Answer: -10.08 m/s
Explanation:
Here we only need to analyze the vertical problem.
When the ball is in the air, the only force acting on it will be the gravitational force, this means that the acceleration of the ball, is equal to the gravitational acceleration, then:
a(t) = -9.8m/s^2
Where the negative sign is because gravity pulls the ball down.
To get the velocity equation we need to integrate over time, we get:
v(t) = (-9.8m/s^2)*t + v0
Where v0 is the initial vertical velocity, here it is v0 = 10.5 m/s
Then the velocity equation is:
v(t) = (-9.8m/s^2)*t + 10.5 m/s
To get the position equation, we need to integrate again over time, we get:
p(t) = (1/2)*(-9.8m/s^2)*t^2 + (10.5 m/s)*t + p0
Where p0 is the initial position, we know that the ball is sent upward from the ground, so p0 = 0m
Then the position equation is:
p(t) = (1/2)*(-9.8m/s^2)*t^2 + (10.5 m/s)*t
Now we need to find the value of t such that the position is equal to zero (this means that the ball hits the ground again).
Then we need to solve:
p(t) = 0 = (1/2)*(-9.8m/s^2)*t^2 + (10.5 m/s)*t
If we divide both sides by t, we get:
0 = (1/2)*(-9.8m/s^2)*t + (10.5 m/s)
Now we can solve it:
(1/2)*(9.8m/s^2)*t = 10.5 m/s
t = (10.5 m/s)/((1/2)*(9.8m/s^2)) = 2.14 s
This means that after 2.14 seconds, the ball will hit the ground again.
The velocity of the ball when it hits the ground is equal to:
v(2.14s) = (-9.8m/s^2)*2.14s + 10.5 m/s = -10.08 m/s
The kinetic energy of an object is equal to one half Its mass multiplied by its
speed
A squared
B cubed
C to the fourth power
D to the fifth power
this is what I need help with
Answer: transverse wave
Explanation: the particles are moving up and down
PLEASE HELP ME WITH THIS ONE QUESTION
What is the final temperature when 625 grams of water at 75.0° C loses 7.96 x 10^4 J? (cwater = 4186 J/kg°C)
Answer: 44.57°C
Explanation:
The following can be deduced from the question:
Specific heat of water = 4.186 J/kg
From the question, we can infer that 625 × 4.186 joules of heat will be lost when there's a 1°C drop of water.
We then calculate the amount if degrees that it'll take to cool for 7.96 x 10⁴J. This will be:
= 7.96 × 10⁴ /(625 × 4.186)
= 79600/(625 x 4.186)
= 79600/2616.25
= 30.43°C
The final temperature will then be:
= 75.0°C - 30.43°C
= 44.57°C
A 2000 Kg car going 20 m/s crashes into a wall. What is the force of the car on the wall?
Answer:
40,000N
Explanation:
Force = Acceleration × Mass
2000×20=40,000
How does wavelength change depending on whether the pipe is open or closed?
Answer:
* in a tube with both ends open
λ = 2L / n n = 1, 2, 3,…
* tube with one end open and the other closed.
λ = 4L / n n = (2n ’+ 1 )
Explanation:
When a sound wave enters a pipe, a resonance process occurs, whereby only some wavelengths can occur.
* in a tube with both ends open
in this case there are maximums at each end, so if the length of the had is L
λ = 2L 1st harmonic
λ = 2 L / 2 2nd harmonic
λ = 2L / 3
λ = 2L / n n = 1, 2, 3,…
* In the case of a tube with one end open and the other closed.
At the open end there is a belly and at the closed end a node
λ = 4L 1st harmonic
λ = 4L / 3 3rd harmonic
λ = 4L / 5
λ = 4L / n n = 1, 3, 5,… odd
n = (2n ’+ 1 ) where n’ are all integers
Which of these types of EM radiation has the most energy?*
Radio waves
UV waves
Microwaves
O X-rays
A machine has an efficiency of 20%. Find the input work if the output work is 140J.
What is the speed of a Ball rolling South 50 meters in 2 seconds?
Answer:
25m/s
Explanation:
speed = distance/time = 50/2 = 25
what is resistance
Answer:
Resistance is the measure of the opposition to current flow in an electrical circuit
Resistance refers to the opposition or hindrance that a material or object offers to the flow of electric current. It is a fundamental concept in the field of electrical engineering and physics.
Resistance is measured in ohms (Ω) and is denoted by the symbol "R."
In electrical circuits, resistance is caused by various factors, including the type of material, its dimensions, and its temperature.
The primary element contributing to resistance is the collisions between electrons and atoms within the material through which the current is passing.
When an electric current flows through a conductor, such as a wire, the electrons move along the path of the conductor. However, as they do so, they encounter resistance.
This resistance causes the electrons to collide with atoms, which generates heat and dissipates energy.
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A form of energy NOT associated with the particles of objects is
thermal energy
mechanical energy
nuclear energy
chemical energy
Answer:
mechanical energy
Explanation:
because except mechanical energy all posseses particles
What do we call a collection of matter that does not interact with anything
else in the universe?
A. The forces that act in a collision
B. An intergalactic highway
C. An isolated system
D. A system in which collisions always occur
Answer: an isolated system
Explanation:
A geosynchronous satellite orbits Mars (mass = 6.42 x 1023 kg) once every Martian day, 88640 s. At what radius does it orbit?
Answer:
angular speed ω = 2PI / T rad/sec
ω^2*r = M*G/r^2
r = ³√ M*G/ω^2 = ³√6.42*10^23*6.67*10^-11*88640^2/39.5 = 2.04*10^7 m
Explanation:
A geosynchronous satellite orbits Mars once every Martian day, 88640 s then the radius of the orbit will be equal to 2.04 × 10⁷ m.
What is gravity?The fundamental force of attraction operating on all matter is recognized as gravity, also spelled gravity, in mechanics. It has no impact on identifying the interior properties of common matter because it is the weakest force known to exist in nature.
As per the given data in the question,
Mass, m = 6.42 x 10²³ kg
Time, T = 88640 s
Use the formula of velocity for satellite,
v = 2πR/T
Where R represents the radius
Use the formula of centripetal acceleration,
[tex]a_c[/tex] = v²/R
Thus;
[tex]a_c[/tex] = (2πR/T)²/R
= 4π²R/T²
The formula for gravitational acceleration is:
[tex]a_g[/tex] = Gm/R²
G = 6.674 × 10⁻¹¹ m³/kg. s²
Now, the satellite's gravitational acceleration is what is responsible for its centripetal acceleration. Thus,
Centripetal acceleration = gravitational acceleration.
Thus;
4π²R/T² = Gm/R²
Making R the subject gives;
R = ∛(GmT²/4π²)
Substitute the values in the above equation,
R = ∛((6.674 × 10⁻¹¹ × 6.42 x 10²³ × 88640²)/(4 × π²))
R = 2.04 × 10⁷ m
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What is the mass of a 5kg object on the Moon?
The mass of a 5kg object is 5kg. Makes no difference where it happens to be located.
Answer:
The mass of a 5kg object is 5kg
Explanation:
Have a great day
A deer is walking at 2.27speeds up to 13.42 m/s, covering a distance of 53.2 meters during this acceleration. How much time did it take him to do this.
Answer:
t=3.964s
Explanation:
Use t=d/s
t=53.2m/13.42m/s= 3.964s
What is the wavelength of a wave?
a tire rolls from rest to an angular velocity of 6 radians per second. the angle it turns through is 12 radians. what is the angular acceleration of the tire?
Answer:
[tex]\alpha =1.5\ rad/s^2[/tex]
Explanation:
Given that,
Initial angular velocity, [tex]\omega_i=0[/tex]
Final angular speed, [tex]\omega_f=6\ rad/s[/tex]
Angular displacement, [tex]\theta=12\ rad[/tex]
We need to find the angular acceleration of the tire. We can find it using the third equation of rotational kinematics. So,
[tex]\omega_f^2-\omega_i^2=2\alpha \theta\\\\\alpha =\dfrac{\omega_f^2-\omega_i^2}{2\theta}\\\\\alpha =\dfrac{6^2-0^2}{2\times 12}\\\\\alpha =1.5\ rad/s^2[/tex]
So, the angular acceleration of the tire is equal to [tex]1.5\ rad/s^2[/tex].
A gazelle is running at 17.46 m/s. He sees a lion and accelerates at -1.49 m/s/s,
How fast is he running 2.39 seconds later?
Answer:
V=21.0211m/s
Explanation:
Use V=vi+at
So, V=17.46m/s+(1.49m/[tex]s^{2}[/tex])(2.39s)= 21.0211m/s
Antonym for Radiation lol
Answer:
convergence is the correct answer
Answer:
absorption, concealment, containment, refrain, repression, suppression, withholding, confinement, restriction, constraint
wait no....
diffusion, emission, polarization, spread, ramification, divarication, propagation, transmission, broadcast, circulation and dissipation.
LOL
True Or False for each question
7 true
8 false
9 false
10 false
11 false
12 true
13 true
hope this helps!
Emma draws another diagram showing how adding energy affects this wave. How does her new diagram compare to this diagram?
A
Her diagram shows higher wavelengths.
B
Her diagram shows lower wave amplitudes.
С
Her diagram shows lower wave frequencies.
D
Her diagram shows higher wave amplitudes.
HELPPPP MEEE PLEASEEEE 55 POINTS!!!
What is the period of the wave motion for a wave with a frequency of 0.68 kHz?
____s
Answer:
T = 1.47 ms
Explanation:
We need to find the period of the wave motion for a wave of frequency 0.68 kHz.
Let the period be T. We know that,
T = 1/f
So,
[tex]T=\dfrac{1}{0.68\times 10^3}\\\\T=1.47\times 10^{-3}\ s\\\\T=1.47\ ms[/tex]
So, the period of the wave motion is 1.47 ms.
Will give brainliest
Magnesium in group 2 has an oxidation number of +2. Which group would it easily react with?
Group 13
Group 1
Group 18
Group 16
Answer:
I think 18 not entirely sure though
Explanation:
Group 18 are the noble group so 16 + 2 = 18
1. A particle is projected with a speed of 25 ms-'at
30° above the horizontal. Find: (a) the time
taken to reach the highest point of the trajectory ,
Answer:
1.25 s
Explanation:
From the question given above, the following data were obtained:
Initial velocity (u) = 25 m/s
Angle of projection (θ) = 30°
Acceleration due to gravity (g) = 10 m/s²
Time (t) to reach highest point =?
The time taken for the particle to reach the highest point can be obtained as follow:
t = uSineθ / g
t = 25 × Sine 30 / 10
t = 25 × 0.5 / 10
t = 12.5 / 10
t = 1.25 s
Thus, it will take the particle 1.25 s to reach the highest point.
A locomotive is pulling 19 freight cars, each of which is loaded with the same amount of weight. The mass of each freight car (with its load) is 37,000 kg. If the train is accelerating at on a level track, what is the tension in the coupling between the second and third cars? (The car nearest the locomotive is counted as the first car, and friction is negligible.)
Explanation:
The tension between cars 2 and 3 accelerates cars 3 through 17. That is a total of 15 cars.F = M*a, with M = 15*37,000 = 555*10^3 kga = 0.7 m/s^2Solve for F, in Newtons
Calculate the current flowing if a charge of 36 kilocoulombs flows in 1 hour.
Answer:
sorry I didn't get it, my apologies
If Manuel exerts a force of 10 N to push a desk to the right at the same time Lynn exerts a force of 15 N to push the desk to the left, the desk will move to the
left
right
sideways
it won't move
Answer:
The desk will move to the left.
Explanation:
Since Manuel is exerting a force of 10 N to the right, and Lynn is exerting a force of 15 N to the left, it means that Lynn is exerting a force of 5 N more than Manuel, meaning that the desk will move to the left, the direction Lynn is pushing it too.
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Hope it helps!
the long-term average weather for a region is called
Answer:
Climate.
Explanation:
Weather can be defined as the atmospheric conditions of a particular area over a short period of time.
The elements of weather include precipitation, wind, temperature, atmospheric pressure, relative humidity, cloud, and wind speed.
The long-term average weather for a region is called climate.
This ultimately implies that, when the average atmospheric conditions prevailing in a specific region persists for a very long period of time, it is known as climate.
What is the angular displacement In radians of a wagon that moves 270 around a circle path
Answer:
dont go to link they will track u
Explanation:
What is the net force on a race car with a mass of 1200 kg if its acceleration is 32.0m/s2 West?
Answer:
38400N
Explanation:
F=mass×acceleration
=1200×32
=38400
explain Heat with its unit
Answer:
As a form of energy, heat has the unit joule (J) in the International System of Units (SI). However, in many applied fields in engineering the British thermal unit (BTU) and the calorie are often used. The standard unit for the rate of heat transferred is the watt (W), defined as one joule per second
Explanation:
Hope it helps