Answer:
The net force on the hockey puck is zero because it's acceleration is zero due to constant velocity.
The hockey will remain in it's uniform motion unless compelled by an external force.
Explanation:
[tex]from \: vector \: mechanics \\ a = \frac{dv}{dt} \\ but \: at \: constant \: velocity \\ \frac{dv}{dt} = 0 \\ hence : \: \: a = \frac{0}{dt} \\ a = 0[/tex]
HELPPPP PLSSS I NEED HELP
Answer:
D. Pearl Harbor
Explanation:
100 cm cubic of water is mixed with 50 centimetres cubic of concentrated acid of density 1.2 gram per centimetre cube assuming no change in volume find the average density of the mixture the density of water is 1.0 gram per centimetre cube
Answer:
Average Density = 1.07 g/cm³
Explanation:
The average density of the whole mixture is given by the following formula:
[tex]Average\ Density = \frac{mass\ of\ whole\ mixture}{volume\ of\ whole\ mixture}[/tex]
where,
volume of whole mixture = volume of water + volume of acid
volume of whole mixture = 100 cm³ + 50 cm³ = 150cm³
mass of whole mixture = mass of water + mass of acid
mass of whole mixture = (volume of water)(density of water) + (volume of acid)(density of acid)
mass of whole mixture = (100 cm³)(1 g/cm³) + (50 cm³)(1.2 g/cm³)
mass of whole mixture = 160 g
Therefore,
[tex]Average\ Density = \frac{160\ g}{150\ cm^3}[/tex]
Average Density = 1.07 g/cm³
A hydrogen atom and a carbon atom move at the same speed. Which has the greater kinetic energy?
Answer:
The carbon atom has greater kinetic energy than a hydrogen atom.
Hope this helps! :)
Carbon atom has the greater kinetic energy.
What is meant by kinetic energy ?Kinetic energy is defined as the energy attained by a body by virtue of its motion.
Here,
The speed of the hydrogen atom and carbon atom are the same.
Kinetic energy of hydrogen atom, KEн = 1/2 m(н) v(н)²
Kinetic energy of carbon atom, KEс = 1/2 m(с) v(с)²
where m and v are mass and speed respectively.
Taking the ratio,
KEн/KEс = m(н)/m(с)
KEн/KEс = 2/12
KEн/KEс = 1/6
KEс = 6KEн
Therefore the kinetic energy of carbon atom is 6 times the kinetic energy of hydrogen atom.
Hence,
Carbon atom has the greater kinetic energy.
To learn more about kinetic energy, click:
https://brainly.com/question/72216
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which vector is the sum of vectors a and b
Answer:
C
Explanation:
Vector A points up
Vector B points right
The combination must be both up and right which is C
This picture clicked by me
How's it
Answer:
Hey dear
U are a Nice photographer
The pic I awesome.
wow that looks really cool! 9/10
has anyone done this???i need the last questions for 1 and 2
Answer:
no i haven't done it
Explanation:
clean yo computer tho
Which of the following forces can change the motion of an object? A. push B. shove C. pull D. all of these
Answer: The answer is D all of these sorry if i am wrong
Explanation:
This important factor of survival for the coral reef is
a:symbiotic
b: abiotic
c: biotic
D:parasitic
Answer: biotic
Explanation:
CAN SOMEONE PLEASE HELP FIGURE THIS OUT PLEASE
Which statement explains how planets move in orbit as supported by Newton’s first law of motion?
Planets can change the direction of their own orbital path.
Planets can change orbits due to their inertia.
Planets in motion will have a constant speed unless acted on by an outside force.
Planets with a greater mass will orbit more quickly than smaller planets.
the answer is c i think
Answer:
C. Planets in motion will have a constant speed unless acted on by an outside force.
Explanation:
Took the test
19. Two waves traveling in opposite directions on a rope meet and undergo complete destructive interference.
Which of the following best
describes the waves a moment after the waves meet and coincide?
The waves no longer exist.
The waves continue unchanged.
The waves reflect and travel backward.
A single wave continues along the rope.
a.
b.
c.
d.
Answer:
B
Explanation:
In the system shown above, the pulley is a uniform disk with a mass of .75 kg and a radius of 6.5 cm. The coefficient of friction between the 5.8 kg mass and the horizontal surface is .25, and the ropes does not slip on the pulley. They system is released from rest. Use work-energy principles to determine the kinetic energy of the (a) 2.8 kg mass and (b) the pulley after the 5.8 kg mass has moved 2.2 meters.
Answer:
i am answering the same question 3rd time
please find the answer in the images attached.
A car is traveling constant spoed ol 12 12 m/s When the driver accelerates, the car reaches a speed of 26 m/s in s What is the average acceleration of the
Answer:
Average acceleration of the car is 1.167 m/s^2
Explanation:
The speed of car with which it is travelling is 12 m/s
As the driver accelerates the car, the speed reaches 26 m/s
The change in speed in 12 seconds is
26 -12 = 14 m/s
Average acceleration is change in speed divided by time
[tex]\frac{14}{12} \\1.167[/tex] m/s^2
please answer this time question in do not send a link to an unknown website or you are getting reported.
(1) Use Newton's second law: The force F required to accelerate a mass m with acceleration a satisfies
F = m a
So the force needed to accelerate the lion-stretcher system is
F = (175 kg) (2 m/s²) = 350 N
(2) Average speed is defined as the ratio of distance traveled to the time it takes to travel that distance, so in this case the bus's average speed is
(280 km) / (4 h) = 70 km/h
(3) The vertical lines in the plot split up the distance function into 5-minute chunks. The one with the highest average speed is the one over which the distance changes the most. Roughly, the average speeds over each of the given choices is
• 0 to 5 min : (1500 m - 0 m) / (5 min) = 300 m/min
• 10 to 15 min : (3250 m - 2500 m) / (5 min) = 150 m/min
• 15 to 20 min : (3750 m - 3250 m) / (5 min) = 100 m/min
• 25 to 30 min : (4500 m - 4250 m) / (5 min) = 50 m/min
(4) Velocity is a vector, so it has both magnitude and direction. A car moving at constant velocity would be traveling at the same magnitude and direction. But a car on the circular track is constantly turning and changing direction.
What is the main function of b-cells?
B. They attack cells of the body that are infected.
None of these
A. They create antibodies.
They signal other lymphocytes to go after the pathogens.
Answer: They create antibodies.
The mass of a body is 25 kg and the value of acceleration due to gravity is 9.8 m/s^2. Calculate the weight of body.
Explanation:
weight=mass ×acceleration
weight=25×9.8
=245
what celestial body is cloest to earth
Answer:
Mercury
Essentially because Mercury is closest to the Sun, when taking an average over time, Mercury is the closest planet to the Earth, and - in that measure - it is the closest planet to each of the other planets in the Solar System.
Explanation:
I can someone help me and also I gtg so ill be back in a bit
Answer: No sure what to do
Explanation: points for points
who needs more body building food, a father or a child? Why?
Answer:
A Child has a fast metabolism since it is growing fast it needs Food, Liquids, Sleep.
Explanation:
A father has already Grown and is only gaining age.
So we can Conclude that A child needs more body building food.
How many joules are utilized when
warming 5g of steam from 100°C to 120°C?
Answer:
Q=mc(T2-T1)
Explanation:
Ti is the temperature
m is mass
c is specific heat capacity for steam
Q is heat, [Q]=J
4. Un móvil viaja en línea recta con una velocidad media de 1200 cm/s durante 9 s, y luego con velocidad media de 480 cm/s durante 7 s, siendo ambas velocidades del mismo sentido: a) ¿cuál es el desplazamiento total en el viaje de 16 s? B) ¿cuál es la velocidad media del viaje completo?
Answer:
A) El desplazamiento total del viaje es 14160 centímetros.
B) La velocidad media del viaje completo es 885 centímetros por segundo.
Explanation:
A) El desplazamiento es el producto de la velocidad media por el tiempo. El desplazamiento total es la suma de desplazamientos asociados a cada velocidad media, entonces:
[tex]x = \left(1200\,\frac{cm}{s}\right)\cdot (9\,s)+ \left(480\,\frac{cm}{s} \right)\cdot (7\,s)[/tex]
[tex]x = 14160\,cm[/tex]
El desplazamiento total del viaje es 14160 centímetros.
B) La velocidad media del viaje es el desplazamiento total dividido por el tiempo total, es decir:
[tex]\bar v = \frac{14160\,cm }{16\,s}[/tex]
[tex]\bar v = 885\,\frac{cm}{s}[/tex]
La velocidad media del viaje completo es 885 centímetros por segundo.
Increased global temperature may lead to more forest fires, longer droughts, and loss of habitat. How will this effect many species? *
Answer:
Many species will be affected by increased global temperatures due to following reasons as mentioned.
As snow at poles will continue to melt and habitat for many species will be lost. This is create imbalance in the food chain of oceans which are prime source of food for many species. Some species will thrive as their hunters will be eradicated due to loss of habitat and overall food chain balance will be disturbed. This will cause species to go extinct.
The cycle of rain will be disturbed causing an imbalance in water cycle which will cause droughts and species will suffer and die eventually will go extinct.
Which force is always attractive and has a very small range? strong nuclear O weak nuclear O gravitational electromagnetic
Answer:
Strong nuclear
Explanation:
Took a quiz on this and got it right
Answer:
Strong nuclear
Explanation:
A car starts from rest with an acceleration of 5.0 m / s² and travels a distance of 1.0 km. What is the speed value of this car?
Answer:
100 m/s
Explanation:
We'll begin by converting 1 km to m. This can be obtained as follow:
1 km = 1000 m
Finally, we shall determine the final velocity of the car. This can be obtained as follow:
Initial velocity (u) = 0 m/s
Acceleration (a) = 5.0 m/s²
Distance (s) = 1000 m
Final velocity (v) =?
v² = u² + 2as
v² = 0² + (2 × 5 × 1000)
v² = 0 + 10000
v² = 10000
Take the square root of both side
v = √10000
v = 100 m/s
Therefore, the speed value of the car is 100 m/s.
A double slit produces a diffraction pattern that is a combination of single and double slit interference. Find the ratio of the width of the slits to the separation between them, if the first minimum of the single slit pattern falls on the fifth maximum of the double slit pattern. (This will greatly reduce the intensity of the fifth maximum.)
Answer:
The ratio of the width of the slits to the separation between them is 1:5
Explanation:
For this set of question
n = 1, m = 5
As we know for nth minimum
[tex]D sin\theta =n \lambda[/tex]
For mth Maximum
[tex]d sin\theta =m \lambda[/tex]
From the above two equations we get
[tex]Sin\theta = \frac{1*\lambda}{D} \\d * \frac{1*\lambda}{D} = 5 *\lambda\\\frac{D}{d} = \frac{1}{5}[/tex]
The ratio of the width of the slits to the separation between them is 1:5
The speed of light is 300,000,000 m/s. Red light has a wavelength of 0.0000007 m. What is its frequency?
Answer:
2.33..
Explanation:
f = wavelength/speed
= 0.0000007/300000000
= 2.333...
What are tectonic plate boundaries?
A areas where Earth’s core experiences a high amount of stress
B areas where Earth’s core experiences a low amount of stress
C areas where Earth’s crust experiences a high amount of stress
D areas where Earth’s mantle experiences a high amount of stress
Answer:
c
Explanation:
Answer:
Areas where earth crust experiences a high amount of stress
Explanation:
FCAT review question
Which of the following is the best example of a heat conductor?
Answer:
Anything with a dark shade in color and with no reflective surface or any metalExplanation:
In this case, a dark shirt or blanket would be a heat conductor as well as metal would be, too
A paved blacktop parking lot was built on what was
once a soil-covered field. This area will now
experience increased runoff when rain occurs because
the paved parking lot has
A) less capillarity B) less permeability
C) greater infiltration D) greater porosity
Answer:
The answer is B. less permeability.
Explanation:
Which feature causes a gap in the geologic record?
extrusion
fault
intrusion
erosion
Answer:
A
Explanation:
Answer : a. Extrusion