Why does a block of metal sink in water but the same size block of wood floats
Answer:
The molecules in the metal are closer than the molecules of the wood. The metal is more compact.
Explanation:
Density is characteristic property of the substance. Density is the relationship between the mass of the substance with the volume. Metallic bonds are collectively formed It hold molecule together and is high in density. Whereas the wood has molecules which are dispersed.
This makes the metals sink in water than the same size wood. Molecules which are bind together are directly correlated with density, which is high. Metal has high density than wood.
An exoplanet has four times the mass and one-fourth the radius of the earth. find the acceleration due to gravity on its surface, in terms of g, the acceleration of gravity at earth's surface.
The acceleration due to gravity on the surface of the exoplanet is 16 times the acceleration of gravity on Earth's surface.
Explanation:To find the acceleration due to gravity on the surface of the exoplanet, we can use the information that it has four times the mass and one-fourth the radius of the Earth. Gravitational force is directly proportional to mass and inversely proportional to the square of the radius. Since the mass is four times greater and the radius is one-fourth, the gravitational force would be (4/1)^2 = 16 times stronger. Therefore, the acceleration due to gravity on the surface of the exoplanet would be 16 times the acceleration of gravity on Earth's surface, or 16g.
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A softball is fouled off with a vertical velocity of 20 m/s and a horizontal velocity of 15 m/s. what is the resultant velocity of the ball
The resultant velocity of the softball fouled off with vertical and horizontal components of 20 m/s and 15 m/s, respectively, is 25 m/s, calculated using the Pythagorean theorem.
To calculate the resultant velocity of a softball that is fouled off with a vertical velocity of 20 m/s and a horizontal velocity of 15 m/s, we can use the Pythagorean theorem. The resultant velocity (Vr) is the vector sum of the vertical (Vy) and horizontal (Vx) components of velocity.
The formula for the resultant velocity is given by:
[tex]Vr = \/(Vx^2 + Vy^2)[/tex]
Plugging in the values we have:
[tex]Vr =\/(15 m/s)^2 + (20 m/s)^2Vr = \/(225 + 400) m/sVr = \/625 m/sVr = 25 m/s[/tex]
Therefore, the resultant velocity of the softball is 25 m/s.
Two balls are thrown straight up. the first ball is thrown with twice the initial speed of the second. ignore air resistance. how much higher will the first ball rise?]
Moving a distal part of arms or legs to follow a circular path is:
What is the wavelength of a radio photon from an "am" radio station that broadcasts at 1280 kilohertz?
The number of electromagnetic waves that travel past a certain point in a given time is the ________ of the radiation.
The number of electromagnetic waves that pass a certain point in a given time is the frequency of the radiation. Electromagnetic waves are characterized by their wavelength, frequency, and amplitude. Frequency is the number of complete wave cycles that pass a specific point in a set time, measured in Hertz.
Explanation:The number of electromagnetic waves that travel past a certain point in a given time is the frequency of the radiation. To describe it in more detail, electromagnetic waves are depicted by their wavelength, frequency, and amplitude. For instance, when looking at a wave, the wavelength is the distance between two consecutive peaks or troughs.
Conversely, the frequency is the number of these complete wave cycles that pass a specific point in a designated period. It can be expressed in cycles per second, or Hertz (Hz). And lastly, the amplitude refers to the magnitude of the wave's displacement, i.e., half the height between the wave's peaks and troughs which is associated with the light's intensity or brightness for sound it refers to loudness.
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A driver must _______ for a school bus that is stopped with its red lights flashing on the opposite side of the road.
0.403 L is equal to:
4.03 mL
40.3 mL
403 mL
4,030 mL
Answer:
0.403 mL = 403 L
Explanation:
In this question, it is required to convert 0.403 litres to millilitres. We know that the conversion from L to mL is as follows :
1 litre = 1000 millilitres
For converting 0.403 L to ml we need to use above relation.
0.403 L is equal to 0.403 multiplied by 1000 so that we get 403 mL.
So, the correct option is (c) ''403 mL''. Hence, this is the required solution.
A student arranged the four cards sequentially in a row on the basis of the periods when these events occurred. The card showing the earliest event was placed on the extreme left. Which of these cards was placed third in the row?
On a spring break vacation you decide to visit the grand canyon near flagstaff, arizona. then you head south to visit some friends in phoenix, arizona. while on the drive you notice that the temperature is increasing along the route. how do you explain this?
A container full of mercury weighs 1000g. the empty container weighs 320 g. the density of the mercury is 13.6 g? cm3. what is the volume of the box ?
Choose if the quantity indicated is a vector or a scalar. Quantity: the number of coins in a piggy bank Type of quantity:
Scalars and vectors are different types of physical quantities, with scalars having only magnitude while vectors have magnitude and direction.
Scalars are physical quantities that have only a number value or magnitude, whereas vectors require both magnitude and direction. The number of coins in a piggy bank is a scalar quantity because it only represents the amount without any directional information.
what most likley happens to the air at the beach at night
What is the wavelength of a proton traveling at a speed of 6.21 km/s? what would be the region of the spectrum for electromagnetic radiation of this wavelength?
The wavelength of the given proton is approximately 6.01 * 10⁻¹⁴ m, and this fits into the gamma rays region of the electromagnetic spectrum. The electromagnetic spectrum ranges from gamma rays to radio waves and the proton's wavelength indicates it being of higher energy.
Explanation:The wavelength of a proton can be found using the de Broglie wavelength formula:
λ = h / (m*v),
where h is Planck's constant 6.63 * 10⁻³⁴ J*s, m is the mass of the proton and v is its speed. So first convert the speed of the proton from km/s to m/s: 6.21 km/s * 1000 = 6210 m/s.
Then substitute into the formula:
λ = 6.63 * 10⁻³⁴ J*s / (1.67 * 10⁻²⁷ kg * 6210 m/s).
After the calculation, we find that the wavelength of the proton is approximately 6.01 * 10⁻¹⁴ m.
Now, we analyze the region of the electromagnetic spectrum for electromagnetic radiation of this wavelength.
The electromagnetic spectrum ranges from gamma rays (with wavelengths shorter than 10^-11 m) to radio waves (with wavelengths longer than 10⁻¹ m).
The calculated wavelength of the proton, 6.01 * 10⁻¹⁴ m, falls into the gamma rays region of the electromagnetic spectrum and inclines towards the higher energy end.
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The wavelength of a proton traveling at 6.21 km/s, is approximately 6.37 x 10⁻¹¹ meters, The region of the spectrum for electromagnetic radiation of this wavelength is X-ray region of the spectrum.
To find the wavelength of a proton traveling at a speed of 6.21 km/s, we use the de Broglie wavelength formula:
λ = h / (m × v)
where:
λ is the wavelength,h is Planck's constant (6.626 x 10⁻³⁴ J·s),m is the mass of the proton (1.673 x 10⁻²⁷ kg), andv is the speed of the proton (6.21 km/s or 6210 m/s).First, substitute the given values into the formula:
λ = 6.626 x 10⁻³⁴ J·s / (1.673 x 10⁻²⁷ kg x 6210 m/s)
Next, calculate the denominator:
1.673 x 10⁻²⁷ kg x 6210 m/s = 1.039833 x 10⁻²³ kg·m/s
Then divide Planck's constant by this product:
λ = 6.626 x 10⁻³⁴ J·s / 1.039833 x 10⁻²³ kg·m/s ≈ 6.37 x 10⁻¹¹ meters
Region of the Spectrum
This calculated wavelength corresponds to approximately 6.37 x 10⁻¹¹ meters, which places it in the X-ray region of the electromagnetic spectrum.
What is one difference between water and ice?
Select the statement that best describes gravity.
Gravity is the force that draws objects closer to the Earth because of the positive or negative charge.
Gravity is the force of attraction between two objects; it is dependent upon the mass of the objects and the distance between the objects.
Gravity is the force that repels two objects of similar charges; it is dependent on the number of charged particles in the objects.
Gravity is the force of attraction between objects of similar weight; it is not a strong force when objects are close to each other.
Explanation:
Gravity is the force of attraction between two objects. It depends upon the mass of the objects and the distance between the objects. Mathematically, the force of gravity is given by :
[tex]F=G\dfrac{m_1m_2}{d^2}[/tex]
Where
G is the universal gravitational constant
[tex]m_1\ and\ m_2[/tex] are masses
d is the distance between two masses
So, statement (2) describes gravity "Gravity is the force of attraction between two objects; it is dependent upon the mass of the objects and the distance between the objects".
What is the effect on current through a circuit of steady resistance when the voltage is doubled?
The earths gravity pulls on the moon and keeps it in orbit. The moon's gravity _____.
a) doesn't affect anything
b) pulls back on earth
c) pushes the moon away from the earth
d) can only pull on smaller objects such as asteroids but has no effect on the earth
The earths gravity pulls on the moon and keeps it in orbit. The moon's gravity b) pulls back on earth
What is gravity ?The force that attracts a body towards the center of the earth, or towards any other physical body having mass is called gravity .
Due to gravity , a gravitation force exists because of which bodies attract each other . Gravitational force is an attractive force that exists between all objects with mass; an object with mass attracts another object with mass; the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects.
Since both earth and moon have mass , the earths gravity pulls on the moon and keeps it in orbit and the moon's gravity pulls back on earth by their gravitation force of attraction and because of gravity
hence, correct option is b) pulls back on earth
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How can 2 objects have the same temperature but different amount of thermal energy?
An object is raised above the ground gaining a certain amount of potential energy. if the same object is raised twice as high, it gains:
If the same object is raised twice as high, it gains: double the potential energy.
Potential energy (P.E) can be defined as a type of energy possessed by an object (body) as a result of its position (height) above the earth. Thus, potential energy (P.E) is highly dependent on the height above the ground.
Mathematically, potential energy (P.E) is calculated by using the following formula:
[tex]Potential \;energy (P.E) = mgh[/tex]
Where:
m is the mass of object.g is the acceleration due to gravity.h is the height of an object.Since the height of the object is raised twice as high, it simply means the value of height (h) would be multiplied by two (2) and the potential energy (P.E) would double:
[tex]Height = 2[/tex] × [tex]height[/tex]
[tex]P.E = 2(mgh)[/tex]
In conclusion, raising the same object is raised twice as high, would cause the potential energy (P.E) to double (twice as much as the initial value).
At a given instant in time, a 6-kg rock that has been dropped from a high cliff experiences a force of air resistance of 15 n. what are the magnitude and direction of the acceleration of the rock? (do not forget the gravitational force!) round the final answer to two decimal places.
The magnitude of the acceleration of the rock is 7.3 m/s² downward.
Explanation:The rock experiences two forces at this given instant: the force of gravity and the force of air resistance. The force of gravity is equal to the weight of the rock, which is given by the equation Fg = mg, where m is the mass of the rock (6 kg) and g is the acceleration due to gravity (9.8 m/s²). Therefore, Fg = 6 kg × 9.8 m/s² = 58.8 N. The force of air resistance is given as 15 N.
To find the net force acting on the rock, we subtract the force of air resistance from the force of gravity: Fnet = Fg - Fair = 58.8 N - 15 N = 43.8 N.
The magnitude of the acceleration of the rock can be found using Newton's second law, which states that the net force on an object is equal to the mass of the object multiplied by its acceleration. Therefore, a = Fnet / m = 43.8 N / 6 kg = 7.3 m/s².
The direction of the acceleration is downward, which is the same as the direction of the force of gravity.
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The force of gravity is an inverse square law. this means that, if you double the distance between two large masses, the gravitational force between them __________.
If you double the distance between two large masses, the gravitational force between them decreases by a factor of four.
The law of inverse squares states that the gravitational force is inversely proportional to the square of the separation between the masses. The relationship can be described mathematically as follows:
F ∝ 1 / [tex]r^2[/tex]
where r is the distance between the masses and F is the gravitational force.
The inverse square connection causes the force to decrease to one-fourth of its initial magnitude when the distance (r) is doubled.
Thus, in other words, when the space between the masses is doubled, the gravitational force is reduced by a factor of 4.
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What does Kelpers first law of planetary motion imply?
The volume of a ball was measured at 500.0 cm3, and then mass was measured on this triple beam balance. what would be the most accurate reading for the mass of the ball? g using this mass, what would be the most accurate calculation of density for the ball? g/cm3
We have that the mass and density are
[tex]m=404.2 g[/tex]
[tex]\rho=0.8084g/cm^3[/tex]
From the Question we are told that
The volume of a ball was measured at 500.0 cm3,
We have that if we are to measure a volume of 500cm^3 we have
mass [tex]m=404.2 g[/tex]
to find Density
[tex]\rho=\frac{m}{v}\\\\\rho=\frac{404.2}{500}[/tex]
[tex]\rho=0.8084g/cm^3[/tex]
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The maximum power output of an engine is usually given in units called
Final answer:
Engine power output is typically measured in horsepower (hp), where 1 hp equals 746 watts (W). The watt is the SI unit for power, defined as 1 joule per second.
Explanation:
The maximum power output of an engine is commonly expressed in a unit known as horsepower (hp). The International System of Units (SI) for power is the watt (W), where 1 W is defined as 1 joule per second (1 J/s). However, in many applications, especially when referring to engines, power is frequently stated in horsepower. To convert horsepower to watts, recall the equivalence that 1 hp equals 746 W.
For instance, the power output of an engine might be specified as 100 hp, which translates to approximately 74.6 kilowatts (kW), since 1 kW equals to 1,000 watts.
Describe 4 common workplace practices that are risk factors for injury
to move a heavy object, like a refrigerator which one of the following would not help to decrease the friction force?
Answer:
Use more force to push the refrigerator with the help of a friend
Explanation:
Argon, neon, and xenon are examples of
A. Halogens
B.metalloids
C. noble gases
D. alikia metals
Answer:B
Explanation:
in human activities how long would carbon stay as fossil fuels