its either true or false not sure which one i just know it one of those 2
why is it not advisable to touch a canvas tent from inside when it is raining?
Answer: When you touch wet canvas, surface tension will draw water to your finger. However, the drop left behind where you touched, like any irregular point on an overhead surface, will draw condensation from inside the tent if it is humid.
2. A javelin is thrown through an angle of 30o to the horizontal. Find the time taken by the javelin to reach the maximum height if the initial velocity is 60ms-1 [ take g =10 ms-1]
Answer:
3 seconds
Explanation:
The initial velocity is 60 m/s at an angle of 30° to the horizontal, so we can calculate the initial velocity in the vertical direction as
Viy = Vi sin(θ)
Viy = 60 sin(30)
Viy = 60(0.5)
Viy = 30 m/s
Then, we can use the following equation to calculate the time that it takes to reach the maximum height.
\(\begin{gathered} v_{fy}=v_{iy}-gt \\ v_{fy}+gt=v_{iy} \\ gt=v_{iy}-v_{fy} \\ \\ t=\frac{v_{iy}-v_{fy}}{g} \end{gathered}\)At a maximum height the vertical velocity is 0 m/s, so replacing viy = 30 m/s, vfy = 0 m/s and g = 10 m/s², we get
\(\begin{gathered} t=\frac{30\text{ m/s-0m/s}}{10\text{ m/s}^2} \\ \\ t=\frac{30\text{ m/s}}{10\text{ m/s}^2} \\ \\ t=3\text{ s} \end{gathered}\)Therefore, the answer is 3 seconds
what are density in physics
Answer:
Density Definition: Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.
How to describe the motion, and velocity of a moving man
Answer:
You can describe the motion of an object by its position, speed, direction, and acceleration. An object is moving if its position relative to a fixed point is changing. Even things that appear to be at rest move.
Explanation:
which type of electromagnetic waves has highest frequency
Answer:
Gamma rays have the highest energies.
Explanation:
HOPE IT WILL HELP ^_^
Answer:
Gamma rays have the highest frequencies.
Explanation:
as part of a lab experiment, allison uses an air-track cart of mass to compress a spring of constant by an amount from its equilibrium length. the air track has negligible friction. when allison lets go, the spring launches the cart. what cart velocity should she expect after it is launched by the spring?
Cart velocity should she expect after it launched by the spring is: 0.63 m/s.
When Allison compresses the spring of constant k by an amount x from its equilibrium length, she should expect the cart to be launched with a velocity given by the equation v = (kx)1/2. In other words, the cart velocity is determined by the spring constant and the amount the spring is compressed from equilibrium.
To calculate the expected cart velocity, multiply the spring constant k by the amount the spring is compressed from equilibrium x, then take the square root of the result. For example, if Allison compresses the spring by 0.2 m from its equilibrium length, and the spring constant is 10 N/m, the cart velocity should be (10 * 0.2)1/2, or approximately 0.63 m/s.
It's important to note that the air track has negligible friction, so all of the energy initially stored in the compressed spring is transferred to the cart, giving it a certain velocity. With this in mind, Allison should expect the cart velocity to be determined solely by the spring constant and the amount the spring is compressed from equilibrium.
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If the mass of one proton (1.67×10−27
1.67
×
10
−
27
k
g
) is totally converted into energy, it will yield a total energy of -
The proton of mass 1.67×10⁻²⁷ kg is converted into energy, it yields a total energy of 932MeV.
By using the Einstein mass-energy equivalence, energy is directly proportional to the mass. Energy is obtained from the product of the mass and velocity of the light. The unit of energy in terms of (electron volt) eV.
From the given,
the proton of mass(m) = 1.67×10⁻²⁷ kg
the velocity of light (c)= 3×10⁸ m/s.
mass-energy equivalence
E = mc²
= 1.67×10⁻²⁷×3×10⁸×3×10⁸
= 15.03×10⁻¹¹/1.6×10⁻¹⁹
= 939MeV.
Thus, the energy yielded by the proton when its mass is converted into energy is 939MeV.
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Consider a field of insects, all of which have essentially the same mass.
a. If the total momentum of the insects is zero, what does this imply about their motion?
b. If the total kinetic energy of the insects is zero, what does this imply about their motion?
If the total momentum of the insects is zero, this means all of the insects are at rest or are moving in opposite of each other. Same if the total kinetic energy is zero.
What is momentum?Momentum is the quantity of motion which is multiplied by the amount of matter moved i.e., mass and the velocity at which it moves. Because, the object is in motion, it is a vector quantity, it has both direction and magnitude. It is determined by the product of the object's mass and the velocity of object.
If the total momentum of the insects is zero, this could mean anything of the two things. Either, all of the insects are at rest or an equal amount of insects are moving in opposite direction of each other which cancels out the total momentum of the insects.
If the total kinetic energy of the insects is zero, this means either all of the insects are at rest or an equal amount of insects are moving in opposite direction of one another which results into canceling out the energy.
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A bowling ball and a ping-pong ball are each tied to a string and hung from the ceiling. The distance from the ceiling to the CM of each object is the same. Which object would have a longer period of motion if they were set swinging
1. When a ball is dropped and accelerates in free
fall downwards, what objects are interacting in
this situation?
a. The ball and your hand
b. The ball and the Earth
c. The ball and the air
d. The ball and gravity
Answer:
B
Explanation:
When the ball is dropped, Earth's mass generates a gravitational force, making it fall downward towards the ground.
You've got a flat tire. To lift your car, you make a homemade lever (see the figure (Figure 1)). A very light 1.6-m-long handle part is pushed down on the right side of the fulcrum and a 0.050-m-long part on the left side supports the back of the car.
How hard must you push down on the handle so that the lever exerts an 6900- N force to lift the back of the car?
How hard you must push down on the handle is by applying a force of 215.63 N
Moment of a forceThe moment of a force about a point is the turning effect of the force about that point.
The moment of a force M = Fd where
F = force and d = perpendicular distance of force from pivot point.Now, for you to lift up the car, the moment due to your force about the fulcrum, M equals the moment due to the force on back of car. M'
M = M'
FD = F'd where
F = Force applied, D = distance of force from fulcrum = 1.6 m, F' = force applied on back of car = 6900 N and d = distance of force on back of car from fulcrum = 0.050 mMaking F subject of the formula,we have
F = F'd/D
Substituting the values of the variables into the equation,we have
F = F'd/D
F = 6900 N × 0.050 m/1.6 m
F = 345 Nm/1.6 m
F = 215.625 N
F ≅ 215.63 N
So, how hard you must push down on the handle is by applying a force of 215.63 N
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A resistor has a resistance of 50 Ohms. If a 9V battery is connected to it, how much current flows in the wire?
Answer:
0.18 A or 180 mA
Explanation:
\(I=\frac{V}{R} =\frac{9}{50} =0.18\)
I hope this help you
Divers at Acapulco dive from a cliff that is 61 m high. If the rocks below the cliff extend outward for 23 m, what is the minimum horizontal velocity a diver must have to clear them?
Answer:6.5 m/s
Explanation:Look at the image I believe that's the answer
The horizontal velocity of the diver would be 6.522 meters / seconds.
What are the three equations of motion?There are three equations of motion given by Newton
v = u + at
S = ut + 1/2×a×t²
v² - u² = 2×a×s
As given in the problem, Divers at Acapulco dive from a cliff that is 61 m high. If the rocks below the cliff extend outward for 23 m, then we have to find out the minimum horizontal velocity a diver must have to clear them,
By using the second equation of motion in the vertical direction,
s = ut + 0.5at²
61 = 0+ 0.5×(-9.81) ×t²
t² = 61/(0.5×9.81)
= 12.43
t = 3.526 seconds
The horizontal velocity of the diver = 23 meters / 3.526 seconds
=6.522 meters / seconds
Thus, the horizontal velocity of the diver would be 6.522 meters/second.
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Suppose a spectral line of hydrogen, normally at 500 nm when measured in a lab on Earth, is observed in the spectrum of a star to be at 500.3 nm. This is called a red shift because the wavelength is longer (and red is on the long-wavelength side of the visible spectrum). How fast is the star moving away from Earth? Give your answer in m/s. Hint: follow example 5.6. Compare in particular to the "Check your learning" calculation, and note that larger Δλ means larger speed.
The star is moving away from Earth at a velocity of 1.8 x 106 m/s.
The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.
The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.
The velocity of a star moving away from Earth can be determined using the equation:
v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).
In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.
The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.
Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.
Therefore, velocity of star 1.8 x 106 m/s.
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g a student actor is wearing a purple costume on the theatrical stage. what color will the costume appear if a green light illuminates the student?
When a green light illuminates a purple costume on a theatrical stage, the color of the costume will appear as a darker shade of green. This is due to the subtractive color model, which states that colors are created when light is reflected off of an object and absorbed by the object.
In this case, the purple costume is reflecting green light and absorbing all other colors, resulting in a darker shade of green. This effect is even more dramatic when the light is brighter, resulting in a nearly black color.
The color of a costume is also affected by the lighting equipment used, such as the color and power of the light. This means that the costume’s color can be changed based on the lighting used on the stage.
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Jeremy pulls a slinky a distance of 13 inches from its equilibrium position and then releases it. the time for one oscillation is 1 second.
step 1 of 2: find the amplitude and period of the slinky.
5 sin(2πt/3) is the displacement of the slinky undergoing oscillation. The amplitude is 13 inches.
The displacement of the slinky as a function of time can be modeled by a sinusoidal function of the form:
y = A sin(2πft + φ)
If the distance is changed to 13 inches and the time for one oscillation is changed to 1 second, the amplitude of the oscillation becomes 13 inches and the frequency becomes 1 oscillation per second. The phase shift remains 0. Substituting these values into the equation for the displacement of the slinky, we get:
y = 13 sin(2π(1)t + 0)
= 13 sin(2πt)
This is the function that describes the displacement of the slinky as a function of time, given the updated values for the distance and oscillation time. Note that this function is the same as the displacement function for a simple harmonic oscillator, which is a system that undergoes oscillatory motion with a frequency that is directly proportional to the square root of the spring constant and inversely proportional to the mass of the oscillating object.
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it is believed that troy has a high set point. dieting will be difficult for him because ____
If Troy has a high set point, it means that his body is predisposed to maintain a certain weight, which is difficult to change even with dieting and exercise.
Troy's high set point makes it difficult for him to lose weight through dieting because his body is biologically programmed to resist weight loss and maintain a stable weight.
The set point is the weight range that the body defends through various physiological mechanisms, including metabolic rate, hunger, and satiety signals.
When a person tries to lose weight through caloric restriction, their body responds by slowing down the metabolism and increasing hunger signals, making it harder to stick to the diet and maintain the weight loss.
This is why a focus on healthy habits and lifestyle changes, rather than quick-fix diets, is often recommended for sustainable weight management.
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multi-mode fiber is designed to operate at which of the following wavelengths?
850 and 1300 nm
860 and 1400 nm
870 and 1500 nm
880 and 1600 nm
Multi-mode fiber is designed to operate at 850 and 1300 nm wavelengths (Option A).
Multi-mode fiber is a type of optical fiber designed to carry multiple light rays or modes simultaneously, each at a marginally different reflection angle inside the optical fiber core.
Multi-mode fiber is mainly used to transmit across comparatively shorter distances, as the modes are more likely to disperse over longer extents. This phenomenon is known as modal dispersion. Another common type of optical fiber is the single-mode fiber, which is used mainly for longer distances. Multi-mode fiber is also known as multi-mode optical fiber.
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How are solar flares different from solar prominences.
Answer:
What is the difference between a prominence and a solar flare? A prominence is a loop of cool incandescent gas that extends above the photosphere. A solar flare is an explosive release of energy that comes from the sun and causes magnetic ditrubances.
Explanation:
Which thymocyte developmental checkpoint tests the functionality of the recombined beta chain of the pre-T cell
receptor (pre-TCR)?
10 pts
nts
Positive selection
Negative selection
Peripheral tolerance in spleen
Beta selection
The thymocyte developmental checkpoint that tests the functionality of the recombined beta chain of the pre-T cell receptor (pre-TCR) is called Beta selection.
During T cell development in the thymus, thymocytes undergo several checkpoints to ensure proper maturation and functionality. Beta selection is one such checkpoint that occurs at the double-negative stage of thymocyte development. At this stage, the recombined beta chain of the pre-TCR is tested for its functionality.
The pre-TCR, composed of the beta chain and a surrogate alpha chain, plays a crucial role in thymocyte development and selection. Beta selection specifically assesses the ability of the recombined beta chain to pair with the surrogate alpha chain and form a functional pre-TCR complex.
If the recombined beta chain is functional and capable of pairing with the surrogate alpha chain, signaling through the pre-TCR occurs, leading to positive selection. Positive selection allows thymocytes with functional pre-TCRs to survive and progress further in development.
On the other hand, if the recombined beta chain is non-functional or unable to properly pair with the surrogate alpha chain, signaling through the pre-TCR does not occur, resulting in negative selection. Thymocytes that fail the beta selection checkpoint are eliminated through apoptosis.
In summary, the beta selection checkpoint in thymocyte development is responsible for testing the functionality of the recombined beta chain of the pre-TCR. It determines whether thymocytes progress through positive selection or undergo negative selection based on the ability of the recombined beta chain to form a functional pre-TCR complex.
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The transfer of charge from clouds to the earth or cloud to cloud is called
That's called "lightning".
Answer:
The lightning itself is the transfer of charge from one region of a cloud to another or between the cloud and Earth. The narrow channel within which the flash of lightning occurs is heated suddenly to ~ 30,000 K, with essentially no time to expand.
Explanation:
Hope it helps
What is the momentum of a
ball that has a mass of 5kg and a velocity of 3.0m/s? *
Answer:
15 kg.m/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question we have
momentum = 5 × 3
We have the final answer as
15 kgm/sHope this helps you
a biologist keeps a specimen of his favorite beetle embedded in a cube of polystyrene plastic. the hapless bug appears to be 1.80 cm within the plastic. part a what is the beetle's actual distance beneath the surface? express your answer with the appropriate units.
The actual distance beneath the surface of the plastic cube where the beetle appears to be embedded is 1.80 cm.
When an object is observed through a transparent medium, such as the polystyrene plastic cube in this case, it appears to be at a different position than its actual location due to the phenomenon of refraction. The apparent position is determined by tracing the path of light rays as they pass through the medium. In this scenario, the beetle appears to be located 1.80 cm within the plastic cube. Therefore, the actual distance beneath the surface of the plastic, where the beetle is positioned, is indeed 1.80 cm.
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light energy with very high amplitude would be perceived as ________.
Answer:
Brightness.
Explanation:
very bright.
Light energy with very high amplitude would be perceived as very bright or intense light.
Waves with a big maximum displacement or height relate to light energy with a very high amplitude.
This large amplitude equates to a greater intensity or brightness of light in terms of perception.
When high-amplitude light waves enter our eyes, they excite light-sensitive cells, such as the cones in our retinas, more powerfully.
As a result of the increased stimulation, the sense of a bright or powerful light source is formed. The magnitude of the light's amplitude is interpreted by the human visual system as a measure of its intensity, allowing humans to distinguish between dimmer and brighter light sources.
Thus, in human visual experience, light energy with a very high amplitude is related with a heightened feeling of brightness or intensity.
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Can y’all help me with these two please, thank you
Explanation:
Question 4
Force is represented using letter F
the force formula f = ma
Question 5
mass = 0.43kg
acceleration = 49.4m/s²
Force = ?
Remember that force F = ma
Now substitute, F = 0.43 × 49.4 = 21.2N
HELP PLEASE! DUE TONIGHT! If the wind speed in the top figure increased, what would happen to the plane’s ground speed?
Answer: Flying into the wind provides more lift, but reduces the plane's “ground speed”, the speed of the plane relative to the ground hope this helps
Determine the launch speed of a horizontally launched projectile that lands 26.3m from the base of a 19.3m high cliff.
The launch velocity of the projectile is 13.28 m/s.
What is projectile motion?
The motion of an object thrown in the air under the force of gravity is known as projectile motion.
Since the object is launched horizontally, its initial velocity along the vertical direction is zero. From the second kinematic equation,
s=u*t+(1/2)at^2.
where s is the displacement, t is the time, u is the initial velocity and a is the acceleration. Since the height is decreasing, so it will be taken negative.
For the vertical motion, s=-19.3 m, a=-9.8 m/s^2 and u=0. Put the values in the above equation and solve it.
-19.3 = (0)*t+(1/2)*(-9.8)*t^2
19.3 = (1/2)*(9.8)*t^2
t=1.98 s
Since the velocity along the horizontal direction is constant, the displacement along the horizontal direction is given by the formula,
X=vt
where X is the horizontal displacement, v is the initial horizontal velocity and t is the time.
For the horizontal motion, X=26.3 m and t=1.98 s. Put the values in this equation and solve it.
26.3=v*(1.98)
v=13.28 m/s
The launch velocity is equal to the initial horizontal velocity, so it is equal to 13.28 m/s.
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If you and your friend are playing tug of war and both are you are pulling with the same amount of force. What will happen?
Answer:
Nothin will move, it will stay the same since no force is greater than the other. it's "the same amount of force" which also means an equal amount of force
Explanation:
The forces are only equal if there is no acceleration (which in the game of tug of war, accelerating yourself and your opponent is the idea). If the force on the rope and the ground are both equal either nothing moves or some other force is being applied in the system.
Hope this helped!
problem solving the united states has minted one-dollar silver coins called the american eagle silver bullion coin since 1986. each coin has a diameter of 40.6 millimeters and is 2.98 millimeters thick. the density of silver is 10.5 grams per cubic centimeter. what is the mass of an american eagle silver bullion coin to the nearest gram?
The mass of an American Eagle silver bullion coin is approximately 31 grams.
What is American Eagle silver bullion?
American Eagle Silver Bullion refers to a popular silver investment coin produced by the United States Mint. It was first introduced in 1986 as part of the American Eagle Bullion Program, which also includes gold and platinum coins. The American Eagle Silver Bullion coin contains one troy ounce of 99.9% pure silver and has a face value of one dollar.
To calculate the mass of the silver bullion coin, we need to find its volume and then multiply it by the density of silver. The volume of the coin can be calculated using its dimensions.
The coin has a diameter of 40.6 millimeters, which can be converted to centimeters by dividing by 10. Therefore, the diameter is 4.06 centimeters. The coin is 2.98 millimeters thick, which is equivalent to 0.298 centimeters.
The volume of a cylinder, which represents the coin, is given by the formula: volume = π × r² × h, where r is the radius and h is the height (or thickness) of the cylinder. The radius can be found by dividing the diameter by 2. So, the radius is 4.06 / 2 = 2.03 centimeters.
Using the values of radius (2.03 cm) and height (0.298 cm) in the volume formula, we can calculate the volume of the coin. Then, by multiplying the volume by the density of silver (10.5 grams per cubic centimeter), we can find the mass of the coin.
After performing the calculations, the mass of the American Eagle silver bullion coin is approximately 31 grams.
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A group of particles is traveling in a magnetic field of unknown magnitude and direction. You observe that a proton moving at 1.50 km>s in the x-direction experiences a force of 2.25 * 10-16 N in the y-direction, and an electron moving at 4.75 km>s in the -z-direction experiences a force of 8.50 * 10-16 N in the y-direction. (a) What are the magnitude and direction of the magnetic field
To determine the magnitude and direction of the magnetic field, we can use the formula for the magnetic force experienced by a charged particle in a magnetic field.
The magnetic force is given by the equation F = qvB sinθ, where F is the force, q is the charge of the particle, v is the velocity of the particle, B is the magnitude of the magnetic field, and θ is the angle between the velocity vector and the magnetic field vector.
For the proton, we have F = 2.25 * 10^-16 N, q = +1.6 * 10^-19 C, and v = 1.50 km/s. Since the force is in the y-direction, and the velocity is in the x-direction, the angle between the two vectors is 90 degrees. Plugging these values into the formula, we can solve for the magnitude of the magnetic field B.
For the electron, we have F = 8.50 * 10^-16 N, q = -1.6 * 10^-19 C, and v = 4.75 km/s. Again, since the force is in the y-direction and the velocity is in the z- direction, the angle between the two vectors is 90 degrees. Using the same formula, we can solve for the magnitude of the magnetic field B.
In this problem, we are given the forces experienced by a proton and an electron in a magnetic field. By applying the formula for the magnetic force and using the given values, we can determine the magnitude and direction of the magnetic field.
The force experienced by the proton is in the y-direction, which means the magnetic field must have a component in the y-direction. The angle between the velocity of the proton and the magnetic field is 90 degrees, as the velocity is in the x-direction. Using the formula F = qvB sinθ, we can solve for the magnitude of the magnetic field.
Similarly, the force experienced by the electron is also in the y-direction, indicating that the magnetic field has a component in the y-direction. The angle between the velocity of the electron and the magnetic field is 90 degrees, as the velocity is in the -z direction. Applying the formula, we can calculate the magnitude of the magnetic field.
By determining the magnitudes of the magnetic field from the forces experienced by both particles and considering the direction of the forces, we can fully describe the magnetic field in terms of its magnitude and direction.
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