Answer:
a = 12 m / s²
Explanation:
Let's apply Newton's second law
F = m a
where F is the force, m the mass of the body and the acceleration
we clear
a = F / m
let's calculate
a = 180/15
a = 12 m / s²
this acceleration has the same direction of the force
a basketball has a positive or negative a acceleration when thrown
Answer:
A negative acceleration
Explanation:
When thrown, the basketball leaves the hands of the thrower with an initial velocity. This initial velocity is then gradually decelerated (negative acceleration) by drag forces, and its gravitational attraction to the earth, until the ball comes to rest. The acceleration on a thrown basketball is therefore negative.
Buildings are more dense than the surrounding air. This means that they have more _____ per volume than the air and will stay on the ground instead of floating up into the atmosphere.
Answer:
mass
Explanation:
Density is the measure of how much mass of a substance is squeezed into a given volume of that substance. It is the mass per unit volume, and substances with lesser density will float in materials with denser density. Buildings are generally more obviously denser that air, if not we'll see then float upwards into the atmosphere, but that is not the case. Different liquids too can separate and form layers on one another due to their differences in volume.
name the three scale of temperature
Answer:
Three scales of temperature are
Celcius scale
Fahrenheit scale
Kelvin scale
Explanation:
Hope it will help :)
Answer:
Celsius (is the most used)FahrenheitKelvinAs a 1850 kg car is traveling down a road, it experiences a force of friction of 121 N and a force of air resistance if 186N. If the engine is not applying any force, what is the acceleration of the car
Answer:
-0.166 m/s²
Explanation:
F = Ma
a = F/M = (121 N +186 N)/(1850 kg) = 0.166 m/s²
The acceleration of 0.166 m/s² is in the direction opposite to the direction of travel, so might be considered to be negative.
Answer:
-0.166 m/s²
As a 1850 kg car is traveling down a road, it experiences a force of friction of 121 N and a force of air resistance if 186N. If the engine is not applying any force, what is the acceleration of the car
charlie drove his car around the block at a constant velocity, true or false, why or why not
Answer:
The given statement is false.
Explanation:
When you change position or direction as well as move rapidly, the velocity changes. So, if you're traveling or moving around over a block, you're shifting a lot of speed but instead, you likely won't it will be at a continuous rate or pace.Along with its quickest-changing direction, it might travel at reasonable acceleration but never of constant velocity.
5. a) A boy used a catapult to pluck a mango from a tree. State two forces involved in this activity?
Explanation:
Tensional force and gravitational force
A voltage source is connected across two 1 kohm resistors in parallel. The current flowing through the voltage source is measure by a current meter as 2 mA. What is the voltage across each resistor
Answer:
1 Volt
Explanation:
The resistors have resistance R = 1 kΩ each = 1 x 10^3 Ω each
The current through the voltage source I= 2 mA = 2 x 10^-3 A
The resistors are in parallel, son the total resistance will be
[tex]\frac{1}{R_{T}}[/tex] = [tex]\frac{1}{R_{1}} + \frac{1}{R_{2}}[/tex]
[tex]\frac{1}{R_{T}}[/tex] = 1/1 kΩ + 1/1 kΩ
[tex]\frac{1}{R_{T}}[/tex] = 2/1 kΩ
[tex]R_{T}[/tex] = 1 kΩ ÷ 2 = 0.5 kΩ = 500 Ω
From V = IR
where V is the voltage
I is the current
R is the resistance
substituting, we have
V = 500 x 2 x 10^-3 = 1 V This is the voltage across each resistor
Imagina que compras una placa rectangular de metal de 2mm de alto, 10mm de ancho x 50mm de largo, y una masa de 0.02kg. El vendedor te dice que es de oro, pero para ver si de verdad es de oro, lo verificas calculando la densidad de la placa. ¿Cuál es el valor de la densidad de la placa? ¿Es de oro la placa rectangular?
Answer:
Densidad de la placa = 20 g/cm³.
La placa no es de oro.
Explanation:
Para encontrar la densidad de la placa rectangular primero debemos hallar su volumen:
[tex] V = 2 mm*10 mm*50 mm = 1000 mm^{3}*\frac{1 cm^{3}}{(10 mm)^{3}} = 1 cm^{3} [/tex]
Ahora, encontremos al densidad de la placa:
[tex] d = \frac{m}{V} = \frac{20 g}{1 cm^{3}} = 20 g/cm^{3} [/tex]
Dado que la densidad del oro es 19.32 g/cm³ y que la densidad de la placa rectangular calculada es 20 g/cm³, podemos decir que dicha placa no es de oro.
Espero que te sea de utilidad!
Two students make a model of a tree house they want to
The scale is 1:44. In the scale model, the tree house
has 2 windows.
How many windows should the real tree house have?
O A. 2
O B. 22
C. 4
D. 88
Answer:
A 2
Explanation:
Scaling deals with measurements.
for example, the question says, 1 : 44. Assuming we're using cm : m, this is inferring that, 1 centimeter on the model will represent 44 meters in real life. This means, the number of windows in the real tree will be carried down to the model, only the sizes would be reduced.
if a window in the real tree measures 44 meters, then it would be scaled down to be 1 centimeter on the model.
irrespective, models doesn't change the number of features, only the dimensions.
what is the most used muscle on humans ?
Answer:
the heart
Explanation:
Daily the heart pumps at least 2,500 gallons (9,450 liters) of blood. The heart has the ability to beat over 3 billion times in a person's life.
What is the purpose of a kink in a thermometer?
Answer:
A 'kink' in the glass tube which breaks the mercury as it contracts, storing the highest temperature reading. The glass tube is shaped like a lens to magnify the thin mercury thread. Shaking the thermometer resets the mercury back into the bulb.
Kink in the Mercury thermometer helps to prevents the falling of mercury present in capillary tube into bulb. It ensures that the user takes the correct reading of temperature. That's the reason a person before taking a new reading must give a sudden shake to the clinical thermometer so that the mercury level comes to normal .
"the toy car is about 3 inches long"is an example of a ________ observation
It's a quantitative observation because it includes numerical data.
An electric iron of resistance 20Ω takes a current of 5A. Calculate the heat developed in 30seconds?
The amount of heat (H) produced is given by the joule’s law of heating as H= Vlt
Where,
Current, I = 5 A
Time, t = 30 s
Voltage, V = Current x Resistance = 5 x 20 = 100V
H= 100 x 5 x 30 = 1.5 x 10⁴ J.
Therefore, the amount of heat developed in the electric iron is 1.5 x 10⁴J.
Please mark me as a BRAINLIST
1. Which statement about friction is true?(1 point) A. Static friction and kinetic friction in a system always act in the same direction as each other and in the opposite direction of the applied force. B. Static friction and kinetic friction in a system always act in the same direction as each other and in the same direction as the applied force. C. Static friction and kinetic friction in a system always act in opposite directions of each other and in the same direction as the applied force. D. Static friction and kinetic friction in a system always act in opposite directions of each other and in the opposite direction of the applied force. 2. A brick is resting on a smooth wooden board that is at a 30° angle. What is one way to overcome the static friction that is holding the brick in place?(1 point) A. roughen up the texture of the wooden board B. press down on the brick in a direction that is perpendicular to the board C. lower the board so it's level with the ground D. raise the board to a higher angle
Answer:
true 1Ay 2D
Explanation:
1) In this exercise you are asked to investigate which statements are true
A) True. The friction force opposes the movement caused by the external force,
B) False. Mantuano in the opposite direction force
C) False. The static and scientific friction force act in the same direction, since the second appears when the movement does not start and the static friction decreases.
D) Fale the static and kinetic friction forces act in the same direction
2) How to overcome friction on a ramp
A) False. If the texture of the surface becomes rough, the friction force increases
B) False. Pressing the brick against the surface increases the normal and as the friction is proportional to the normal, it also increases
C) False. By lowering the table the weight component in the friction direction decreases
D) True. When lifting the board, the weight component increases and therefore can become greater than the friction
Wx-fr = ma
W sin tea - my mg cos tea = m a
As it increases, the sine increases and the cosine decreases.
The _______ is responsible for absorbing the most UV radiation.
a.
troposphere
b.
stratosphere
c.
mesosphere
d.
thermosphere
Please select the best answer from the choices provided
A
B
C
D
Answer:
The stratosphere is responsible for absorbing the most UV radiation.
Explanation:
Hope it will help you:)
The Stratosphere is responsible for absorbing the most UV radiation.
What is Stratosphere?The stratosphere is the second layer of the atmosphere as you go upward lying between the troposphere and the mesosphere.The external temperature of these planes decreases and then increases as they leave the stratosphere and return to the ground.This increase in temperature is a result of the ozone layer that is present in the stratosphere and absorbs the UV rays from the Sun, making an elevation in temperature. The stratosphere layer also called the ozonic atmospheric envelope, is important to human's life as it contains the ozone layer which absorbs the harmful ultraviolet radiations which emitted from the Sun and also it is convenient for flying of the planes .
Thus, the Stratosphere is responsible for absorbing the most UV radiation.
Hence, Option B is the correct answer.
Learn more about Stratosphere,
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HELP PLEASE !!!!!!! If a ball is accelerating down through the air with no horizontal motion, what must be true about the net forces acting on the ball? The gravitational force is greater than the drag. The net force on the ball is zero. The drag is greater than the gravitational force. The net force on the ball is directed upward.
physics
Answer:
A. The gravitational force is greater than the drag.
Explanation:
Remember that the second Newton's law says that:
F = m*A
Force equals mass times acceleration.
With this we will see that the correct option is:
"The gravitational force is greater than the drag."
We know that the ball is accelerating downwards, and there is no horizontal motion. Because the acceleration is downwards, we know that the net force must be downwards (for the second law).
Now, what must be true about the net forces acting on the ball? let's analyze each statement:
1) "The gravitational force is greater than the drag."
The gravitational force is what causes the objects to fall down to the ground, so if the ball is falling, this will always be true.
2) " The net force on the ball is zero."
We know that the ball is accelerating, thus the net force can not be zero, this is false.
3) "The drag is greater than the gravitational force. "
This is the opposite to the first option, this is false.
4) "The net force on the ball is directed upward."
The acceleration and the net force have the same direction, if the ball is accelerating downwards, then the net force is directed downwards. This is false.
Then the only true statement is the first one:
"The gravitational force is greater than the drag."
If you want to learn more, you can read:
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A block of wood measures 12cm x 5cm x 10cm. Calculate the volume in (i) cm3 (ii) m3
Given:-
A block of wood measures 12cm x 5cm x 10cm.
To be calculated:-
Calculate the volume in (i) cm3 (ii) m3
Solution:-
Case 1 :
Volume of wood = 12cm x 5cm x 10cm
= 600 cm³
Case 2 :
12 cm = 12/100 = 0.12 m
5 cm = 5/100 = 0.05 m
10 cm = 10/100 = 0.01 m
Volume of wood = 0.12 × 0.05 × 0.01
= 0.00006 m³
Does adding fertilizer affect the growth of a plant
Answer:
yes it does affect the growth of plants
Which sport requires participants to wear safety equipment during competition?
Answer:
Football
Explanation:
Answer:
Hockey
Explanation:
The answer is hockey because in order to play hockey you have to have a lot of safety equipment because people play hockey by being very close to one another. Also, getting hurt during playing hockey without proper equipment can cause many damages to your body.
Hope this helps! :D
If a · b = 20, a = 4, and the angle between the vectors a and b is 30°, what is the magnitude of vector b? Incorrect: Your answer is incorrect.
Answer:
The magnitude of [tex]\vec b[/tex] is approximately 5.774.
Explanation:
According to the definition of dot product:
[tex]\vec a\bullet \vec b = \|\vec a \|\cdot \|\vec b\|\cdot \cos \theta[/tex]
Where:
[tex]\|\vec a\|[/tex], [tex]\|\vec b\|[/tex] - Norms (or magnitudes) of [tex]\vec a[/tex] and [tex]\vec b[/tex], dimensionless.
[tex]\theta[/tex] - Internal angle between [tex]\vec a[/tex] and [tex]\vec b[/tex], measured in sexagesimal degrees.
The magnitude of [tex]\vec b[/tex] is therefore cleared:
[tex]\|\vec b\| = \frac{\vec a \bullet \vec b}{\|\vec a\|\cdot \cos \theta}[/tex]
Given that [tex]\vec a \bullet \vec b = 20[/tex], [tex]\|\vec a\| = 4[/tex] and [tex]\theta = 30^{\circ}[/tex], the magnitude of [tex]\vec b[/tex] is:
[tex]\|\vec b\| = \frac{20}{4\cdot \cos 30^{\circ}}[/tex]
[tex]\|\vec b\| \approx 5.774[/tex]
The magnitude of [tex]\vec b[/tex] is approximately 5.774.
A 0.40 kg mass hangs on a spring with a spring constant of 12 N/m. The system oscillated with a constant amplitude of 12 cm. What is the maximum acceleration of the system
Answer:
The maximum acceleration of the system is 359.970 centimeters per square second.
Explanation:
The motion of the mass-spring system is represented by the following formula:
[tex]x(t) = A\cdot \cos (\omega \cdot t + \phi)[/tex]
Where:
[tex]x(t)[/tex] - Position of the mass with respect to the equilibrium position, measured in centimeters.
[tex]A[/tex] - Amplitude of the mass-spring system, measured in centimeters.
[tex]\omega[/tex] - Angular frequency, measured in radians per second.
[tex]t[/tex] - Time, measured in seconds.
[tex]\phi[/tex] - Phase, measured in radians.
The acceleration experimented by the mass is obtained by deriving the position equation twice:
[tex]a (t) = -\omega^{2}\cdot A \cdot \cos (\omega\cdot t + \phi)[/tex]
Where the maximum acceleration of the system is represented by [tex]\omega^{2}\cdot A[/tex].
The natural frequency of the mass-spring system is:
[tex]\omega = \sqrt{\frac{k}{m} }[/tex]
Where:
[tex]k[/tex] - Spring constant, measured in newtons per meter.
[tex]m[/tex] - Mass, measured in kilograms.
If [tex]k = 12\,\frac{N}{m}[/tex] and [tex]m = 0.40\,kg[/tex], the natural frequency is:
[tex]\omega = \sqrt{\frac{12\,\frac{N}{m} }{0.40\,kg} }[/tex]
[tex]\omega \approx 5.477\,\frac{rad}{s}[/tex]
Lastly, the maximum acceleration of the system is:
[tex]a_{max} = \left(5.477\,\frac{rad}{s})^{2}\cdot (12\,cm)[/tex]
[tex]a_{max} = 359.970\,\frac{cm}{s^{2}}[/tex]
The maximum acceleration of the system is 359.970 centimeters per square second.
A car is traveling at 50 m/s and slows down to 10 m/s in 5 seconds. What is
the car's acceleration? (Remember what is needed when an object slows
down) *
Answer:
-8m/s2
Explanation:
it decelerate. initial velocity u=50m/s and final velocity v= 10m/s and the time t= 5s
using this equation v= u+at
a= v-u/t= 10-50/5=-40/5= -8m/s2
Answer:
[tex] \boxed{\sf Acceleration \ (a) = -8 \ m/s^2} [/tex]
Given:
Initial velocity (u) = 50 m/s
Final velocity (v) = 10 m/s
Time taken (t) = 5 seconds
To Find:
Acceleration (a) of the car
Explanation:
From equation of motion we have:
[tex] \boxed{ \bold{v = u + at}}[/tex]
By substituting value of v, u & t in the equation we get:
[tex] \sf \implies 10 = 50 + 5a \\ \\ \sf \implies 5a + 50 = 10 \\ \\ \sf \implies 5a = 10 - 50 \\ \\ \sf \implies 5a = - 40 \\ \\ \sf \implies a = - \frac{40}{5} \\ \\ \sf \implies a = - 8 \: m {s}^{ - 2} [/tex]
[tex] \therefore[/tex]
Acceleration (a) of the car = -8 m/s²
What is the slope of the line passing through the points (7,4) and (2, 10)?
Answer:
the equation of a straight line is y = m x + b where m is the slope and
b is the y intercept at x = 0
so y1 = x1 + b and y2 = m x2 + b where (x1, y1) and (x2, 2 are points on the line.
y2 - y1 = m (x2 - x1) or m = (y2 - y1) / (x2 - x1)
For the given points
m = ( 10 - 4) / (2 - 7) = - 6 / 5 for the slope
What is the momentum of a 950kg car moving at 10.0m/s
Explanation:
Momentum = mass × velocity
p = mv
p = (950 kg) (10.0 m/s)
p = 9500 kgm/s
convert 64,000 cm to m
Answer:
64,000 centimeters =640 meters
Answer:
640 metres
Explanation:
100 cm = 1 m
1 cm = 1/100 m
64000 cm = 64000 × 1/100 metres
= 640 metres.
HOPE IT HELPS ◉‿◉
Please help An object is observed to move under the following equation of motion ... x(t) = A√t ... take A =√2. Determine the equations for the velocity and acceleration as a function of time. Write each equation in differential equation format, including second-order, if necessary.
Explanation:
Function of distance w.r.t time :
[tex]x(t) = \: y = \sqrt{2t} [/tex]
Differentiate w.r.t time to get velocity :
[tex] \frac{dy}{dt} = v = \frac{1}{ \sqrt{2t} } [/tex]
Differentiate w.r.t time to get Acceleration :
[tex] \frac{d^2y}{dx^2} = a \: = - \frac{1}{2t \sqrt{2t} } [/tex]
An internal combustion engine has an efficiency of 22.3%. This engine is used to deliver 6.25 x 104 J of work to drive the motion of the train. What is the total energy that needs to be put into the engine.
Answer:
Only about 12%–30% of the energy from the fuel you put in a conventional vehicle is used to move it down the road, depending on the drive cycle. The rest of the energy is lost to engine and driveline inefficiencies or used to power accessories. Therefore, the potential to improve fuel efficiency with advanced technologies is enormous.
Mention any three consequences of gravitational force.
It's Group C question so... :-!
Answer:
[tex] \boxed{ \bold{ \sf{see \: below}}}[/tex]
Explanation:
The force with which any two objects attract each other is called gravitational force. Any three consequences of gravitational force are given below :
The existence of the solar family and constellations.The revolution of planets around the sun.Formation of tides in the sea.Hope I helped!
Best regards!
The gravitational force keeps atmospheric gases available to all living beings, allows the moon to orbit around the earth and the earth to orbit around the sun (causing day and night), and keeps all living beings trapped in the surface of the planet.
Gravity is a fundamental element of nature and can be defined as follows:
It is the element responsible for defining the weight of a body or object.It is responsible for defining the vertical force.It is the force of attraction between two bodies.Through this, we can conclude that gravity is essential for life on the planet and for the functioning of the universe as a whole. This explains the importance of studying and understanding the gravitational force.
You can find more information about this at the link below:
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How would you convert steps and jumps to meters?
Explanation:
by inches to centimeter u can convert to meters
You find a micrometer (a tool used to
measure objects to the nearest 0.001 mm) that has
been badly bent. How would it compare to a new,
high-quality meterstick in terms of its precision? Its
accuracy?
Explanation:
If the micrometer is still in the working condition, it will be hard for the observer to find its accuracy or precision, which could be matched with the meter stick. Its accuracy can be compromised in comparison with the undamaged micrometer, but it would be more chances of highly precise.
The error which is find in the damaged micrometer would be less than as compared to the width of the hash marks on the stick.
Answer:
The bent micrometer will be more precise but less accurate than the meterstick
Explanation: