Answer:
I think they use it at night because they want to avoid involving themselves in road accident while crossing the street. When there are reflective strips on their clothes, drivers do notice them even at far ends of the street since the strips will reflect the rays from the car lights to the driver,hence, the driver notifies that there is a pedestrian crossing and therefore slows down.
If a skateboarder is moving at 4 meters per second then changes its velocity to 10
meters per second over the course of 10 seconds what is the skateboards acceleration?
Answer:
i was doing this is it actually 0.6
Explanation:
;D
The acceleration of the skateboard from its initial velocity to the final velocity over the given time is 0.6m/s².
What is Motion?Motion is simply the change in position of an object over time.
From the First Equation of Motion;
v = u + at
Where v is final velocity, u is initial velocity, a is acceleration and t is time elapsed.
Given the data in the question;
Initial velocity u = 4m/sFinal velocity v = 10m/sTime elapsed t = 10sAcceleration of the skateboard a = ?To determine the acceleration of the skateboard, we substitute our given values into the expression above.
v = u + at
10m/s = 4m/s + ( a × 10s)
( a × 10s) = 10m/s - 4m/s
a × 10s = 6m/s
a = 6m/s ÷ 10s
a = 0.6m/s²
Therefore, the acceleration of the skateboard from its initial velocity to the final velocity over the given time is 0.6m/s².
Learn more about Equations of Motion here: brainly.com/question/18486505
Explain why written communication in science is important. I’ll give brainlest!!!!!!! Help me
A jet starts at rest at the end of a runway and reaches a speed of 80 m/s in 20 s. What is its acceleration?
Answer:
80/2= 40 m/s^2.
Explanation:
A jet starts at rest at the end of a runway and reaches a speed of 80 m/s in 20 s. Its acceleration is 4 m/sec².
What is acceleration?The rate at which an item changes its velocity is known as acceleration, a vector quantity. If an object's velocity is changing, it is acceleration.
The net acceleration that objects get as a result of the combined action of gravity and centrifugal force is known as the Earth's gravity, or g. It is a vector quantity whose strength or magnitude is determined by the norm and whose direction correlates with a plumb bob.
acceleration = change in velocity / time
acceleration = 80 / 20
acceleration = 4 m/sec²
A jet starts at rest at the end of a runway and reaches a speed of 80 m/s in 20 s. Its acceleration is 4 m/sec².
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How many gallons fit in a 500.mL Nalgene bottle?
Note: 1 Liter (L)= 0.264 gal
Answer:
Glass & Plastic Bottle Measuring Systems Definitions. Milliliter (ml): Milliliters are used in the metric measurement system to measure units of liquid volume. One milliliter is equal to one cubic centimeter or 1/1000 of a liter…
Explanation:
Which of these animals would be measured to have the most mass? an elephant a goldfish a dog a fox
Answer:
An elephant.
Explanation:
The amount of matter contained inside a body is called its mass. It is independent of the location of the object. It remains the same always.
Out of the four options we need to tell which animals would be measured to have the most mass. It is very clear that, an elephant has most mass. It is very huge in size of three other animals.
Hence, the correct option is (A).
Answer:
I think its a Elephant
Explanation:
A car traveling at 26.8m/s hits the brakes to slow down before turning into a neighborhood. Determine how fast it is going after slowing down at a rate of -8.2m/s2 for 14.3seconds.
Answer:
The speed of the car after the break was applied is 90.46 m/s
Explanation:
Given;
initial velocity of the car, u = 26.8 m/s
accelertation of the car, a = -8.2 m/s²
time of motion, t = 14.3 s
final velocity, v = ?
Apply the following kinematic equation;
v = u + at
v = 26.8 + (-8.2 x 14.3)
v = 26.8 - 117.26
v = -90.46 m/s
magnitude of the final velocity = 90.46 m/s
Therefore, the speed of the car after the break was applied is 90.46 m/s
A transmitter produces radio waves of wavelength 1500m. It takes the waves 0.025s to travel from transmitter to radio receiver.
What is the distance between the radio transmitter and the receiver?
A) 5 × 10³ m
B) 2 × 10⁵ m
C) 7.5 × 10⁶ m
D) 1.1 × 10¹⁰ m
Answer:
[tex]7.5 \times 10 {}^{6} [/tex]
Explanation:
Speed of electromagnetic waves=
[tex]3 \times 10 {}^{8} ms[/tex]
m/s
[tex] = 3 \times 10 {}^{8} ms \times 0.025[/tex]
[tex] = 3 \times 10 {}^{8} \times \frac{1}{40} [/tex]
[tex] = 7.5 \times 10 {}^{6} m[/tex]
Help me! I need to know this for my Veterinarian unit in class. Why do cats hate water?
Another reason why cats hate water is attributed to their history. There is not much in a cat's background to recommend them for successful interactions with bodies of water, be it small or big. Cat's ancestors lived in dry arid places which means rivers or oceans weren't obstacles they had to face.
Hope this helps:)
A boat sailed 560 km in 8 hrs. It took three hours to travel the first 150 km. What was it’s average speed for the remaining journey?
Answer:
82 km/h
Explanation:
Given that A boat sailed 560 km in 8 hrs. It took three hours to travel the first 150 km. That is,
The remaining distance will be:
560 - 150 = 410 km
the remaining time will be:
8 - 3 = 5 hours
For the remaining Journey, average speed will be:
Speed = distance/time
Speed = 410/5
Speed = 82 km/h
Therefore, the average speed for the remaining journey will be 82 km/h
True or False: You walk across a carpet and accumulate a net negative charge on the soles of your shoes. When you touch your sister with your finger and give her a small zap, the charge that accumulated on your finger is due to charging by contact.
Answer:
True
Explanation:
Charging by conduction occurs when a charged conductor comes in contact with an uncharged conductor, leading to the sharing of charges between both conductors. Contact charging leads to a sharing and distribution of the same type of charges on the two conductors.
In this case, your entire body is charged by the sole of your feet coming in contact with the charged carpet on the floor, leading to a charge buildup all over your body.
A 1.35 kgkg block is attached to a spring with spring constant 15.0 N/mN/m . While the block is sitting at rest, a student hits it with a hammer and almost instantaneously gives it a speed of 34.0 cm/scm/s . What are
Given :
Mass of block , m = 1.35 kg .
Speed constant , k = 15 N/m .
Speed at centre , v = 34 cm/s = 0.34 m/s .
To Find :
The amplitude of oscillation .
Solution :
Now , we know total energy is conserved in SHM .
So , K.E at zero displacement :
[tex]K.E=\dfrac{mv^2}{2}\\\\K.E=\dfrac{1.35\times 0.34^2}{2}\\\\K.E=7.8\times 10^{-2}\ J[/tex]
Now , this K.E is equal to maximum P.E :
[tex]P.E=K.E=7.8\times 10^{-2}\ J[/tex] .
[tex]P.E=\dfrac{kA^2}{2}\\\\7.8\times 10^{-2}=\dfrac{kA^2}{2}\\\\A=\sqrt{\dfrac{2\times 7.8 \times 10^{-2}}{15}}\ m\\\\A=0.1019 \ m\\\\A=10.2\ cm[/tex]
Therefore , the amplitude is 10.2 cm .
Hence , this is the required solution .
Ft-Fg= ma solve for Ft?
Arrange the following lengths in their increasing magnitude 1 meter, centimeter, 1 kilometer, 1 millimeter
Answer:
1 millimetre, 1 centimeter, 1 meter, 1 kilometer
Hope it helped u if yes mark me BRAINLIEST
A boy wishes to make
a catapults out of
a rubber band of width 9mm and thickness 1.55mm. Determine the length of the band
he must use so that when the stretches it by 0.25
of its natural length and releases it, the velocity of the pebble of mass 0.0006kg is
30ms - Take the youngs modulus of the rubber
to be 4x10000000nm-2
For this car, predict the shape of a graph that shows distance (x) versus time (t). Note that time is the independent variable and will be on the bottom axis.
the pressure of gas is 13.6 CM of HG what does this mean
Answer:
it means it has pressure of 13.6 CM mercury on an area
Ohnny walks 900 meters to the store to buy a candy bar. He then walks back home. His total trip took him 30 minutes. What was his average speed? 0 points 1 m/s 10 m/s 30 m/s 27,000 m/s
Answer:
Average speed = 1 m/s
Explanation:
Given that,
Ohnny walks 900 meters to the store to buy a candy bar. He then walks back home. It would mean that the total distance covered by him is 900 m + 900 m = 1800 m
His total trip took him 30 minutes or 1800 seconds
We need to find the average speed. It is equal to the total distance divided by the total time taken. So,
[tex]v=\dfrac{1800\ m}{1800\ s}\\\\v=1\ m/s[/tex]
So, his average speed is 1 m/s.
The what’s the difference does it mean velocity and vector Quantity is the same
Answer:
No they are totally different...
Velocity is displacement/time. while vector is both magnitude and direction.....
Velocity is a vector quantity because it has both magnitude and direction
What year was volleyball invented?
10 p
1889
1874
1895
1918
How many players are on each volleyball team?
Please help
6. Explain what it means to have your hypothesis “refuted".
Answer:
Your hypothesis would be proven wrong.
Explanation:
To have a hypothesis be refuted, your hypothesis would be able to be proven wrong. A hypothesis has to be able to be supported and refuted, or proven wrong.
A plant is moved from direct sunlight and placed into complete darkness.
Which structure in the plant's cells would be most affected by this change?
Choose 1 answer:
(Choice A)
A
Mitochondria
(Choice B)
B
Chloroplast
(Choice C)
C
Vacuole
(Choice D)
D
Golgi body
a,
Explanation:
because when its moved thats the sugar of it
Answer:
b. Chloroplast
Explanation:
What's the main reason why people use graphs
What is the importance of Scientific Notation and Significant Figures?
Answer:
they're important because they simplify the results of the comparison
Car A of mass 1500 kg travelling at 25 m/s collides with another car B of mass 1000 kg travelling at 15 m/s in the same direction. After collision, the velocity of car A becomes 20 m/s. Calculate the velocity of car B after collision.
Answer:
Apparently this has been asked a few years ago, so I copied this answer from deepikakvvk06 - - all credit goes to them!
velocity of car 'B' after collision is 22.5m/s. //it's a conservation of momentum question
Explanation:
Let ,
mass = m
initial velocity = u
final velocity = v
here ,
m₁= 1500 kg
m₂=1000 kg
u₁ = 25 m/s
u₂ = 15 m/s
v₁ = 20 m/s
we have to find v₂ !!
v₂ is the velocity after collision
Here is a formula relating the values given ,
m₁u₁+m₂u₂ = m₁v₁ + m₂+v₂
m₁u₁+m₂u₂ = 1500 × 25 + 1000 ×15
= 37500 + 15000
= 52500
m₁v₁ + m₂+v₂ = 1500 × 20 + 1000 × v₂
= 30000 + 1000v₂
m₁u₁+m₂u₂ = m₁v₁ + m₂+v₂
52500 = 3000 + 1000v₂
1000v₂ = 52500 - 30000
1000 v₂ = 22500
v₂ = 22500/1000
= 22.5 m/s
Thus, velocity of car 'B' after collision is 22.5m/s.
If the wave speed stays the same, which of the following decreases as the frequency increases?
Answer:yes
Explanation:
The slope of a linear position graph tells us the blank of the object
Answer:
velocity of the object
Explanation:
For an object moving at a constant acceleration, we would expect to see a position graph with a curved shape and a velocity graph with a straight shape.
The slope of a linear position graph tells us the velocity of the object.
What is velocity?In physics, velocity is the rate of change of an object's position with respect to time. It is a vector quantity, meaning that it has both magnitude and direction. The magnitude of velocity is called speed.
The slope of a linear position graph is calculated by dividing the change in position by the change in time. The units of slope are meters per second (m/s) or feet per second (ft/s).
A positive slope indicates that the object is moving to the right, while a negative slope indicates that the object is moving to the left. The steeper the slope, the faster the object is moving.
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what is the dependent variable
Answer:
a variable (often denoted by y) whose value depends on that of another.
13. A chemical costs $5.25 per pound. What would be the cost of 10.0 kg of the chemical?
Answer:
$ 115.76
Explanation:
From the question given above:
1 pound of a chemical cost $ 5.25
To obtain the cost of 10 Kg of the compound, we must convert 10Kg to pound. This can be obtained as follow:
1 Kg = 2.205 pound
Therefore,
10 Kg = 10 Kg / 1 Kg × 2.205 pound
10 Kg = 22.05 pound
Therefore, 10 Kg is equivalent to 22.05 pounds
Finally, we shall determine the cost of 22.05 pounds as follow:
1 pound of a chemical cost $ 5.25.
Therefore, 22.05 pounds of the chemical will cost =
22.05 pound / 1 pound × $5.25
= $ 115.76
Therefore, 10 Kg (i.e 22.05 pound) of the chemical cost $ 115.76
Which of the following is the primary function of the nucleus? Choose 1 answer: Choose 1 answer: (Choice A) A Breaking down unnecessary materials (Choice B) B Absorbing sunlight (Choice C) C Producing ATP for the cell (Choice D) D Storing genetic material
Answer:
D) D Storing genetic material
Explanation:
Answer:
D) D Storing genetic material
Explanation:
The car was initally traveling at 25 m/s. The car slows with a negative acceleration as shown. How long does it take the car to slow to a final velocity of 2.0 m/s?
Answer:
t = 2.35sExplanation:
Using one of the equation of motion expressed as v = u+at where;
v is the final velocity = 2.0m/s
u is the initial velocity = 25m/s
a is the acceleration = -a (since the acceleration is negative)
t is the time taken
Substituting the given parameters into the formula above;
2.0 = 25-9.81t
subtract 25 from both sides
2.0 - 25 = 25-9.81t - 25
-23 = -9.81t
Divide both sides by -9.81
-23/-9.81 = -9.81t/-9.81
t = 23.0/9.81
t = 2.35s
Hence it took the car 2.35s to slow to a final velocity of 2.0 m/s