Answer:
Explanation:
Using the equation of motion
v = u+gt
v is the final velocity
u si the initial velocity
g is the acceleration due to gravity
t is the time
Substitute
0 = 4.5-(9.8)t
-4.5 = -9.8t
t = 4.5/9.8
t = 0.459s
What physical property of matter is always the same no matter the size or amount
Answer:
Characteristic Property
Explanation:
A property of matter that is always the same, no matter what size the sample. These are used to help identify substances. Examples are density, solubiility, flammability, reactivity
A box rest on the floor of an elevator. Because of static friction, a force is required to start the box sliding across the floor when the elevator is (a) stationary, (b) accelerating upwards, and (c) accelerating downward. Rank the force required in these three situations from smallest to largest
Answer:
The answer is c
Explanation:
If the elevator is moving upward gravity is pushing downward however once the elevator starts to descend gravity is pushing upward causing the box to move.
does using toothpast with baking soda make my teeth whiter than toothpaste without baking soda? What’s the Independent variable and what’s the dependent variable, and also constant.
Answer:
I dont think so dont try it!
Explanation:
True or False: You cannot have a high BMI reading and still be healthy.
Answer:
True
Explanation:
Im healthy and have a slightly higher BMI
Consider an amusement park ride in which participants are rotated about a vertical axis in a cylinder with vertical walls. Once the angular velocity reaches its full value, the floor drops away and friction between the walls and the riders prevents them from sliding down. How many revolutions does the cylinder make each second, given that the minimum coefficient of static friction that is needed to keep the riders from sliding down is 0.695 and the diameter of the cylinder is 13.5 m?
Answer:
0.231 rev/s
Explanation:
[tex]m[/tex] = Mass of cylinder
[tex]d[/tex] = Diameter of the cylinder = [tex]13.5\ \text{m}[/tex]
[tex]r[/tex] = Radius = [tex]\dfrac{13.5}{2}=6.75\ \text{m}[/tex]
[tex]\mu[/tex] = Coefficient of static friction = [tex]0.695[/tex]
[tex]N[/tex] = Normal force = [tex]mr\omega^2[/tex]
[tex]g[/tex] = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]
The force equation of the system will be
[tex]\mu N=mg\\\Rightarrow \mu\times mr\omega^2=mg\\\Rightarrow \omega=\sqrt{\dfrac{g}{\mu r}}\\\Rightarrow \omega=\sqrt{\dfrac{9.81}{0.695\times 6.75}}\\\Rightarrow \omega=1.45\ \text{rad/s}[/tex]
Converting to rev/s
[tex]\dfrac{1.45}{2\pi}=0.231\ \text{rev/s}[/tex]
The number of revolutions of the cylinder is 0.231 rev/s.
How do you calculate velocity?
a) Distance divided by time.
b) Displacement dided by time.
c) Speed multiplied by
time.
d) Displacement divided by velocity.
Answer:
A
Explanation:
Answer:
Distance divided by time
Explanation:
After accelerating for 20 seconds, a DeLorean sports car is a wide range of speeds that it can achieve, depending on traction. The distribution of speed follows in approximately normal distribution with the meaning of 80 mph and a standard deviation of 7.7 mph Marty wants the next acceleration run to be in the fastest 15% of all possible speeds how fast will the car have to go
Answer:
72mph
Explanation:
z = (x-μ)/σ, where x is the raw score, μ is the population mean, and σ is the population standard deviation.
z score for 15th percentile = -1.036
Mean = 80 mph
Standard deviation = 7.7mph
Hence,
-1.036 = x - 80/7.7
Cross Multiply
-1.036 × 7.7 = x - 80
- 7.9772 = x - 80
x = 80 - 7.9772
x = 72.0228mph
Approximately 72 mph
And object additionally addressed experience and acceleration of 9.8 m/s2 how much time will it take to achieve a velocity of 49 m/s
Answer:
YOU OR YOUR PARENTS VOTE BIDEN!TRUMP KILLED 223,000 PEOPLE AND HE STILL DOES NOT CARE! HE SAYS WE ARE ROUNDING THE CORNER. HE CAN NOT EVEN HAND OUT STIMULUS TO DYING BUISNESSES AND AIRLINES!
Explanation:
YOU OR YOUR PARENTS VOTE BIDEN!TRUMP KILLED 223,000 PEOPLE AND HE STILL DOES NOT CARE! HE SAYS WE ARE ROUNDING THE CORNER. HE CAN NOT EVEN HAND OUT STIMULUS TO DYING BUISNESSES AND AIRLINES!
An object with zero acceleration is not changing its velocity
An object that is moving can be in equilibrium.
O True
O False
Answer:
i think its false
Explanation:
A zero acceleration is the fundamental characteristic of an object in equilibrium.
Answer:
True
Explanation:
If its moving at a constant velocity its acceleration is zero. An zero acceleration is the the fundamental characteristic of an object in equilibrium
A ball is thrown upward with a speed of 30 m/s. Approximately how much time does it take the ball to travel from the release location (A) to its highest point (B)? Approximately how much total time is the ball in the air before it returns back to its original height (C)?
Answer:
The answer is below
Explanation:
Using the equation of newton law of motion for an object thrown vertially upwards:
v = u - gt
where u is the initial velocity, g = acceleration due to gravity and t is the time taken to reach maximum height.
Given that u = 30 m/s, at maximum height, v = 0, g = 10 m/s². Therefore:
0 == 30 - 10t
10t = 30
t = 30/10
t = 3 seconds
b) The time taken to reach the highest point = 3 seconds. Therefore the total time before it returns back to its original height = 2t = 2(3) = 6 seconds
A wagon with a weight of 300 N is accelerated across a level surface at 0.5 m/s2. What is the net force on the wagon?
Answer:
I believe it is 600.
Explanation:
300 divided by 0.5
(I am so sorry if this is wrong, I am currently learning the same thing.)
What’s the difference between front wheel, rear wheel, and 4 wheel drive?
Explanation:
front wheel uses power only in the front, rear uses it the back, and 4 wheel uses power in all the wheels
A truck travels down the highway at a speed of 100 km/hr. how long does the trip last if the truck covered 2200km?
Answer:
20 hours
Explanation:
if the truck travels 110 miles in one hours, 110 times 20 equals 2,200.
another way is- 2,200 divided by 110 = 20 hours.
Brennan is traveling in a car at a constant speed and in a constant direction. Once the brakes are applied , Brennan's upper body continues to move forward until a force in the opposite direction is applied on his body. Brennan's movement is an example of which scientific law? Group of answer choices Law of magnetism Law of Gravity Law of inertia Law of Conservation of Energy
Answer:
The answer is law of inertia
Explanation:
The law of inertia is the first law in Newton's laws of motion. It postulates that an object or body at a state of rest or in uniform motion continue in such state unless an external force is applied.
Brennan is a body, in a car that is moving at a constatnt speed. The moment an external force (brakes) is applied to the car's speed, Brennan's upper body which was at a state of rest starts moving forward.
Likewise, it takes the application of another force (acceleration) to restore Brennan's upper body back to the state it was before the car's breakes were applied.
Answer:
the person in front of me is correct
Explanation:
the speed and direction of an objects is it
Answer:
????
Explanation:
Between the orbits of Mars and Jupiter, several thousand small objects called asteroids move in nearly circular orbits around the Sun. Consider an asteroid that is spherically shaped with radius r and density 2000 kg/m^3.
1. You find yourself on the surface of this asteroid and throw a baseball at a speed of 24 m/s. If the baseball is to travel around the asteroid in a circular orbit, what is the largest radius asteroid on which you are capable of accomplishing this feat?
Answer:
The radius is [tex]r = 3.21*10^{4} \ m[/tex]
Explanation:
From the question we are told that
The density is [tex]\rho = 2000 \ kg/m^3[/tex]
The speed is [tex]v = 24 \ m/s[/tex]
Generally the largest radius of the asteroid is mathematically represented as
[tex]r = \frac{v^2}{ \sqrt{G * \rho * [\frac{4}{3} ] * \pi} }[/tex]
=> [tex]r = \frac{24^2}{ \sqrt{ 6.67*10^{-11} * 2000 * [\frac{4}{3} ] *3.142 } }[/tex]
=> [tex]r = 3.21*10^{4} \ m[/tex]
Electric charge only has an amount. That makes it a
a car moves around a wide turn going 45 mi/he the whole time. the car has constant _____.
Answer:
constant speed
Explanation:
this is because it does not increase nor decrease
A toy car rolls down a hill starting from rest. After 4.2 seconds its velocity is 18 meters per second. What is the acceleration of the car?
Answer:
I think it’s 24
Explanation:
what will most likely happen if a sound wave moves from the air through a solid
Answer:
The sound will become less noticeable, or deafen.
Explanation:
The circulatory system:
a. transports oxygen to the body's cells
b. absorbs oxygen from the lungs
c. carries oxygen in the bloodstream
d. all answers are correct
Energy from the sun is produced through atomic explosions on the surface of the sun. true or false
Answer:
false
Explanation:
The sun generates energy from a process called nuclear fusion. During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons. Hydrogen nuclei fuse to form one helium atom. During the fusion process, radiant energy is released.
should you keep your money in a savings account
Answer:
You should split your money wisely. Keep some in a savings and keep some in a checking account. Save for emergencies and rainy days.
Explanation:
describe how do ions form?
Answer:
Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by a combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms.
Explanation:
Answer:
Ion, any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations; negatively charged ions, anions. Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms. Examples of these processes include the reaction of a sodium atom with a chlorine atom to form a sodium cation and a chloride anion; the addition of a hydrogen cation to an ammonia molecule to form an ammonium cation; and the dissociation of a water molecule to form a hydrogen cation and a hydroxide anion.
Explanation:hope dis helps u
In terms of vectors why does an object slow down? (physics question)
A car weighing 12,000 N is parked on a 36° slope.
A) Find the force tending to cause the car to roll down the hill.
B) Find the acceleration of the car rolling down the hill.
Answer:
A resultant is the sum of two (or more) vectors.
2. To add vectors, place the vectors such that the tail of the second vector is placed
at the head of the first vector. Draw a resultant vector from the tail of the first
vector to the head of the second vector. Using the Pythagorean theorem,
calculate the magnitude of the resultant vector. Use geometry or a protractor to
determine the angle of direction of the resultant vector.
Explanation:
Matt manages a company that monitors the wastes from a company that produces radioactive byproducts. Matt is
most likely an)
O medical doctor.
O agricultural engineer.
O archeologist.
O nuclear scientist.
Describe how Kirschhoff's Circuit Laws relate to the law of conservation of energy
Answer:
Given that voltage is a measurement of energy per unit charge, Kirchhoff's loop rule is based on the law of conservation of energy, which states: the total energy gained per unit charge must equal the amount of energy lost per unit of charge.
Explanation:
PLEASE HELPPPP!!! I'VE BEEN STUCK ON THIS PROBLEM FOR A WHILE!!!!
A hiker walks due east for a distance of 25.5 km from her base camp. On the second day, she walks 41.0 km North Westtill she discovers the cave she wanted to see. Determine the magnitude and direction of her resultant displacement between the base camp and the cave.
Answer:
Resultant displacement is 29.2 km at north of west
Explanation:
To solve the problem, we have to use the rules of vector addition, resolving first each vector along the x- and y- direction.
Taking east as positive x direction and north as positive y- direction, we have:
- First displacement is 25.5 km east, therefore its components are
- Second displacement is 41.0 km northwest, so its components are
So, the components of the resultant displacement are
And so, the magnitude is calculated using Pythagorean's theorem:
And the direction is given by
Where the angle is measured from the west direction, since Rx is negative.
