Answer:
drastic assumption that the car moves along the path at the same speed,
hese failures, it would be necessary to take the time of each type of trajectory, accelerated, constant and decelerated, this method is not easy since it implies knowing the distance in each type of movement,
Explanation:
In this exercise Alfredo makes a drastic assumption that the car moves along the path at the same speed, in reality the car when leaving the first traffic light accelerates until it reaches a speed, then remains constant and decelerates to be able to stop at the second traffic light.
To overcome these failures, it would be necessary to take the time of each type of trajectory, accelerated, constant and decelerated, this method is not easy since it implies knowing the distance in each type of movement, another method would be that the two traffic lights were in green so that the vehicle can run with constant speed throughout the trajectory
Describe a ways car manufacturers try to reduce drag and why.
Aerodynamics is a way to reduce drag that uses car manufacturers.
What is aerodynamic ?
Aerodynamics is the motion of the air. airplane flies cause of aerodynamics.
Aerodynamics is the study of forces that are resulted by motion of the air.
To reduce the aerodynamic drag further, the manufacturers use character lines on the exteriors of the car's body right from its concept stage. These lines help the air to pass smoothly over the body and thus, reducing the air resistance.
cars have flat vertical face in front. When it moves through air, drag force directly proportional to the velocity applies on the car which opposes motion of the car. after studding aerodynamics when we make triangular like shape to the front body of the car, it cuts the air and front air goes from side of the car which reduces oppose to the motion, and car can have more speed.
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7. The position equation, x = x0 + v0t + 1/2at^2, has three terms. Write down the physical significance for each of the three.
Answer:
X0 is the initial position of the object
V0 t is the displacement of the object in time t due to its initial velocity
1/2 a t^2 is the displacement of the object in time t due to its acceleration
Adding the 3 terms (being careful with signs) gives the final position of the object at time t
3. Tyrone wants to determine how fast a bowling ball travels when it is bowled. He uses a stopwatch to
record, in seconds, the time it takes for the bowling ball to reach the pins. Which unit would be most
appropriate to measure the length of the bowling lane?
A. meters
B. kilometers
C. millimeters
D. centimeters
A car moves a distance of 2400 meters in 55 seconds What is the speed of
the car?
[tex]v = \frac{covered \: distance}{time \: of \: the \: covered \: distance} \\ [/tex]
[tex]v = \frac{2400}{55} \\ [/tex]
[tex]v = \frac{24 \times 100}{5 \times 11} = \frac{24 \times 20}{11} = \frac{480}{11} \\ [/tex]
[tex]v = 43.63 \: \: \frac{m}{s} [/tex]
_________________________________
And we're done...
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Answer:
The average speed is about 44 m/s
Step by Step:
[tex]S= \frac{distance}{time}\\ d= 2400m\\t = 55 seconds\\\\\frac{2400m}{55 seconds}\\\\= approximately\\ 44 m/s[/tex]
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I need help with all these. Number them pleaseee
A ball with a mass of 0.5 kg is hit with a force of 2.5 N what is its acceleration?
Explanation:
50 m/s may squared siya sa dun sa may s
A package is dropped from a helicopter that is moving upward at 20.0 m/s.
If it takes 18.0s before the package strikes the ground, how high above the ground was the package when it was released?
Explanation:
We have for velocity of package v= 20 - 9.8t and for distance from the ground y = h + 20t - 4.9t2.We have y = 0 and t = 18.0 s we have h = 4.9·182 - 20·18 = 1227.6 m.Velocity at landing v = 20 - 9.8·18 = - 156.4 m/sA ball is thrown horizontally from a height of 1 m and lands 5 m away. What is the time of flight of the ball?
Answer:
The time of flight of the ball is approximately 0.4515 s
Explanation:
The given information are;
The vertical height, s = 1 m
The horizontal distance travelled, x = 5 m
The direction of the initial velocity = Horizontal
Given that the vertical height is known and the ball is in free fall, the time of flight, t, will depend on the vertical motion of the ball
The equation of motion of the ball can be presented as follows;
s = u·t + 1/2·g·t²
The initial vertical velocity = 0
∴ 1 = 1/2 × 9.81 × t²
t² = 1/(1/2 × 9.81 ) ≈ 0.20387 s²
t = √0.20387 = 0.4515 s
The time of flight of the ball ≈ 0.4515 s.
An object carrying a force of 15N has a mass of 3kg. What is the
acceleration of this object?
Answer:
the acceleration would be 5kg
Explanation:because you would do 15 divided by 5
When momentum is transferred from one object to another, their combined momentum remains the same. * True or False
Answer:
true
Explanation:
hope this helps
1. What are three examples of forces?
Answer: Gravitational force.
Electric force.
Magnetic force.
Nuclear force.
Frictional force.
Explanation: I learned when I had science class.
At a circus, a human cannonball is shot from a cannon at 15m/s at an angle of 40° above horizontal. She
leaves the cannon 2m off the ground and lands in a net 1m off the ground. What height does she reach?
How much ground distance does she cover?
Answer:
a
The height is [tex]H = 6.74 \ m [/tex]
b
The horizontal distance is [tex]D = 23.74 \ m [/tex]
Explanation:
From the question we are told that
The speed is [tex]v = 15 \ m/s[/tex]
The angle is [tex]\theta = 40^o[/tex]
The height of the cannon from the ground is h = 2 m
The distance of the net from the ground is k = 1 m
Generally the maximum height she reaches is mathematically represented as
[tex]H = \frac{v^2 sin^2 \theta }{2 * g } + h[/tex]
=> [tex]H = \frac{(15)^2 [sin (40)]^2 }{2 * 9.8} + 2[/tex]
=> [tex]H = 6.74 \ m [/tex]
Generally from kinematic equation
[tex]s = ut + \frac{1}{2} at^2[/tex]
Here s is the displacement which is mathematically represented as
s = [-(h-k)]
=> s = -(2-1)
=> s = -1 m
There reason why s = -1 m is because upward motion canceled the downward motion remaining only the distance of the net from the ground which was covered during the first half but not covered during the second half
a = -g = -9.8
[tex]u = v sin (\theta)[/tex]
So
[tex]-1 = (vsin 40 )t + \frac{1}{2} * (-9.8) t^2[/tex]
=> [tex]-4.9t^2 + 9.6418t + 1 = 0[/tex]
using quadratic formula to solve the equation we have
[tex]t = 2.07 \ s[/tex]
Generally distance covered along the horizontal is
[tex]D = v cos (40) * 2.07[/tex]
=> [tex]D = 15 cos (40) * 2.07[/tex]
=> [tex]D = 23.74 \ m [/tex]
A cannonball is launched at ground level at an angle of 30° above the horizontal with
an initial velocity of 26 m/s. How far does the cannonball travel horizontally before it
reaches the ground?
Vi =26m/s g = 9.8m/s^2 vf=0
30°
The cannonball travels horizontally before it reaches the ground at an angle of 30° above the horizontal with an initial velocity of 26 m/s is 59.73 meters.
What is velocity?
When anything is moving, its velocity tells us how quickly that something's location is changing from a certain vantage point and as measured by a particular unit of time.
If a point travels a specific distance along its path in a predetermined amount of time, its average speed throughout that time is equal to the traveled distance divided by the travel time. For instance, a train traveling 100 km in two hours is moving at an average speed of 50 km/h.
Given:
The initial velocity of a cannonball, u = 26 m/s,
Calculate the range of the cannonball by following the formula,
R = [tex]u^2[/tex]sin2θ / g
Here R is the range, and θ is the angle of projection.
Substitute the values,
R = [tex]26^2[/tex] sin2*30 / 9.8
R = 59.73 meters
Therefore, the cannonball travels horizontally before it reaches the ground at an angle of 30° above the horizontal with an initial velocity of 26 m/s is 59.73 meters.
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Which change in the medium will likely cause the speed of light waves to decrease?
moving from a solid to a gas
moving from a liquid to a gas
moving from a gas to a liquid
moving from a solid to a liquid
Answer:
D
Explanation:
In an aqueous solution where the H+ concentration is 1 x 10-6 M, the OH concentration must be:
A. 14 x 10-6 M
B. 1 x 10-6 M
C. 1 x 10-7 M
D. 1x 10-8 M
E. 14 x 10-8 M
Answer:
D. 1×10⁻⁸ M
Explanation:
[H⁺] [OH⁻] = 10⁻¹⁴
(1×10⁻⁶) [OH⁻] = 10⁻¹⁴
[OH⁻] = 1×10⁻⁸
The concentration of hydroxyl ion will be [tex]10^{-8}[/tex]M.
What is concentration?The amount of a chemical substance in a mixture is expressed by the substance's concentration.
Calculation of concentration.
Given data:
Concentration of H+ = 1 x [tex]10^{-6}[/tex] M.
It is known that,
[[tex]H^{+}[/tex]][[tex]OH^{-}[/tex]] = [tex]10^{-14}[/tex]M
Now, put the value of concentration of [[tex]H^{+}[/tex]] in above equation.
[1× [tex]10^{-6}[/tex]][[tex]OH^{-}[/tex]] = [tex]10^{-14}[/tex]M
[[tex]OH^{-}[/tex]] = [tex]10^{-14}[/tex] / [1× [tex]10^{-6}[/tex]]M
[[tex]OH^{-}[/tex]] = [tex]10^{-8}[/tex]M
Therefore, the concentration of hydroxyl ion will be [tex]10^{-8}[/tex]M.
Hence, the correct answer will be an option (D).
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The potential energy for a mass on a spring is proportional to the square of which of these quantities?
OA.mass
OB.frequency
OC.period
OD.displacement
O E. velocity
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Answer:
im awesomeee
Explanation:
.
Answer:
Doubt I'll be first but imma try
Explanation:
3.The melting point of lead is 327.5 °C. Which of the following statements is correct? (1 Point) A)Lead is a gas at 280 °C B)Lead is a solid at 310 °C C)Lead is a liquid at 300 °C D)Lead is a solid at 390 °C
Answer:
B)Lead is a solid at 310 °C
Explanation:
The melting point of a substance refers to that temperature in which the substance changes state from solid to liquid. The melting point of a substance, which is usually a temperature value, is that actual temperature the change of state occurs.
According to this question, the melting point of Lead (Pb), which is naturally a solid metal, is 327.5°C. This means that LEAD (Pb) will only change to its liquid state at exactly 327.5°C and above. Therefore, at a temperature of 310°C, which is lower than lead's melting point, Lead element will still be a solid.
Answer: The correct answer is B. Lead is a solid at 310
Explanation:
3. What is the acceleration of a 10 kg mass pushed by a 5 N force?
Answer:
F=ma
Plug it in:
5=10a
5/10=(10a)/10
.5m/s²=a
Explanation:
Brainliest?
Answer:
[tex]\frac{1}{2} \frac{m}{s^2}[/tex]
Explanation:
Recall the equation F = ma. We want to find a, and we already know F and m, so we can plug those in. [tex]5N = 10kg \cdot a -> a = 5N/10kg = \frac{1}{2} \frac{m}{s^2}[/tex]
A crowbar makes our work easier by multiplying effort true or false
Answer:
True
Explanation:
A crowbar makes our work easier by multiply effort because it belongs to first class lever.
And first class lever makes work easier by multiplying the effort
true or false
Impulse is defined as the force exerted on an object times the time it lasts.
Answer: true
Explanation: when two objects collide and completely bounce apart with no lasting deformation or generation of heat, the collision is said to be elastic.
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Cool down math
Which line has a slope of 1?
The line that goes up by 1 and right/left by 1. Hope this helps
In a electrically natural atom of any element there are equal numbers of
Answer: Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion.
What is meant by perfect machine
Answer:
The term ideal machine refers to a hypothetical mechanical system in which energy and power are not lost or dissipated through friction, deformation, wear, or other inefficiencies. Hope this helped :))
Explanation:
What do the words "distance", "force", and "work" have to do with each other?
Answer: the force applied to the object and the distance the object move Work can be calculated with this equation: Work equals Force x Distance.
Explanation:
With the arrangement of colors of ROYGBIV, what is its arrangement based on its energy?
Answer:
red,orange,yellow,green,blue,indigo,violet
Explanation:
Answer:
Longest to shortest wavelength or Highest to lowest frequency
erson jogs 3.5 kilometers in 35 minutes, then 1.5 kilometers in 20 minutes, and finally 1.2 kilometers in 22 minutes. What is the jogger's average speed in km/min?
Answer:
3.5+35
1.5+1.2
20+22
42 + 16
= 58 ¹²
What force is needed to accelerate a 75 kg boy 3 m/s squared on a bike?
Answer:
The answer is 225 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × accelerationFrom the question we have
force = 75 × 3
We have the final answer as
225 NHope this helps you
Joseph drove for 3 hours at the speed of 40 km/h (kilometers per hour) . He changed his speed to 65 km/h for the next 2 hours. How far had Joseph driven in km?
Answer:
Two hundred fifty kilometer 250 km
Which of the following does not affect the solubility of sugar and water
A.crushing up the sugar
B.stirring
C.Temperature
D.adding salt to the water