A ball is thrown straight up. If the launch velocity is 15 m/s, at what SPEED will the ball return to the thrower’s hand?
a) -15 m/s
b) -9.8 m/s
c) 15 m/s
d) 0 m/s
Answer:
Vf = 15 m/s
Explanation:
First we consider the upward motion of ball to find the height reached by the ball. Using 3rd equation of motion:
2gh = Vf² - Vi²
where,
g = acceleration due to gravity = -9.8 m/s² (negative sign for upward motion)
h = height =?
Vf = Final Velocity = 0 m/s (Since, ball momentarily stops at highest point)
Vi = Initial Velocity = 15 m/s
Therefore,
2(-9.8 m/s²)h = (0 m/s)² - (15 m/s)²
h = (-225 m²/s²)/(-19.6 m/s²)
h = 11.47 m
Now, we consider downward motion:
2gh = Vf² - Vi²
where,
g = acceleration due to gravity = 9.8 m/s²
h = height = 11.47 m
Vf = Final Velocity = ?
Vi = Initial Velocity = 0 m/s
Therefore,
2(9.8 m/s²)(11.47 m) = Vf² - (0 m/s)²
Vf = √(224.812 m²/s²)
Vf = 15 m/s
The density of water is 1.00 g/mL. This means if a rock has a density of 0.87 g/mL, it will ____in water.
a) float
b) sink
Answer:
Float
Explanation:
It is given that,
The density of water is 1 g/mL
The density of a rock is 0.87 g/mL
It can be seen that the density of water is more than that of rock. The density of an object is calculated from its mass and volume.
If the density of liquid in which it is placed, is more that that of the object, it will float at the top.
Hence, in this case the rock will float.
In 1993, Ileana Salvador of Italy walked 3.0 km in under 12.0 min. Suppose that during 115 m of her walk Salvador is observed to steadily increase her speed from 4.20 m/s to 5.00 m/s. How long does this increase in speed take?
Answer:
t = 25 seconds
Explanation:
Given that,
Distance, d = 115 m
Initial speed, u = 4.2 m/s
Final speed, v = 5 m/s
We need to find the time taken in increasing the speed.
We know that,
Acceleration, [tex]a=\dfrac{v-u}{t}[/tex] ....(1)
The third equation of kinematics is as follows :
[tex]v^2-u^2=2ad\\\\\text{Put the value of a in above equation}\\\\v^2-u^2=2\times \dfrac{v-u}{t}\times d\\\\\because (a^2-b^2)=(a-b)(a+b)\\\\(v-u)(v+u)=\dfrac{2\times (v-u)d}{t}\\\\t=\dfrac{2d}{v+u}\\\\\text{Putting all the values}\\\\t=\dfrac{2\times 115}{4.2+5}\\\\t=25\ s[/tex]
Hence, it will take 25 seconds to increase the speed.
The second image !!!!!!
Answer:
Explanation:
No, not any of these substance will float in Methanol , simply because Methanol has a density of 0.79 g, if you put any substance that weighs more than 0.79 g, it will sink, it all depends on the weight if it is more or less than methanol
2: D=m/v
D=135/50 = 2.7 g/cm³ ( Aluminum)
D=M/V
if two objects has the same mass but one has larger volume, then te one with larger volume has less density
example : 2 objects
mass of both=350
volume of the first one=500 and the other 750
D1=M1/V1 = 350/500 =0.7
D2 = M2/V2 = 350/750 = 0.4666
D1 is larger than D2( with larger volume )
what is 404.2 rounded to the nearest ten thousandth?
Answer:
The answer to your question is 404.2000
A forklift does 450 J of work to lift a 150 N hot tub. How high is the hot tub lifted? Round your answer to the nearest whole number
Answer:
3 m
Explanation:
[tex]work \: = force \times displacement \\ 450 = 150 \times displacement \\ displacement = 3m[/tex]
Sal sprints 40 m to the right in 5.5s.
What was his average velocity in m/s?
Answer:
7.27 m/s
Explanation:
You would be dividing 40 (distance) by 5.5 (time) to get the average velocity of 7.27 m/s .
Answer:
7.27
Explanation:
40/5.5=7.27
Please help on this physics question
Answer:
you need to include the units for both axis to be able to answer this
Explanation:
average speed in uniform motion is the slope anywhere on the line but you could always pick 2 points and do it that way and speed is just rise over run
or y2-y1/x2-x1
Pick two points on the line and determine their coordinates.
Determine the difference in y-coordinates of these two points (rise).
Determine the difference in x-coordinates for these two points (run).
Divide the difference in y-coordinates by the difference in x-coordinates (rise/run or slope).
the second bit i think they are looking for this calculation y = mx + b, where m is the slope and b is the y-intercept (where the line crosses the y axis (the vertical one that has no units
Then use that formula for the last question and put in the x value of 10 and complete the formula to find out what y is
2. Convert 750 m/s to km/hr.
Answer:
2700
Explanation:
1m/s=3.6km/hr
QUESTION: Is there a relationship between height and shoe size? Write a one sentence
summary of your graph.
J
Answer:
There is no particular relationship between the height and shoe size. But the shoe sizes in males is usually bigger than females. And the shoe size tends to get bigger when the person is taller.
Explanation:
PLS HELP. A flatbed car of a train moves 8 m/s to the east. A jogger runs along to top the flatbed car (which is not very safe) with a velocity of 6 m/s to the west. How fast is the jogger moving?
Answer:
2 m/s
Explanation: Given that a flatbed car of a train moves 8 m/s to the east. A jogger runs along to top the flatbed car (which is not very safe) with a velocity of 6 m/s to the west.
Since the jogger is moving in an opposite direction to the direction of the train, and velocity is the distance covered in a specific direction, the jogger will be moving at a velocity relative to the velocity of the train.
Velocity = (8 - 6) m/s
Velocity = 2 m/s
Therefore, the jogger will be moving at the speed of 2 m/s
what weights include barbells and dumbbells
55. A dog starts at the origin and runs forward at 6 m/s for
1.5 s and then turns around to fetch the ball by
running backward at 7 m/s for 3 s. If the dog runs
back to the origin at 4 m/s, then how much time has
elapsed between the start and when he returns with
the ball?
0-
Position vs. time
61
-5
-10
Position (m)
-15
-20
-250
0.2
0.8
1.0
1.2
0.4 0.6
Time (s)
Answer:
7.5 seconds
Explanation:
Given that a dog starts at the origin and runs forward at 6 m/s for 1.5 s
From speed formula
Speed = distance/time
Substitute speed and time into the formula
6 = distance/1.5
Distance = 6 × 1.5 = 9 m
and then turns around to fetch the ball by
running backward at 7 m/s for 3 s. If the dog runs.
Calculate the distance covered
Distance = 7 × 3 = 21 m
This means that the dog ran beyond the original position.
The elapsed distance = 21 - 9 = 12m
back to the origin at 4 m/s, by covering distance 12 m
Calculate the time.
Speed = distance/time
Time = 12/4 = 3s
The time elapsed between the start and when he returns with the ball will be:
T = 1.5 + 3 × 3
T = 7.5 seconds
What conversion do you use to change 18 km to meters
Answer:
multiplication
Explanation:
multiply your distance of 18 kilometers by 1,000 to get 18,000 meters.
In the lab, you looked at speed-time graphs to determine the acceleration of the cart for each of the three fan
speeds.
What was the acceleration of the cart with Low fan speed?
cm/s2
What was the acceleration of the cart with Medium fan speed? cm/s2
What was the acceleration of the cart with High fan speed?
cm/s2
Answer:
(I). The acceleration of the cart with low fan speed is 18 cm/s²
(II). The acceleration of the cart with medium fan speed is 23.3 cm/s²
(III). The acceleration of the cart with high fan speed is 32 cm/s²
Explanation:
Given that,
You looked at speed-time graphs to determine the acceleration of the cart for each of the three fan speeds in the lab.
According to graph,
A , B and shows the high, medium and low fan speeds respectively.
We know that,
The speed-time graph shows the acceleration.
Acceleration is equal to the rate of change of velocity.
(I). We need to calculate the acceleration of the cart with low fan speed
Using formula of acceleration
[tex]a_{l}=\dfrac{v_{f}-v_{i}}{t_{f}-t_{i}}[/tex]
Put the value from graph
[tex]a_{l}=\dfrac{125-0}{7}[/tex]
[tex]a_{l}=18\ cm/s^2[/tex]
(II). We need to calculate the acceleration of the cart with medium fan speed
Using formula of acceleration
[tex]a_{m}=\dfrac{v_{f}-v_{i}}{t_{f}-t_{i}}[/tex]
Put the value from graph
[tex]a_{m}=\dfrac{140-0}{6}[/tex]
[tex]a_{m}=23.3\ cm/s^2[/tex]
(III). We need to calculate the acceleration of the cart with high fan speed
Using formula of acceleration
[tex]a_{h}=\dfrac{v_{f}-v_{i}}{t_{f}-t_{i}}[/tex]
Put the value from graph
[tex]a_{h}=\dfrac{160-0}{5}[/tex]
[tex]a_{h}=32\ cm/s^2[/tex]
Hence, (I). The acceleration of the cart with low fan speed is 18 cm/s²
(II). The acceleration of the cart with medium fan speed is 23.3 cm/s²
(III). The acceleration of the cart with high fan speed is 32 cm/s²
Answer:
18.0, 24.0, 32.0
Explanation:
just did it
A proton and a neutron are each close to a positive nucleus.
How does the charge on the nucleus affect the proton and the neutron, if at all?
A The neutron is attracted; the proton is repelled.
B The neutron is not affected; the proton is repelled.
C The proton is attracted; the neutron is repelled.
D The proton is not affected; the neutron is repelled.
Answer: b
Explanation:Because protons are positive and the nucleus is positive so it will be repelled and the neutron is neutral so it will be unaffected.
A swimming pool is an example of an open system. The pool loses 10,500 J
of its thermal energy to the surrounding air at night, and the surrounding air
adds 2,500 J of thermal energy to the pool in the morning. According to the
law of conservation of energy, what is the total change in energy?
Answer: A a decrease of 8000
Explanation: 10,500 - 2,500= 8000
Answer:
Its A
Explanation: Sure
how far will a skateboard travel in 30 seconds if traveling at a speed of 3 m/s
As the earth rotates through one revolution, a person standing on the equator traces out a circular path whose radius is equal to the radius of the earth (6.38×10^6). What is the average speed of this person in meters per second? If we are standing in latitude 43° north what is our average speed?
Answer:
The average speed will be "1038 mph".
Explanation:
Period for one revolution is:
T = 24 hours
= 86,400 sec
x = c = 2πr
The given values is:
r = 6.38×10⁶ m
Now,
⇒ [tex]T=\frac{2 \pi r}{v}[/tex]
Or,
⇒ [tex]v=\frac{2 \pi r}{T}[/tex]
On substituting the values, we get
[tex]=\frac{2 \pi (6.38\times 10^6)}{86,400}[/tex]
[tex]=464 \ min/sec[/tex]
[tex]=(464 \frac{min}{sec}) (\frac{3600 \ sec}{1 \ hour} )(\frac{1 \ mi}{1609 \ m} )[/tex]
[tex]=1038 \ mph[/tex]
If you want to know your speed going from point A to point B, what
information do you need to know?*
Answer:
the distance between point a and b and the time it takes to get from a to b.
Explanation:
d/t =v
The table shows results of an experiment that was replicated. Which best describes the data? They are neither precise nor reproducible. They are precise but not reproducible. They are accurate and reproducible. They are accurate but not reproducible.
Answer:
They are accurate and reproducible.
Explanation:
Answer:
They are precise and reproducible.
Explanation:I just took the test on Edgenuity
HELP ME PLZ!!!!! I'LL DO ANYTHING!!!!
First find the diameter of each.
Jupiter’s diameter is 86,881 mi.
Earth’s diameter is 7,917.5 mi.
Then divide those two.
Rounded, Jupiter is 11 times larger.
unrounded: 10.9732870224186927691821913482791285127
Finding out how large something is compared to something can be done by dividing.
For example I have two dogs. One dog is 3 feet tall. The other is 2 feet tall. How much taller is dog one? Dog one is 1.5 times larger because 3/2 = 1.5 AND 2 x 1.5 = 3.
So for this case multiplying Earth’s diameter by 10.9732870224186927691821913482791285127 will give you Jupiter’s diameter.
Why do we use percent deviation rather than simply expressing the size of the error itself?
Answer:
the percentage we have the fraction between the error and the magnitude,
Explanation:
When absolute error is used, it is a value that remains constant regardless of the magnitude of the measurement, for large measurements it can represent great accuracy, but for small measurements the accuracy may be low, for example> if we use a tape measure with error of Dx = 0.1 cm if the measurement is 1 meter this error is acceptable, but if the measurement is 1 cm the error is too big.
When we use the percentage we have the fraction between the error and the magnitude, so if this relationship is small the measure is very tight and but if the relationship is high the measure has little pressure, for example
Δx = 1 cm = 0.01 m
% = 0.01 / 1 100 = 1%
% = 0.01 / 0.01 100 = 100%
therefore the precision of the measurement is known the percentage error
A car accelerates from rest at 7.2 m/s 2 . How much time does it need to attain a speed of 4 m/s? Answer in units of s.
Answer:
The time is 0.6 sec.
Explanation:
Given that,
Acceleration of car = 7.2 m/s²
Speed = 4 m/s
We need to calculate the time
Using equation of motion
[tex]v=u+at[/tex]
Where, u = initial velocity
v = final velocity
a = acceleration
t = time
Put the value in the equation
[tex]4=0+7.2\times t[/tex]
[tex]t=\dfrac{4}{7.2}[/tex]
[tex]t=0.6\ sec[/tex]
Hence, The time is 0.6 sec.
difference between weightlessness in space and weightlessness in earth
In space we feel weightlessness because the earth's gravity has less effect on us. The Earth's gravitational attraction at those altitudes is only about 11% less than it is at the Earth's surface. If you had a ladder that could reach as high as the shuttle's orbit, your weight would be 11% less at the top.
1. The speed limit on a particular freeway is 28.0 m/s (about 101 km/hour). A car
that is merging onto the freeway is capable of accelerating at 2.25 m/s2. If the car
is currently traveling forward at 13.0 m/s, what is the shortest amount of time it
could take the vehicle to reach the speed limit? How far would the car travel in
this time?
Answer:
the speed limit 6 seconds and the car will travel in 90m
PLEASE HELP!!!
Elements located in the vertical column of the periodic table are of the same _______ and have _______ chemical properties.
A. group
B. period
C. similar
D. different
E. style
F. unlike
Answer:
I think its A & C
Explanation:
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.
Elements located in the vertical column of the periodic table are of the same group and have similar chemical properties, therefore the correct answer is option A and option C.
What is the atomic number?The total number of protons present in an atom is known as the atomic number of that atom.
While the atomic mass of an atom is the sum of the total number of protons and the number of neutrons present inside any atom.
The element belonging to the same group have approximately similar chemical behavior while on the other hand element belonging to the same period would have the same outermost shell.
The correct response is option A and option C because elements included in the vertical column of the periodic table belong to the same group and have comparable chemical characteristics.
Learn more about the atomic number here, refer to the link ;
brainly.com/question/14190064
#SPJ2
What is the unit of pressure? Why is it called a derived unit?
Why has SI system
Answer:
pascal
Explanation:
its obtained after either division or multiplication
If the acceleration of a motorboat is 4.0 m/s2, and the motorboat starts from rest, what is its velocity after 6.0 s?
Answer:
The velocity of the motorboat after 6s is 24 m/s.
Explanation:
Given;
acceleration of the motorboat, a = 4.0 m/s²
initial velocity of the motorboat, u = 0
time of motion of the motorboat = 6s
Apply the following kinematic equation to determine the velocity of the motorboat after 6 ;
v = u + at
v = 0 + (4 x 6)
v = 24 m/s
Therefore, the velocity of the motorboat after 6s is 24 m/s.
6.P.2.1 Matter: Properties and Changes Notes
The Theory ______
of Conservation
of
states:______
cannot be
or!____________
height
is anything that has
(weight) and height
(takes up space).
A
is the
in an object.
is the
an object takes
to add speaker notes
Answer:
The __law__ conservation
of state that either energy may produced nor destroyed