Answer:
5.4 seconds
Explanation:
use the formula v(final)= v(initial)+at
0=13.5-2.5t
-13.5=-2.5t
t=5.4
How do stars serve as evidence for the expansion of the universe and the Big Bang theory?
Answer:
The Doppler red-shift of light observed from distant stars and galaxies gives evidence that the universe is expanding (moving away from a central point). This allows for Big Bang Theory, because after a “bang” occurs all of the matter moves away from the point of origin.
The mass of a solid cube is 1370 g, and each
edge has a length of 5.18 cm.
Find the density of the cube.
Answer in units of kg/m3
Answer:
D=m/v
Explanation:
1.37kg/1.3899m cube
0.9927kg meter cube
Joe runs 30 meters in 5 seconds. He then rests for 15 seconds. Joe runs another 20 meters in 5 seconds. What is joes average speed
Answer:
His average speed is through 4-6.
Explanation:
Because if you divide them both by 5 you get 4 and 6.
Based on its location on the periodic table, which metal is likely to be less reactive than rubidium and more reactive than calcium?
a) potassium (K)
b) cesium (Cs)
c) magnesium (Mg)
d) titanium (Ti)
Answer:
A i think tell me if i got it right
Explanation:
Based on the location on the periodic table, Potassium (K) is the metal that will be less reactive than rubidium and more reactive than calcium.
2. Rusting is an
example of a
a. physical property.
b. physical change.
C. chemical property.
d. chemical change.
Answer:
rusting is a chemical property because it is irreversible it changes the identity of a substance
Answer:
C. chemical property
Explanation:
a chemical property of iron is that it is capable of combining with oxygen to form iron oxide，the chemical name of rust
A sled covers 20 m from rest and achieves a velocity of 9 m/s under constant acceleration. What is the acceleration of the sled?
Answer:
Explanation:
Givens
d= 20 m
vi = 0
vf = 9 m/s
a = ?
Equation
vf^2 = vi^2 + 2 * a * d
Solution
9^2 = 0 + 2*a*20
81 = 2*a * 20
81 = 40*a
a = 81/40
a = 2.025
A gravitational field is generated by any object that has
Answer:
two poles
Explanation:
Convert 6.6 meters to centimeters
Answer:
6.6 Meters = 660 Meters
Explanation:
1 Meter = 100 Centimeters
A liquid has a volume of 0.040 and a mass of 30000 what is the density?
Answer:
0Explanation:
Density = Mass/Volume = 0.040/30000 = 0 I hoped this helps you ☺️☺️Thank you ☺️☺️
Force is defined as
Change in momentum b)rate of change of momentum
c)The quantity that opposes inertia d)The quantity that keeps the velocity constant
Answer:
c) the quantity that opposes inertia
A plane moving at a horizontal velocity of 205 m/s drops a piece of cargo which lands 7500 m below. How high is the cargo after 3.5 seconds?
Answer:
well im not gonna give the full answer but the hint im going to give is tht u can use a calculator
Explanation:
You pull a sled with a package on it across a snow-covered flat lawn. If you
apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. What is the
combined mass of the package and the sled? (Assume there is no friction.)
Answer:52.5
Explanation:
You pull a sled with a package on it across a snow-covered flat lawn. If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg
The given data to find Mass,
The force applied to the sled, F = 65.1 N
Acceleration of the sled, a = 1.24 m/s²
What is force?Forces are defined by both strength and direction.
Force is a vector quantity. It is a quantity that is described by Magnitude and Direction. The strength of a force is its magnitude and the direction, well it is the direction the magnitude is applied on the object.
We need to find the combined mass of the package and the sled. Let it is m. Using definition of force as follows :
F = ma
m = F/a
m = 65.1 /1.24
Mass, m = 52.5 Kg.
If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg
Hence, Option C is the correct answer.
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What charges attract and what charges repel??
Answer:
The same charges repel and different charges attract
Explanation:
+ and + repel
- and - repel
+ and - attract
- and + attract
As trends in global warming continue, people are becoming more and more concerned about the possible effects on specific habitats. Coral reefs and polar ice caps are just two of the many endangered ecosystems due to global warming. The monitoring of life on Earth gives rise to career opportunities in the field of A) ecology. B) genetics. C) medicine. D) animal behavior.
Answer
nbbbbbbbbbbbbbbbbbbbsn
Answer:
a ecology
Explanation
L nathaliedog
Rasheed ran down the football field at a speed of 7m/s. If he got to the end in 23
seconds, how far did he actually run?
Answer:
The answer is 161 mExplanation:
To find the distance covered we use the formula
distance = velocity × timeFrom the question
velocity = 7 m/s
time = 23 s
We have
distance = 7 × 23
We have the final answer as
161 mHope this helps you
what is the net force on a car stopped at a stop sign? what is the net force on a car moving in a straight line with a constant speed?
place /our live /music / important / has / in / an
Answer:
Music has an important place in our lives.
the efficiency of transformer is not 100%why?
Answer:
Hysteresis, Eddy current, flux leakage and resistance of winding are those four reasons. It is impossible to overcome this four reasons, Hence transformer never be 100% efficient.
Explain the meaning of the name "black hole". This should be 2-3 sentences. Hint- relate this to density and how it effects things. *
if you put something like apiece of cardboard between a magnet and a iron nail, the magnet still holds the nail. how?
Which best describes why heat pumps are reversible?
O They can heat and cool an indoor space.
O They involve a metal expanding or contracting against another.
They combust and can also add coolant.
They allow a piston to move up and down.
Answer:
I would say the first one.
A: They can heat and cool an indoor space.
Explanation:
Reversible heat pumps are capable of providing both heating and cooling processes using the same two environments. When heating, they use the external pipes to absorb heat and release that heat into the indoor environment. When cooling, they absorb the heat from indoors and release that heat into the outside environment.
Answer:
A
Explanation:
Energy must be measured in
Answer:
joule
Explanation:
hop it helps give a good rate ples
Answer:
joule
Explanation:
How much clothes should be applied on 100 cm² area using pressure of 25 Pa
Answer:
hi !
Pressure = Force/Area
Force = Pressure*Area
Pressure = 25 Pa
Area = 100 cm² = 0.01 m²
F = 25*0.01
= 0.25 N
Explanation:
3. What is the instantaneous speed of a car after 3 seconds that is traveling at 30 m/s and accelerates at a constant
rate of 10m/s??
A bus is moving at a constant speed of 30 m/s. How many hours will it take to travel 200 miles?
Answer:
200/67.1224321241 = 2.97962981482 hours to travel 200 miles.
Hope this helps :)
Explanation:
First, convert the speed of the bus back to km/h so it makes things easier. The bus is going at an unreasonably high seed of 108 km/h and will usually result in a crash caused by the driver being unable to control the bus at such high speeds, even it won’t topple over at an inclination of 28 degrees for double decker buses (when the bus is stationary. If the prototypes can’t meet this requirement, the prototype fails the safety test and won’t be used as a bus for carrying passengers).
If you ignore that problem, we will start to do the calculation. 108 km/h is equal to 67.1224321241 mph, so it would take 200/67.1224321241 = 2.97962981482 hours to travel 200 miles.
2.97962981482 hours is equal to 2 hours, 58 minutes, 46 seconds, 667 milliseconds, 333 microseconds and 352 nanoseconds.
Here is the list of descending order of time magnitude of smaller than one second for extra information.
Decisecond = 0.1 second (one tenth)
Centisecond = 0.01 second (one hundredth)
Millisecond = 0.001 second (one thousandth)
Microsecond = 0.000001 second (one millionth)
Nanosecond = 0.000000001 second (one billionth)
Picosecond = 0.000000000001 second (one trillionth)
Femtosecond = 0.000000000000001 second (one quadrillionth)
Attosecond = 0.000000000000000001 second (one quintillionth)
Zeptosecond = 0.000000000000000000001 second (one sextillionth)
Yoctosecond = 0.000000000000000000000001 second (one septillionth)
Planck time = 0.00000000000000000000000000000000000000000001 second
Planck time is the smallest measurable time interval in theory.
Please help me plzzzzz
Answer:
what
Explanation:
-A pool ball leaves a 0.70 meter high table with an initial velocity of 2.4 m/s. Predict the time required for the pool ball to fall to the ground.
-A rock is thrown with a velocity of 23.7 m/s horizontally off the top of a bridge and lands in the water 35.0 meters away. What is the vertical velocity just before the rock hits the water below?
-A plane moving at a velocity of 205 m/s drops a piece of cargo which lands 6.5 seconds later. How far did the cargo box land after it's release?
Answer:
0.70+2.4=23.7+35.0=answer
Explanation:
Answer:
First Question:
If the initial velocity is horizontal: It doesn't really matter how fast it is going horizontally if we want to calculate time.
Since it rolled off the table, the initial vertical velocity is 0. The displacement will be -0.7 meters since the table is 0.7 meters high. The acceleration will be -9.8 m/s^2 because that's just earth's gravity.
We can plug the variables into the formula Displacement = Initial Velocity*Time + 1/2*Acceleration*Time^2:
[tex]-0.7 = 0\cdot t + 1/2\cdot-9.8\cdot t^2\\-0.7 = -4.9*t^2\\t^2 = \frac{10}{7} \\t = \sqrt{\frac{10}{7}}[/tex]
Rounded to the nearest hundredths, the answer is 1.2 seconds.
Second Question:
We can use the horizontal variables to find out the time to solve for the vertical velocity.
The acceleration is going to be 0(assuming no air resistance), the initial velocity is going to be 23.7 m/s, and the displacement is going to be 35.0 meters.
Again, we can plug the variables into the formula Displacement = Initial Velocity*Time + 1/2*Acceleration*Time^2:
[tex]35 = 23.7\cdot t + 1/2\cdot 0\cdot t^2\\35 = 23.7\cdot t\\t = \frac{35}{23.7}[/tex]
Rounded to the nearest hundredth, t = 1.48.
Now, we're going to find the vertical variables:
The acceleration will be -9.8 m/s^2 because that's just earth's gravity. The initial velocity will be 0 because the rock was launched horizontally. The time, as calculated before, is 1.48.
Now, we can plug t into the formula Velocity = Initial Velocity + Acceleration *Time:
[tex]v = 0 + -9.8\cdot1.48\\v = -14.504[/tex]
Rounded to the nearest hundredth, the answer is -14.5 meters per second.
Third Question:
Let's find the horizontal variables:
Assuming no air resistance, the final velocity is 205 m/s. The initial velocity will also be 205 m/s. The time will be 6.5 seconds.
We can use the formula Displacement = (Final Velocity+Initial Velocity)/2 * Time. In this case, the final velocity and the initial velocity are the same, so the formula reduces to Displacement = Final Velocity * Time:
[tex]d = 205\cdot6.5\\d = 1332.5[/tex]
Therefore, the answer is 1332 meters.
I really hoped this helped you because I spent more than 1 hour explaining. If you have more questions don't hesitate to ask. If it helped you, please consider giving me brainliest? :)
Debby and Ben took different routes to travel from Point A to Point E. Debby took the
route along A, B, C, D, and E. Ben took the route along A, G, F, and E. Debby and Ben
both took 4 hours to complete their walk. Their routes are shown.
Route in miles
D2 E
End
B2C
li
F
2
LL
3
10
Start
G
A
Which statement is true about Debby and Ben's average speed?
Debby's average speed was twice Ben's average speed,
Ben and Debby's average speed was the same,
Debby's average speed was three times Ben's average speed,
Ben's average speed was twice Debby's average speed.
How long will it take a cyclist to accelerate to 12 m/s starting from rest if he rides with an average acceleration of 1.2 m/s^2?
"using acceleration formula"
Answer:
The cyclist takes 10 seconds to accelerate to 12 m/s.
Explanation:
Constant Acceleration Motion
It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.
Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:
[tex]v_f=v_o+at[/tex]
Solving for t:
[tex]\displaystyle t=\frac{v_f-v_o}{a}[/tex]
The cyclist starts from rest (vo=0) and moves at vf=12 m/s with an acceleration [tex]a=1.2\ m/s^2[/tex].
Calculate the time:
[tex]\displaystyle t=\frac{12-0}{1.2}[/tex]
[tex]\displaystyle t=\frac{12}{1.2}[/tex]
[tex]\boxed{t=10\ sec}[/tex]
The cyclist takes 10 seconds to accelerate to 12 m/s.
Why is circular motion at constant speed not a natural state of motion?
The reason behind circular motion at constant speed is not a natural state of motion is centripetal acceleration acting on it.
What is centripetal acceleration?
Centripetal acceleration is a characteristic of an object's motion along a circular path. Centripetal acceleration applies to any item travelling in a circle with an acceleration vector pointing in the direction of the circle's center.
A natural state of motion is that motion where object moves with constant velocity and no acceleration. As in circular motion of an object at constant speed, a constant centripetal acceleration remains, this is not a natural state of motion.
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