what is the definition of density? the measure of mass of a material within a given space. the measure of mass of a material within a given space., defragment, the volume of an object. the volume of an object., defragment, the weight of an object the weight of an object, defragment, the mass of an object.
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the definition of density is: the measure of mass of a material within a given space
The density of an object is the relation that exist between the mass and the space that the object occupies. The general formula of the density is:
ρ = m/v
Where:
v= volumeρ= densitym= massFor example if we want to know which is the density of a body that has a mass of 100g and a volume of 150 cm³, applying the density formula we get:
ρ = 100 g/150 cm³
ρ = 0.666 g/cm³
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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Related Questions
How does an inclined plane increase force?
Answers
Acceleration will increase as the angle of incline does, and as a result, force will as well.
The gravitational force acting on the cart increases as the slope of the incline increases, causing it to accelerate more quickly.The ramp's steepness will cause an increase in inclination. As a result, the acceleration increases as the inclination angle increases. This acceleration causes the object to descend with greater speed.
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The ways to measure the mass and volume of irregular object
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Answer:
When we have irregular objects, it may become very hard to calculate the volume of the object, as we actually can not use any simple equation to find it.
The mass is less tricky, just find a scale and wheight it, now we know the mass of the irregular object.
One way to measure the volume of the object is using water... how we do it?
Get some recipient with water, measure the height of the water.
Introduce your object into the water and totally submerge it, now the level of the water will rise. This is because as you introduce the object under the water, you are displacing up a given volume of water that has the same volume as the irregular object.
Now that you know the height of the water before and after you put your object, you can easily calculate the volume of water displaced, and that will be the volume of the object (the tricky part may be totally submerging the object if, for example, is wood and it floats, here you can use a thin wire to push it down but it will affect a little bit the measures.)
Your bone structure, metabolism and body fat distribution all contribute to your ______ A.Body type B. Height C. Energy levels D. Exercise habits
Answers
Answer:
Maybe [A]
Explanation:
electrons in a photoelectric-effect experiment emerge from a copper surface with a maximum kinetic energy of 1.10 ev . part a what is the wavelength of the light? express your answer in nanometers.
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The wavelength of the light in the photoelectric-effect experiment is 1126.72 nanometers.
The maximum kinetic energy of the electrons in the photoelectric-effect experiment is given by the equation KE = hf - Φ, where KE is the maximum kinetic energy of the electrons, h is Planck's constant, f is the frequency of the light, and Φ is the work function of the copper surface.
Since the maximum kinetic energy is given as 1.10 eV, we can convert it to joules using the conversion factor 1 eV = 1.602 x 10^-19 J. Thus, 1.10 eV = 1.77 x 10^-19 J.
We can then rearrange the equation KE = hf - Φ to solve for the frequency of the light, which is given by f = (KE + Φ) / h. The work function of copper is typically around 4.7 eV, so we can convert it to joules as well to get Φ = 7.55 x 10^-19 J.
Substituting the values we have, we get f = (1.77 x 10^-19 J + 7.55 x 10^-19 J) / (6.626 x 10^-34 J s) = 3.17 x 10^15 Hz.
Finally, we can use the equation c = λf, where c is the speed of light and λ is the wavelength of the light, to solve for the wavelength. The speed of light is approximately 3.00 x 10^8 m/s, so we can convert it to nanometers by multiplying by 10^-9.
Substituting the values we have, we get λ = c / f = (3.00 x 10^8 m/s) / (3.17 x 10^15 Hz) = 94.4 nm. Therefore, the wavelength of the light in the photoelectric-effect experiment is 1126.72 nanometers.
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Mass of the sun is 2x10³⁰ kg and that of the earth is 6/10²⁴ kg and the distance between them is 1.5 x 10¹¹m. What is the gravitational force produced between them?
Answers
Answer:
The gravitational force is 3.56 × 10^22 N
Explanation:
\({ \bf{force = \frac{GM_{s} m _{e}}{ {r}^{2} } }}\)
\({ \sf{force = \frac{6.67 \times {10}^{ - 11} \times (2 \times {10}^{30} ) \times (6\times {10}^{24}) }{(1.5 \times {10}^{11}) {}^{2} } }} \\ \\ { \sf{force = 3.56 \times {10}^{22} \: newtons}}\)
Chemical reactions provide support for the law of conservation of matter because which of the following is true about the atoms of the reactants and products in a chemical reaction?
Answers
Answer:
Explanatioit cn:
A clock which has brass pendulum beats seconds correctly when the temperature of the room is 30° C. how many seconds will it gain or lose per day when the temperature of the room falls to 10° C?
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Answer:A::C
Solution :
ΔT=
1
2
TαΔθ
rArr Δt=
ΔT
T1t
But T′≈T
∴Δt=
1
2
αΔθ(t)
=
1
2
×0.000012×20×24×3600
=10.37s
At higher temperture, length of pendulum clock will be more. So, time period will be more and it will lose the time.
Explanation:
EASY but I still need help lol
Answers
according to our textbook, roughly what percent of the mass and energy contents of the universe is made up of dark matter plus dark energy?
Answers
It turns out that dark energy makes up about 68% of the universe.About 27% of matter is dark matter.Less than 5% of the universe is made up of everything else, including everything that has ever been observed by all of our sensors and all regular matter.
How much dark matter makes up the entire universe? It turns out that dark energy makes up about 68% of the universe.About 27% of matter is dark matter.Less than 5% of the universe is made up of everything else, including everything that has ever been observed by all of our sensors and all regular matter.Dark matter, which makes up about 27% of the cosmos, appears to outnumber visible matter by a factor of nearly six to one.A sobering fact is this:Only 5% of the universe is made up of the known matter, which is what gives rise to all of the stars and galaxies.According to the most recent calculations, the universe is composed of 73% dark energy, 23% dark matter, and 4% normal baryonic matter.To learn more about dark energy refer
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a bike accelerates at 2m/s2 down the street when a force of 12 newtons is applied to it. what is the mass of the bike
Answers
Answer:
6 kilograms
Explanation:
force (N) = mass (kg) × acceleration (m/s²). an object of constant mass accelerates in proportion to the force applied. If the same force is applied to two objects of different mass, the heavier object has less acceleration than the lighter object. Divide the newtons by the rate of acceleration, which will give you the mass of the object. The mass will be in kilograms, because a single newton represents the amount of force needed to move one kilogram one meter.
on a horizontal frictionless air table, a puck runs into an ideal horizontal spring that is fastened to the table. the puck compresses the spring by 15 cm before coming to rest. during the compression process, which quantities are conserved?
Answers
Only the puck's mechanical energy (kinetic plus potential) is kept in tact.
The energy an object has when moving or the energy it retains owing to its location is referred to as mechanical energy, also known as kinetic energy or potential energy. Mechanical energy is another source of renewable energy. Many renewable energy sources rely on mechanical energy to efficiently create electricity or convert energy.
The short answer to what mechanical energy is ?Mechanical energy is created by combining kinetic and potential energy. It is the force that controls the position and movement of an object. A compressed spring, for instance, has mechanical energy in the form of potential energy, while a moving vehicle has mechanical energy in the form of kinetic energy.
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Identifying Obstacles
Since the purpose of these strategies is to help overcome obstacles and set-backs in your exercise routine, take a minute and think about the most obvious obstacle you have. If you do not have any obstacles at the present time, think about a potential obstacle to your exercise that could occur.
Answers
Answer:
Thx!
Explanation:
If a car is traveling 100 km/h west and comes to a stop in 3 min, what is the car's acceleration? Need procedure.
Answers
Answer:
a = 0.154 [m/s^2]
Explanation:
To solve this problem we must use the following formula of kinematics.
\(v_{f}= v_{i}-(a*t)\\\)
where:
Vf = final velocity = 0
Vi = initial velocity = 100 [km/h]
t = time = 3 [min] = 180 [s]
Now we need to convert the velocity from [km/h] to [m/s]
\(100[\frac{km}{h} ]*1000[\frac{m}{1km} ]*1[\frac{h}{3600s} ]=27.77[\frac{m}{s} ]\)
0 = 27.77 - (a*180)
a = 0.154 [m/s^2]
Note: the negative sign of the equation shows, that the car slows down until it stops
I tried to solve this, not sure what I did wrong, nor what the question is actually asking for
Answers
In cartesian coordinates, we can write the position vectors as-
a) → r = 12.4 m , θ = 170° ↔ - 12.21 i + 2.15 j
b) → r = 4 cm , θ = 50° ↔ 2.57 i + 3.06 j
c) → r = 20 inches , θ = 210° ↔ - 17.32 i - 10 j
What are polar coordinates?It is two-dimensional coordinate system which uses a straight line distance (from a reference point) and the angle made by it (with respect to reference direction) to represent a point in the X-Y plane.
Given are the position vectors in polar coordinates of three points in X-Y coordinate system.
The transformation from polar coordinates (r, θ) into cartesian coordinates (x, y) is done using the following formulae -
x = r cosθ
y = r sinθ
a) → r = 12.4 m , θ = 170°
x = 12.4 x cos (170°) = 12.4 x -0.98480775301 = -12 .21
y = 12.4 x sin (170°) = 12.4 x 0.17364817766 = 2.15
In cartesian form → ( -12.21 i + 2.15 j )
b) → r = 4 cm , θ = 50°
x = 4 x cos (50°) = 4 x 0.64278760968 = 2.57
y = 4 x sin (170°) = 4 x 0.76604444311 = 3.06
In cartesian form → ( 2.57 i + 3.06 j )
c) → r = 20 inches , θ = 210°
x = 20 x cos (210°) = 20 x -0.86602540378 = -17.32
y = 20 x sin (210°) = 20 x -0.5= -10
In cartesian form → ( -17.32 i - 10 j )
Therefore, in cartesian coordinates, we can write the position vectors as -
a) → r = 12.4 m , θ = 170° ↔ - 12.21 i + 2.15 j
b) → r = 4 cm , θ = 50° ↔ 2.57 i + 3.06 j
c) → r = 20 inches , θ = 210° ↔ - 17.32 i - 10 j
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Determine the force that the jaws j of the metal cutters exert on the smooth cable c if 100-n forces are applied to the handles. The jaws are pinned at e and a, and d and b. There is also a pin at f.
Answers
To determine the force that the jaws j of the metal cutters exert on the smooth cable c, we need to consider the equilibrium of forces. Given that 100 N forces are applied to the handles, we can assume that these forces are balanced.
The jaws j are pinned at e and a, and d and b. There is also a pin at f. Since the cable is smooth, there is no friction force acting on it. Therefore, the force exerted by the jaws on the cable would be equal to and opposite to the sum of the 100 N forces applied to the handles.
In other words, the force exerted by the jaws j on the smooth cable c would also be 100 N.
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When a body changes we know that its momentum changes.
Answers
Answer:
ok
Explanation:
Answer:
The change of movement depends on the force that acts and the length of time it acts.
L AB= CB= ZA= Use trigonometry with each of the following problems. DO NOT USE THE PYTHAGOREAN THEOREM! Show all work. Round to the nearest whole number. 2. 34 11 39° B B AC= CB= ZA= 23"
Answers
By using trigonometry, we found that side AC is approximately 14" and side BC is approximately 18" in the given triangle.
To solve the given problem using trigonometry without using the Pythagorean theorem, we can utilize the properties of right triangles and trigonometric ratios. Let's solve the problem step by step:
1. Given: AB = CB = ZA = 23"
2. Draw the triangle ABC, where angle B is 39 degrees and sides AB, CB, and AC are equal to 23".
3. We can use the sine function to find the length of side AC. The sine of an angle in a right triangle is defined as the ratio of the length of the side opposite the angle to the length of the hypotenuse.
Using the sine function:
sin(B) = opposite/hypotenuse
sin(39°) = AC/23"
Rearranging the equation to solve for AC:
AC = sin(39°) * 23"
Calculating the value:
AC ≈ 0.6293 * 23" ≈ 14.4839 ≈ 14"
Therefore, the length of side AC is approximately 14".
4. Next, let's find the length of side BC using the cosine function. The cosine of an angle in a right triangle is defined as the ratio of the length of the side adjacent to the angle to the length of the hypotenuse.
Using the cosine function:
cos(B) = adjacent/hypotenuse
cos(39°) = BC/23"
Rearranging the equation to solve for BC:
BC = cos(39°) * 23"
Calculating the value:
BC ≈ 0.7696 * 23" ≈ 17.7098 ≈ 18"
Therefore, the length of side BC is approximately 18".
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Determine the stopping distance for a car traveling at 16 m/s for an acceleration of -4m/s^2
Answers
The distance d traveled by an object under uniformly accelerated motion while it changes its speed from v_o to v_f with an acceleration a is given by the formula:
\(d=\frac{v^2_f-v^2_0}{2a}\)Since the car travels initially at 16m/s and it stops, then v_0=16m/s and v_f=0. Replace those values into the formula, as well as a=-4m/s^2 to find the stopping distance for the car:
\(d=\frac{(0)^2-(16\frac{m}{s})^2}{2(-4\frac{m}{s^2})}=\frac{-256\frac{m^2}{s^2}}{-8\frac{m}{s^2}}=32m\)Therefore, the stopping distance for the car is 32 meters.
9. A constant velocity means acceleration is
(a.) positive
(b.) negative
(c.) increasing
(d.) zero
Answers
Answer:
d. zero
Explanation:
Constant velocity means the acceleration is zero. In this case the velocity does not change,
hope this helps you
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A truck driver sees a dog running into the road. He immediately brakes. Describe the energy transfers in the truck as it comes to a stop.
Answers
Answer: find the answer in the explanation.
Explanation:
Before the truck driver sees a dog running into the road, The mechanical energy state of the truck will be kinetic energy at maximum.
Immediately he applied the brakes, the mechanical energy of the truck will be combination of kinetic energy and potential energy.
The kinetic energy will gradually decrease as potential energy continue to increase till it reaches maximum potential energy.
The truck will come to a stop at maximum potential energy
The two high and two low tides experienced by a point on Earth's surface, as it rotates through the water bulges created by inertia and gravity, result in a
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The occurrence of two high tides and two low tides at a specific location on Earth's surface, caused by the gravitational pull and inertia creating water bulges, forms a daily cycle referred to as the tidal cycle.
The gravitational pull of the moon is the primary cause of tides on Earth's surface. The moon's gravitational force creates two tidal bulges on opposite sides of the Earth, causing a water bulge to appear on both the side of the Earth nearest and the farthest from the moon.
This creates two high tides and two low tides per day.The tidal cycle, which is caused by the Earth's rotation beneath the water bulges, takes roughly 24 hours and 50 minutes to complete.
The tidal range, or the difference between the high and low tide, can vary depending on several factors, including the moon's position relative to the Earth and the geography of the coastline.
Tides are essential for a variety of reasons, including maintaining the ocean's health, influencing the weather, and regulating coastal ecosystems.
The energy derived from tides can also be utilized for the production of electricity.Tides have a significant impact on shipping, fishing, and other coastal activities, and understanding tides is essential for navigating the ocean safely.
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Find the tension in the two ropes that are holding the 2.9 kg object in place. Rope 1 makes an angle of 51.3° with respect to the vertical. Rope 2 is pulling horizontally.
Answers
Answer:
Explanation:
Let the tension in horizontal rope be T₁ and in the other rope be T₂ which is making angle of 51.3⁰
The vertical component of tension T₂ will balance the weight .
= T₂ cos 51.3 = 2.9 x 9.8
T₂ = 2.9 x 9.8 / cos 51.3
= 28.42 / .625
= 45.47 N
The horizontal component of T₂ will balance T₁
T₂ sin 51.3 = T₁
45.47 sin 51.3 = T₁
T₁ = 35.48 N .
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Which statement is true of a distance-time graph?
A.) A line with a curve indicates that the object has a constant speed.
B.) The line in the graph points downward if the object is speeding up.
C.) The line shows a change in speed if its angle changes.
D.) The line shows the path of the object that is moving.
Answers
Answer: c) The line shows a change in speed if its angle changes.
I'm not sure
Explanation:
What are 5 sentences describing how a soccer ball sitting still illustrates Newton's First Law?
Answers
A ball sitting still on the pitch obeys Newton's first law.
What is the first law of Newton?According to the first law of the Newton, a body would continue to be at rest or in state of uniform motion unless it is acted upon by an external force.
In this case, we have a football that is sitting still on a pitch. This ball is held by the force of inertia and the forces that act on it are balanced. If on the other hand this ball is not kicked (action of eternal force), it would continue to sit still on the pitch.
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the motion(s) that occur at the radioulnar joint?
Answers
The radioulnar joint is a synovial joint located at the elbow that connects the radius and the ulna, enabling rotational motion.
The radioulnar joint allows for pronation and supination. Pronation refers to the motion of rotating the forearm so that the palm faces downwards, while supination refers to the motion of rotating the forearm so that the palm faces upwards. The radioulnar joint allows the radius and ulna to move relative to each other, resulting in rotational motion.
When the forearm is pronated, the radius rotates over the ulna and crosses it, while the ulna remains stationary. When the forearm is supinated, the radius rotates back to its original position, and the two bones are parallel to each other.The radioulnar joint is important in many activities, including writing, typing, playing musical instruments, and sports like tennis and golf. Any damage to this joint can result in a loss of pronation and supination, making daily activities challenging.
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How are light waves produced
Answers
Answer:
Electromagnetic waves are created by oscillating charges (which radiate whenever accelerated) and have the same frequency as the oscillation. Since the electric and magnetic fields in most electromagnetic waves are perpendicular to the direction in which the wave moves, it is ordinarily a transverse wave
Explanation:
Answer:
Electromagnetic waves are created by oscillating charges (which radiate whenever accelerated) and have the same frequency as the oscillation. Since the electric and magnetic fields in most electromagnetic waves are perpendicular to the direction in which the wave moves, it is ordinarily a transverse wave
Explanation:
What is 120 °F in °C ?
Answers
Answer:
What is 120 °F in °C ?
48.8889
120°F is equal to 48.9°C. To convert the temperature from Fahrenheit (°F) to Celsius (°C), we use the formula : °C = (°F - 32) * 5/9
How is °F converted to °C?Fahrenheit to Celsius formula represents the conversion of degree Fahrenheit to degree Celsius and the formula for Fahrenheit to Celsius is as °C = [(°F-32)×5]/9.
To convert temperature from Fahrenheit (°F) to Celsius (°C), we can use this formula: °C = (°F - 32) * 5/9
Given 120 °F:
Now, °C = (120 - 32) * 5/9
°C = 88 * 5/9
So, °C = 48.9 °C
Hence, 120 °F is approximately equal to 48.9 °C.
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What are brown bears doing as a result of panting?
maintaining internal water levels by releasing moisture
maintaining internal water levels by taking in moisture
maintaining body temperature by warming up
maintaining body temperature by cooling down
Answers
They are maintaining their body temperature by cooling down, like dogs do, as they don't have enough sweat glands to keep them cool without panting.
Brown bears maintain body temperature by cooling as a result of panting. So, the correct option is D.
What is Body temperature?Normal human body-temperature is defined as the typical temperature range found in humans which is commonly referred to as 36.5–37.5 °C. The human body temperature varies. Temperature is known as the degree of hotness or coldness of an area or object.
When we are very hot, the blood vessels of the skin dilate to carry the excess heat to the surface of the skin. Brown bear panting ensures that cool air circulates over the moist surfaces in the mouth which helps maintain body temperature by cooling the body.
Therefore, the correct option is D.
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A rod 7.0 m long is pivoted at a point 2.0 m from the left end. A downward force of 50 N acts at the left end, and a downward force of 200 N acts at the right end. At what distance to the right of the pivot can a third force of 300 N acting upward be placed to produce rotational equilibrium?
Answers
If the rod is in rotational equilibrium, then the net torques acting on it is zero:
∑ τ = 0
Let's give the system a counterclockwise orientation, so that forces that would cause the rod to rotate counterclockwise act in the positive direction. Compute the magnitudes of each torque:
• at the left end,
τ = + (50 N) (2.0 m) = 100 N•m
• at the right end,
τ = - (200 N) (5.0 m) = - 1000 N•m
• at a point a distance d to the right of the pivot point,
τ = + (300 N) d
Then
∑ τ = 100 N•m - 1000 N•m + (300 N) d = 0
⇒ (300 N) d = 1100 N•m
⇒ d ≈ 3.7 m
what is an echo?
give me an short answer
Answers
Answer:
Echo..... when the sound reflects back