20.Two balls are in motion. A 2-kg ball moving at 4m/s and a 4-kg ball moving at 2m/s, which one has greater kinetic energy? a. 2 kg ball moving at 4 m/s c. Both balls have the same KE b. 4 kg ball moving at 2 m/s d. Cannot be determined
Answer:
A
Explanation:
Given that two balls are in motion. A 2-kg ball moving at 4m/s and a 4-kg ball moving at 2m/s, which one has greater kinetic energy? a. 2 kg ball moving at 4 m/s c. Both balls have the same KE b. 4 kg ball moving at 2 m/s d. Cannot be determined
The formula for kinetic energy is :
K.E = 1/2mv^2
A 2-kg ball moving at 4m/s will have kinetic energy of 1/2 × 2 × 4^2
K.E = 16J
and a 4-kg ball moving at 2m/s will have kinetic energy of 1/2 × 4 × 2^2
K.E = 2 × 4
K.E = 8J
which one has greater kinetic energy? Definitely it is a 2 kg ball moving at 4 m/s. Since 16J is greater than 8J. The correct answer is A.
The energy which we obtained from the moving particle is called kinetic energy. According to the conservation of energy, the energy can neither be created nor be destroyed.
Hence, the formula used in the question is:- \(K.E =\frac{1}{2} mv^{2}\) .
A 2-kg ball moving at 4m/s will have kinetic energy that is \(K.E =\frac{1}{2} 2*4^{2} = 16J\)Therefore, the kinetic energy of the ball moving the 2kg is 16J.
A 4-kg ball moving at 2m/s will have kinetic energy that is \(K.E =\frac{1}{2} 4*2^{2} = 8J\)
Hence the Kinetic energy of the ball moving the 4 kg is 8J.
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Which of the following below would have the largest moment magnitude
A. A fault that is 1000 km in length, 100 km in width and a slip of 20 meters
B. A fault that is 10,000 meters in length 10,000 meters in width and 1 meter of slip
C. A fault that is 10 km in length, 100 km in width and a slip of 3 meters
D. A fault that is 100 km in length, 100 km in width and a slip of 0 meters
Option B would have the largest moment magnitude among the given options.
The moment magnitude of an earthquake is determined by the length, width, and slip of a fault. It is given by the equation M = μAΔD, where M is the moment magnitude, μ is the rigidity of the rocks along the fault, A is the area of the fault, and ΔD is the average slip on the fault.
Comparing the options:
A. Fault length = 1000 km, width = 100 km, slip = 20 meters
B. Fault length = 10,000 meters, width = 10,000 meters, slip = 1 meter
C. Fault length = 10 km, width = 100 km, slip = 3 meters
D. Fault length = 100 km, width = 100 km, slip = 0 meters
To determine the moment magnitude, we need to calculate the product of area and slip. The fault with the largest moment magnitude will have the greatest product of area and slip.
Option A: Area = 1000 km * 100 km = 100,000 km², Slip = 20 meters
Option B: Area = 10,000 meters * 10,000 meters = 100,000,000 m², Slip = 1 meter
Option C: Area = 10 km * 100 km = 1,000 km², Slip = 3 meters
Option D: Area = 100 km * 100 km = 10,000 km², Slip = 0 meters
Calculating the products:
Option A: Product = 100,000 km² * 20 meters = 2,000,000 km·m
Option B: Product = 100,000,000 m² * 1 meter = 100,000,000 m·m
Option C: Product = 1,000 km² * 3 meters = 3,000 km·m
Option D: Product = 10,000 km² * 0 meters = 0 km·m
Comparing the products, we find that Option B has the largest moment magnitude with a product of 100,000,000 m·m. Therefore, Option B would have the largest moment magnitude among the given options.
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In a ______ solar system, the planets orbit around the sun.
A. Geocentric
B. Monolithic
C. Heliocentric
D. Pericentric
An 810 kg dragster was decelerated by a parachute at 2.5 m/s2, as shown in the diagram.
What is the tension in the cord at this moment?
Answer:
2.0 x 10∧3 N
Explanation:
Took the test and this was the correct answer
Hope this helps
What is the percentage efficiency of a 70W bulb that produces 210J of light energy over a minute?
Answer:
5%
Explanation:
here
power = 70w
output = 210 J
time = 1 mins = 60 secs
for total input we get
input energy = P*t
= 70*60 = 42000J
for the efficiency we know that
%efficiency = (total output / total input ) * 100%
= (210/42000) * 100%
= 5%
Answer:
Explanation:
Given:
P = 70 W - Lamp power
A = 210 J - Lamp energy
t₀ = 1 min = 60 s - Time
_________
ε - The percentage efficiency
t = A / P = 210 / 70 = 3 s
ε = t / t₀ = 3 / 60 = 0.05 or ε = 0,05·100% = 5%
Particles of light are known as A. electrons. B. neutrinos. C. photons. D. bosons.
Answer:
C. photons
hope this helps
have a good day :)
Explanation:
Answer:
The answer would be c
Explanation:
Spring tides occurs at two of the time shown which two? how do u know ?
Spring tides are extremely wide ranges of tidal highs and lows that occur during full moon or new moon phases when the gravitational forces of the Sun and Moon are at their strongest.
Neap tides are characterized by lower high tides and higher low tides, while spring tides feature higher high tides and lower low tides. Because of this, a spring tide has a significantly wider range than a low tide (the difference in water level between high and low tide).Spring tides are the tides that occur right after a new or full moon when the difference between high and low water is the biggest. The earth, moon, and sun are in a straight line at this time, causing the gravitational pull to be at its strongest. There are more high tides than usual and fewer low tides than usual.To know more about spring tides
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Un automovil transita por una curva en forma de U y recorre una distancia de 400m en 30s sin embargo su posición final está a solo 40 m de la inicial ¿Cuál es la rapidez media y cuál es la magnitud de la velocidad media?
Answer:
Definimos:
Rapidez media es igual al cociente entre la distancia recorrida y el tiempo que se tarda en recorrer esa distancia.
En este caso la distancia recorrida es 400m, y el tiempo que se tarda es 30s, entonces la rapidez media va a ser:
RM = 400m/30s = 13.33 m/s
La velocidad media por otro lado, es igual al cociente entre el desplazamiento y el tiempo necesario para desplazarse.
El desplazamiento es igual a la distancia entre la posición final y la posición inicial, que en este caso eso 40m, y el tiempo necesario sigue siendo 30s, entonces la velocidad media va a ser:
VM = 40m/30s = 1.33 m/s
Properly identify the features of an impact crater using this image of a Moon crater.
a. furthest left: ray
b. middle: central peak
c. middle right: crater wall
d. top right: secondary crater
Well, discover the capabilities of an effect crater using this picture of a Moon crater. b. middle: central peak
Craters are the most commonplace surface functions on many stable planets and moons—Mercury and our Moon are covered with craters. This portion of the Moon is protected by using numerous circular holes. these are effect craters, every of which became formed whilst an asteroid or comet collided with the Moon's surface.
Tycho Crater is one of the maximum distinguished craters on the Moon. It seems like a bright spot in the southern highlands with rays of vivid fabric that reach throughout plenty of the nearside. Tycho's prominence isn't because of its size. The steep cliff – the internal wall of the crater – rises a fantastic 9,843 ft (3,000 meters) above the bottom of the crater, in which you notice a massive soft pool of historic liquified rock, left over from the large effect that created the crater.
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due to the high sensitivity of digital detectors to low intensity radiation (background, scatter and/or off-focus radiation), there is likely to be scatter and off-focus radiation contributing to the image outside the collimation margins. since many radiologists find this distracting, the most appropriate radiographer action would be to:
Due to the high sensitivity of digital detectors to low intensity radiation, such as background, scatter, and off-focus radiation, it is common for these factors to contribute to the image outside the collimation margins.
As many radiologists find this distracting, the most appropriate radiographer action would be to apply proper collimation and shielding techniques to minimize scatter and off-focus radiation, as well as utilizing post-processing methods to reduce the appearance of such artifacts in the final image.
The most appropriate radiographer action would be to adjust the collimation margins to exclude any scatter and off-focus radiation outside the area of interest. This will improve the image quality and reduce the distraction for radiologists. Additionally, the radiographer should ensure proper patient positioning and use appropriate shielding to further minimize scatter and off-focus radiation. Regular quality control checks should also be performed to monitor and maintain the accuracy and safety of the imaging equipment.
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when an atom is unstable it will ___ into a new atom
Answer:
When an atom is unstable it will change into a new atom
if it is critical that you measure the wavelengths precisely for a given lamp which of the following grating would you use 800 lines/cm, 400 lines/cm or 100 lines/cm and why
If it is critical to measure the wavelengths precisely for a given lamp, the grating with the highest number of lines per centimeter (lines/cm) should be used. In this case, the grating with 800 lines/cm would be the most suitable option.
Gratings are optical devices with a periodic pattern of equally spaced lines or grooves. They are commonly used in spectroscopy to disperse light into its component wavelengths. The number of lines per centimeter on a grating determines its resolution or ability to separate closely spaced wavelengths.
Higher line densities (more lines/cm) provide finer resolution and allow for more precise measurement of wavelengths. With a grating having 800 lines/cm, it would offer a higher resolution compared to the gratings with 400 lines/cm or 100 lines/cm. This means it would enable more accurate determination of the specific wavelengths present in the lamp's emission spectrum.
By using the grating with the highest line density, finer details in the lamp's spectrum can be resolved, resulting in more precise measurements of the wavelengths.
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Wings produce a downward force .Why would this be useful to a race car?
Answer:
it increases drag
Explanation:
Which statement describes a difference between insulators and conductors?(1 point)
Insulators have high conductivity, while conductors have low conductivity.
Insulators can transmit electric current, while conductors cannot.
Insulators are made of metallic materials, while conductors are not.
Insulators have high resistance, while conductors have low resistance.
Answer:
The "Insulators have high resistance, while conducters have low resistance".
The difference between insulators and conductors is insulators have high resistance, while conductors have low resistance.
What is insulator?An insulator is a material that does not allow easy passage of electric current through it. In other words, these materials have high resistance to the flow of current.
What is conductor?A conductor is a material that allows easy passage of electric current through it. In other words, these materials have low resistance to the flow of current.
Thus, the difference between insulators and conductors is insulators have high resistance, while conductors have low resistance.
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3. A fire hose is turned on, it exerts a pressure of 10kPa. If the diameter of the
jet is 0.6m, what is the force exerted? (remember there are 1000Pa to a kPa,
and the area of a circle is found by multiplying Pi by the radius squared).
The force exerted by the fire hose is 2.827 kN
force excerted calculation.
First, we need to calculate the area of the jet using the formula for the area of a circle:
Area = π x (radius)^2
We know the diameter of the jet is 0.6m, so the radius is half of that
radius = 0.6m / 2 = 0.3m
Plugging this value into the formula, we get:
Area = π x (0.3m)^2 = 0.2827 m^2
Next, we can use the formula for pressure to calculate the force exerted:
Pressure = Force / Area
Rearranging this formula to solve for force, we get:
Force = Pressure x Area
Plugging in the given values, we get:
Force = 10 kPa x 0.2827 m^2 = 2.827 kN
Therefore, the force exerted by the fire hose is 2.827 kN (kilonewtons).
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A particle starts to move in a straight line with a velocity of 10 m/s
and deceleration - 2 m s-2. What will the velocity of particle be after
5 s and after 10 s?
a 30 m/s after 5 s and 20 m/s after 10 s.
b Zero after 5 s and 30m/s after 10 s.
C 20 m/s after 5 s and 30 m/s after 10 s.
d Zero after 5 s and -10 m/s after 10 s.
Answer:
Explanation:
Lol man
Answer: Zero after 5 s and -10 m/s after 10s
Explanation:
A girl kicks a blue ball with a velocity of 20.0 m/s at 65.0o. How long is it in the air?
1.85s
1.92s
13.6s
3.69s
Explanation:
t = usin©/g
Where t is the time to reach the maximum height
Time spent in air is T = 2t
Hence, T = 2usin©/g
T = 2 x 20 x sin 65°/ 9.8
T = 3.69s
the mass of a meteoroid was found to be 1.24 × 10^7 kilograms. Write the mass in standard notation.
Answer:
Explanation:
12,400,000
If an object is in free fall, on the way down it will
Answer:
It will find a worm when it hits the ground and starts Johnny sins fvcl<ing the worm
The relationship that exists between gravity and distance and mass respectively.
A. The gravitational force is directly proportional to the distance between objects and inversely
proportional to the mass of the objects.
B. The gravitational force is inversely proportional to the distance between objects and directly
proportional to the mass of the objects.
C. The gravitational force is inversely proportional to the distance between objects and inversely
proportional to the mass of the objects.
D. The gravitational force is directly proportional to the distance between objects and directly
proportional to the mass of the objects.
Answer:
D...............................
A high surface tension results from _____.
Answer:
Capillary Action.
Explanation:
Capillary action is the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.
When sunlight reflects from a thin film of soapy water (air on both sides), the film appears multicolored, in part because destructive interference removes different wavelengths from the light reflected at different places, depending on the thickness of the film. What happens as the film becomes thinner and thinner at the edges
As the film becomes thinner and thinner at the edges, the colors that are reflected begin to shift and become less vibrant.
This is due to the fact that the thickness of the film is becoming closer and closer to the wavelength of the light that is being reflected. When this happens, the light waves start to interfere destructively, which means that the peaks of one wave will meet with the troughs of another wave and cancel each other out.
This destructive interference causes certain colors to disappear from the reflected light, resulting in a duller appearance. The colors that are still visible may appear washed out or pale. Additionally, the location of the color bands may shift slightly as the thickness of the film changes, making it difficult to predict exactly what colors will be seen at the thinnest parts of the film.
Overall, the effect of the thinning edges on the reflected light is to create a less intense, less predictable, and less vibrant display of colors.
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Which statement best describes the direction of heat flow by conduction between two samples of the same material? heat flows from faster molecules to slower molecules when they are near. Heat flows from faster molecules to slower molecules when they collide. Heat flows from slower molecules to faster molecules when they are near. Heat flows from slower molecules to faster molecules when they collide.
Answer:
B
Explanation:
The statement that best describes the direction of heat flow by conduction between two samples of the same material is that heat flows from faster molecules to slower molecules when they collide.
How does heat flow by conduction?Heat refers to the difference in temperature between two substances. Heat flows in the direction of an hot substance to cold.
However, in a hot substance, the particles move faster than that of a cold substance.
Therefore, the statement that best describes the direction of heat flow by conduction between two samples of the same material is that heat flows from faster molecules to slower molecules when they collide.
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17.Shenna is observing two mineral samples in science class. He records his observations of the
samples in
the table below,
Minerals
Pyrite
Description
cubic crystals
Mica
breaks into thin sheets
Which property of the samples has Shenna recorded?
A. cleavage
B. hardness4
C. luster
D. streak
Shenna has recorded the property of cleavage. Cleavage refers to the tendency of a mineral to break along flat, smooth planes due to its internal structure.structure.So,The correct option would be (A) Cleavage.
Cleavage is a property that describes how a mineral breaks along planes of weakness, resulting in smooth, flat surfaces. It is one of the key characteristics used to identify and classify minerals.
In the given observations, Shenna noted that the mineral sample called "Mica" breaks into thin sheets. This characteristic indicates that Mica exhibits cleavage. When Mica is subjected to stress or force, it breaks along flat planes, resulting in thin, sheet-like fragments.
On the other hand, Shenna described the mineral sample called "Pyrite" as having cubic crystals. While this information is valuable for identifying Pyrite, it does not pertain directly to the property of cleavage.
Shenna has recorded the property of cleavage based on his observation that the mineral sample called "Mica" breaks into thin sheets.sheets.Hence the correct answer is Cleavage. Cleavage refers to the tendency of a mineral to break along flat, smooth planes due to its internal structure.
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Calculate the magnitude and direction of the centripetal acceleration of the following objects moving in a circle:
A 2000 kg truck drives along a circular round a bout with a radius of 20 m at a constant speed of 10 m/s.
Answer:
The magnitude and direction of the centripetal acceleration will be:
\(a_c=5\) m/s² (towards the center of the circle).
Explanation:
Given
v = 10 m/sr = 20 mUsing the formula to determine the centripetal acceleration
\(a_c=\frac{v^2}{r}\)
\(a_c=\frac{\left(10\right)^2}{20}\)
\(\:a_c=\frac{100}{20}\)
\(a_c=5\) m/s²
As the truck is moving in a circle, therefore the direction is towards the center of the circle.
Hence, the magnitude and direction of the centripetal acceleration will be:
\(a_c=5\) m/s² (towards the center of the circle).
a contact lens is made of plastic with an index of refraction of 1.50. the lens has an outer radius of curvature of 2.00 cm and an inner radius of curvature of 2.50 cm. what is the focal length of the lens?
The focal length of the lens is 2.22 cm (positive).
To determine the focal length of the lens, we can use the lensmaker's formula:
1/f = (n - 1) * (1/R1 - 1/R2),
where f is the focal length,
n is the refractive index of the lens material,
R1 is the radius of curvature of the first surface (outer surface), and
R2 is the radius of curvature of the second surface (inner surface).
Given that the refractive index of the lens material is 1.50, R1 = 2.00 cm, and R2 = -2.50 cm (negative sign indicates the surface is concave), we can substitute these values into the formula:
1/f = (1.50 - 1) * (1/2.00 - 1/-2.50).
1/f = 0.50 * (0.50 + 0.40)
1/f = 0.50 * 0.90
1/f = 0.45.
Taking the reciprocal of both sides:
f = 1/0.45,
f ≈ 2.22 cm.
Since the lens is converging (convex on both sides), the focal length is positive. Therefore, the focal length of the lens is approximately 2.22 cm.
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So the Fahrenheit scale has 180 divisions. But its highest temperature is 212. Im kinda confused..... what is the purpose of divisions??
Answer:
The melting and boiling point of water in Fahrenheit scale is divided into 180 equal intervals, that means each division denoting 1°F.
division means their melting and boiling point is divided into 180 equal intervals that means each division indicates 1 degree F.
which laser can be operated at either continuous wave or pulsed settings. its active medium is a semi-conductor and emits in the near infrared portion of the electromagnetic spectrum. this laser is a(an)
This laser is most likely a Diode Laser.
A diode laser is a laser that uses a semiconductor material as the active medium, which is the material responsible for generating the laser light. Laser diodes can produce a narrow beam of laser light in which all the light waves have similar wavelengths. Because of this property, laser beams are very bright and can be focused over a very tiny spot.The near-infrared portion of the electromagnetic spectrum refers to the range of wavelengths between 780-1400 nanometers. This laser can be operated in both continuous wave and pulsed settings, which means it can emit laser light in a constant beam or in short bursts. Diode lasers are commonly used in a variety of applications, including medical, scientific, and industrial applications.To know more about diode laser visit:
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The internet is based on this concept of using optical fibers to send information.
True or False?
Answer:
False
Explanation:
The internet uses various mediums (fibre optic being only one of the newer ones) to transfer information.
a scientist notes a pretty oil slick on the surface of a body of water. she aims her spectrometer at a spot on the oil slick to measure the wavelength that is being most strongly reflected. the oil index is 1.2, and she finds maximum reflection at a wavelength of 750 nm. what is the thickness of the oil layer in nm?
These thin films have a thickness that varies from 15 nm, or 1/30 the length of light waves, to 3000 nm, or 6 times the wavelength od visible light, or about 3 microns.
How do you gauge the thickness of oil?Microns (m), or one thousandth of a meter, are used to quantify the thickness of oil films in machinery. Figure 1 depicts a natural hair, that measures 70 to 100 m (0.003 to 0.004 inch) in length, under an electron microscope. The smallest object that a human can see is 40 m, or roughly the width of a hairs.
Which number has heavier oil?The oil is thicker the higher the number. The oil is thinner the lower the number. A grade of 5W-30, for instance, indicates that the oils has a velocity grade of 30 at 212°F, or 100°C, the typical working temperature of an engine.
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