Answer:
D!!! im sure of it!
Explanation:
its correct in plato
a force pushes the cart for 1 s, starting from rest. to achieve the same speed with a force half as big, the force would need to push for
Answer: Harder than you pushed it before.
Explanation: You would want to push it harder so that it can go more farther and so the more force you push the father it would go.
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.
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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
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Laquita is a competitive diver. She made it to the semi-final round of Olympic tryouts but did not make the team. How should she interpret this loss?
A.
as a sign that her hard work has been wasted and she should find a new sport
B.
as an indication that she should fire her coach and find someone more competent
C.
as an indication that she will definitely win if she comes back again
D.
as a sign that she is an exceptional athlete with a great deal of potential
PLEASE NO LINKS
Answer:
D
Explanation:
What is the equation for power?
Answer:
P = E/t
Explanation:
an object is hung on a spring scale and is measured to have a force of the Earth of 7.45 N. What is the mass if the object
The mass of the object hung on the spring is 0.76 kg.
The given parameters;
weight of the object, F = 7.45 NThe mass of the object is determined by applying Newton's second law of motion as shown below;
F = mg
where;
g is acceleration due to gravity on Earth = 9.8 m/s²The mass of the object is calculated as;
[tex]m = \frac{F}{g} \\\\m = \frac{7.45}{9.8} \\\\m = 0.76 \ kg[/tex]
Thus, the mass of the object hung on the spring is 0.76 kg.
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Because of thermal expansion and cold flow of aluminum, standard copper____________ cannot be safely used on aluminum wire.
Thermal expansion occurs because of a change in temperature to the material. It affects the shape, area, volume and even the density of the material. Thermostats which is present in millions of cars are operated by using the expansion of metal. It is also used in the heat switch on many types of machinery and home appliances. Because of thermal expansion and cold flow of aluminum, standard copper conductor cannot be safely used on aluminum wire.
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15 POINTS!!!!!
Shondra has decided to become a vegetarian. She just cut meat out of her diet, so her body is still adjusting. For the past day or two she is always hungry and is having trouble focusing. What is her body MOST likely adjusting to in this situation?
A.
a decrease in fats
B.
a decrease in water
C.
a decrease in protein
D.
a decrease in carbohydrates
PLEASE NO LINKS
Answer:
The answer is "A"
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1. What can you observe from the frequency and wavelength of the colors of light?
2. Which color spectrum has the highest frequency?
3. Which color spectrum has the highest energy?
4. Which color has the lowest frequency?
5. Which among the seven colors has lowest energy?
#1
The relationship between frequency and wavelength is
[tex]\\ \sf\longmapsto \lambda=\dfrac{c}{v}[/tex]
lambda is wavelengthv is frequencyc is speed of light .#2
Violet has the highest frequency i.e 750Hz
#3
Violet has the highest energy i.e 3.1eV
#4
Red has the lowest frequency
#5
Red among the seven colors have lowest energy.
**100 points** PLEASE ANSWER IN 3 PARAGRAPHS
How do centripetal force, mass, and radius affect the velocity of an object moving with uniform circular motion?
Answer:
In the previous section, we defined circular motion. The simplest case of circular motion is uniform circular motion, where an object travels a circular path at a constant speed. Note that, unlike speed, the linear velocity of an object in circular motion is constantly changing because it is always changing direction. We know from kinematics that acceleration is a change in velocity, either in magnitude or in direction or both. Therefore, an object undergoing uniform circular motion is always accelerating, even though the magnitude of its velocity is constant.
You experience this acceleration yourself every time you ride in a car while it turns a corner. If you hold the steering wheel steady during the turn and move at a constant speed, you are executing uniform circular motion. What you notice is a feeling of sliding (or being flung, depending on the speed) away from the center of the turn. This isn’t an actual force that is acting on you—it only happens because your body wants to continue moving in a straight line (as per Newton’s first law) whereas the car is turning off this straight-line path. Inside the car it appears as if you are forced away from the center of the turn. This fictitious force is known as the centrifugal force. The sharper the curve and the greater your speed, the more noticeable this effect becomes.
Figure 6.7 shows an object moving in a circular path at constant speed. The direction of the instantaneous tangential velocity is shown at two points along the path. Acceleration is in the direction of the change in velocity; in this case it points roughly toward the center of rotation. (The center of rotation is at the center of the circular path). If we imagine Δs becoming smaller and smaller, then the acceleration would point exactly toward the center of rotation, but this case is hard to draw. We call the acceleration of an object moving in uniform circular motion the centripetal acceleration ac because centripetal means center seeking.
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ME AJUDEM PORFAVORR????
which part of the electromagnetic spectrum has a lower frequency than visible light?
Answer:
radio waves
Explanation:
radio waves have lower frequency than visible light
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 Playerparticle moves along the x axis. Its position is given by the equation x-2 +3t-1t,with x in meters and t in seconds. Determine its position when it changes direction?
Answer:
35on 5gcghh finds do go CNN chk
How does the width of the floodplain change over time?
Evaporation is a process which tends to keep temperatures cooler where it occurs. This is because evaporation increases the reflection of solar energy. increases the specific heat. increases the outgoing radiation. uses energy to change the phase of water instead of warming it. reduces the absorption of solar energy.
Answer:
yes makes sense
Explanation:
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
Is this a scientific model? Use complete sentences to explain why or why not.
A world map showing vegetation
Answer:
yes because it caries a message on ecological and evolutionary assembly of the classified vegetation and flora. Its known to be called a Vegetation map or Vegetation Mapping.
Explanation:
which layer of the earth contains convection currents
boat travels through a river at a speed of 25 m/s, passing through schools and opening the soundtrack. One student measured frequency 610 Hz. Turns out, four seconds later, the student again measured frequency 587 Hz if the river was a straight line 20 m wide and the speed of sound is 340 m/s. find school distance from coast?
Answer:
sorry i need points so......
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.:)
what is the relationship between frequency and pitch?
Andrew is riding his bike is riding in a circle that has a radius of 10 m. He keeps
his speed at a constant 6 m/s. What acceleration does Andrew experience
during his ride?
The acceleration that Andrew experience during his ride is 3.6m/s²
The formula for calculating centripetal acceleration is expressed as:
a = v²/r
v is the speed
r is the radius
Given the following expression
v = 6m/s
r = 10m
Substitute the given parameters into the formula
a = 6²/10
a = 36/10
a = 3.6m/s²
Hence the acceleration that Andrew experience during his ride is 3.6m/s²
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During a single period, the distance traveled by a wave is:
Answer:
wavelength
Explanation:
wavelength is the distance from crest to crest or from trough to trough. The wavelength can also be thought of as the distance a wave has traveled after one complete cycle—or one period
https://youtu.be/tJW_a6JeXD8
During a single period, the distance traveled by a wave is one wavelength. The correct option is b.
What is a wavelength?The distance between identical points (adjacent crests) in adjacent cycles of a waveform signal propagated in space or along a wire is defined as the wavelength.
This length is typically specified in wireless systems in meters (m), centimeters (cm), or millimeters (mm) (mm).
The wavelength is the distance between two wave crests, and it is also the distance between two wave troughs.
The frequency is measured in cycles per second and is the number of vibrations that pass over a given spot in one second (Hertz).
The color of light is determined by its wavelength, and the pitch of sound by its wavelength.
The wavelengths of visible light range from approximately 700 nm (red) to 400 nm (violet). The wavelength of audible sound is approximately 17 mm to 17 m.
Thus, the correct option is b.
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Your question seems incomplete, the missing options are:
A) one-half wavelength.
B) one wavelength.
C) two wavelengths.
A thermodynamic system is taken from state a to state c in the figure (Figure 1)along either path abc or path adc. Along path abc the work W done by the system is 450J. Along path adc, W is 120J. The internal energies of each of the four states shown in the figure are Ua=150J,Ub=240J,Uc=680J, and Ud=330J.
Answer:
A) 90
B)absorbs heat
C)890
D)absorbs heat
E)300
F)absorbs heat
G)350
h) absorbs heat
Explanation:
A)heat flow ab
240-150=90
C) heat flow bc
680-240=440
work done =450
440+450= 890
E) heat flow ad
330-150=180
work done= 120
180+120=300
G)heat flow dc
680-330=350
One hydrogen will be able to bond to how many other atoms?
Answer:
1
Explanation:
hydrogen has one electron therefor only being able to bond with one other
If a system does 31.0 kJ of work on its surroundings and releases 105 kJ of heat, what is the change in the internal energy of the system, in kJ
Answer:136 kj
Explanation:
If a system does 31.0 kJ of work on its surroundings and releases 105 kJ of heat, what is the change in the internal energy of the system, in kJ
the system spent 32.0 kj in work and 105 kj in heat, so it spent a total of
31 +105 =136 kj
NEED HELP!!
Tracking your exercise can help you stick with an exercise routine.
A.
True
B.
False
Answer:
Yes it can A
Explanation:
Answer:
The correct choice is A. True
Explanation:
Tracking your exercise can help you stick with an exercise routine because it lets you see how you are progressing in terms of reaching your previously set goals.
Describe the motion of a ball thrown across a room using physics terms such as velocity, acceleration, and
force.
The force of gravity affects the upward motion of the ball causing a decrease in the velocity and acceleration of the ball as it moves upwards.
The motion of a ball thrown across a room is affected by force of gravity which causes the ball to fall to the floor.
The velocity of the ball decreases as the ball moves upwards and eventually becomes zero at maximum height, which starts to increase again as the ball begins fall down.
The acceleration of the ball is directed downwards during the motion.
Thus, we can conclude that the force of gravity affects the upward motion of the ball causing a decrease in the velocity and acceleration of the ball as it moves upwards.
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What is the valence shell
