You are trying to get a sailboat to land on the shore. Do you think it would it be easier during the day or night and why?
Answer:
Day
Explanation:
Day because the tides wouldn't be as strong
Answer:night
Explanation:
high tide or whichever one is the tide closer to shore
Please help! I’m so confused and I’m being timed! I will give brainliest!
Answer:
Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. A rocket engine produces thrust through action and reaction. The engine produces hot exhaust gases which flow out of the back of the engine. In reaction, a thrusting force is produced in the opposite reaction.
A negative charge of - 0.0005 C exerts an attractive force of 7.0 N on a second charge that is 10 m away. What is the magnitude of the second charge?
Answer:
the magnitude of the second charge is 0.000156 C.
Explanation:
Given;
mangitude of the first charge, q₁ = 0.0005 C
attractive force between the two charges, F = 7.0 N
distance between the two charges, r = 10 m
let the magnitude of the second charge = q₂
The magnitude of the second charge is calculated by applying Coulomb's law;
[tex]F = \frac{kq_1q_2}{r^2}[/tex]
Where;
K is Coulomb's constant = 9 x 10⁹ Nm²/C²
[tex]q_2 = \frac{Fr^2}{kq_1} \\\\q_2 = \frac{7 \times \ 10^2}{(9\times 10^9)(0.0005)} \\\\q_2 = 0.000156 \ C[/tex]
Therefore, the magnitude of the second charge is 0.000156 C.
How much work is done when 300 N of force is used to lift the dog 1.5 m?
Answer:
450N
Explanation:
Work done=Force*distance
The downward force acting on an object in free fall is the force of ___________
You push down on a 3 N box for 5 minutes. How much work was done?
Answer:
none. 0. for work to be done the object has to have displacement, and even though you were exerting force, the box did not move and s work is o it could also be 50 but I'm sure it is 0
Explanation:
A pump is to lift 20.0 kg of water per minute through a height of 25.50 m. What output rating should the pump motor have?
Answer:
the output rating that should the pump motor have is 83.30 Watt
Explanation:
Given that
The pump lift 20 kg of water per minute having a height of 25.50 m
We need to find out the output rating that should the pump motor have
As we know that
power = energy ÷ time
= m g h ÷ t
= 20.0 × 9.8 × 25.50 ÷ 60
= 83.30 Watts
Hence, the output rating that should the pump motor have is 83.30 Watt
If you increase the frequency of a sound wave four times, what will happen to its speed?
A. The speed will increase four times.
B. The speed will decrease four times.
C. The speed will remain the same.
D. The speed will increase twice.
E. The speed will decrease twice.
Answer:
d
Explanation:
Electricity and magnetism are? Regulated by one force with positive and negative charges Two separate forces Both of the above
Answer:
two separate forces
Explanation:
Electricity and magnetism are two separate forces. However, they come together in a field called electromagnetism. Both types of forces are linked; a moving magnet may push electric charges and trigger electric current. Objects which have both positive and negative charges are mutually repulsive to each other, and those with opposite charges are mutually attractive.
Building a space station, in which astronauts would live for a considerable time, is essential even if the space station project were to contribute no new knowledge about space or Earth that could not otherwise be obtained. For future missions to explore Mars, we will need the medical knowledge that the space station project will give us about the limits of human capacities to live in spacecraft for an extended time.
The argument makes the assumption that
(A) the exploration of Mars will be carried out by people traveling in spacecraft and not by robots alone
(B) the capacities of astronauts are typical of those of ordinary human beings
(C) no unforeseen medical problems will arise on the first mission to explore Mars
(D) a mission to Mars will be the first of many missions that will explore the solar system
(E) living in spaceship for an extended time presents insurmountable medical problems
Answer:
The argument make the assumption that;
(A) The exploration of Mars will be carried out by people travelling in spacecraft and not by robots alone
Explanation:
The argument is made for the importance of a space station where astronauts live for an appreciable time to aid in the understanding of human capacities for living in the space so as to increase the successful space travel human to Mars, which is a distance further than the Moon and therefore, will require sufficient time travel
A plastic rod becomes negatively charged when it is rubbed with a piece of wool. How does the rod become charged?
Electrons move from the rod to the wool.
Protons move from the rod to the wool.
Electrons move from the wool to the rod.
Protons move from the wool to the rod.
Electrons move from the wool to the rod.
BEcause if they move from wool to rod, the rod has more number of electrons now. Hence making it negatively charged
The plastic rod becomes charged when electrons move from the wool to the rod to become negatively charged. Details about charge can be found below.
What is electronegativity?Electronegativity is the tendency, or a measure of the ability, of an atom or molecule to attract electrons and thus form bonds.
According to this question, a plastic rod becomes negatively charged when it is rubbed with a piece of wool.
An atom becomes negatively charged when it gains electrons from another atom, hence, it can be said that the plastic rod becomes charged when electrons move from the wool to the rod to become negatively charged.
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Reo performed an experiment to investigate the strength of an electromagnet and the amount of force that would be affected by the size of the current flowing through its coils. Which of the following changes would increase the current flow the most?
a. Decreasing the number of paper clips being picked up
b. Decreasing the number of coils of wire wrapped around the nail
c. Increasing the voltage power supply
d. Increasing the number of nails
(WILL GIVE BRAINLIEST)
Answer:
b. Decreasing the number of coils of wire wrapped around the nail
it can cause an electrical current running through it creates a magnetic field.
How is it possible a plant can sustain itself for 70 years locked inside a jar ?
Answer:
If you are talking about the experiment in which mouse and plants are kept in a closed glass jar in sunlight so in that case, they both survive because the CO2 released by the respiration of mouse is being utilized by the plants and fixed ( phosynthesis) and O2 is released as by product, which is taken by the mouse for respiration.
According to Hooke's law, the force exerted by a compressed or stretched spring is proportional to...
Answer:
Hooke's law can be written as:
F = -k*Δx
Where k is a constant that depends on the spring, called the spring constant.
And Δx = (x - x₀) is the displacement of the spring with respect to the rest position x₀
And a proportional equation is something like:
y = c*x
Where c is a constant of proportionality.
In the case of Hooke's law, the constant is K, then the force is proportional to the displacement of the spring with respect to the rest position Δx.
If a body is thrown up with an initial velocity 'u' and covers a maximum height of 'h' , then 'h' is equal to u²/2g
Explain in detail.
Answer:
1/2 m u^2 initial Kinetic Energy of body
m g h Potential Energy body attains as it rises to height
1/2 m u^2 = m g h conversion of KE to PE
h = u^2 / ( 2 g)
Calcula la cantidad de calor que hay que darle a 0,01 l de mercurio para que su temperatura pase de 10 ºC a 25 ºC. Datos: rho=13,6 g/cm3 ; Ar(Hg)=200,6; C=28,1 J/(mol∙K).
Respuesta:
286 J
Explicación:
Paso 1: Convertir 0,01 L de Hg a cm³
Usaremos los siguientes factores de conversion.
1 L = 1000 mL
1 mL = 1 cm³
0,01 L × 1000 mL/1 L × 1 cm³/1 mL = 10 cm³
Paso 2: Calcular la masa (m) correspondiente a 10 cm³ de Hg
La densidad de Hg es 13,6 g/cm³.
10 cm³ × 13,6 g/cm³ = 136 g
Paso 3: Calcular los moles(n) correspondientes a 136 g de Hg
La masa molar de Hg es 200,6 g/mol.
136 g × 1 mol/200,6 g = 0,678 mol
Paso 4: Calcular la cantidad de calor requerido (Q)
Usaremos la siguiente fórmula.
Q = c × n × (T₂ - T₁)
donde,
c: calor específico del Hg (28,1 J/mol.K = 28,1 J/mol.K)
T₂ y T₁: temperaturas final e inicial, respectivamente
Q = (28,1 J/mol.°C) × 0,678 mol × (25°C - 10 °C) = 286 J
PLEASE HELP ME
Which refers to the amount of energy in a sound wave per unit of time and is also related to the loudness of a sound? period compression amplitude intensity
Answer: Thanks for the points!
Explanation: The average amount of energy passing through a unit area per unit of time in a specified direction is called the intensity of the wave. As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder.
Answer:
Amplitude
Explanation:
Find the formula and scientific units of the following:
Speed =
Velocity =
Momentum =
Velocity =
Acceleration =
Force =
Answer:
speed :m/s
velocity:m/s-¹
acceleration:m/s²
force:kgms-²
Explanation:
I hope May be correct
Speed: It is the rate at which object covers or travelled particular distance or rate at which objects changes its position. S.I. unit for speed is metre per second (m/s).
Speed (s) = distance (d) / time (t)
Velocity: Distance covered by a moving object in a particular direction per unit time. S.I. unit of velocity is m s-1 or m/s.
Velocity (v) = Total displacement (d) / time take(t)
Momentum: It is quanity of motion of the object. S.I. Unit is Kg.m.s-1
Momentum (p) = Mass (m) X Velocity (v)
Acceleration: Rate at which an object velocity changes with respect to time. S.I. unit is metres/second2 (m/s2) Acceleration (a) = Change in velocity/ time taken
Force: When an object changes it position or direction due to external agent. S.I. unit of force is (Kg m/s2).
Force (F) = Mass(m) × Acceleration (a)
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A student pushes a box to the right with a force of 10 N. At the same time, another
student pushes the same box to the left with a force of 5N.
What is the net force
Answer:
5 N
Explanation:
To find the net force of 2 objects pushing against each other you subtract them and that’s how you get your answer.
The net force acting on a system is defined as the resultant of all the force acting on all the body. The value of net force will be 5N.
What is force?Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body. Force is defined as the product of mass and acceleration. Its unit is Newton.
The given data in the problem will be;
F₁ is the force act to the right = 10 N
F₂ is the force act to the left= 5N
F is the net force=?
According to the equilibrium concept, the net force acting on the body is equal to zero.
F = F₁ - F₂
F = 10-5
F = 5N
Hence the value of net force will be 5N.
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A step down transformer has a primary coil consisting of 700 tons and a secondary coil consisting of 300 times. What is the potential difference in the second circuit, if the primary coil is supplied with an effective AC potential difference of 110 V?
Answer is 47.14 v
by the relation
[tex]\frac{V out}{V in } = \frac{N secondary}{N primary }[/tex]
A 20.0 Ohm and 60.0 Ohm resistor
are connected in series to a 9.00 V
battery. What is their equivalent
resistance?
(Unit = Ohms)
Answer:
for resistors in series, add the resistances to get their equivalence. The answer is
80.0 Ohms
If the battery has a voltage of 24 Volts, Find the current when switch is closed.
Answer:
6amps
Explanation:
The question is not complete
Given data
voltage= 24volts
Say we have a resistance of 4 ohms
We can then find the current using the formula
V= IR
substitute
24= I*4
I= 24/4
I= 6 amps
Hence the current when the voltage is 24volt and a resistance of 4 ohms is
6amps
What was your hypothesis? According to your data, do you think your hypothesis was correct? (Be sure to refer to your data and graph in answering this question.)
Summarize any difficulties or problems you had in performing this experiment that might have affected the results. Describe how you might change the procedure to avoid these problems.
Explain how a graphical analysis can be used to explore the relationship between any two scientific variables.
Answer:
Present Your Findings Write a summary paragraph discussing this experiment and the results. Use the following questions and topics to help guide the content ...
A 2400W electric toaster is connected to a standard 120 V wall outlet. A family
measured their monthly toaster usage to be 6.5 hrs.
6
1) How much electrical energy (in kilowatt hours - kWh) did the toaster dissipate
during the measured month? (round to 1 decimal place & do not include units)
2) If the local power company charges $0.13/kWh, then calculate (in $) the monthly
total cost of this toaster. (round to 2 decimals & do not include units)
Answer:
1) 15.6
2) 2.03
Explanation:
The power output of the electric toaster, P = 2,400 W
The voltage rating of the power outlet, V = 120 V
The number of hours the toaster is used during a month = 6.5 hours
1) Electrical energy, E = Electrical power, P × Time, t
The electrical energy dissipated by the toaster, 'E', is given as follows;
E = 2,400 W × 6.5 hrs = 15,600 Wh = 15.6 kWh
The electrical energy dissipated by the toaster, during the measured month in kWh, E = 15.6
2) Let 'C' represent the monthly cost of toaster and let 'B' represent the amount charged by the local power company, we have;
The charges for (electrical) power by the local power company, B = $0.13/kWh
The monthly cost of the toaster, C = E × B
∴ C = 15.6 kWh × $0.13/kWh = $2.028
By rounding off to 2 decimals, the monthly cost of the toaster (in $), C ≈ 2.03.
Every chemical compound is unique and different from the ____________________ it contains.
a.
molecules
c.
elements
b.
hydrogen
d.
gas
Answer:
C is your answer fam.
Explanation:
define the natural fibre
Natural fibers or natural fibres are fibers that are produced by plants, animals, and geological processes. They can be used as a component of composite materials, where the orientation of fibers impacts the properties. Natural fibers can also be matted into sheets to make paper or felt.
An electromagnet is a device that uses an electric current to produce a magnetic field.
Electromagnets are typically composed of a piece of metal wrapped with wire and connected to a battery. The battery provides the electric current, and the loops or coils of wire enhance the magnetic field. The more loops there are, the stronger the magnetic field.
When electric current flows through the electromagnet, the metal core becomes magnetized, so it possesses a north pole and a south pole.
Motors place electromagnets inside of permanent magnets as shown below.
However, motors are designed so that the polarity of the electromagnet constantly flips. That is, the north pole becomes the south pole, and the south pole becomes the north pole, every time the electromagnet turns 180 degrees.
Why is it designed this way?
A.
to conserve the energy in the battery
B.
to constantly polarize the field magnet
C.
so the electromagnet will continuously turn
D.
so the magnetic field will get stronger
The reason why motors are designed so that the polarity of the electromagnet constantly flips.is
C. so the electromagnet will continuously turn
Why is motor designed that wayThe reason motors are designed so that the polarity of the electromagnet constantly flips is to continuously turn the electromagnet. This allows the motor to rotate continuously, rather than becoming stuck in one position.
The flipping of the polarity causes the electromagnet to attract and repel from the permanent magnets, creating a rotating motion.
Therefore, the correct answer is C.
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¿Qué pasa en nuestro cerebro cuando tomamos decisiones? Ejemplo: Estoy tocando una plancha caliente, y saco la mano rápidamente, ¿que paso en mi cerebro?
Answer:
Debido a la información de las neuronas sensoriales al cerebro.
Explicación:
Cuando toco una plancha caliente, extiendo la mano rápidamente porque las neuronas sensoriales presentes en la piel de nuestro cuerpo envían señales al sistema nervioso central, es decir, al cerebro. El cerebro toma decisiones de acuerdo con los estímulos y envía instrucciones a través de las neuronas motoras a los músculos para retirar las manos del hierro caliente a fin de evitar efectos nocivos en la piel debido al calor. El lóbulo frontal es una parte del cerebro que controla la personalidad, la toma de decisiones y el razonamiento.
True or false blood gets oxygen and releases carbon dioxide in the heart
Answer:
FALSE
Explanation:
You breath in oxygen and your blood takes it through your body then you breath it out as carbon dioxide
A turtle swimming in a straight line toward shore has a speed of 0.50 m/sec. After 4.0 seconds, its speed is at 0.90 m/sec. What is the turtle's acceleration?
Answer:
0.1m/s²
Explanation:
Using the equation of motion
V = u+at
V is the final speed = 0.9m/s
Initial speed u = 0.5m/s
Time = 4secs
Get the acceleration
0.9 = 0 5+4a
0.9-0.5 = 4a
0.4 = 4a
a = 0.4/4
a = 0.1m/s²
Hence the acceleration is 0.1m/s²