Answer:
In the free fall motion we have that the acceleration is constant and produced by gravity, this acceleration has a magnitude of 32 ft/s2 or 9.8 m/s2 depending on the units you are working with. This means that every second the speed changes a magnitude of 32 ft/2, the velocity will depend of whether the ball is going upward (positive) or downward (negative).
A) At the highest point the ball stops to start the descend, here v=0 ft/s
B) +32 ft/s. The vector is going up, in the next second the velocity is going to be 0 (negative acceleration)
C) V=vf-vo=0-32=-32 ft/s is the constant change in velocity in projectile motion
D) -32 ft/s. The vector is pointing downward
E) V=vf-vo=-32-0=-32 ft/s is the constant change in velocity in projectile motion, 32 ft/s per second
F) Delta V=vf-vo=-32-32=-72 ft/s
g) gravity acceleration is constant 32 ft/s2 (pointing downward vector)
Which photon has more energy?
A. All photons have the same energy.
B. A photon of an infrared light
C. A photon of red light
D. A photon of micro wave.
A soccer ball accelerates as it rolls down a steep hill and then gradually comes to a stop at the bottom. According to Newton's laws which of the following statements could be
true?
Statement 1: While the ball was rolling down the hill the forces acting on it were unbalanced.
Statement 2: The ball was experiencing balanced forces as it rolled down the hill..
Statement 3: Balanced forces acted on the ball once it reached the botto by m of the hill causing it to stop.
O Statement 1 and 2 are both true.
All three statements are true.
Only Statement 1 is true.
Only Statement 3 is true.
0
Answer:
Statement 1: While the ball was rolling down the hill the forces acting on it were unbalanced.
Explanation:
What is the mathematical relationship between these three values? 0.78 seconds, -9.81 m/s^2, and -7.68 m/s. I need help with this, please.
The mathematical relationship between time, acceleration and velocity is given by: [tex]Acceleration = \frac{v\;-\;u}{t}[/tex]
In Physics, the acceleration of an object or body can be defined as the rate of change of velocity with respect to time.
Hence, acceleration is calculated by subtracting initial velocity from the final velocity and dividing by the time.
Mathematically, acceleration is given by the formula;
[tex]Acceleration = \frac{v\;-\;u}{t}[/tex]
Where:
v is the final velocity measured in meter per seconds (m/s).u is the initial velocity measured in meter per seconds (m/s).t is the time measured in seconds.Also, the acceleration of an object or body is measured in meter per seconds squared ([tex]m/s^2[/tex]).
Read more: https://brainly.com/question/8898885
Suppose an empty grocery cart starts at a rest and rolls downhill in a parking lot. The cart has a maximum speed of 2.2km/s when it hits the side of the store and comes to rest 1.5 min later. If an unbalanced force of 65 N stops the cart, what is the mass of the grocery cart?
Answer: i dont know
Explanation:
E
An election accelerated through 1 kV possesses de - Broglie wavelength 1. What will be the wavelength of
the same electron, when accelerated through 16kV:
1) 161
2) 41
3) 1/4
4) 116
Answer:
Correct option is
B
1.7
A
˚
λ=
p
h
=
2mE
h
=
2mqV
h
λ=
2×9.1×10
−31
×1.6×10
−19
×50
6.6×10
−34
=1.72×10
−10
=1.72A
Option B
Marsha's car accelerates at an average rate of 3 m/s2. How long does it take for her car to speed up from 10 m/s to 15 m/s?
Explanation:
We are going to use the following equation:
[tex]v = v_0 + at \Rightarrow t = \dfrac{v - v_0}{a}[/tex]
[tex]t = \dfrac{15\:\text{m/s} - 10\:\text{m/s}}{3\:\text{m/s}^2}[/tex]
[tex]\:\:\:\:=1.67\:\text{s}[/tex]
what would you want individuals and communities to understand to help them avoid negatively affecting climate
Answer:
ur
Explanation:
mom
An airplane flying upward at 39.6m/s and an angle of 30 degree relative to the horizontal releases a ball when it is 287m above the ground. Calculate the time it takes the ball to hit the ground? Calculate the maximum height of the ball? Calculate the horizontal distance the ball travels from the release point to the ground? Neglect any effects due to air resistance.
Answer:
Assuming the speed of the plane is 39.6 m/s
vy = 39.6 * sin 30 = 19.8 vertical speed
vx = 39.6 * cos 30 = 34.3 m/s
S = vy t - 1/2 a t^2 to calclulate vertical height
-287 = 19.8 t - 4.9 t^2
4.9 t^2 -19.8 t - 287 = 0
I get t = 9.93 for solving the quadratic for time for ball to hit ground
Horizontal distance = 34.3 m/s * 9.93 s = 341 m
With a vertical speed of 19.9 m/s it takes 19.8 / 9.8 = 2.02 s to reach max height
You can again solve a quadratic or use 19.8 / 2 * 2.02 for time to reach vertical height H = 287 + 20 = 307 m
As a check 307 = 1/2 g t^2 = 4.9 * (9/93 - 2/02)^2 = 307 m max height
After you know how long the ball is in the air there are several ways to calculate the other values.
16. If "team A has 3 of its bocce balls closer to the pallino than any of their opponent's balls, who wins the
frame
How many points do they get for that frame?
How many do their opponents get for that frame?
Answer:
Team A wins the frame with three points. The opposing team gets zero points for the frame.
Explanation:
Một chất điểm chuyển động trong mặt phẳng Oxy với phương trình :
{ = 2 + 10
Answer:
plz write your questions in English
A horse trainer records the distance a horse travels during three different trials.
What is the horse's average speed in kilometers per minute?
The horse's average speed in kilometers per minute is equal to 0.3 kilometers per minute.
Given the following data:
Time 1 = 15 minutesTime 2 = 30 minutesTime 3 = 45 minutesDistance 1 = 4.5 kilometersDistance 2 = 9.0 kilometersDistance 3 = 13.5 kilometersTo determine the horse's average speed in kilometers per minute:
First of all, we would find the total time and total distance covered:
For total time:
[tex]Total \;time = 15 + 30+45[/tex]
Total time = 90 minutes
For total distance:
[tex]Total \;time = 4.5 + 9.0+13.5[/tex]
Total time = 27 kilometers.
Mathematically, average speed is given by the formula:
[tex]Average\;speed = \frac{Total\;distance}{Total\;time} \\\\Average\;speed = \frac{27}{90}[/tex]
Average speed = 0.3 kilometers per minute.
Read more on average speed here: https://brainly.com/question/17742679
Một quả cầu khối lượng m được nối giữa hai đầu đoạn dây AB và CD như hình vẽ. Biết r
ằng, độ bền của hai đoạn dây AB và CD là như nhau. Nếu kéo đầu D của sợi dây bởi lực kéo có độ lớn tăng dần một cách từ từ thì
A. dây sẽ bị đứt đồng thời tại hai đoạn AB và CD.
B. đầu tiên dây sẽ bị đứt tại CD, sau đó đứt tại AB.
C. dây sẽ bị đứt tại phần CD.
D. dây sẽ bị đứt tại phần AB.
Answer:
B
Explanation:
B
a 1500 kg car accelerates at a rate of 40m/s what is the amount of force
Hi there!
Use the following equation: (Newton's Second Law)
∑F = ma, where:
∑F = net force (J)
m = mass (kg)
a = acceleration (m/s²)
Plug in the given values:
∑F = 1500 · 40 = 60,000 J
Which of the following CANNOT be
picked with magnet?
A Safety pins
B
Coins
C Cork
D Needle
E Chain
Answer:
Well, there is a kind of magnet to pick up a coin.. I think you can pick up a needle with one too.. I think safety pins. depending on what its made of though.
Explanation:
Answer:
cork cannot be picked with a magnet
Explanation:
i hope that helps
Calculate the potential energy of a 1.5 kg hammer that is located at a height of 2 m
Answer: 29.43 Joules
Explanation:
PE=mgh
PE=potential energy
M=1.5kg
G=9.81m/s^2
H=2m
PE=29.43J
Answer:
[tex]\boxed {\boxed {\sf 29.4 \ J}}[/tex]
Explanation:
Potential energy is the energy an object possesses due to its position. It is calculated using the following formula:
[tex]PE=mgh[/tex]
The mass of the hammer is 1.5 kilograms and its height is 2 meters. Assuming this is on Earth, the acceleration due to gravity is 9.8 meters per second squared.
m= 1.5 kg g= 9.8 m/s² h= 2 mSubstitute these values into the formula.
[tex]PE= (1.5 \ kg)(9.8 \ m/s^2)(2 \ m)[/tex]
Multiply the numbers together.
[tex]PE=(14.7 \ kg *m/s^2)(2 \ m)[/tex]
[tex]PE=29.4 \ kg*m^2/s^2[/tex]
Convert the units. 1 kilogram meter squared per second squared is equal to 1 Joule. Our answer of 29.4 kg*m²/s² is equal to 29.4 J.
[tex]PE= 29.4 \ J[/tex]
The potential energy of the hammer is 29.4 Joules.
The three diagrams below show a block of mass m being pulled or pushed at constant acceleration ax along a table with a force P. The coefficient of kinetic friction is k. What is the friction force in each case? Give your answer in terms of the pushing force P, ax, m, and the angle .
Answer:
Explanation:
1) F = ma
P - Fk = ma
Fk = P - ma
2) F = ma
Pcosθ - Fk = ma
Fk = Pcosθ - ma
3) F = ma
Pcosθ - Fk = ma
Fk = Pcosθ - ma
These results are not very helpful.
If we are allowed to introduce gravity, more useful information comes out
1) Fk = kmg
2) Fk = k(mg + Fsinθ)
3) Fk = k(mg - Fsinθ)
In this exercise we have to use the decomposition of forces in the blocks, so
1) [tex]F_k = P - ma[/tex]
2) [tex]F_k = Pcos\theta - ma[/tex]
3) [tex]F_k = Pcos\theta - ma[/tex]
Thus, observing these blocks and their respective compositions we will find that:
1)
[tex]F = maP - F_k = maF_k = P - ma[/tex]
2)
[tex]F = maPcos\theta - F_k = maF_k = Pcos\theta - ma[/tex]
3)
[tex]F = maPcos\theta - F_k = maF_k = Pcos\theta - ma[/tex]
See more about forces at brainly.com/question/19734564
3. a) If the distance between two objects increases by a factor of 5 (5),
does the gravitational force between the objects increase or decrease?
By what factor does the gravitational force between the objects
change?
b) If the mass of one object decreases by a factor of 3 (*1/3), does the
gravitational force between them increase or decrease? By what factor
does the gravitational force between the objects change?
Answer:
Answer for A
Explanation:
F1=GmM/r1^2
If r2 becomes r2=5r
F2=GmM/(25r^2)
Multiply with 25 gives to maintain the same force
I.e.,25F2=F1
F2=G(25m)M/25r^2=F1
By the factor 25 would change to increase to same.
How do we measure the amplitude of a wave? (Plzz help my sister, 17 points!!!!)
1.crest to trough
2.crest to crest
3.trough to trough
4.crest to rest position
Answer:
U calculate from CREST to REST POSITION
Government has banned the use of plastic bags in some states. Why?
Answer:
people throw plastic into the oceon
Explanation:
.when people throw plastic into the ocean mother nature gets hurt because of waste if it continues the see we see today will be dirty if all of humanity throwed all of the plastic and waste in the ocean
what is the main features of RCCB?
Main features of RCCB are:
Both wires phase and neutral are connected through RCCB.Whenever there is any ground fault occurs, then it trips the circuit.The number of current supplies through the line should go back through neutral.These are a very effective type of shock protection.If a car is traveling at 10m/s and then accelerates for 10s at a rate of 0.5m/s^2,what will be final velocity?
Answer:
[tex]u= 10 \frac{m}{s} \\ t = 10 \: s \\ a = .5 \frac{m}{ {s}^{2} } \\ v = x \\ v = u + at \\ x = 10 + .5 \times 10 \\ x = 10 + 5 \\ x = 15 \frac{m}{s} \\ thank \: you[/tex]
Answer:
15m/s
Explanation:
a=(Vf-Vi)/t
0.5m/s^2=(Vf-10m/s)/10s
when we solve this Vf=15m/s^2
A 0.15-kg object is projected vertically into the air with a
velocity of 30. m/s. How high above the ground is the
object after 3.3 seconds?
A 46 m
B 53 m
C 110 m
D 150 m
Answer:
A
Explanation:
y = 30(3.3) - .5(9.8)(3.3^2)
A speedboat with a mass of 511 kg (including the driver) is tethered to a fixed buoy by a strong 31.5 m cable. The boat's owner loves high speed, but does not really want to go anywhere. So the owner revs up the boat's engine, makes a lot of noise, and runs the boat in circles around the buoy with the cable supplying all the necessary centripetal force. When the tension of the cable is steady at 13300 N, with what force is the boat's engine pushing the boat? Different physics textbooks treat drag force somewhat differently and use different formulas. For the present purpose, take the water's drag force on the boat to be (450 kg/m)×2, where denotes the boat's speed. Ignore any drag force on the cable.
Answer:
its is 23.09 kb
Explanation:
i did this awsner
HELP PLEASE
......................................................
Do you think it wise to make a decision under the influence of an emotion?
Answer:
no because It can be a disadvantage for us
Answer:
no
Explanation:
nop it isn't wise to make a decision under the influence of emotion because if you act and make decision From influence of emotion you will gonna regret so think before you make decision
Which term best describes a question that can be tested?
A. Phenomenon
B. Hypothesis
C. Experiment
D. Observation
Answer:
Hypothesis
Explanation:
because in science a hypothesis is a guess/question that you test. it can be changed many times
Answer:
C) experiment. Is the answer.
hypothesis is the educated guess about what the result of the experiment is before conducting the experiment.
Observation is what you see and record during the experiment.
Random sampling is used by researchers to obtain an).
control group
population of interest
representative sample
experimental sample
Plz help
Answer:
hey there
the correct answer is option ( B ) population of interest
Explanation
A random sample is a subset of individuals randomly selected by researchers to represent an entire group as a whole. The goal is to get a sample of people that is representative of the larger population.
Explanation:
Hope it helps
Have a nice day : )
What’s the atomic number for magnesium
Answer:
12
Explanation:
Symbol: Mg
Atomic mass: 24.305 u
Atomic number: 12
Density: 1.738 g/cm³
A 50 kg boy on ice skates throws a 5 kg ball to the left. If the ball ends up going 20 m/s. How fast is the boy going?
Answer:
2 m/s
Explanation:
A 50 kg boy on ice skates throws a 5 kg ball to the left. If the ball ends up going 20 m/s. Velocity of boy is 2 m/sec.
What is velocity?When an item is moving, its velocity is the rate at which its direction is changing as seen from a certain point of view and as measured by a specific unit of time.
Uniform motion an object is said to have uniform motion when object cover equal distance in equal interval of time within exact fixed direction. For a body in uniform motion, the magnitude of its velocity remains constant over time.
Given in the question, a 50 kg boy on ice skates throws a 5 kg ball to the left. If the ball ends up going 20 m/s.
Using conservation of momentum, velocity = (20*5)/50 = 2 m/sec.
A 50 kg boy on ice skates throws a 5 kg ball to the left. If the ball ends up going 20 m/s. Velocity of boy is 2 m/sec.
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If you ran at a rate of 300 m/min for 30 minutes, how far would you have run?
Answer:
9000 m
Explanation:
I multiplied 300 by 30!
Hope this helps :)
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