Answer:
If the fired bullet leaves the gun muzzle parallel to the ground (no vertical y velocity), then it will only have horizontal (x direction) velocity, and the downward force of gravity will be the only vertical y force on the bullet. Hence the time it takes to strike the ground is the same as that of a dropped bullet.
Explanation:
A student throws a ball horizontally at the rate of 40 m/s. If the height from which the ball is thrown is 2 m, how far will the ball travel before it touches the ground?
a-16.33m
b-19.54m
c-25.56m
d-28.29m
Answer:
The correct option is C
Explanation:
From the question we are told that
The speed of the ball in the horizontal direction is [tex]v = 40 m/s[/tex]
The height from which the ball is thrown is s = 2 m
Generally from kinematic equation
[tex]s = ut + \frac{1}{2} gt^2[/tex]
Here u is the initial velocity of the ball and this zero given that the ball was at rest before it was thrown.
So
[tex]2 = 0 * t + \frac{1}{2} 9.8t^2[/tex]
=> [tex]t = 0.6889 \ s[/tex]
Generally the distance the ball will travel before touching the ground is
[tex]d = v * t[/tex]
=> [tex]d = 40 * 0.6389[/tex]
=> [tex]d = 25.56 \ m[/tex]
Object’s motion + unbalanced force =
_____ velocity.
Answer:
constant velocity
Johnny kicked a football from a hill 20 meters tall. The ball leaves at a 45.0 degree angle with an initial velocity of 30.0 m/second. How many seconds was the ball in the air? Report your answer to 3 sig figs. Seconds
Answer:
The value is [tex]t = 5.124 \ s[/tex]
Explanation:
From the question we are told that
The height of the tree is [tex]s = 20 \ m[/tex]
The angle the ball leaves is [tex]\theta = 45^o[/tex]
The initial velocity is [tex]u = 30.0 \ m/s[/tex]
Generally the vertical of the ball's initial velocity is mathematically evaluated as
[tex]u_y = u * sin (45)[/tex]
=> [tex]u_y =- 30 * sin (45)[/tex]
=> [tex]u_y = -21.21 \ m/s[/tex]
Here [tex]u_y[/tex] is negative because it is in the direction of the negative y-axis
Generally from kinematic equation we have
[tex]s = u_yt + \frac{1}{2} g t^2[/tex]
=> [tex]20= -21.21 t +4.9 t^2[/tex]
=> [tex]4.9 t^2 -21.21 t- 20= 0[/tex]
Solving using quadratic formula we have that
[tex]t = 5.124 \ s[/tex]
9. AM 630 is a station where you can listen to sports. The frequency is 630 khz (or
630,000 hz). What is the wavelength?
Help
Answer:
475861.044 is the wavelength
Explanation:
wavelength= speed/frequency
speed of light equals 299,792,458
and the frqeuncy equals 630
so 299,792,458/630=475861.044 equals the wavelength
The wavelength of the waves is equal to 476.2 m
What are frequency and wavelength?The frequency of a wave can be described as the number of oscillations in one second. The frequency has S.I. units represented as per second or hertz.
Wavelength is the distance between the two adjacent points in phase with each other. Two adjacent crests or troughs are separated by a distance of a single wavelength.
The relationship between frequency, speed of the wave, and wavelength are:
c = νλ
Given, the frequency of the wave, ν = 630 kHz = 630 ×10³ s⁻¹
Then the speed of all electromagnetic waves including radio waves is equal to the speed of light, c = 3 ×10¹⁰ m/sc
The wavelength of the waves can be determined from the relationship:
λ = c/ν = 3× 10⁸/ 630 ×10³
λ = 476.2 m
Therefore, the wavelength of the wave is 476.2 m.
Learn more about wavelength and frequency, here:
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A 1.5 kg rightward moving air glider decreases its speed from 1.872 meters per second to 1.798 meters per second over the length of 1 M long track. Determine the net force acting upon the air glider
Answer:
The magnitude of the net force is 0.204 N.
Explanation:
The net force acting upon the air glider is:
[tex] F = ma [/tex]
Where:
m: is the mass of the air glider = 1.5 kg
a: is the acceleration
First, we need to find the acceleration. Since we have the initial and final speed we can calculate the acceleration as follows:
[tex] v_{f}^{2} = v_{0}^{2} + 2ad [/tex]
Where:
[tex]v_{f}[/tex]: is the final speed = 1.798 m/s
[tex]v_{0}[/tex]: is the initial speed = 1.872 m/s
d: is the distance = 1 m
The acceleration is:
[tex] a = \frac{v_{f}^{2} - v_{0}^{2}}{2d} = \frac{(1.798 m/s)^{2} - (1.872)^{2}}{2d} = -0.136 m/s^{2} [/tex]
The minus sing is because the air glider is desaccelerating.
Now, the magnitude of the net force is:
[tex] |F| = ma = 1.5 kg*0.136 m/s^{2} = 0.204 N [/tex]
Therefore, the magnitude of the net force is 0.204 N.
I hope it helps you!
oiii any tamil people put me a hai
huh I dont understand your question.
Which was first launched during the Space Race? rover satellite space shuttle space station hurry i will mark brainliest for first to answer you have 2 min.
Answer:
A satellite.
Explanation:
I got this answer right.
The satellite was the first launched craft during the Space Race. The correct answer would be an option (B)
What was the space race?The space race was a series of technological tests between the United States and the Soviet Union in order to demonstrate dominance in spaceflight. According to an online exhibit from the National Air and Space Museum, it was an offshoot of the mid-twentieth-century Cold War, a violent worldwide war that pitted the philosophies of capitalism and communism against one another (opens in new tab).
The first goal of this "space race" was to launch an unmanned object, a satellite, into orbit around the Earth.
A satellite is an instrument that has been sent into orbit to collect data or to serve as part of a communication system.
Thus, the correct answer would be option (B) satellite was the first launched craft during the Space Race.
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Friction force is the opposition to the motion of surfaces sliding across each other. Based on your observations, what is one factor that affects the amount of friction?
One factor that affects the amount of friction is roughness or smoothness of the sliding object.
Factors affecting friction
There are several factors affecting the amount of friction and they include the following;
Roughness or smoothness of the sliding object.Roughness or smoothness of the surface.Shape of the object.Normal force acting upon the sliding bodies.Dry friction is independent of the surface area of a contact.Thus, one factor that affects the amount of friction is roughness or smoothness of the sliding object.
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Answer: It depends on the surface is the surface bumpy? Or is the surface flat and smooth?
Explanation: If a surface is to bumpy friction slows it down, if a surface is flat and smooth it glides with ease.
People have vastly different opinions on the role and responsibility of schools to provide sex education. Teenage pregnancy and sexually transmitted diseases are real problems facing our adolescent population. In some cases, the decision to engage in a sexual relationship is a life or death decision.
References:
Coon, D., Mitterer, J.O., & Martini, T. (2019). Introduction to psychology: Gateways to mind and behavior (15th ed.). Belmont, CA: Cengage Learning.
Answer: ummm is this a question?
Explanation: what I said up there ^
Air pressure decreases as elevation increases. Describe how the boiling point of
water on top of a mountain would be different from its boiling point at sea level.
Answer:
The boiling point on top of a mountain would be lower than at sea level because the altitude would be higher and air pressure would decrease.
As the height increases, because most of the air molecules are held near to the surface and hence pressure by gaseous substance will be lower at higher altitudes results in lowering boiling point also.
What is boiling point?Boiling point of a substance is the temperature at which the substance changes from the liquid state to vapor state where both phases are in equilibrium and the pressure of vapor phase above the liquid phase will be equal to the atmospheric pressure.
The boiling point is dependent on the bond type, molecular weight, temperature and pressure. At higher altitudes, the pressure will be reduced due to the less denser air.
The volume of gas molecules is higher on elevation and thus, a decreased pressure causes, the water molecules easily boil with weekend intermolecular force thus, boiling point at mountain will be less than that at sea level.
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sound travels slowest through what temperature of water?
a. 20
b. 40
c. 60
d. 80
20 degrees.
Sound travels faster when the medium (something to travel through) is less dense.
For example, Air is less dense than water, water is less dense than a solid.
In this case, since we are working with water, the colder the temperature of water, the denser it is. Likewise, the hotter the temperature of water, it gets less denser.
If this helped, please mark branliest.
The sound travels slowest through 20 degree temperature of water. The correct option is a.
What is sound wave?A sound wave is a result of compression and rarefaction, by which sound is propagated in a material medium such as air.
Sound travels faster when the medium is less dense. In case of air, which is less dense than water.
When the temperature is increased, the object becomes less dense than previous state of the object. The sound wave travels faster in rarer medium than the denser medium.
So, sound travels slowest through 20 degree temperature of water.
Thus, the correct option is a.
Learn more about sound wave.
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A student throws a ball horizontally at the rate of 40 m/s. If the height from which the ball is thrown is 2 m, how far will the ball travel before it touches the ground? 16.33 m 16.33 m 25.56 m 25.56 m 28.29 m 28.29 m 19.54 m
Answer:
25.56 m
Explanation:
For vertical movement , initial velocity u = 0
Displacement h = 2 m
time taken = t
h = ut + 1/2 gt²
2 = .5 x 9.8 x t²
t² = .4081
t = .639 s
During this period , the ball will move in horizontal direction uniformly with velocity 40 m /s .
horizontal displacement = horizontal velocity x time
= 40 x .639 = 25.56 m
A satellite is orbiting Earth with a speed of 8,000 m/s. How far is the satellite from Earth’s center?
Answer:
8 million miles
Explanation:
believe me
Un uber va por una persona y se mueve 800 m al este, se detiene porque se da cuenta que se pasó 300 m, así que se devuelve. Pero al llamar al cliente, este le dice que camino 100 m al este. El desplazamiento total del uber para recoger a la persona es de:
Responder:
100m
Explicación:
Dirección total de la persona de recogida hacia el este = 300 m + 100 m (ya que caminó 100 m hacia el este cuando el conductor lo llamó)
Dirección total de la persona de recogida a través del este = 400 m
Para el súper conductor, fue 800 m hacia el este y regresa por (800-300) m cuando vio que había pasado a la persona de recogida por 300 m. El desplazamiento total del uber es 800-300 = 500 m
El desplazamiento total del uber a la persona que recoge es la diferencia en su desplazamiento, es decir, 500-400 = 100 m.
What would happen if your body id exposed to the vaccum of space?
Answer:
Acute exposure to the vacuum of space: No, you won't freeze (or explode) ... Upon sudden decompression in vacuum, expansion of air in a person's lungs is likely to cause lung rupture and death unless that air is immediately exhaled.
Explanation:
why are there no earthquake on the country ies you mentioned
Answer:
I’m not sure bro
Explanation:
Answer:
The whole country is in a very seismic area,and they have the densest seismic network in the world, so they are able to record many earthquakes. The spares seismic instrumentation in those areas doesn't allow us to actually record all the smaller earthquakes.
someone help please-
Answer:
Explanation:
light gets energy from the battery,
battery gets energy from the generator
flywheel gets energy from the crank
The area under which of
these graphs can be used
to estimate the value of
impulse?
Graph A
O Graph B
O Graph C
Graph D
Answer:
Graph A is the Answer
which molecule has the longest bond length nitrogen, hydrogen or oxygen
Answer:
Hydrogen
Explanation: hopefully.
A runner begins running from rest (0 m/s) with an acceleration of 2 m/s? What is the
speed of the runner 5 seconds later?
Answer:
10
Explanation:
U=0
V=?
a=2
times=5
a=(v-u)÷t
2=(x-0)÷5
10=x-0
10ms^-1=x
Answer:
10 m/s
Explanation:
Multiply 2 m/s by 5.
1 second: 2 m/s
2 seconds: 4 m/s
3 seconds: 6 m/s
4 seconds: 8 m/s
5 seconds: 10 m/s
This can also be solved by y=mx+b, where y is speed, m is the m/s, so 2, x is time, we want to find what y equals when x=5, and b is starting speed, which is 0 m/s, since the runner is starting from a rest.
In short, this is:
x=5
y=2x
y=2(5)
y=10
which is an example of a transverse wave?
A. an ultrasound that transmits sound waves
B. crowd doing the wave at a sporting event
C. the waves formed by an earthquake
D. the movement of a spring in a pogo stick
Answer:
b
Explanation:
it is
An example of a transverse wave is; Choice D; the movement of a spring in a pogo stick
What is a transverse wave?A transverse wave is a wave whose oscillations are perpendicular (at right-angle) to the direction of the wave's advance.
This is in contrast to a longitudinal waves in which case the medium travels in the direction of its oscillationsString waves are an example of transverse waves because the string moves up and down at right angles to the horizontal motion of the wave.
Read more on transverse waves;
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A student athlete is participating in the hammer throw. The student rotates in uniform circular motion with the mass rotating 2.3 m away from the center of rotation.
Refer to the information and diagram shown above. The student athlete can rotate so that the object is moving with a speed of 10 m/s.
What is the acceleration necessary to keep the object in uniform circular motion?
The acceleration necessary to keep the object in uniform circular motion is 43.48 m/s²
From the question given above, the following data were obtained:
Radius (r) = 2.3 mVelocity (v) = 10 m/sAcceleration (a) =?The acceleration required to keep the object in circula motion can be obtained as follow:
a = v² / r
a = 10² / 2.3
a = 100 / 2.3
a = 43.48 m/s²
Thus, the acceleration required to keep the object in circula motion is 43.48 m/s².
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A 60-kg person walks from the ground to the roof of a 74.8 m tall building. How much gravitational potential energy does she have at the top of the building?
Given :
Mass of person, m = 60 kg.
Height of roof of building, h = 74.8 m .
To Find :
How much gravitational potential energy does she have at the top of the building.
Solution :
We know, gravitational potential energy is given by :
[tex]P.E = mgh[/tex]
Here, g = acceleration due to gravity = 9.8 m/s².
P.E = 60×9.8×74.8 J
P.E = 43982.4 J
P.E = 44 kJ
Hence, this is the required solution.
In one of the printed docunent the unit of universal gravitational constant is given Nm2kg-2.Check its correctness for dimension analysis.
Answer:
It is correct
Explanation:
N is a unit of force
m for distance
and kg for mass
dimension of force is MLT-2
dimension of distance is L
dimension of mass is M
then. Nm2kg-2 must be equal to [MLT-2][L2][M-2]
or, Nm2kg-2 = [M-1 L3 T-2]. --------1
force (F) = G (m1 x m2)/d2
or G = Fd2/(m1m2)
G = (MLT-2 . L2)/M-2
= M-1L3T-2. -----------2
EQN 1 = EQN 2
so given unit is correct
A plastic bottle lies sideways on the floor of a stationary bus. The bus driver starts the bus and moves forward. At a stop light, the bus comes to a sudden stop. According to Newton's laws of motion, which scenario correctly describes how the bottle will move?
Answer:
Explanation:
Initially, the plastic bottle lies sideways on the floor of a stationary bus, so the bottle is also in the stationary state.
When the bus starts moving, the bottle will try to maintain its state of rest as described by Newton's first law, due to which the bottle will slide in the backward direction and at the same time there is frictional force acting on the bottle in the forward direction by the bus floor due to which the speed of bottle starts increasing in the direction of the bus as described by Newton's second law.
After some time, the bus, as well as the bottle will move at the same constant speed as there is an application of frictional force.
On the sudden application of the break, the bus will reach the stationary position, but in order to maintain the inertia, the bottle will slide forward on the bus floor due to the inertia of the bottle as described by Newton's first law and at the same time there is frictional force acting on the bottle in the backward direction by the bus floor due to which the speed of bottle starts decreasing as described by Newton's second law.
If the hydrogen peroxide is heated to 60°C first, the catalase doesn't
work. why?
Answer:
The ideal temperature of catalase activity is 66.6 degrees Celsius, so a temperature between 60 degrees and 70 degrees should most likely release the most oxygen during the reaction.
Explanation:
Start
Finish
8 min
Time
0 min
1 min
2 min
3 min
4 min
5 min
6 min
7 min
Temperature
90°C
83°C
78°C
73°C
68°C
64°C
60°C
57°C
54°C
O 45 degrees celsius/min
O 450 degrees celsius/min
O 4.5 degrees celsius/ min
O 0.45 celsius/min
hos
what is the formula of presure
Answer:
P=F/A
Explanation:
P. Is pressure
F is force
A is area
A mountaineer jumps off a ledge (with a height of 5m) to cross a crevasse with a
gap of 2m. What was the mountaineer's horizontal velocity to clear the gap? (use g=10m/s/s) (answers are in m/s) *
1
2
4
8
Answer: the correct answer is 8 please let me know if I’m wrong
Explanation:
5. An airplane must reach a velocity of 71 m/s for takeoff. If the runway is 1.0 km long, what
must the constant acceleration be?
Answer:
final velocity 'v' = 71m/s distance 's' = 1000m intial velocity 'u' =0 therefore,using third equation of motion v^2- u^2=2*a*s 71*71=2*a*1000 a=71*71/(2*1000 a= 2.52m/s^2
Explanation: