In the early 1900s, Robert Goddard proposed sending a rocket to the moon. Critics took the position that in a vacuum such as exists between Earth and the moon, the gases emitted by the rocket would have nothing to push against to propel the rocket. To settle the debate, Goddard placed a gun in a vacuum and fired a blank cartridge from it. (A blank cartridge fires only the hot gases of the burning gunpowder.) What happened when the gun was fired
The law of conservation of momentum allows to find the result for the movement of the system when the gun is fired is:
The gun acquires a velocity in the opposite direction to the bullet. The speed of the gun is less than the speed of the bullet.
The conservation of momentum is one of the most important principles of physics, it establishes that in an isolating system the momentum is conserved.
Let's define the system to be formed by the gun and the bullet, this system is isolated, therefore the momentum is conserved, let's write the moment for two instants, see attached. The mass of the gun is M and the mass of the bullet is m
Initial instant. Before the shot.
p₀ = 0
Final moment. After the shot.
[tex]p_f = (M-m) \ v_{gun} + m \ v_{bullet}[/tex]
The momentum is preserved.
p₀ = [tex]p_f[/tex]
[tex]0 = (M-m) \ v_{gun} + m \ v_{bullet}[/tex]
[tex]v_{gun} = - \frac{m}{M-m} \ v_{bullet}[/tex]
Consequently we can see that the gun goes back, its velocity is negative with respect to the bullets and the velocity of the gun is much lower than the velocity of the bullet, to increase this velocity we can:
Increase the speed of the bullets. Increase the mass of the ejected bullet, for the mass of the pistol to be smaller.
In conclusion, using the law of conservation of momentum we can find the result for the movement of the system when the gun is fired is:
The gun acquires a velocity in the opposite direction to the bullet. The speed of the gun is less than the speed of the bullet.
Learn more about conservation of the momentum here: brainly.com/question/2141713
A 600 kg elevator initially moving upward undergoes motion represented by the
velocity vs time graph shown. Calculate the force of tension supporting the
elevator. (Enter your answer as four significant figures without units or spaces.
Ex) If the force=1598.3 N enter "1598") *
velocity
(m/s)
7
6
ET
5
4
3
2
1
time
(5)
0
1
2
3
4
5
6
7
The force of tension supporting the elevator is 400.0 N
To find the force of tension supporting the elevator, we need to find the acceleration of the elevator from the gradient of the graph.
So, a = Δv/Δt = (v₂ - v₁)/(t₂ - t₁) where v₁ = 2 m/s, t₁ = 0 s, v₂ = 6 m/s and t₂ = 6 s
So, a = (6 m/s - 2 m/s)/(6 s - 0 s)
a = 4 m/s ÷ 6 s
a = 2/3 m/s²
a = 0.67 m/s²
So, the force of tension on the elevator, T = ma where m = mass of elevator = 600 kg and a = acceleration of elevator = 2/3 m/s².
So, T = ma
T = 600 kg × 2/3 m/s²
T = 400 N
So, the force of tension supporting the elevator is 400.0 N
Learn more about tension here:
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The photo shows a skateboarder pushing her foot against the ground as she rides down a hill. How does this action cause the skateboarder's speed to change?
OFFERING BRAINLIEST PLS RESPOND ASAP
science
Answer:
it increases the net force pointing down the hill, so she speeds up
Explanation:
Science 6.4.2
A ball with a mass of 5 kg is located at a height of 10 m. What is the potential energy of the ball?
Answer: 14.14m/s
Explanation: mark me brainly
what is the dissolving substance in a solution? A.)particles B.)solute C.)solvent D.)water
Answer:
b.Solute
Explanation:
The substance being dissolved is called the solute and the liquid doing the dissolving is called the solvent. In order for a substance to dissolve, the molecules of the solute need to interact with the molecules of the solvent.
A bumper car with a mass of 86 kg is traveling at 3.6
m/s. A bumper car with a mass of 98 kg is traveling at
1.6 m/s in the opposite direction. After the collision, the
86 kg bumper car travels at -0.5 m/s. What is the speed
of the 98 kg bumper car after the collision?
Answer:
2.0 m/s
Explanation:
i found it on quizlet
An airplane flying at a velocity of 610 m/s lands and comes to a complete stop over a 53 second
period of time.
a. Did this airplane speed up or slow down?
Answer:
The plane slowed down
Explanation:
To come to a complete stop you must slow down until you stop...
Also the airplane has an acceleration of -11.5 m/s if you need that.
Around age 60, Alex's lens entirely lost its capacity to adjust to objects at varying distances. Alex has a condition called
There are various conditions usually associated with the eyes. Most are eye defects and this include, glaucoma, presbyopia, myopia, hypermetropia and the likes.
Around age 60, Alex's lens entirely lost its capacity to adjust to objects at varying distances developing the presbyopia condition.
Presbyopia is a genetic condition that affects the eye. It is also an age-related condition. In this case, the eye lens cannot change its shape easily as compared to when young. It occurs when the eye lose its ability to focus on objects at various distance producing blurry images.Learn more about presbyopia: https://brainly.com/question/24303969
I'm very confused. Thanks for whoever helps me :)
how did ww1 help contribute to the great depression
The depression was caused by a number of serious weaknesses in the economy. ... The lingering effects of World War I (1914-1918) caused economic problems in many countries, as Europe struggled to pay war debts and reparations. These problems contributed to the crisis that began the Great Depression. hope AND I HOPE it helps
There are normally two types of common cables in your home. Explain why the cables have 2 or 3
wires inside. Why is there not only one?
Answer:
it's because every wire is different and the insides of it are possitive and negative
Explanation:
hope my answer is correct
Questions:
1. Which color spectrum has the longest wavelength?
2. Which color spectrum has the shortest wavelength?
3. In a prism, which color is least bent?
4. Which color is most bent?
5. How do you relate the arrangement of colors of the visible light spectrum to its
wavelength?
#1
Red has the largest wavelength.(750nm)
#2
Blue has the shortest wavelength (400nm)
#3
Red color is least bent.
#4
Violet color is most bent
#5
Attachment attached
EASY 35 POINTSSSSS PLSSSSSSSS
i just need notes on food weds so what ever u find just put on the answer
Answer:
the predator or tertiary consumer is not eaten except by saprophytes and maybe vultures, feeding starts from the green plants or producers going through a complex energy transfer
Can you answer it for me pls
Answer:
the answer is b. because liquid always bubble when boiling
What is the force acting on a 0.5 Kg object moving at a rate of 100 m/s2?
Answer:
50 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question
mass = 0.5 kg
acceleration = 100 m/s²
We have
force = 0.5 × 100 = 50
We have the final answer as
50 NHope this helps you
The state in which the inside of each heart cell is negatively charged and the outside is positively charged is:
Answer:
Resting state
Explanation:
please answer quick, i’ll give brainliest!
Answer:
3 seconds
Explanation:
30/10=3
A weightlifter raises a 180-kg barbell to a height of 1.95 m. How much work is done by the weightlifter in lifting the barbells
P= 10m = 10 x 180 = 1800 N
work is done by the weightlifter in lifting the barbells :
A= Ph = 1800 x 1.95 = 3510 J
ok done. Thank to me :>
where is an electron located within an atom
Answer: in the cloud around the nucleus.
Explanation:
got it right
what color of light does a low-pressure sodium street lamp give off?
Answer:
Yellow Light
Explanation:
Low-pressure sodium lamps gives of a yellow/orange light/glow. Which can also be said as monochromatic yellow light. Because they only produce a single wavelength of yellow light, which results in a less intense light output.
Hopefully this is right! :D good luck
Which costs more? Using a 1.5kW microwave for 10 minutes or a 30W CD player for 3 hours?
Microwave Cost More
____________
= 1,5 kW
= 1.500 Watt × 10/60
= 15.000 ÷ 60
= 250 Watt
= 30 Watt × 3
= 90 Watt
Microwave Using 250 Watt For 10 Minutes
CD Player Using 90 Watt For 3 Hours
Microwave ≥ CD PlayerCar A, traveling north at 46 mi/hr, is passed by Car Bwhich is traveling north at 56 mi / h * r . A passenger riding in Car B would measure the velocity of Car A in mi / h * r ) to b
Answer: - 10 mph
Explanation: The car B passenger would see a car going backwards from his/her position, by the speed difference: (46-56) = -10 mph.
What is the average speed of an object that travels 6 meters in 2 seconds and then travels 3 meters in 1 second?
Answer:
3 m/s
Explanation:
Average Speed = [tex]\frac{Total Distance}{Total time}[/tex]
Plug in the numbers, it will be (6m + 3m) divided by (2s + 1s), which is 9m/3s, which equals to 3m/s.
a car is moving at a constant speed of 100 miles per hour for 2 hour. how far does the car travel?
a. 200 miles
b. 100 miles
c. 2 miles
d. 50 miles
Answer: a) 200 miles because your doing 2 hours and each hours is 100 miles :)
what is the relationship between frequency and pitch?
Each organ system in the human body operates independently and does not rely on any others to support it.
O True
O False
Answer:
False
Explanation:
All organs rely on one another.:)
the heat of combustion of ethane, c2h6, is 1560 kj/mol. what is the heat of combustion of ethane, in kj per gram?
Answer: 52 kj/gm
Explanation:
the heat of combustion of ethane, c2h6, is 1560 kj/mol. what is the heat of combustion of ethane, in kj per gram?
ethane is C2H6 and has a molecular mass of (2X12) + (6X1) = 30m
1 mole of ethane = 30 gmsso
1560 kj/moe = 1560 kj/30gm =
52 kj/gm
A star with a mass like the Sun which will soon die is observed to be surrounded by a large amount of dust and gas -- all material it has expelled in the late stages of its life. If astronomers want to observe the radiation from such a giant star surrounded by its own debris, which of the following bands of the spectrum would be the best to use to observe it?
a. gamma-rays
b. x-rays
c. ultraviolet
d. infrared
e. very long wavelength radio waves
Answer: D. Infrared
Infrared is the best way to observe it.
I need some help with this
It is B: low precision,low accuracy
Explanation:
Have a great day =)
11 An aeroplane is travelling horizontally at a speed of 80 ms", and drops a crate of emergency supplies
(Figure 2.39). To avoid damage, the maximum vertical speed of the crate on landing is 20 ms.
You may assume air resistance is negligible.
80 ms
Figure 2.39 For End-of-chapter Question 11.
a Calculate the maximum height of the aeroplane when the crate is dropped.
b Calculate the time taken for the crate to reach the ground from this height.
• The aeroplane is travelling at the maximum permitted height Calculate the horizontal distance travelled
by the crate after it is released from the aeroplane.
12
12
a.
The maximum height of the aeroplane when the crate is dropped is 20.41 m
Using v² = u² - 2gs where u = initial vertical speed of crate = -20 m/s(since it is falling), v = final vertical speed of crate = 0 m/s (since it stops immediately it lands), g = acceleration due to gravity = 9.8 m/s² and s = maximum height of airplane when crate is dropped.
So, making s subject of the formula, we have
s = -(v² - u²)/2g
Substituting the values of the variables into the equation, we have
s = (v² - u²)/2g
s = -((0 m/s)² - (-20 m/s)²)/(2 × 9.8 m/s²)
s = -(-400 m²/s²)/(19.6 m/s²)
s = 400 m²/s²/19.6 m/s²
s = 20.41 m
So, the maximum height of the aeroplane when the crate is dropped is 20.41 m
b.
The time taken for the crate to reach the ground from maximum height is 2.041 s
Using v = u + gt where u = initial vertical speed of crate = -20 m/s(since it is falling), v = final vertical speed of crate = 0 m/s (since it stops immediately it lands), g = acceleration due to gravity = 9.8 m/s² and t = time taken for the crate to reach the ground from maximum height.
Making t subject of the formula, we have
t = (v - u)/g
Substituting the values of the variables into the equation, we have
t = (v - u)/g
t = (0 m/s - (-20 m/s))/9.8 m/s²
t = (0 m/s + 20 m/s))/9.8 m/s²
t = 20 m/s/9.8 m/s²
t = 2.041 s
So, the time taken for the crate to reach the ground from maximum height is 2.041 s
c.
The horizontal distance travelled by the crate after it is released from the aeroplane is 163.27 m
Since the horizontal velocity of the crate is the horizontal velocity of the crate, we calculate the horizontal distance the crate travelled after it is released from the aeroplane.from
d = Vt where V = horizontal velocity of crate = 80 m/s and t = time taken for crate to drop from maximum height = 2.041 s.
So, substituting the values of the variables into the equation, we have
d = Vt
d = 80 m/s × 2.041 s
d = 163.27 m
So, the horizontal distance travelled by the crate after it is released from the aeroplane is 163.27 m
Learn more about projectiles here:
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