Answer:
La velocidad media del carro no es ninguna de las ofrecidas como respuesta.
La velocidad es
v = 62.8 m/s
Explanation:
La longitud de una circunferencia de 500 metros de radio es:
L = 2*π*r por sustitución L = 2* 3.14* 500
L = 3140 m esta es la distancia recorrida por el carro de carreras en 50 segundos.
la velocidad media es v v = L / t por definición luego
v = 3140 m/ 50 s v = 62.8 m/s
Which car safety features absorb kinetic energy?
A. Seat belts and air bags
B. Seat belts and crumple zones
C. Seat belts, crumple zones and air bags
Answer:
C
Explanation:
Seat belts absorb kinetic energy when a car crashes because it pulls you back from falling forward given the kinetic energy (and momentum) you had before the crash.
Air bags absorb kinetic energy when a car crashes because it pushes you back from falling forward given the kinetic energy (and momentum) you had before the crash.
Crumple zones absorb kinetic energy when a car crashes because it provides a cushion when the cars crash. Kind of like dropping your phone into a pillow.
I hope this helps! :)
Answer:
C. Seat belts, crumple zones and air bags
Explanation:
All of these car safety features absorb kinetic energy, including seat belts, crumple zones and air bags.
Arches National Park is a desert landscape located in Utah. The park is filled with arches that have been formed by nature. The arches were once solid rock. Over time, extreme temperature changes and windy conditions have caused pieces of rock to crumble and blow away, leaving holes in the rock and forming the arches. Which of these processes is responsible for the formation of the arches?
a.cooling magma
b.weathering and erosion
c.compaction and cementation
d.increased geological pressures
pls helppp thanks you for respond :))))
6) What is the definition of a simple machine? What are the two most basic ones?
7) Is it possible to get more work out of a machine than you put in? Why?
8) What is the official definition of heat energy? What is the source of that energy?
9) Compare and contrast heat with temperature. Explain using a bathtub of warm bath water and a tea-cup of boiling water.
10) Explain what specific heat is. How does it differ from both heat and temperature?
11) What is Latent heat? List all 3 physical constants of water.
Answer:
8) Heat energy is the form energy that is transferred from one object to another with different temperatures. Sun is the source of heat energy.
class 7 Physics answera plot measuring 2 km in length and 1 by 2 km in breadth has area of how many hectare
Answer:
Area of plot in hectare = 100 hectare
Explanation:
Given;
Length of plot = 2 km
Width of plot = 1/2 km = 0.5 km
Find:
Area of plot in hectare
Computation:
Area of plot = Length x width
Area of plot = 2 x 0.5
Area of plot = 1 square kilometer
1 square kilometer = 100 hectare
Area of plot in hectare = 1 x 100
Area of plot in hectare = 100 hectare
Ocean zones can be classified based on distance from Shore into intertidal,
costal ocean, and open oceans.
True or false ?
Answer:
I think true
Explanation:
I hope I'm right and I hope it helps
Answer:
true
Explanation:
basta yun yung sagot ko
How does a valve cause a pressure drop in terms of the individual molecules in the liquid?
The speed of light in vinegar is 2.30 x 10^8 m/s. Determine the index of refraction. (2
Answer:
[tex]n _{v} = \frac{c}{v} \\ = \frac{3 \times {10}^{8} }{2.30 \times {10}^{8} } \\ = 1.30[/tex]
This question involves the concept of refractive index.
The refractive index of the vinegar is "1.3".
What is the Refractive Index?The refractive index is defined as the ratio of the speed of light in air and the speed of light in the given medium which is vinegar here.
[tex]\eta = \frac{c}{v}[/tex]
where,
[tex]\eta[/tex] = refractive index = ?c = speed of light in air = 3 x 10⁸ m/sv = speed of light in vinegar = 2.3 x 10⁸ m/sTherefore,
[tex]\eta = \frac{3\ x\ 10^8\ m/s}{2.3\ x \10^8\ m/s}[/tex]
η = 1.3
Learn more about refractive index here:
https://brainly.com/question/23750645
#SPJ2
Spaceship 1 and Spaceship 2 have equal masses of 150 kg. Spaceship 1 has an initial momentum magnitude of 900 kg-m/s. What is its initial speed?
A. 9 m/s
B. 6 m/s
C. 90 m/s
D. 60 m/s
Answer:
ans: 6 m/s
Explanation:
spaceship 1 has mass= 150kg
initial momentum of spaceship 1 = 900 kg•m/s
we know,
momentum = mass × velocity
so,
velocity = momentum/mass
= 900 / 150
= 6 m/s
since we know it was initial momentum so, velocity is initial speed,
Which of the following types of stars is cooler that an orange main sequence?
Answer:
Not sure but, I think C
Hopefully this helps
Mike roller skates with a constant speed of 10 miles per hour. How long will he take to travel a distance of 15 miles.
Answer:
So every hour he makes 10 miles. So he would take 1 and a half hours to go to Mcdonalds 15 miles away.
Explanation:
[tex]\huge\boxed{{\textsf{90 minutes}}}[/tex]
We know that Mike's speed is [tex]\dfrac{10\ \text{miles}}{60\ \text{minutes}}[/tex] since there are [tex]60[/tex] minutes in an hour, and we know that MIke needs to travel [tex]15[/tex] miles. We'll model this using fractions:
[tex]\dfrac{10\ \text{miles}}{60\ \text{minutes}}=\dfrac{15\ \text{miles}}{x\ \text{minutes}}[/tex]
We can see that there is a [tex]2:3[/tex] ratio here, so we'll divide the left fraction by [tex]2[/tex] and multiply it by [tex]3[/tex] to get the right fraction.
[tex]\dfrac{10}{60}\Rightarrow\dfrac{5}{30}\Rightarrow\dfrac{15\ \text{miles}}{\boxed{90\ \text{minutes}}}[/tex]
What areas of the world would a tidal-power-generating facility be viable? World wide, all coastal cities, lake towns, coastal cities with large tidal range
Answer:
Coastal cities with large tidal range
Explanation:
Tidal-power energy generatgeneration, is a form of renewable energy source of power generation, that makes use of ocean tides and currents kinetic energy to power electricity generating turnines, and paddles connected to an electricity generator, to produce electricity
Therefore, a tidal-generating-facility would be viable in coastal cities with large tidal range
Answer:
Coastal cities with large tidal range
Explanation:
if the weight of 1kg is 10 N in water what is the density of the stone
Answer:
I have a screenshot of this.
Explanation:
A light bulb is connected to two batteries. Each battery has 1.5V. If a student measures the current flowing through the light bulb to be 2 A, What is the resistance of the light bulb?
Answer:
R = 0.75 ohms
Explanation:
Given that,
The voltage of each battery, V = 1.5 V
Current through the light bulb, I = 2 A
We need to find the resistance of the light bulb. We know that,
Ohm's law, V = IR
Where
R is the resistance of the light bulb
Put all the values,
[tex]R=\dfrac{V}{I}\\\\R=\dfrac{1.5}{2}\\\\R=0.75\ \Omega[/tex]
So, the resistance of the light bulb is equal to 0.75 ohms.
When heat is transferred by the
movement of particles it is called..
Answer:
convection
Explanation:
Convection is a mode of heat transfer in which the molecules near the heat source get heated up, expand, become less dense, and rise upwards. The cooler molecules, on the other hand, sink to the bottom and are eventually heated up. Thus the transmission of heat by the movement of heated particles is called convection.
what is the mathematical relationship among voltage current and resistance
Answer:
The relationship between voltage, current, and resistance is described by Ohm's law. This equation, i = v/r, tells us that the current, i, flowing through a circuit is directly proportional to the voltage, v, and inversely proportional to the resistance, r.
A cyclist traveling at 30.0m/s along a straight road comes uniformly to stop in 5.00s. Determine the stopping acceleration, the stopping distance.
Answer:
I. Stopping acceleration = 6 m/s²
II. Stopping distance, S = 75 meters
Explanation:
Given the following data;
Final velocity = 30 m/s
Time = 5 seconds
To find the stopping acceleration;
Mathematically, acceleration is given by the equation;
[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]
Substituting into the equation;
[tex]a = \frac{30 - 0}{5}[/tex]
[tex]a = \frac{30}{5}[/tex]
Acceleration = 6 m/s²
II. To find the stopping distance, we would use the third equation of motion;
[tex] V^{2} = U^{2} + 2aS [/tex]
Where;
V represents the final velocity measured in meter per seconds.
U represents the initial velocity measured in meter per seconds.
a represents acceleration measured in meters per seconds square.
Substituting into the equation, we have;
30² = 0² + 2*6*S
900 = 12S
S = 900/12
S = 75 meters
plz help i dont understand
A vehicle with a uniform velocity of 10ms^-1 is represented by which of the following graphs
Answer:
B.
Explanation:
A position-time graph is a graph of the position of an object against (versus) time. The slope of the line of a position-time graph is typically used to determine or calculate the velocity of an object.
Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.
Mathematically, velocity is given by the equation;
[tex]Velocity = \frac{distance}{time}[/tex]
Uniform velocity can be defined as a situation in which a physical object or body travels equal distances in equal intervals of time along a fixed direction, regardless of how small the interval may be.
During uniform velocity, both the magnitude and direction of the physical object in motion do not change with respect to time. Also, an object in uniform velocity has zero tangential acceleration and its graph is a straight line parallel to the time axis.
Hence, a vehicle with a uniform velocity of 10 meters per seconds (m/s) is represented by Graph B.
What are the positives and negatives of friction?
Answer:
Positives (advantages) of Friction:
Friction is responsible for many types of motion -
It helps us walk on the groundBrakes in a car make use of friction to stop the carAsteroids are burnt in the atmosphere before reaching Earth due to friction.It helps in the generation of heat when we rub our hands.Negatives (disadvantages) of Friction:
Friction produces unnecessary heat leading to the wastage of energy.The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects.Forest fires are caused due to the friction between tree branches.A lot of money goes into preventing friction and the usual wear and tear caused by it by using techniques like greasing and oiling.An object with a mass of 20 kg has a net force of 80 N acting on it. What is the acceleration of the object?
Answer:
the answer is 4m/ s²
hope this helps love!! <3
What is an example of a strong acid?
Brainliest or heart if helpful!
The strong acids are hydrochloric acid, nitric acid, sulfuric acid, hydrobromic acid, hydroiodic acid, perchloric acid, and chloric acid
The framework of the human body consists of: (Select all that apply.)
water
tendons
muscles
lungs
ligaments
skin
bones
Answer:
muscles, skin, and bones.
Explanation: Hope this helps! :)
why does the ball repel as it touches the rod
Answer:
when a charged rod is brought close to the pith balls, their charges polarize. if they find in contact with the charged rod, they can inherit the same sign charge. since like charges repel. when similarly charged, the pith balls behave like siblings and refuse to touch each other.
THANK YOU
If a wire with current 5.0A has 12 coulombs of charge pass through it how much has passed
Answer:
2.4 secs.
Explanation:
Current (A) = Charge (coulomb)/Time(sec)
We are looking for time. So:
Time (sec) = Charge (coulomb)/Current (A)
↓
12coulombs/5.0A = 2.4 secs
A 32.0 kg cart is at rest on a frictionless, horizontal surface. The cart experiences an unbalanced force, causing the cart to
accelerate at a rate of +5 m/s2
After traveling 200 meters, the cart no longer experiences an unbalanced force and did not interact with any other object. Select the response that correctly describes the motion of the cart after 200 meters.
A
The cart’s velocity will continue to increase at a rate of 5 m/s2.
B
The cart’s velocity will decrease because it is no longer accelerating.
C
The cart will return to a state of rest.
D
The cart will continue to travel at a constant velocity.
Answer:
D
Explanation:
the cart will continue to travel at constant velocity
Magali exerts a force of 4.5 N to slide her Blackberry across the table (so she can hide it from Hina!). If she does 2.7 J of work in the process, how far has the Blackberry moved?
Work is equal to the magnitude of the force multiplied by the displacement x. Assuming Magali is pushing the phone, so that the force and displacement point in the same direction, then the work done is positive, and
2.7 J = (4.5 N) x ==> x = (2.7 J) / (4.5 N) = 0.60 m
Even if she was pulling the phone instead, the displacement would be the same, but the work done would be negative and the force would point in the opposite direction, thus also having a negative sign:
-2.7 J = (-4.5 N) x ==> x = 0.60 m
One particular lightbulb has a 0.22-meter length of the tungsten wire used as its filament. This tungsten wire filament has a resistance of 19 ohms at a temperature of 20°C. The tungsten wire filament has a resistance of 240 ohms when this bulb is operated at a potential difference of 120 volts.
Explain why the resistance of the tungsten wire filament increases when the bulb is being operated compared to the resistance of the filament at 20°C.*
Explanation:
An increase in temperature occurs when the bulb is being operated. As resistance is directly proportional to temperature which means that an increase n temperature leads to an increase in resistance of a conductor.
Therefore, resistance of the tungsten wire filament increases when the bulb is being operated compared to the resistance of the filament at 20°C.
Balance the following equations:
1) AI + MnO2
2) Ga + H2SO4
3) Mg + HCI
→ Mn + Al2O3
→ Gaz(SO )3 + H2
→ MgCl2 + H2
Answer:
[tex]1) \: \: \: 4Al+ 3MnO _{2}→ 3Mn + 2Al _{2} O _{3} \\ 2) \: \: \:2Ga + 3H _{2}SO _{4} → Ga _{2} (SO _{4}) _{3} +3 H _{2} \\ 3) \: \: \: Mg + 2HCI→ MgCl _{2}+ H _{2}[/tex]
You lift a 44 N box from the floor and place it on a shelf that is 1.5 m above the ground . How much work did you use in lifting the box ?
Answer:
W = 66 J
Explanation:
Given that,
The weight of the box, W = 44 N
It is placed on a shelf that is 1.5 m above the ground.
We need to find the work done in lifting the box.
We know that,
Work done, W = Fd
So,
W = 44 N × 1.5 m
= 66 J
So, the required work done is equal to 66 J.
Humans are not the only animals that pollute the air Please select the best answer from the choices provided
Тure
False
Answer:
It is True that Humans are not the only animals that pollute the air.
True
Every animal exhales CO2, that's why they pollute the air too, except that it is much less than that of humans.
write down the relation between energy and power
Answer:
Energy is what makes change happen and can be transferred form one object to another. Energy can also be transformed from one form to another. Power is the rate at which energy is transferred. It is not energy but is often confused with energy.
Explanation:
Answer:
when u have energy u will have power n u can work as power is the capacity to do the work
