the problem is;
The mass of rock is,12 kg
The velocity is,v= 5.1 m/s
The momentum is P
The momentum is found as;
[tex]\rm P_i = mv \\\\ \rm P_i = 12 \times 5.1 \\\\ P_i=61.2 \ kg m/sec[/tex]
From Newtons second law, impulse is equal to the change in the momentum.
[tex]\rm I =\triangle P \\\\ \rm I =P_f-P_i \\\\ \rm 98 = P_f-61.2 \\\\ P_f =159.2 \ Kg m/sec[/tex]
Hence, the final momentum will be 159.2 kg m/sec
To learn more about the momentum, refer to the link;
https://brainly.com/question/4956182
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4
Students are using an air rocket to investigate the relationship
between force and an object's motion.
Students pump air into the rocket, then release the rocket, and the
compressed air pushes the rocket upward.
A. The length of the hose attached to the pump
B. The distance traveled by the rocket
C. The amount of air pumped into the rocket
D. The height of the rocket from fins to cone
Two men push a bobsled with a total force of 250 Newtons. The
combined mass of the men and the bobsled is 230 kilograms.
Ignoring friction, what is the acceleration of the bobsled??(
F = ma)
Answer:
[tex]0.78m \: per {s}^{2} [/tex]
GIVING BRAINLIEST PLEASE HELP ME!!!
-If you answer correctly ill give you brainliest which will give you 25 points-
Answer:
Explanation:
1. Conduction
2. Convection
3. Radiation
please help me answer
D. 55 Kg mass moving at 1 m/s, is the correct answer.
The more mass the object has, the greater inertia is. It doesn't matter how fast the object is going because inertia is depended on mass.
Two train cars with the same mass (30,000 kg) are traveling in the same direction when they collide.
Train Car A has a velocity of 10 m/s and Train Car B has a velocity of 5 m/s. What is their total
momentum after the collision? Make sure to show all your work and include proper units.
Answer:
25
Explanation:
I just did this
Why does steam at 100°c give severe burn than water at 100 c?
Explanation:
Steam will produce more severe burns than boiling of water because steam has more heat energy than water due to its latent heat of vaporisation and additionally latent heat of condensation. Steam and boiling water can exist at varing temperature but it is only correct to assume here that both are at same temperature.
A jet plane travels east for
661.8 meters in 6 seconds.
What is the velocity of the plane?
velocity = distance = time
3,970.8
Explanation:
v=661.8×6
3,970.8
Please help!!!
The Ice cube melting on the conducting plate
What is the main type of thermal energy...
. Conduction
.Convection
. Radiation
Answer:
conduction, convection, and radiation
Explanation:
when you hold an ice cube, heat is transferred from your warm hand to the cold ice and melts it. Your hand feels cold because it is losing heat energy. There are three ways that heat can be transferred: by conduction, convection, and radiation. heat through solids.
Which type of wave would have the directions of motion shown below? Direction of Particle Vibration motion Direction of Wave O A. Transverse O B. Rarefaction O C. Longitudinal D. Compressional SUBMIT
Answer:
transverse
Explanation:
The motion shown in the diagram is of a) Transverse waves
What are Transverse waves ?Waves in which all the points on the wave oscillates along the paths at the right angle to the direction of the wave's motion are called transverse waves
It can be observed from the given figure that direction of wave is in positive x direction and direction of particle is in positive y direction , hence motion of particle is perpendicular to the direction of wave hence , it is a transverse waves
correct answer is a) Transverse
learn more about transverse waves
https://brainly.com/question/13863548?referrer=searchResults
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A student analyzes the data and concludes that one bird flies at a speed of 20 meters per second during a portion of its migration. Select the two types of data that the student needed to form this conclusion
Answer:
The answer is "The location of the bird and time interval between pieces of information".
Explanation:
Please find the complete question in the attached file.
The Radar is the instrument used to gather data from birds by researchers. This would be the primary tool to study the flight behavior of migrating birds with the impact of environmental influences including the ecology of migratory movements, from the broad population group for both the distribution of land areas and geomorphology as well as meteorological systems to the shift in the behavior of airlines of particular birds, especially when responding to lead routes.
Determine both the mass and the charge of a block of material consisting of 3 x 10^27 protons, 3 x 10^37 neutrons, and 3.1 x 10^27 electrons.
Answer:
The mass of the block of material is 3 x 10³⁷ g/mol
The charge of the material is 4.8 x 10⁸ C
Explanation:
Given;
number of protons of the material, P = 3 x 10²⁷
number of neutrons in the material, N = 3 x 10³⁷
number of electrons in the material, E = 3 x 10²⁷
The mass of the block of material is calculated as follows;
M = P + N
M = 3 x 10²⁷ + 3 x 10³⁷
M = 3 x 10³⁷ g/mol
The charge of the material is calculated as follows;
charge of 1 electron = 1.6 x 10⁻¹⁹ C
charge of 3 x 10²⁷ electrons = 3 x 10²⁷ electrons x 1.6 x 10⁻¹⁹ C
= 4.8 x 10⁸ C
35) Kinetic energy in flowing water drives
A watermill. B. windmill
to generate electricity.
C. turbines. D. generator
Answer:
C) Turbines
Explanation:
C. because as the water flows, its kinetic energy is used to turn a turbine.
Expresa en notación científica los siguientes números en notación científica estándar: a) 9367421= b) 7241= c) 0.0005519= d) 0.02=
Answer:
so yeah it is Respuesta
If an equation is balanced,it demonstrates the law of conservation of mass
True or False
Answer: True
Explanation:
Which statement best describes the difference between atoms and molecules
Answer:
Atom
It is a smallest component of element.
may or maynot have possessed.
Molecule
it is a group of two or more Atoms.
alway posses the properties of matter.
2. A hanging wind-chime on a calm day would have kinetic or potential energy?
kinetic
potential
Answer:
it would have potential energy