Answer:
Explanation:
Using the equation of motion
V² = u²+2g∆H
v is the final velocity
u is the initial velocity = 0m/s
g = 9.8m/s²
∆H = 12.7-1.5 = 11.2m
Substitute
v² =0²+2(9.8)(11.2)
v² = 219.52
v = √219.52
v = 14.82m/s
Hence the final.speed of the ball is 14.82m/s
A child pulls on a toy locomotive of mass 0.979 kg with a force of 3.25 N to the right. The locomotive is connected to two train cars by cables. Friction in the axles results in an effective coefficient of kinetic friction between the floor and the train which is 0.110. One car has a mass of 0.952 kg and the other has a mass of 0.419 kg.
What is the acceleration of the train?
What is the tension in the cable between the locomotive and the car connected to the locomotive?
Hints: For part (a), consider the locomotive and the 2 cars to be one “object”.
For part (b). consider the “object” to be the 2 cars.
Answer:
(a) The acceleration of the train and cars is approximately 0.304 m/s²
(b) The tension between the locomotive and the car connected to the locomotive is approximately 0.4166 N
Explanation:
The given parameter are;
The mass of the toy locomotive = 0.979 kg
The mass of one car = 0.952 kg
The mass of the other car = 0.419 kg
The total mass of the train locomotive and cars = 0.979 + 0.952 + 0.419 = 2.35 kg
The weight of the train locomotive and cars = 9.81 m/s² × 2.35 kg = 23.0535 N
The normal force of the train and cars = The weight of the train locomotive and cars = 23.0535 N
The coefficient of dynamic friction = The normal force × The coefficient of dynamic friction
The coefficient of dynamic friction = 23.0535 × 0.110 = 2.535885 N
The applied force = 3.25
The net force acting on the train locomotive and cars = 3.25 - 2.535885 0.714115 N
(a) Force = Mass × Acceleration
Acceleration = Force/Mass
∴ The acceleration of the train and cars = 0.714115 N/(2.35 kg) ≈ 0.304 m/s²
(b) The tension between the locomotive and the car connected to the locomotive = T₂ = ( (m₁ + m₂)/ (m₁ + m₂ + m₃)) × F
Therefore, T₂ = ( (0.952 + 0.419)/ (0.952 + 0.419 + 0.979)) × 0.714115 ≈ 0.4166 N.
A standard baseball has a mass of 145 g. What is the weight of a standard baseball?
Answer: 1.42 N
Explanation:
Just took
How to calculate maximum height, when i know only V
Pleeeaaassseee as fast as you can
Answer: was it this problem?
Explanation:
Un objeto que es empujado sobre una superficie plana, tiene una masa de 80 kg y dicha fuerza tiene un valor de 300 N. Calcule la fuerza Normal y la fuerza de Fricción para que este en equilibrio. A. Ff=300 N N=784.8 N B. Ff=300 N N=780 N C. Ff=200 N N=750 N AYUDENME POR FA LA NECESITO
Responder:
A. Ff = 300 N N = 784,8 N
Explicación:
Dado
Masa del cuerpo = 80 kg
Fuerza de movimiento Fm = 300N
Dado que el cuerpo no está acelerando, la fuerza de fricción (Ff) es igual a la fuerza de movimiento que actúa sobre el cuerpo, ya que la fuerza de fricción es una fuerza de oposición, es decir, Fm = Ff
Dado que Fm = 300N, Ff = 300N
La reacción normal que actúa en el cuerpo es igual al peso.
N = W = mg
g es la aceleración debida a la gravedad
g = 9,8 m / s
N = mg
N = 80 (9,81)
N = 784,8N
Por tanto, la fuerza normal que actúa sobre el cuerpo es 784,8 N
3. A runner moving at a speed of 8.8m/s rounds a bend of radius 25m. Find the centripetal force of the 700N runner.
Answer:
Explanation:
Centripetal force is expressed as;
F = mv²/r
m is the mass = 700/10 = 70kg
v = 8.8m/s
r = 25m
Required
Centripetal force
Substitute the given parameters into the formula;
F = 70*8.8²/25
F = 70 * 77.44/25
F = 5420.8/25
F = 216.832N
Hence the centripetal force of the runner is 216.832N
Un auto parte desde un lugar a las 6:00 de la mañana con una rapidez de 150 Km/hr a través de una carretera recta. a) ¿Qué distancia habrá recorrido a las 10:00 de la mañana? b) ¿A qué hora habrá recorrido 900 Km?
Answer:
600 km
6 hours
Explanation:
El tiempo que viaja el automóvil de 6 a 10 de la mañana es [tex]10-6=4\ \text{horas}[/tex]
La velocidad del coche es 150 km/hr
La distancia está dada por
[tex]\text{Distancia}=\text{Velocidad}\times \text{Tiempo}[/tex]
[tex]150\times 4=600\ \text{km}[/tex]
A distancia recorrida a las 10 de la mañana es de 600 km.
Ahora el tiempo que se toma está dado por
[tex]\text{Tiempo}=\dfrac{\text{Distancia}}{\text{Velocidad}}[/tex]
[tex]\dfrac{900}{150}=6\ \text{horas}[/tex]
El tiempo que se tarda en recorrer 900 km es de 6 horas.
Help me with this please!
Answer:
b i. The curve would be less steep than both of the graphs.
c. The temperature was the same at the start of the experiment so that the only variable changed in the experiment would be the thickness of the walls and the change in temperature can be measured from the same starting temperature, ensuring a fair experiment.
Explanation:
b i. Since you know that a thicker wall conducts heat from the inside room to the surroundings slower (based on my previous answer ;)), heat from the room would be conducted to the surroundings by the thicker wall slower and the temperature change will be less drastic and the graph would be less steep.
c. In an experiment, only one independent variable can be changed and we would normally record the dependent variable to get a conclusion for the experiment as the dependent variable is the variable that is affected by the independent variable. We should not change any other variable in the experiment, such as the starting temperature of the experiment.
For e.g. If you want to find out how the amount of water affects a plant's growth, the amount of water would be the independent variable and that would be the only thing you would change in that experiment. During the experiment, you would record the dependent variable, which is the height of the plant. The type of plants used and the type of soil..etc should be kept the same/constant so that it is a fair experiment, as a better type of soil may make the plant grow taller.
What effect do you think thermal energy and the transfer of heat in Earth’s interior have on the surface of the planet?
A.
They cause the seasons to change.
B.
They cause the plates to move around.
C.
They cause the average global temperature to rise.
Answer:
C
Explanation:
The sun's radiation strikes the ground, thus warming the rocks. As the rock's temperature rises due to conduction, heat energy is released into the atmosphere, forming a bubble of air which is warmer than the surrounding air. This bubble of air rises into the atmosphere.
Answer:
A
Explanation:
It’s cold in the winter
hot in the summer
and in spring it’s warm
What is the speed of gravity on Earth?
(Free question if your learning physics!)
Answer:
25038.72 mph (filler please ignore)
Answer:
Ignoring the effects of air resistance, the speed of gravity on Earth is 9.81 m/s 2.
Explanation:
a) Calculate force FL upwards (the hand on the right)
b) Calculate Fr downwards
Answer:
did you find the answer yet??
Explanation:
In which of the following ways is region B in the diagram different from region D? (1 point)
A
Region B, the corpus callosum, separates the brain into two halves while region D, the cerebellum, communicates between the two halves.
B
Region B, the cerebrum, is one single unit composed of gray matter, while region D, the cerebellum, is divided into two hemispheres.
C
Region B, the corpus callosum, is composed of several lobes while region D, the cerebellum, only has one lobe.
D
Region B, the cerebrum, is divided into two hemispheres while region D, the cerebellum, is one single structure.
Answer:
C
Explanation:
Answer:
C
Region B, the corpus callosum, is composed of several lobes while region D, the cerebellum, only has one lobe.
Explanation:
What are three examples of objects that float in water?
(Please don't copy and paste)
Answer:
anything inflated, a can, and a pencil.
Explanation:
these objects can flaot on water because theyre mass is not enough for the objects to sink.
How will you express the following in m: a. 10 nm b. 110 pm c. 120 mm d. 200 km
Please help me
Answer:
1 km = 1000 m
1 m = 100 cm
1 m = 1000 mm
1 cm = 10 mm
hope this helps u figure it out :)
how height does a 2.5 Kg object rises when 255J of work done against gravity A 637.5 B 20.5 C 15m D 10.2 m
Answer:
D 10.2
Explanation:
255 ÷ 2.5= 10.2 or D
Answer:
D
Explanation:
Work = Mass * Gravity(9.8) * Height
height=work/(mass*9.8)
height=255/(2.5*9.8)=10.4m
PLEASE HELP!! ILL MARK BRAINLYEST!!!
A change in temperature causes a change in mass.
True
False
Answer:
False
Explanation:
A pyrotechnical expert needs to fire a 15 kg projectile from a launching device that has a barrel length of 2 meters. The projectile will need to be launched horizontally 1 km in 5 seconds. Calculate the force needed to launch the projectile.
Answer:
The force needed to launch the projectile is 150000 N.
Explanation:
We can find the force using the following equation:
[tex] F = ma [/tex]
Where:
m: is the mass = 15 kg
a: is the acceleration
First, we need to find the acceleration of the projectile:
[tex] v_{f}^{2} = v_{0}^{2} + 2ax [/tex]
Where:
[tex]v_{f}[/tex]: is the final speed
[tex]v_{0}[/tex]: is the initial speed = 0
x: is the distance = 2 m
The final speed is:
[tex]v_{f} = \frac{1 km}{5 s}*\frac{1000 m}{1 km} = 200 m/s[/tex]
Then, the acceleration is:
[tex]a = \frac{v_{f}^{2}}{2x} = \frac{(200 m/s)^{2}}{2*2 m} = 10000 m/s^{2}[/tex]
Finally, the force is:
[tex]F = ma = 15 kg*10000 m/s^{2} = 150000 N[/tex]
Therefore, the force needed to launch the projectile is 150000 N.
I hope it helps you!
a bus moving at speed of 25m/s beginning to slow at rate 4m/s^2each second how long does it take to stop
Explanation:
Initial velocity is 25m/s i.e. u. Final velocity would be zero since the bus stopped. It is noted that the bus deccelartion of 4m/s, so the acceleration should be considered negative of 4m/s I.e. 4m/s. So using third law of motion i.e.
v^2 - u^2= 2as
(0)^2 - (25)^2= -2×4×s {Note here I used minus sign in acceleration}
-625 = -8×s
s=625 ÷ 8
s= 125 m
So bus would cover a distance of 125m before coming to rest.
Another coin is thrown up into the air and hit the ground after 6s with a velocity of -60 m/s after experiencing an acceleration of -9.8 m/s2. What was its initial velocity?
Answer:
Vf = Vi + a t fundamental equation
-60 m/s= Vi - 9.8 m/s^2 * 6 sec taking upward direction as positive
Vi =58.8 m/s - 60 m/s = -1.2 m/s so the coin was initially thrown downward
As a check take the downward direction as positive
Vf = 1.2 m/s + 58.8 m/s = 60 m/s
An object experiences a uniform circular motion in a horizontal plane, as illustrated below. The direction of the net force is ____. which letter
Answer:
C
Explanation:
Centripital force points to the center.
Using Newton's second law we can know the direction of the force that creates the uniform circular motion, the correct answer is:
C) The force must go towards the center of the circle
Newton's second law establishes a linear relationship between force and mass of the body and its relationship is
F = m a
The bold letters indicate vectors, where F is the force, m the mass that is a scalar and the acceleration of the body
By analyzing this expression we see that the direction of the net force and the acceleration are the same,
The uniform circular motion is characterized by having a speed, speed modulus, constant therefore in the movement the acceleration vector must be perpendicular to the speed so that the change is of direction only.
The acceleration must go towards the center of the circle and by Newton's second law the net force must also go towards the center of the circle.
Let's analyze the different strengths of the graph
a and d) Tangential force to the circle
False. This force changes the modulus of the velocity so the movement stops being uniform circular
e) outward perpendicular force
False. This force changes the direction of the velocity and maintains its modulus, but the antiparallel to the acceleration which contradicts Newton's second law
b) Force at an angle.
False. This force can be decomposed into two vectors, one parallel and the other perpendicular to the circle, the parallel vector combines the speed modulus and the movement is elliptical.
c) Force towards the center of the circle.
True. This force changes the direction of the velocity and maintains its modulus, in addition, the acceleration is in the direction of the change in velocity, which is why the particle describes the circle.
Using Newton's second law we can know the direction of the force that creates the uniform circular motion having the correct answer is:
c) The force must go towards the center of the circle
learn more about the centripetal force here:
https://brainly.com/question/14249440
What variables have the most effect on the strength of the gravitational attraction between two massive objects?
Help
Answer:
The distance between the 2 centers of the object.
Explanation:
If it's harder to win a super bowl for the rams than the gravity means the chiefs will win it.
please help!!!!!!!!!!
Answer:
C. Acceleration due to gravity
Explanation:
which is 9.8 m/s2 on Earth. The formula for calculating weight is F = m × 9.8 m/s2.
Weekend A
Assignment
Differentiate between forced and damped oscillation
Answer:
A damped oscillation means an oscillation that fades away with time while Forced oscillations occur when an oscillating system is driven by a periodic force that is external to the oscillating system.
Explanation:
Damping is the reduction in amplitude (energy loss from the system) due to overcomings of external forces like friction or air resistance and other resistive forces. ... When a body oscillates by being influenced by an external periodic force, it is called forced oscillation.
Hope this helpedWelcome
PLEASE HELP!! ILL MARK BRAINLYEST!!
All matter has mass and takes up space.
True
False
Answer: True
Explanation:
Mass is the amount of matter in an object. Everything is made up of matter.
Answer: true
Explanation: Matter is all the “stuff” that exists in the universe. It has both mass and volume. Mass measures the amount of matter in a substance or an object.
2. A Se lanza un electrón con rapidez inicial v0 = 1.60×106 m/s hacia el interior de un campo uniforme entre las placas paralelas de la figura E21.33. Suponga que el campo entre las placas es uniforme y está dirigido verticalmente hacia abajo, y que el campo fuera de las placas es igual a cero. El electrón ingresa al campo en un punto equidistante de las dos placas. A) Si el electrón apenas elude la placa superior al salir del campo, encuentre la magnitud del campo eléctrico. B) Suponga que en la figura E21.33 el electrón es sustituido por un protón con la misma rapidez inicial v0. ¿Golpearía el protón una de las placas? Si el protón no golpea ninguna de las placas, ¿cuáles serían la magnitud y la dirección de su desplazamiento vertical, cuando sale de la región entre las placas? C) Compare las trayectorias que recorren el electrón y el protón, y explique las diferencias. D) Analice si es razonable ignorar los efectos de la gravedad para cada partícula.
Answer:
A) E = 145.6 N / C , B) y= 2,8 10-7 m with a downward direction
C) he shape of the trajectory of the two particles is to simulate a parabola,
D) F_{e} /F_{g} = 10³⁴
Explanation:
A) For this exercise we use Newton's second law to find the acceleration of the electron, where the force is electric
F = m a
- e E = m a
a = - e E / m
with the field directed downward, the acceleration is in the vertical upward direction.
We look for how much the electron moves with kinematics, in the x direction there is no acceleration,
x axis (parallel to plates)
x = v₀ t
t = x / v₀
y axis (perpendicular to plates)
y = y₀ + [tex]v_{oy}[/tex] t + ½ a t²
Let's take the zero of the system in the middle of the plates y₀ = 0, also the initial vertical velocity is zero (v_{oy} = 0) the width of the plate is known
y = ½ a t²
we substitute
y = ½ (e E /m) (x / v₀)²
y = ½ e x2 /m v₀² E
we look for the electric field
E = 2 m y v₀² / e x²
where to use this expression the length and width of the condenser must be known, suppose that the length is x = l = 1 cm = 1 10⁻² m and the width is y = 0.5 mm = 0.5 10⁻³ m
let's calculate
E = 2 9.1 10⁻³¹ 0.5 10⁻³ (1.6 10⁶)² / (1.6 10⁻¹⁹ (1 10⁻²)²)
E = 145.6 N / C
B) The electron is exchanged for a proton
Let's look for the vertical displacement, in this case as the proton has a positive charge it moves towards the bottom of the plates
y = ½ e x² / m v₀² E
y = ½ 1.6 10⁻¹⁹ 1 10⁻⁴ / (1.67 10⁻²⁷ (1.6 10⁶)² 145.6
y = 28.4375 10⁻⁸ m
since the distance between the plates is 0.5 10-3 m, the proton passes the condensate because its deflection is very small
In summary, its displacement is y= 2,8 10-7 m and with a downward direction (the same direction of the electric field)
C) The shape of the trajectory of the two particles is to simulate a parabola, but one for having a negative charge (electron) the force is upwards and the other for having a positive charge (proton) the trajectory is downwards
D) The force of gravity
[tex]F_{g}[/tex] = G m M / R²
electron
Between the electron and the positive charges of the conducting plate
F_{g}= 6.67 10⁻¹¹ 1.67 10⁻²⁷ 9.1 10⁻³¹ / (0.5 10⁻³)²
F_{g} = 4.1 10⁻⁵¹ N
electric force
F_{e} = -e E
F_{e} = - 1.6 10⁻¹⁹ 145.6
F_{e} = 2.3 10⁻¹⁷ N
let's look for the reason between these two forces
F_{e} / F_{g} = 2.3 10⁻¹⁷ / 4.1 10⁻⁵¹
F_{e} /F_{g} = 10³⁴
We see that the electric force is many orders of magnitude higher than the gravitational force.
The table below compares the solubility of two substances in 100 milliliters (mL) of water.
SOLUBILITY OF SUBSTANCES
Solubility Temperature l Sucrose l Hydrochloric acid
l Grams/100mL water l Grams/100mL water
--------------------------------------------------------------------------------------------------------
Solubility at 20°C l 204 l 720
--------------------------------------------------------------------------------------------------------Solubility at 100°C l 488 l 989
Based on the table, which of the following statements is true?
The solubility of sucrose increases if more is dissolved.
The solubility of sucrose decreases as temperature increases.
The solubility of hydrochloric acid increases if more is dissolved.
The solubility of hydrochloric acid increases as temperature increases.
Answer:
d
Explanation:
I did the test and got it right.
Based on the table, the statement that is true about the solubility of two substances in 100 milliliters is the solubility of hydrochloric acid increases as temperature increases. The correct option is d.
What is solubility?Solubility is a condition when the solute is fully mixed with the solvent and there is no difference between the molecules of solvent and the solutes. The solubility of a substance is based on its molecules. If they are polar, then they can dissolve in numerous solvents.
The salt molecules are fully soluble in the water. The molecules which get dissolved are called the solute and the molecules that dissolve something within them, are called solvents.
Thus, the correct option is d, The solubility of hydrochloric acid increases as temperature increases.
To learn more about solubility, refer to the link:
https://brainly.com/question/8591226
#SPJ6
A book is laying on the floor (in equilibrium). If you were only given the normal force describe how you would go about finding the mass of the book.
Answer
divide by 9.8 or 10
Explanation:
normal force equals to the weight, which is equal to mass* gravitational force
Eli and Andy want to find out which of the two is stronger. Eli pushes a table with a force of 120 newtons while Andy pushes the table from the opposite side with a force of 125 newtons. Ignoring the masses of Eli and Andy, what is the resultant acceleration of the table if its mass is 10.0 kilograms?
A.
13.5 meters/second2
B.
0.50 meters/second2
C.
4.0 meters/second2
D.
5.50 meters/second2
E.
1.35 meters/seconds2
Answer:
B. 0.50 meters/second^2
Explanation:
Given:
mass of table (m) = 10.0 kgEli's force (F1) = 120 NAndy's force (F2) = -125 NArranging Formulas and Substituting Values, Part 1:
F = F1 + F2F = 120 + (-125)F = -5 NThe -5 means that the table will move along the direction of the force applied by Andy.Arranging Formulas and Substituting Values, Part 2:
m * a = Fa = F / Ma = -5 / 10.0 kga = -0.5 m/s^2Answer:
B. 0.50 meters/second^2
Explanation:
Fill in each blank with the correct word.
A male reproductive cell is called a(n) .
A female reproductive cell is called a(n) .
When male and female reproductive cells join during fertilization, a(n) forms.
Answer:
male= sperm cell
female= egg cell
together= embryo
Explanation:
Answer:
1. sperm
2. egg
3. zygote
Explanation I took this test and these are the correct answers because the third one above is not right.
In 2-3 sentences Explain the relationship between speed, frequency, and wavelength
Answer:
The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw = fλ, where vw is the speed of sound, f is its frequency, and λ is its wavelength. ... The frequency is the same as that of the source and is the number of waves that pass a point per unit time.
Explanation:
HOPE THIS HELPS ;}
What is the displacement of the elephant between 0s and 16 s?
m
What is the distance traveled by the elephant between 0s and 16 s?
m
Answer:
Displacement is 9m
Distance traveled is 9m