Answer:
The answer is 2.7 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
volume = final volume of water - initial volume of water
volume = 13.5 - 10.5 = 3 mL
From the question we have
[tex]density = \frac{8.1}{3} \\ [/tex]
We have the final answer as
2.7 g/mLHope this helps you
A crate is being pushed with a force of 75 N, if the resulting acceleration of the crate is 3 m/s? what is the
mass of the crate?
Answer:
The answer is 15 kgExplanation:
The mass of the crate can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{75}{3} \\ [/tex]
We have the final answer as
15 kgHope this helps you
A scientific
a. theory
b. law
is a rule used to describe a pattern seen in nature, not an explanation of why that pattern might occur.
C. system
d. sequence
Please select the best answer from the choices provided
Ο Α
О В
О с
OD
a scientific LAW is the answer
Explanation:
a scientific law is the rule that nature runs by.
The frictional force on moving Toyota Prius is - 259.7 N. Using the calculated net force from problem 4, determine the force of the engine needed to cause the acceleration. Show your work.
Complete Question
The frictional force of moving Toyota Prius was given as - 259.7 N. net force was 795 N and determined the force of the engine needed to cause the acceleration
Answer:
The value is [tex]F_e = 1054.7 \ N[/tex]
Explanation:
From the question we are told that
The frictional force is [tex]F_f = -259.7 \ N[/tex]
The net force is [tex]F_{net} = 795 \ N[/tex]
Generally the net force is mathematically represented as
[tex]F_{net} = F_e - F_f[/tex]
=> [tex]F_e = F_{net} - F_f[/tex]
=> [tex]F_e = 795 - [-259.7][/tex]
=> [tex]F_e = 1054.7 \ N[/tex]
On release 1, a student releases a cart from the top of a ramp, such that the cart travels 190cm before hitting the stopper. The cart increases speed steadily and reaches the bottom of the ramp in 4.00s. What was the magnitude of the cart's acceleration on release 1?
Answer:
0.2375m/s²
Explanation:
Given
S = 190cm = 1.9m
initial velocity u = 0m/s
Time t = 4.00s
Required
acceleration
Using the equation of motion
S = ut + 1/2at²
Substitute
1.9 = 0+1/2a(4)²
1.9 = 8a
a = 1.9/8
a = 0.2375m/s²
The magnitude of the cart's acceleration is 0.2375m/s²
4 facts about light waves
How many peanut butter cups does Benny have if he has 2 times as many as Karen. Karen has 80 peanut butter cups.
Answer:
160 peanut butter cups
Explanation:
80 * 2 = 160
Answer:
160
Explanation:
if benny has 2x more than karen and karen has 80 you would multiply 80 by 2 to get 160. therefore benny has 160. hope that helps
There are 3 batteries in a series circuit, each containing 9V, and the total current is 1.5 A. Along the circuit is 4 resistors. The first is 3 ohms, the second is 6 ohms, the third is unknown, and the fourth is 5 ohms. What is the voltage drop across the unknown resistor
Answer:
The voltage drop across the unknown resistor is 6 volts.
Explanation:
Given;
the current flowing in the series circuit, I = 1.5 A
number of batteries in the series circuit, = 3
voltage in each battery = 9V
total voltage in the circuit, 3 x 9V = 27 V
number of resistor in the circuit, = 4
R₁ = 3 ohms
R₂ = 6 ohms
R₃ = ?
R₄ = 5 ohms
Determine the total resistance in the circuit by applying Ohms law;
V = IR
R = V / I
R = 27 / 1.5
R = 18 ohms
Determine the unknown resistance;
R₁ + R₂ + R₃ + R₄ = 18 ohms
3 + 6 + R₃ + 5 = 18
R₃ = 18 - 14
R₃ = 4 ohms
The voltage drop across the unknown resistor (R₃ = 4 ohms);
V₃ = IR₃
V₃ = 1.5 x 4
V₃ = 6 volts.
Therefore, the voltage drop across the unknown resistor is 6 volts.
does anybody know?? Please help
Mousa builds a bike ramp at 22 degrees that allows him to just barely jump his bike across a 5 m wide stream in the local neighborhood. Bilyan wants to replicate Mousa’s jump by building his own ramp, but at a different angle. At what angle should Bilyan construct his ramp?
A.
44 degrees
B.
11 degrees
C.
78 degrees
D.
68 degrees
Obtain 5 pennies. Line up 3 pennies touching in a perfect line. Line up 2 more pennies touching each other in perfect line with the other 3 pennies. Leave some space between the groups of pennies. Place your fingers onto the 2 slider pennies. Slide the 2 pennies into the group of 3. This may take practice to slide them correctly. Record what happens to the pennies after collision.
Answer:
Two other pennies will be launched, resting only 3 pennies left.
Explanation:
Take "o" as a pennie.
ooo oo
ooo ← oo
ooooo
oo ← ooo
The process is very similar to what occurs with the pendulum of newton by the law or principle of energy conservation.
In physics, the law or principle of energy conservation states that the total amount of energy in an isolated system remains constant. Such a principle is closely linked to the very definition of energy. An informal way of enunciating this law is to say that energy cannot be created or destroyed: energy can only be transformed from one type to another. The energy from the two pennies will be transferred to the other two pennies from the edge, the energy is then transformed into a kinetic move again.
You are writing a story on a table. What physical properties would you want your table to have?
Answer:The Table should be smooth, hard, and large
Explanation:
What shape must you make with a wire in a circut to have that current generate a magnetic field that is identical to the magnetic field produced by a normal bar magnet?
a
A straight line
b
An oval
c
A square
d
A coil
Answer:
The correct option is;
d. A coil
Explanation:
When a wire, which is an electric conductor is formed into the shape of a coil, and current is allowed to flow through the wire coil, a magnetic field is generated
The magnetic field generated by the electromagnetic coil has direction that consists of flux emanating from one end of the coil and entering the coil from the other end, similar to that of the magnetic field produced by a normal bar magnet.
Answer:
The maximum speed an object can fall in the presence of air resistance
Newton's third law
A coil
While hiking in the mountains, you see a mountain lion. If you were to react as the Cannon–Bard theory of emotions proposes, which sequence of events would characterize your response? Group of answer choices You would experience physiological changes and a feeling of fear simultaneously. You would feel fear followed by physiological changes. You would experience physiological changes followed by fear. You would experience physiological changes and context appraisal followed by fear
Answer:
You would experience physiological changes and a feeling of fear simultaneously.
Explanation:
Cannon–Bard theory of emotions can as well be regarded as Thalamic theory of emotion, whenever the body experience a stimuli, a message will be sent to the brain by the Thalamus then there will be emotions as a result of this a physiological reaction such as trembling, sweating and others would follows. The theory stressed that physical reaction doesn't depends on emotional reaction.
In the case of hiking in the mountains, and one see a mountain lion. If one were to react as the Cannon–Bard theory of emotions proposes, the sequence of events that would characterize One's response is one would experience physiological changes and a feeling of fear, because a message is send to the brain by the Thalamus, then emotion set in and physiological reaction, which explains Cannon–Bard theory.
what are these things called
An object is moving to the left. In which direction would a force need to be exerted to make this object slow down?
Answer:
left
Explanation:
When a force is applied in the opposite direction of motion, it opposes the motion of the object, causing its speed to decrease.
What is force?A force is an influence in physics that can change the motion of an object. A force can cause a mass object to change its velocity, or accelerate.
Intuitively, force can be described as a push or a pull. A force is basically a vector quantity as it has both magnitude and direction.
The term "force" has a specific meaning in science. At this level, it is perfectly acceptable to refer to a force as a push or a pull.
Another object applies a force to another. The concept of a force is not restricted to living or non-living things.
To slow a moving object, apply force in the opposite direction to the direction of motion.
Thus, the force should be applied from left to slow down the object.
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If the coefficient of sliding friction between a 25 kg crate and the floor is 0.45, how much force is required to move the crate at a constant velocity across the floor?
At constant velocity, the crate would be in equilibrium, so that Newton's second law tells us
p + (-f ) = 0
where p and f denote the magnitudes of the added pushing force and friction force, respectively.
The friction force is proportional to the normal force by a factor of µ, the coefficient of friction. There's no vertical movement going on, so Newton's second law says
n + (-w) = 0
where n and w are the magnitude of the normal force and the weight of the crate, respectively.
Compute n :
n = w = (25 kg) (9.80 m/s²) = 245 N
Use this and µ = 0.45 to compute f :
f = µ n = 0.45 (245 N) = 110.25 N
Solve for p :
p + (-110.25 N) = 0
p = 110.25 N ≈ 110 N
The force i.e required to move the crate at a constant velocity across the floor is 110 N.
At the same velocity, the crate should be in equilibrium, so as per Newton's second law, the following formula should be used:
p + (-f ) = 0
p means the magnitudes of the added pushing force
f means the friction force
Calculation of the force:
n = w = (25 kg) (9.80 m/s²) = 245 N
Now
force should be
= µ n
= 0.45 (245 N)
= 110.25 N
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(a) Write down the Bernoulli's Equation and continuity Equation for a pipe flow and define each term in the equation. (b) The closed tank of a fire engine is partly filled with water, the air space above being under pressure. A 6 cm bore connected to the tank discharges on the roof of a building 2.5 m above the level of water in the tank. The friction losses are of 45 cm of water. Determine the air pressure which must be maintained in the tank to deliver 20 litres/sec on the roof.
Answer:
A) [tex]\frac{P}{p} + \frac{1}{2} v^2 + gh = k\\[/tex]
B ) 53.9 kN/m^2
Explanation:
a) Bernoulli's equation and continuity equation for a pipe flow
[tex]\frac{P}{p} + \frac{1}{2} v^2 + gh = k[/tex]
[tex]\frac{P}{p}[/tex] = pressure head
[tex]\frac{1}{2}v^2[/tex] = velocity head
gh = potential head
k = constant
p = density
b) determine the air pressure that must be maintained
Given data :
Discharge rate( R ) = 20 liters/sec ≈ 0.02 m^3
Bore diameter ( d ) = 0.06 m
first we calculate the velocity in the 6 cm bore
v = [tex]\frac{R }{\frac{\pi }{4} *d^2}[/tex] ------- (2)
R = 0.02
d = 0.06
insert the given values into equation 2
V = 7.07 m/s
next we apply the Bernoulli's equation by rewriting it as follows
[tex]\frac{P}{pg} + \frac{1}{2g} v^2 + h = k[/tex]
[tex]\frac{1}{2g}v^2[/tex] ( velocity head ) = [tex]\frac{7.07^2}{2*9.81}[/tex] = 2.55
next we will apply the use of energy conservation law on the surface of water in tank and that on the roof :
Note : H1(frictional head loss ) = 45cm = 0.45 m , g = 9.81
applying the energy conservation law
[tex]\frac{P1}{pg} + \frac{1}{2g} v_{1} ^2 + h1 =[/tex] [tex]\frac{P2}{pg} + \frac{1}{2g} v_{2} ^2 + h2[/tex]
[tex]\frac{P1}{pg}[/tex] = 0 + 2.55 + 2.5 + 0.45
therefore ; P1 = 9.81 * 5.55 = 53.9 kN/m^2
El elevador hidráulico de un garaje funciona mediante una prensa hidráulica conectada a una toma de agua de la red urbana que llega a la máquina con una presión de 5x10 5 N/m 2 . Si el radio del émbolo es de 20 cm y el rendimiento es de un 90% ¿Cuál es el valor en toneladas de la carga que como máximo puede levantar el elevador.
Answer:
El elevador puede levantar 5.76 toneladas de carga máxima.
Explanation:
De acuerdo a la ley de Pascal:
[tex] p_{1} = p_{2} [/tex]
[tex] \frac{F_{1}}{A_{1}} = \frac{F_{2}}{A_{2}} [/tex] (1)
En donde:
F: es la fuerza
P: es la presión
A: es el área
Sabiend que p₁ = 5x10⁵ N/m², tenemos que F₂ es:
[tex] F_{2} = p_{1}A_{2} [/tex] (2)
El área del embolo viene dada por el área de una circunferencia:
[tex] A_{2} = \pi r^{2} [/tex] (3)
Introduciendo la ecuación (3) en la ecuación (2) tenemos:
[tex] F_{2} = p_{1}\pi r^{2} = 5 \cdot 10^{5} N/m^{2} \pi (0.20 m)^{2} = 62832 N [/tex]
Dado que el rendimiento es del 90%, la fuerza máxima es:
[tex] F_{2} = 62832 N*0.90 = 56549 N [/tex]
Ahora sabemos que la fuerza del elevador para levantar la carga máxima es 56549 N y para encontrar el valor de toneladas de la carga máxima que puede levantar el elevador, debemos encontar la fuerza necesaria para levantar 1 tonelada:
[tex] F = mg = 1000 kg*9.81 m/s^{2} = 9810 N [/tex]
Finalmente, si para levantar 1 tonelada se debe aplicar una fuerza de 9810 N, y la fuerza total es igual a 56549 N, el numero de toneladas que puede levantar el elevador es:
[tex] N = \frac{F_{2}* 1 ton}{F} = \frac{56549 N* 1 ton}{9810 N} = 5.76 ton [/tex]
Por lo tanto, el elevador puede levantar 5.76 toneladas de carga máxima.
Espero que te sea de utilidad!
How does the sun works
Answer:
The sun works by nuclear fission, because there is so much pressure, it makes it vErY hOt. ( About 10,340 degrees Fahrenheit to be exact, or 5,726 degrees Celsius* )
Explanation:
Hope this helps! <3
help pls ill give points
Answer:
The answer Is erosion!
Hope you do Great!
Explanation:
Answer:
weathering
Explanation:
An elephant walks due east for a distance of 7.9 km, turns around and then goes due west for 1.9 km, and finally turns around again and heads 3.6 km due east. What is the displacement traveled by the elephant in meters?
Answer:
The displacement traveled by the elephant is 9600 east
Explanation:
Displacement is defined as an object's change in position which is given by the difference between final and initial location of the object
The displacement of the elephant are, taking east as positive direction of motion;
1) 7.9 km east = + 7.9 km
2) 1.9 km west = -1.9 km
3) 3.6 km east = 3.6 km
The net (sum) displacement of the elephant, ∑Δx is given as follows;
∑Δx = 7.9 km - 1.6 km + 3.6 km = 9.6 km
Given that the sum of the displacement is positive and that 9.6 km = 9600 m, we have;
The displacement traveled by the elephant = ∑Δx = 9600 east.
PLEASE HELP ME!
Which statement about nuclear reactions is NOT true?
a.
Nuclear power plants use fission of uranium.
b.
In fission, the total mass of the reactants equals the total mass of the products.
c.
In fission, nuclei are split, and in fusion, nuclei are combined.
d.
Energy as heat and light in the sun are generated by hydrogen fusion reactions.
Answer:
b. In fission, the total mass of the reactants equals the total mass of the products.
Explanation:
In a nuclear reaction, the total mass of the reactants does not equal to the total mass of the products.
This is because mass is converted to energy in a nuclear reaction.
It is true that nuclear power plants use fission. Uranium is the fuel in most reactors used to generate electricity. During nuclear fission, an unstable nucleus is split and in fusion, atoms are combined together. Heat and light is produced in the sun which are generated by hydrogen fusion reactions.Is the moon accelerating?
Answer:
The Earth's gravity keeps the Moon orbiting us. ... This means gravity makes the Moon accelerate all the time, even though its speed remains constant.
A pitcher throws a baseball horizontally with a speed of 42 m/s. If the pitcher throws the baseball from a height of 1.25 meters, what is the resultant velocity of the ball right before it hits the ground? Include direction (angle).
Answer:
v = 42.28 m/s
Explanation:
It is given that,
The horizontal speed of a baseball, [tex]u_x=42\ m/s[/tex]
The pitcher throws the baseball from a height of 1.25 meters, h = 1.25 m
Firstly finding t i.e. the stone takes to reach the ground. Using second equation of motion as follows :
[tex]d=ut+\dfrac{1}{2}at^2[/tex]
a = -g and u = 0
[tex]d=-\dfrac{1}{2}gt^2\\\\t=\sqrt{\dfrac{-2d}{g}} \\\\t=\sqrt{\dfrac{-2\times 1.25}{9.8}} \\\\t=0.5\ s[/tex]
Vertical component of the velocity is :
[tex]v_y=gt\\\\v_y=9.8\times 0.5\\\\v_y=4.9\ m/s[/tex]
Resultant velocity,
[tex]v=\sqrt{v_x^2+v_y^2} \\\\v=\sqrt{42^2+4.9^2} \\\\v=42.28\ m/s[/tex]
So, the resultant velocity of the ball before it hits the ground is 42.28 m/s.
Answer:
42.28 m/s
Explanation:
If the deflection of a spring is doubled, then how much does the force change?
Answer:
The force is doubled as well.
Explanation:
If you double the spring then the force doubles as well.
If the deflection of the spring is doubled, the force exerted by the spring will also be doubled.
What is the Hooke's Law?The relationship between the deflection of a spring and the force it exerts is described by Hooke's Law, which states that the force exerted by a spring is directly proportional to its deflection. Mathematically, this can be expressed as:
F = kx
where F is the force exerted by the spring, x is the deflection of the spring, and k is the spring constant, which represents the stiffness of the spring.
If we double the deflection of the spring, then x becomes 2x, and the force exerted by the spring becomes:
F = k(2x) = 2kx
Thus, if the deflection of the spring is doubled, the force exerted by the spring will also be doubled (assuming the spring constant remains constant).
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If two objects crash into each other, what happens? Are both objects affected? How? If you can, give an example to support your ideas.
If two objects crash into each other, they experience collision and both bodies are affected.
Two bodies are said to collide if they hit or crash into each other.
Hence when two objects crash into each other;
collision occursThere is a release of energy due to this collisionOne of the objects tends to gain momentum or speed while the other object loses momentum.For example, two rolling objects going in opposite directions when they hit each other tens to experience a collision.
Hence we can conclude that if two objects crash into each other, they experience collision and both bodies are affected.
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A race car accelerates uniformly from 19.5 m/s to 50.1 m/s in 2.47 seconds. Determine
the acceleration of the car and the distance traveled.
Answer:
12.4m/s²; 80.99m
Explanation:
Acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time. Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.
Mathematically, acceleration is given by the equation;
[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]
Given the following data;
Initial velocity = 19.5m/s
Final velocity = 50.1m/s
Time = 2.47 secs
Substituting into the equation;
[tex]a = \frac{50.1 - 19.5}{2.47}[/tex]
[tex]a = \frac{30.6}{2.47}[/tex]
Acceleration, a = 12.4m/s²
Solving for the distance covered;
[tex] S = ut + \frac {1}{2}at^{2}[/tex]
Substituting into the values into the equation;
[tex] S = 19.5(2.47) + \frac {1}{2}(12.4)(2.47)^{2}[/tex]
[tex] S = 48.165 + 6.2 *6.1009[/tex]
[tex] S = 48.165 + 32.8256[/tex]
S = 80.99m
If a car moves with a constant acceleration, can you conclude that there are no forces acting on it?
Which combination of processes from the water cycle is most likely to cause flooding? low runoff, low evaporation high runoff, high precipitation high runoff, low precipitation low runoff, high condensation
Answer:
High run off, low evaporation
Explanation:
High run off and low evaporation causes flood because if evaporation is low, there won't be changing of liquid water to gas or vapor meaning water will be in abundance and if there is much water in abundance it can lead to flooding. High run off can result in flooding if rainfall water overwhelm the capacity of the drainage system i.e the water is more than what the drainage system can carry, it can result in flooding.
Answer:
high runoff, low evaporation, low precipitation
Explanation:
High run off and low evaporation causes flood because if evaporation is low, there won't be changing of liquid water to gas or vapor meaning water will be in abundance and if there is much water in abundance it can lead to flooding. High run off can result in flooding if rainfall water overwhelm the capacity of the drainage system i.e the water is more than what the drainage system can carry, it can result in flooding.
Michael is training to join the Army and runs to the left with a constant
velocity of 2 m/s. If he starts at Om, what is his position after 5 seconds?
Don't forget units and directions if appropriate.
Your answer
Answer:
[tex]10 \: m.[/tex]
Explanation:
[tex]his \: position \:is \: his \: distance \: from \: the \: \\ point \: of \: motion \: and \: is \: given \: by : \\ v = \frac{s}{t} \\ s = vt =2 \times 5 \\ s = 10 \: m.[/tex]