A car accelerates from 1.5 to 18 m/sec in 9.6 seconds. Calculate its acceleration. and the other one is During a race, you speed up from 2.2 m/sec to 4 m/sec in 3.2 seconds. (a) What is your change in speed? ____ m/sec (b) What is your acceleration? ___ m/sec2
Answer:
(1) The acceleration is 1.72 m/s²
(2) (a) The change in speed is 1.8 m/s
(2) (b) The acceleration is 0.563 m/s²
Explanation:
(1)
Given;
initial velocity, u = 1.5 m/s
final velocity, v = 18 m/s
time of motion, t = 9.6 s
The acceleration is given by;
a = (v - u) / t
a = (18 - 1.5) / 9.6
a = 1.72 m/s²
(2)
Given;
initial speed, u = 2.2 m/s
final speed, v = 4 m/s
time of motion, t = 3.2 s
(a) The change in speed is given by;
Δv = v - u
Δv = 4 m/s - 2.2 m/s
Δv = 1.8 m/s
(b) the acceleration is given by;
a = Δv / t
a = 1.8 / 3.2
a = 0.563 m/s²
Can an object have a positive position, but a negative velocity? Explain your reasoning.
Answer:
Yes
Explanation:
A position describes the position of an object relative to the x/y-axis (or the four cardinal directions). A velocity is a vector quantity, defining speed with direction.
So if an object is in a positive position, it means they are in the positive x-axis direction (or wherever on the scale the positive values are stated to be) and if it has a negative velocity, it means said object is moving in the opposite direction of the positive x-axis. It is possible for the object to still be in the positive position as it's moving with a negative velocity
Which model of the atom has electrons traveling in specific paths around the nucleus? Bohr's model Rutherford's model Thomson's model Dalton's model
Answer:
A, Bohr's model
Explanation:
Took the quiz, hope it's right for you.
(The other three did have something to do with it they just didn't create that specific model)
The model of the atom that has electrons traveling in specific paths around the nucleus is Rutherford's model.
Therefore, the correct answer is option B
J. J Thomson proposed that the atom is a sphere of positively charged matter in which negatively charged electron are embedded.
In Rutherford's model of atomic structure, the electrons moves in orbits by electrostatic attraction to the positively charged nucleus.
According to Dalton's atomic theory, atom were indestructible and indivisible solid particle.
Bohr's model made assumption that electron can only exist in circular orbits of definite quantum energy.
According to the question, the model of the atom that has electrons traveling in specific paths around the nucleus is Rutherford's model.
Therefore, the correct answer is option B
Learn more here : https://brainly.com/question/16776207
Help PLZ ;)
If the distance between two objects increases, what happens to the force of gravity between them?
(A) Increases
(B) Decreases
(C) Stays the same
Answer:
B) Decreases
Explanation:
Gravitational force is inversely proportional to distance. As distance between 2 objects increase, gravitational force between the 2 objects decreases.
Hope this helps!
Answer:
The answer would be B
Explanation:
12. Describe Binding energy and how it plays a role in nuclear fusion up to 56Fe (the synthesis of iron
nuclei). Include a description of the relationship between the strong nuclear force, the
electromagnetic force, and the number of nucleons involved in the fusion in your answer.
Help me on thiss one once again ughh ! asap ! hurry
You walk east for 30 m, then decide to walk north foranother 30 m. What is the angle of direction of your displacement?
Answer:
Displacement is 42.426 m NE and the angle is opposite/adjacent or 30/30 which would equal 1 degree which doesn't seem right but hopefully its an answer.
Explanation:
What is the relationship between the tilt of the Earth on its axis, latitude, and temperature?
Answer:
The combination of more direct rays of sunlight and more hours of daylight causes the hemisphere tilted toward the sun to receive more solar radiation and to have warmer temperatures. When the Northern Hemisphere is tilted toward the sun, latitudes between the equator and 90°N (the North Pole) are experiencing summer.
Hope this helps :) :) :)
A car travels at a constant speed of 70 km/hr for 15 minutes. The car decreases its speed from 70 to 40 km/hr over the next two minutes and then continues to travel at a constant speed of 40 km/hr for the next 5 minutes Which of the following graphs best represents the car's motion during the given time period?
Answer:
A car travels at a constanT
A rocket lifts vertically off the launching pad and reaches a final velocity of 450 m/s in 15 seconds. What is its acceleration
Answer:
The answer is 30 m/s²Explanation:
The acceleration of an object given it's velocity and time taken can be found by using the formula
[tex]a = \frac{v}{t} \\ [/tex]
where
v is the velocity
t is the time
From the question
v = 450 m/s
t = 15 s
We have
[tex]a = \frac{450}{15} \\ [/tex]
We have the final answer as
30 m/s²Hope this helps you
A Parachutist with a camera, with descending at a speed of 12.5m/s, releases, the camera at an altitude of 64.3m. What is the magnitude of the velocity of the camera just before it hits the ground ? The acceleration of gravity is 9.8 m/s and air friction is negligible. How long does it take the camera to reach the ground
Given :
Initial velocity, u = 12.5 m/s.
Height of camera, h = 64.3 m.
Acceleration due to gravity, g = 9.8 m/s².
To Find :
How long does it take the camera to reach the ground.
Solution :
By equation of motion :
[tex]h = ut+\dfrac{gt^2}{2}[/tex]
Putting all given values, we get :
[tex]12.5t+\dfrac{9.8t^2}{2}=64.3\\\\4.9t^2+12.5t=64.3[/tex]
t = 2.56 and t = −5.116.
Since, time cannot be negative.
t = 2.56 s.
Therefore, time taken is 2.56 s.
Hence, this is the required solution.
is it good to have robots do surgery
Answer:
Using robotic surgery, surgeons can perform delicate and complex procedures that may have been difficult or impossible with other methods. Often, robotic surgery makes minimally invasive surgery possible. The benefits of minimally invasive surgery include: Fewer complications, such as surgical site infection.
Explanation:
mechanical advantage of a simple machine is 4,what does it mean?
Answer:
I hope this answer is correct
Explanation:
The mechanical advantage of a machine is 4. Mechanical advantage MA is the ratio of output (generated by the machine) force to input (applied to the machine) force. So MA = 4 means that for example if you apply 100 N then your machine will multiply that force and generate 400 N.
If an object is moving up, is it considered to have a positive or negative velocity?
Answer:
A positive velocity
Explanation:
Please help ASAP WILL GIVE BRAINLIEST
why is it important to use the correct number of significant digits when reporting the results of an experiment
A. So other scientist can see how spread out your data are
B. So other scientists can see how many separate trials you preformed
C. So other scientists can compare their experimental results with yours
D. So other scientistcan see how precise your measurements were
Answer:
D
Explanation: It makes the most sense. Plz mark brainliest
Answer:
D
Explanation:
So other scientist can see how precise your measurements are
A vertical rope is attached to an object that has a mass of 40.0 kg and is at rest.
The tension in the rope needed to give the object an upward speed of 3.50 m/s
in 0.700 s is
Answer:
239.2 N
Explanation:
Given that a vertical rope is attached to an object that has a mass of 40.0 kg and is at rest.The tension in the rope needed to give the object an upward speed of 3.50 m/s
in 0.700 s is
The tension in the rope and the weight of the mass will be acting in an opposite direction.
T - mg = ma ....... (1)
Where acceleration a = Velocity/ time
a = 3.5 / 0.7
a = 5 m/s^2
Substitutes acceleration a into the equation 1 above.
T - 40 × 9.8 = 40 × 5
T - 39.2 = 200
T = 200 + 39.2
T = 239.2N
Therefore, the tension in the rope needed to give the object an upward speed of 3.50 m/s
in 0.700 s is 239.2N
Answer:
The answer is T=592 N
Explanation:
Fw= 392N
a=v/t, so a=3.5ms^-1/0.7s
a=5ms^-2
Fnet=ma
T-Fw=ma
T-392N=40kg(5ms^-2)
T=592N
PLEASE HELP ME
A boulder is raised above the ground so that the gravitational potential energy relative to the ground is 310 J. Then it is dropped. What is its kinetic energy just before it hits the ground?
Answer:
try this
Explanation:
The energy of a falling object when it hits the ground is equaled to the energy it starts with because the potential energy is converted into kinetic energy entirely with the height at 0. This means the energy would be 200 J.
RESULT
A car starts from rest and accelerates uniformly over a time of 7.31 seconds for a distance of 160 m. Determine the acceleration of the car.
Answer:
Since it is given that car starts from rest so initial velocity
u
=
0 m/s
. The position of car is given, so
S
=
215 m
.
Explanation:
6346345
Answer:
215 m
Explanation:
Challenge: Write a Poem
Answer:
okkk soo...
Friendship is one of life's greatest treasures. Friends that are loyal are always there to make you laugh when you are down, they are not afraid to help you avoid mistakes and they look out for your best interest. This kind of friend can be hard to find, but they offer a friendship that will last a lifetime. Other friends may not be quite as loving. The pain caused by a friendship marred by betrayal is not easy to overcome. In fact, many poems find their inspiration from the joy brought about by a loving friendship or the pain caused by a failed friendship.
Explanation:
IDK MORE POINTS BUT SAY SOMTHING FUNNY
Not the place for this but yesterday I ate a clock, it was very time consuming.
What is brown and sticky
A STICK GET YOUR MIND OUT OF THE GUTTER
To get employees to work longer hours, employers often offer __________ in the form of extra pay.
A.
costs
B.
benefits
C.
incentives
D.
consequences
Answer:
C
Explanation:
I took the test
An object is moving east with a constant speed of 30 m/s for 5 seconds. What is the object's acceleration
Answer:
The answer is 6 m/s²Explanation:
The acceleration of an object given it's velocity and time taken can be found by using the formula
[tex]a = \frac{v}{t} \\ [/tex]
where
v is the velocity
t is the time
We have
[tex]a = \frac{30}{5} \\ [/tex]
We have the final answer as
6 m/s²Hope this helps you
4.) A boat heading north crosses a wide river at a velocity of 2.778 m/s. The river current pushes the boat east at a constant velocity of 1.389 m/s. Find the resultant velocity. a.) 3.11 m/s b.) 9.65 m/s c.) 0.78 m/s d.) 6.38 m/s
Answer:
Resultant velocity = 3.11 m/s.
Explanation:
It is given that,
The velocity of a boat is 2.778 m/s due North
The velocuity of river is 1.389 m/s due east.
We need to find the resultant velocity. The angle between these two velocities is 90 degrees. The resultant is given by :
[tex]v=\sqrt{v_b^2+v_r^2} \\\\v=\sqrt{2.778 ^2+1.389 ^2} \\\\v=3.11\ m/s[/tex]
So, the correct option is (a).
Plz I need help on my last question
Answer:
Dispalcement(s)=v*t
=8.1*6
=48.6m
On the Moon, astronauts can “bounce” from location to location, but on Earth they cannot move in this way. What physical property changes based on the gravitational force of a planet or moon?
Forensic Science-Glass
Glass fragments may adhere to __ or __ used in
a break-in.
Answer:
a
Explanation:
i had this question on edge its the first one
idk actually
If a substance has a density of 2.7g/cm3 and a mass of 86.4g, what is its volume?
Answer:
32cm³
Explanation:
Given parameters:
Density of substance = 2.7g/cm³
Mass of substance = 86.4g
Unknown:
Volume of substance = ?
Solution:
Density is the mass per unit volume of a substance.
Density = [tex]\frac{mass}{volume}[/tex]
Since the unknown is volume we solve for it;
mass = density x volume
86.4 = 2.7 x volume
volume = [tex]\frac{86.4}{2.7}[/tex] = 32cm³
Fill in the blanks to complete the statements.
A paper plane moving through the air experiences air _____ .
Frictional forces acting on an object are often converted into ______
energy, which causes the temperature of the object to rise slightly.
Answer:
Resistance and thermal
Explanation:
Edge 2020
A paper plane moving through the air experiences air resistance.
Frictional forces acting on an object are often converted into thermal energy, which causes the temperature of the object to rise slightly.
What is Frictional forces?Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
What is thermal energy?Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy.
To know more about Frictional forces here
https://brainly.com/question/14662717
#SPJ2
Michael tells Erica he weighs 104 pounds. Erica says she is 44 kilograms. If there are 2.2 pounds in a
kilogram, who is heavier?
Answer:
Michael is heavier.
Explanation:
If Michael is 104 pounds, that is equal to 47 kg.
Erica is 44 kg which is 97 pounds.
104 is greater than 97, and 47 is greater than 44.
Answer:
Michael weighs more
Explanation:
First, you need to convert either kilograms into pounds or pounds into kilograms. For this problem, I will convert kilograms into pounds.
Multiply 44kg by 2.2 pounds to find how many pounds are in 44 kg
44 x 2.2 = 96.8 pounds
Michael - 104 pounds
Erica - 96.8 pounds
Michael is heavier than Erica because he weighs 7.2 pounds more than her.
(pounds to kilograms - 104/2.2 = 47.3 kg Michael weighs 7.3 kilograms more than Erica)
You have about 10 quarts of blood in your body. At REST your heart pumps about 5 quarts each minutes. That is half of your blood volume per minute. During exercise it can pump 40 quarts per minute. How many times does all of your blood complete the cycle around your body during exercise?
Answer:
8 times
Explanation:
Given that You have about 10 quarts of blood in your body. At REST your heart pumps about 5 quarts each minutes.
That means the heart will pump 10 quarts in 2 minutes.
That is half of your blood volume per minute.
If during exercise it can pump 40 quarts per minute, that is, 80 quarts in 2 minutes.
To know how many times does all of your blood complete the cycle around your body during exercise, you must divide 80 quarts by 10 quarts. That is,
80 / 10 = 8
Therefore, your blood complete the cycle around your body 8 times during the exercise.
What is the mass of a car if 4500N of force is used to accelerate it at a rate of 3.0m/s?
Answer:
The answer is 15,000 kgExplanation:
The mass of the car can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{45000}{3} \\ [/tex]
We have the final answer as
15,000 kgHope this helps you