Answers
Answer:
12.64 m
Explanation:
Recall that the formulas for kinetic & poteintial energy are:
kinetic energy = (1/2) m v²
potential energy = m g h
where m = mass of the baseball,
g = acceleration due to gravity (i.e 9.81 m/s²)
v = initial velocity = 56.7 km/h = 15.75 m/s
h = height (we are asked to find this)
For a baseball to come to a complete stop when thrown straight up and neglecting air resistance. By the conservation of energy, we can say that kinetic energy is entirely transformed into potential energy, i.e
kinetic energy = potential energy
(1/2) m v² = m g h (m cancels out)
(1/2) v² = g h (rearranging)
h = (1/2) v² /g
Given that the initial velocity, v = 56.7 km/h = 15.75 m/s
substituting this into our equation:
h = (1/2) v² /g
h = (1/2) (15.75)² /9.81
h = 12.64 m
Answer:
12.7 m
Explanation:
Given:
v₀ = 56.7 km/h = 15.75 m/s
v = 0 m/s
a = -9.8 m/s²
Find: Δy
v² = v₀² + 2aΔy
(0 m/s)² = (15.75 m/s)² + 2 (-9.8 m/s²) Δy
Δy = 12.7 m
Related Questions
A train is traveling at a speed of 75km/hr. The brakes are applied to produce a uniform acceleration of -0.5 m/s2.Find how far the train goes before it stops?
Answers
Answer:
your answer would be 21m
Explanation:
A body oscillates with 25hz what is its time period
Answers
Answer:
4 seconds
Explanation:
The frequency of a body is the number of oscillations in one second. It is the number of cycles per unit time. The S.I unit of frequency is the Hertz (Hz).
The period of a body is the time taken to complete one oscillation. The period is inversely proportional to the frequency of the body. It is the reciprocal of frequency and the S.I unit is second (s).
A body oscillates with 25hz. Therefore the frequency (f) = 25 Hz.
The period (T) is given as:
[tex]Period (T)=\frac{1}{frequency(f)} \\T=\frac{1}{f} =\frac{1}{0.25}=4\\T=4\ seconds[/tex]
a boy runs from his house to school at speed 5m/s on a straight road and returns with speed of 10m/s.The distance between the house and school is 100m. Find his average velocity.... with explaination please
Answers
Explanation:
time spent to run from house to school=100/5=20s
time spent to return from school=100/10=10s
average velocity=200m/(10+20)
=6.66m/s0.5 kg of blood flows from the interior to the surface of John's body while he is exercising. The released energy is 2,000 J. The specific heat capacity of blood is 4,186 J/kgo C. What is the temperature difference between when the blood arrives at the body surface and returns back to the Interior of the body?
Answers
Answer:
0.96°CExplanation:
Specific heat capacity of a body is expressed as H = mcΔt
H = heat energy released by the body
m = mass of the body
c = specific heat capacity of the body
Δt = change in temperature of the body
Given H = 2000J, m = 0.5 kg, c = 4,186 J/kg° C.
Δt = H/mc
On substituting the given value;
Δt = 2000/4,186*0.5
Δt = 2000/2093
Δt = 0.96°C
The temperature difference between when the blood arrives at the body surface and returns back to the Interior of the body is 0.96°C
The lifting force, F, exerted on an airplane wing varies jointly as the area, A, of the wing's surface and the square of the plane's velocity, v. The lift of a wing with an area of 190190 square feet is 95009500 pounds when the plane is going 220220 miles per hour. Find the lifting force on the wing if the plane slows down to 190190 miles per hour. (Leave the variation constant in fraction form or round to at least 5 decimal places.
Answers
Answer:
F'=708.53 N
Explanation:
We have,
The lifting force, F, exerted on an airplane wing varies jointly as the area, A, of the wing's surface and the square of the plane's velocity, v. It means tat,
[tex]F=kAv^2[/tex]
k is constant
If, A = 190 Ft², v = 220 mph, F = 950 pounds
Let's find k first from above data. So,
[tex]k=\dfrac{F}{Av^2}\\\\k=\dfrac{950}{190\times 220^2}\\\\k=0.0001033[/tex]
It is required to find the lifting force on the wing if the plane slows down to 190 miles per hour. Let F' is the new force. So,
[tex]F'=0.0001033\times 190\times (190)^2\\\\F'=708.53\ \text{pounds}[/tex]
So, the lifting force is 708.53 pounds if the plane slows down to 190 miles per hour.
The lifting force on the wing if the plane slows down to 190 miles per hour F'=708.53 N
What is force?The force is an external agent applied to the body to displace it from its position .The force can be of different types lifting force, Frictional force, viscous force etc.
We have,
The lifting force, F, exerted on an airplane wing varies jointly as the area, A, of the wing's surface and the square of the plane's velocity, v. It means that,
[tex]F=kAv^2[/tex]
k is constant
If, A = 190 Ft², v = 220 mph, F = 950 pounds
Let's find k first from above data. So,
[tex]k=\dfrac{F}{Av^2}[/tex]
k=950/190*220^2
k=0.0001033
It is required to find the lifting force on the wing if the plane slows down to 190 miles per hour. Let F' is the new force. So,
F'=0.0001033×190×190^2
F'=708.53 pounds
So, the lifting force is 708.53 pounds if the plane slows down to 190 miles per hour.
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1. Name something that is not matter. Why is it not matter? (3 points)
Answers
Answer:
Light is nor a matter because
It has no mass
It occupies no volume
We can't touch it.
Explanation:
Matter is any material that has mass and occupies volume.
Here are 25 things that don't:
Truth, Peace, Justice, Honesty, Beauty, Envy, Jealousy, Gluttony, Pride, Arrogance, Modesty, Humility, Bravery, Victory, Democracy, Sincerity, Secrecy, Pain, Pleasure, Mercy, Liberty, Equality, Fraternity, Freedom, and Virtue have no mass, and they don't occupy any space. So none of them contains any matter.
HURRY!!!!
Fred and Ted are racing cars down a frictionless track with a jump at the bottom
when suddenly an argument breaks out. Fred says, “If we release the cars from a
point twice as high as we are currently doing so, the cars will have twice the
gravitational potential energy, and therefore be travelling twice fast when they hit
the jump." Ted says, “In order to double the speed of the cars when they hit the
ramp, I think we will have to more than double the height!" Who is right? Prove it!
Answers
Answer:
Ted is correct
Explanation:
The equation for gravitational potential energy is PE = m·g·h
The equation for gravitational kinetic energy is KE = 1/2·m·v²
Where:
m = Mass of the object (The racing car)
g = Acceleration due to gravity
h = The height to which the object is raised
v = Velocity of motion of the object
From the principle of conservation of energy, energy can neither be created nor destroyed but changes from one form to another, we have;
Potential energy gained from location at height h = Kinetic energy gained as the object moves down the level ground
m·g·h = 1/2·m·v² canceling like terms gives
g·h = 1/2·v²
v = (√2·g·h)
If the speed is doubled, we have
2·v = 2× (√2·g·h) = (√2·g·4·h)
Therefore, if 2·v = v₂ then v₂ = (√2·g·4·h)
Since g, the acceleration due to gravity, is constant, it means that the initial height must be multiplied or increased 4 times to get the new height, that is we have;
v₂ = (√2·g·4·h) = (√2·g·h₂)
Where:
4·h = h₂
Which gives;
v₂² = 2·g·h₂
1/2·v₂² = g·h₂
1/2·m·v₂² = m·g·h₂ Just like in the first relation
Therefore, Ted is correct s they need to go up four times the initial height to double the speed.
A lightbulb is rated by the power that it dissipates when connected to a given voltage. For a lightbulb connected to 120 V household electricity, decreasing the resistance of the filament will _____ the current through the bulb and _____ the power dissipated by the bulb. A lightbulb is rated by the power that it dissipates when connected to a given voltage. For a lightbulb connected to 120 V household electricity, decreasing the resistance of the filament will _____ the current through the bulb and _____ the power dissipated by the bulb. Decrease, decrease Decrease, increase Increase, increase Increase, decrease
Answers
Answer:
Increases, increases
Explanation:
The current is directly proportional to the voltage and inversely proportional to the resistance. The implication of this is that, whenever the voltage is increased, the current increases simultaneously. On the other hand, if the resistance is increased, the current will decrease accordingly and vice versa.
Recall that power is given by P= V^2/R where;
P= power, V= voltage and R= resistance
We can see that power and resistance are inversely related hence decreasing the resistance increases the power output of the lightbulb.
Answer:
Increase, increase
Explanation:
Ohm's law states that R=V/I .
This can be rearranged as I = V/R , showing that current is inversely proportional to resistance. When resistance decreases, current increases (with constant voltage).
Power dissipated by a resistor is given by the equation P = RI^2 . Showing that as R decreases and increases I, the increase to I is exponential while the decrease in resistance is not, which leads to increased power dissipation.
1.what are some of the impacts of modern communication in our socio economic life?
2.how is possible to make a call to our relatives residing in other part of country ?explain?
Answers
Answer:
The impacts of modern communication in our socio economic life includes;
a) Staying connected
b) Carrying out business transaction
c) Exceeding boundaries
d) Overcoming weakness and disability
e) Reaching out to a wider audience
2. It is possible to make long distant call to our relatives in other part of the country by direct distance dialing (DDD)
Explanation:
The telecommunication service called direct distance dialing allows a caller to make a call to a location outside the area where they are calling without the assistance of an operator. To make a direct dialing call, a subscriber or caller will be required to include extra prefix digits to the original number than for numbers within hers or his particular local area code.
difference between physics and science
Answers
Difference is that science is a particular discipline or branch of learning, especially one dealing with measurable or systematic principles rather than intuition or natural ability or science can be scion while physics is the branch of science concerned with the study of properties and interactions of space, time etc
Every object that has mass attracts every other object with a gravitational force: It has been proven that the size of the
gravitational force increases as the objects' masses increase, but gravitational force decreases rapidly as the distance
between the objects increases.
Which best describes this statement about matter and its behavior?
hypothesis
theory
law
explanation
Answers
Answer:
this is a law because it is a constant fact of nature
Explanation:
- This statement about matter and its behavior is best classified as a Law.
-It is the Law of Universal Gravitation.
Explanation;
-The Law of Universal Gravitation states that every point mass attracts every other point mass in the universe by a force pointing in a straight line between the centers-of-mass of both points, and this force is proportional to the masses of the objects and inversely proportional to their separation.This attractive force always points inward, from one point to the other.
-The Law applies to all objects with masses, big or small. Two big objects can be considered as point-like masses, if the distance between them is very large compared to their sizes or if they are spherically symmetric.
Identify the base quantities un the following
Speed
Area
Force
Distance
Plz help it's urgent
Answers
Answer:
Distance
Explanation:
Distance is the base quantity (measured in lengths) while speed, Area and Force are all derived quantities derived from base quantities.
A window washer is standing on a scaffold supported by a vertical rope at each end. The scaffold weighs 210 N and is 2.8 m long. What is the tension in each rope when the 698-N worker stands 1.80 m from one end?
Answers
Answer:
The value of tension in the two ropes are 354.2 N and 553.8 N
Explanation:
Find the free body diagram attached below.
For the system to be in mechanical equilibrium, the following conditions have to be satisfied.
1. Upward forces must be equals to the downward forces,
T1 + T2 =210N + 698N
[tex]T1 + T2 =908 ------------------ equation 1[/tex]
2. Clock-wise turning moments = anti-clockwise turning moments
[tex]T1 \times 2.8 = 210N \times 1.4m + 698N\times (2.8 - 1.8)\\2.8T1 =294Nm + 698Nm\\2.8T1 =992Nm\\T1 = \frac{992}{2.8}=354.2 N[/tex]
From this, we were able to evaluate the value of T1 by taking our moments about T2 as the turning point
We can input the value of T1 into equation 1 to give us the value of T2 as
T2 = 908 - T1
T2 = 908 - 354.2N= 553.8 N
There fore, the value of tension in the two ropes are 354.2 N and 553.8 N
A bus accelerates at -0.5 m/s2 for 12.5 seconds . If the bus had an initial speed of 31 m/s, what is its new speed? A. 12.25m/s B. 37.25m/s C. 24.75m/s D. 6.25m/s
Answers
Answer:
37.5m/s
Explanation:
a=(v-u)/t
0.5 = (v - 31) / 12.5
v - 31 = 0.5 x 12.5
v - 31 = 6.25
V = 6.25 + 31
v = 37.25m/s
Neon gas in a container was heated from 20 degrees celsius to 120 degrees celsius.Its new volume is 150ml.what was the original volume?
Answers
Answer:
110 mL
Explanation:
Ideal gas law:
PV = nRT
Assuming the container isn't rigid, and the pressure is constant, then:
V/T = V/T
Plug in values (remember to use absolute temperature).
V / 293 K = 150 mL / 393 K
V = 110 ml
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1. How much heat energy is required to raise the temperature of a 5 kg aluminium bar
from 28°C to 68°C ?
( Specific heat capacity of aluminium = 900 J kg C)
Answers
Answer:
180 kJ
Explanation:
Given that:
Mass (m) = 5 kg
Initial temperature (T1) = 28°C
Final temperature (T2) = 68°C
The change in temperature (ΔT) = T2 - T1 = 68°C - 28°C = 40°C
Specific heat capacity of aluminium (c) = 900 J/kg°C
The quantity of heat energy required (q) is given by:
q = mcΔT
q = 5 kg × 900 J/kg°C × 40°C
q = 180000 Joules
q = 180 kJ
Therefore 180 kJ is required to raise the temperature of aluminium from 28°C to 68°C.
water is a nonpolar molecule true or false
Answers
Answer:
Water is non-polar molecule False
Water is polar molecule because the electronegativity of Oxygen is much greater than electronegativity of hydrogen and it has also a bend shape that is why it is polar molecule.
Explanation:
I hope this will help you :)
False. Water is a polar molecule.
About waterWater (H2O) consists of two hydrogen atoms and one oxygen atom. The oxygen atom has a higher electronegativity, meaning it attracts electrons more strongly than hydrogen.
As a result, the shared electrons in the covalent bonds between hydrogen and oxygen are pulled closer to the oxygen atom, creating an uneven distribution of charge.
This leads to a partial negative charge (δ-) on the oxygen atom and partial positive charges (δ+) on the hydrogen atoms, making water a polar molecule.
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why does damp soil help excess electrons move
Answers
Explanation:
Because where there is water, energy is conducted, and moves the electrons.They also move excess electrons because pure water is a poor conductorName the three different types of radiation and describe how they are different in their penetrating abilities. Explain.
Answers
Answer:
The three different type of radiations are:
1) Alpha (α) radiation
2) Beta (β) radiation
3) Gamma ([tex]\gamma[/tex]) radiation
Penetrating Ability:
Penetrating Ability of gamma rays is the highest.
That of Beta Rays is higher.
That of Alpha Rays is lowest
The three types of radiation are alpha particles, beta particles, and gamma rays. From least to most penetrating, alpha < beta < gamma.
What are the ranges and ionising power of these radiations?Alpha ; 3-5 cm, highly ionising.Beta ; up to 15 cm, ionising.Gamma ; more than 15 cm, weakly ionising.What is ionising radiation?Ionizing radiation - form of energy that usually acts by removing electrons from their atoms and molecules of materials that include air, water, and living tissue.
So, these are the types of radiations.
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answer the following question
Answers
Answer:
A) OA, AB, BC
B) 25m/s^2
C) see explanation
D) 25
E) Rest
Explanation:
From the Velocity time graph shown:
The positive slope = OA ; This is positive because, it is the point of uniform acceleration on the graph.
Constant slope = AB, the slope here is constant because, AB on the graph is the point of constant velocity.
-ve slope = BC
B) Acceleration of body in path OA.
Acceleration = change in Velocity / time
Acceleration = (150 - 0) / 6
Acceleration = 150/6 = 25m/s^2
C) Path AB is Parallel to the because it marks the period of constant velocity (that is Velocity does not increase or decrease during the time interval).
D) Length of BC
BC corresponds to the distance moved, that velocity / time
Velocity = 150 ; time = 6
Therefore Distance (BC) = 150/6 = 25
E.) Velocity =0 ; Hence body is at rest
a jet can travel at 350 m/s.
calculate how far it will travel in :
a) 30 secs
b) 5mins
c) half an hour
Answers
Explanation:
distance = speed x time
a- d= 350 m/s x 30s
d= 10500m
b- 5 mins = 300 sec
d= 350 m/s x 300s
d= 105000 m
c- 30 mins = 1800 sec
d= 350 m/s x 1800 s
d= 630000 m
Dos personas conversan a través de una gruesa pared de 3 metros de altura interpuesta entre ellos. Este hecho puede ser mejor explicado por el fenómeno de la A) difracción. B) refracción. C) reflexión. D) polarización. E) ninguna de las anteriores
Answers
Answer:
Opción A - Difracción
Explanation:
Mirando las opciones, la respuesta correcta es la difracción.
Esto se debe a que la difracción es simplemente la propagación de las olas alrededor de los obstáculos.
Por ejemplo, si estuviera afuera de una puerta abierta, aún podría escuchar porque la arena se extenderá desde la pequeña abertura como si fuera una fuente localizada de arena.
Esto es posible debido al fenómeno llamado difracción.
Can someone please help me out with this question? It's due pretty soon and I dont really understand it
One idea of how the universe formed is based on a huge explosion that sent matter and energy speeding throughout space. Stars, planets, and other space objects formed when the matter clumped together slowly.
What is the name of the idea that matches this description of how the universe formed?
Select one:
a. Convection Particle theory
b. Clumping Matter theory
c. Swirling Cloud theory
d. Big Bang theory
Answers
Answer: The Big Bang Theory
Explanation:
Indicar tipo de unión química que presentan los siguientes compuestos. Realizar a representación de Lewis, molecular o iónica, según corresponda: a-CH4 b-SrO c-HBr d-NH3 e-Cl2O f-Li2O g-CO2 h-MgCl2
Answers
Answer:
Explanation:
a. CH₄- Covalent bonding(ligação covalente)
b. SrO- ionic bonding (ligação iônica)
c. HBr- Polar Covalent bonding (ligação covalente polar)
d. NH₃ - covalent bonding(ligação covalente)
e. Cl₂O - Covalent bonding (ligação covalente)
f. Li₂O- ionic bonding (ligação iônica)
g. CO₂ - double covalent bonding (ligação covalente dupla)
h. MgCl₂- ionic bonding(ligação iônica)
Hurry Please !!!!!
Study the diagram
Point C identifies the____
of the wave
Answers
Answer: Trough
Explanation: The point labeled C in the wave diagram above is the TROUGH of the wave motion. The trough of a wave motion identifies or signifies the point of least or minimum Displacement by measuring the downward Displacement of the wave. The point A is the CREST which is the opposite of the trough, signifying the point of maximum or upward Displacement of the wave cycle.
Point B is the wave amplitude which signifies the maximum extent of vibration from the equilibrium position of a wave. The point labeled D refers to the wavength of the wave motion which is the distance between successive crest or troughs of a wave motion.
A car of mass 800 kg is moving at a uniform velocity of 72 km/hr. Find its
momentum.
(Ans: 16000 kgm/s)
Answers
Answer:
P = 16,000 kgm/s
Explanation:
Given :
Mass = m = 800 kg
Velocity = v = 72 km/hr = 20 m/s
Required :
Momentum = P = ?
Formula:
P = mv
Solution:
P = (800)(20)
P = 16,000 kgm/s
Answer:
Explanation:
Momentum = Mass × Velocity
Mass = 800 kg
Velocity = 72 km/hr = 20 m/s
∴ Momentum = 800 × 20
= 16000 kgm/s
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A rifle is used during the biathlon event in the Olympics. The rifle has a mass
of 3 kg and the bullet has a mass of 0.015 kg. After it is shot, the bullet travels
at a speed of 450 m/s. What is the total momentum of the rifle bullet system
after the bullet is shot?
A. 1350 kg-m/s
OB. 0 kg-m/s
O C. 6.75 kg-m/s
D. 1365 kg-m/s
Answers
Answer:
0 kg m/s
Explanation:
before the bullet is shot the velocity of the gun & the bullet is 0.
Answer:
0 kg-m/s
just did it ;D
Explanation:
Compare the atmospheric pressure of two places 500m and 2 km respectively above sea-level. Give reason for your answer.
Answers
Answer:
Explanation:
The average pressure at mean sea-level (MSL) in the International Standard Atmosphere (ISA) is 1013.25 hPa, or 1 atmosphere (atm), or 29.92 inches of mercury. Pressure (p), mass (m), and the acceleration due to gravity (g), are related by P = F/A = (m*g)/A, where A is surface area.
A 0.3-m-radius automobile tire rotates how many revolutions after starting from rest and accelerating at a constant 2.13 rad/s2 over a 23.2-s interval?
Answers
Answer:
The automobile tire rotates 91 revolutions
Explanation:
Given;
angular acceleration of the automobile, α = 2.13 rad/s²
time interval, t = 23.2-s
To calculate the number of revolutions, we apply the first kinematic equation;
[tex]\theta = \omega_i \ + \frac{1}{2} \alpha t^2[/tex]
the initial angular velocity is zero,
[tex]\theta =0\ + \frac{1}{2} (2.13) (23.2)^2\\\\\theta = 573.2256 \ Rad[/tex]
Find how many revolutions that are in 573.2256 Rad
[tex]N = \frac{\theta}{2 \pi} = \frac{573.2256}{2\pi} \\\\N = 91 \ revolutions[/tex]
Therefore, the automobile tire rotates 91 revolutions
A trapezoid shaped dam is 100 meters wide at the top, 80 meters wide at the bottom, and 40 meters deep. To find the total force exerted on the dam by the water, how would you set up the integral?
Answers
Answer:
F = 9800(42667 + 16000)
F = 5.75 × 10⁸N
Explanation:
