Answer:
inertia of motionExplanation:
.... ...
What is the volume of a rock with a density of 45 g/mL and a mass of 855 g?
The volume of a rock with a density of 45 g/mL and a mass of 855g is 19mL.
The volume of the rock can be calculated as
[tex]density = \frac{mass}{volume}[/tex]
Density is the measurement of how tightly a material is packed
together.
by using the above formula of density we can find volume as
[tex]volume = \frac{mass}{density }[/tex]
v = m/ρ
where v = volume
m = mass
ρ = density
density of a rock = 45 g/mL
mass of rock = 855g.
The volume of the rock can be calculated as follows:
Volume = 855g /45g/mL
Volume = 19mL
Therefore, the volume of a rock with a density of 45 g/mL and a mass of 855g is 19mL.
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Help me please
For a velocity versus time graph how do you know what the velocity is at a certain
time? How do you know the acceleration at a certain time? How do you know the
Displacement at a certain time?
Answer:
For a velocity versus time graph how do you know what the velocity is at a certain time?
Ans: By drawing a line parallel to the y axis (Velocity axis) and perpendicular to the co-ordinate of the Time on the x axis (Time Axis). The point on the slope of the graph where this line intersects, will be the desired velocity at the certain time.
_____________________________________________________
How do you know the acceleration at a certain time?
[tex]Ans: We\ know\ that\ acceleration = \frac{Final\ velocity-Initial\ Velocity}{Time\ taken}[/tex]
Hence,
By dividing the difference of the Final and Initial Velocity by the Time Taken, we could find the acceleration.
_________________________________________________________
How do you know the Displacement at a certain time?
Ans: As Displacement equals to the area enclosed by the slope of the Velocity-Time Graph, By finding the area under the slope till the perpendicular at the desired time, we find the Displacement.
_________________________________________________________
A light ray passing from medium 1 to medium 2 is bent away from the perpendicular normal to the boundary surface. What happens to the velocity of the refracted wave as it enters medium 2?
The velocity increases.
The velocity decreases.
The velocity becomes zero.
The velocity does not change.
Answer:
The answer is a for Plato users.
Explanation:
Since the angle of the refracted ray moves away from the normal, it must be traveling in a faster medium.
Answer: Velocity Increases
Explanation: Plato
A student adds two vectors of magnitudes 48 m and 22 m. What are the maximum and minimum possible values for the resultant of these two vectors.
Answer:
Maximum=70 m
Minimum=26 m
Explanation:
Vector Addition
Since vectors have magnitude and direction, adding them takes into consideration not only the magnitudes but also their respective directions. Two vectors can be totally collaborative, i.e., point to the same direction, or be totally opposite. In the first case, the magnitude of the sum is at maximum. Otherwise, it's at a minimum.
Thus, the maximum magnitude of the sum is 48+22 = 70 m and the minimum magnitude of the sum is 48-22= 26 m
Two students (90.0 kg and 60.0 kg) on roller skates face-to-face push against each other. The 90.0 kg student moves at 5.0 m/s just after their hands lose contact. What is the velocity of the other student?
Given that,
Mass of student 1, m₁ = 90 kg
Mass of student 2, m₂ = 60 kg
Speed of student 1, v₁ = 5 m/s
To find,
The velocity of the other student.
Solution,
Using the conservation of momentum to find the velocity of the other student. Let it is v₂.
[tex]m_1v_1=m_2v_2\\\\v_2=\dfrac{m_1v_1}{m_2}\\\\v_2=\dfrac{90\times 5}{60}\\\\=7.5\ m/s[/tex]
So, the velocity of the other student is 7.5 m/s.
A car with an initial speed of 6.50 m/s accelerates at a uniform rate of 0.920 m/s2 for
3.60 s. Find the final velocity.
Answer:
v = 9.812 m/s
Explanation:
Given that,
The initia speed of a car, u = 6.5 m/s
Acceleration of the car, a = 0.92 m/s²
Time, t = 3.6 s
We need to find the final velocity of the car. Let the final velocity be v. Using equation of motion to find it as follows :
v = u +at
Putting all the values,
v = 6.5+(0.92)(3.6)
v = 9.812 m/s
So, the final velocity of the car is 9.812 m/s.
Convert 90 mph into meter seconds and feer seconds 1 mile equals 1600 m 1 m equals 3.3 feet one hour equals 3600 seconds
The speed of 90 mph converted into meter per seconds and feet per seconds is 40 m/s and 132 ft/s respectively.
Hw can the speed of 90 mph be converted into meter per seconds and feet per seconds?The speed of an object or body is the distance covered per unit time.
Speed = distance/timeThe given speed is in miles per hour.
To convert miles per hour to meter per second, the following steps are followed;
1 mile = 1600 m
90 miles = 90 * 1600 = 144000 m
1 hour = 3600 s
90 mph in m/s = 144000/3600
90 mph in m/s = 40 m/s
To convert meter per second to feet per second, the following steps are followed;
1 m = 3.3 ft
144000 m = 3.3 * 144000 = 475200 ft
1 hour = 3600 s
90 mph in ft/s = 475200/3600
90 mph in ft/s = 132 ft/s
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if a certain car, going with speed v1, rounds a level curve with a radius r1, it is just on the verge of skidding. if its speed is now doubled, the radius of the tightest curve on the same road that it can round without skidding is:
Answer:
The correct answer is 4R1
Explanation:
According to the given scenario ,the radius of the tightest curve on the same road without skidding is as follows:
As we know that
Centeripetal Acceleration is
= v^2 ÷ r
In the case when velocity becomes 2 times so the r would be 4 times
So, the radius of the tightest curve on the same road without skidding is 4R1
Starting at rest, A car accelerated to 20m/s in 4s. How far did the car travel as it sped up. Assume constant acceleration?
Answer:
40 m
Explanation:
displacement = 1/2 a t^2
= 1/2 ( 20/4) (4^2)
40 m
Girl runs 40m due south in 40 seconds,he then return to North,20m in 10 seconds,, calculate
1. average speed
2.average velocity
3.change in velocity
4.acceleration
A bicyclist was moving at a rate of 3 m/s, and then sped up to 4 m/s. If the cyclist has a mass of 100 kg, how much work was needed to increase his velocity? (Hint: Use the work-kinetic energy theorem.) O A. 1250 J B. 450 J O c. 350 j D. 800 J
Answer:
i got b but urs is a little different tell me if right
Explanation:
i go 100 on my test
Arvin, the ant, is on a picnic table. He travels 30 cm eastward, then 25 cm northward, and finally 15 cm westward. What is total distance traveled by Arvin?
Answer:
The total distance traveled by Arvin is 70 cm.
Explanation:
Distance and Displacement
A moving object constantly travels for some distance at defined periods of time. The total distance moved is the sum of each individual distance the object traveled. It can be written as:
dtotal=d1+d2+d3+...+dn
This sum is obtained independently of the direction the object moves.
The displacement only takes into consideration the initial and final points of the path defined by the object while it's moving. The displacement, unlike distance, is a vectorial magnitude and can be even zero if the object starts and ends the movement at the same point.
Arvin, the ant, moves 30 cm eastward, then 25 cm northward, and finally 15 cm westward. The total distance traveled is 30 cm+25 cm + 15 cm = 70 cm.
The total distance traveled by Arvin is 70 cm.
As the temperature of a blackbody increases, what happens to the peak wavelength of the light it radiates
Answer:
The peak wavelength of the light it irradiates decreases
Explanation:
As the temperature of a blackbody increase, the peak wavelength of the light it radiates decreases, this follows Wien's Law.
A blackbody is an ideal substance that emits all frequencies of light and also has the ability to absorb them as well.
Wiens displacement law, explains that the position of the peak wavelength of the thermal radiation emitted by bodies can change with temperature, and as the temperature increases beyond a certain point, the wavelength begins to reduce. This often changes the colour of the light emitted from heated objects.
Answer:
The peak wavelength increases.
Explanation:
I just took the test this is correct.
Forces that cancel each other are called_ forces \
Answer:
balanced forces
A delusion is best characterized as
Answer:
This is the most common form of delusional disorder. In this form, the affected person fears they are being stalked, spied upon, obstructed, poisoned, conspired against or harassed by other individuals or an organization.
Explanation:
hope this help
pick me as the brainliest
A series circuit has a 12-volt power source and two resistors of 1 ohm and 2 ohms respectively. How many amps will flow when
the circuit is closed?
Answer:
ayoooooooo
Explanation:
A 4-kg object is moving with a speed of 5 m/s at a height of 2 m. The kinetic
energy of the object is approximately _J.
Hello!
[tex]\large\boxed{KE = 50J}[/tex]
Use the formula for kinetic energy:
[tex]KE = \frac{1}{2}mv^{2}[/tex]
Plug in the given mass and velocity:
[tex]KE = \frac{1}{2} (4)5^{2}[/tex]
Simplify:
[tex]KE = \frac{1}{2} (100)\\\\KE = 50 J[/tex]
in both a dry cell and a wet cell battery, what causes the production of an electrical current.
a. chemical reaction

b.a step down substation transformer
c. magnets
d. generators at a power plant
Answer:
a. chemical reaction
Explanation:
In both a dry and wet cell battery, electric currents are produced through chemical reactions.
Both cells are together called electrochemical cells.
In these cells, chemical reactions produce an electric current. They are devices that converts chemical energy into electrical energyThe reactions here are spontaneous redox reactions. This causes the current to flow on their own in the circuit.You are testing a water heater design. One criterion is that the water heater heat water to a temperature of 180 °F. During testing, you find that the water in the water heater reaches a temperature of 200 °F. What would you do next?
Answer:
Explanation:
If the required max temperature needs to be 180 °F but the water temperature is hitting 200 °F then it is surpassing the desired temp and therefore failing to complete its purpose. Therefore, the next step would be to adjust the design and add a thermometer sensor to stop the water heater once the water temperature reaches the desired 180 °F. This would make the water heater serve its purpose as intended.
Four forces act upon a particle in the following manner: 50 N at 20° above the positive -
axis, 80 N at 40° to the left of the positive y-axis, 120 N at 35 below the negative
and 40 N at 25° to the right of the negative y-axis. Determine the magnitude and direction
of the resultant force.
axis
The magnitude of the resultant force is 89.88 N and the direction of the resultant force is 17.22°
We know that,
Vector of a force F = ( F cos θ, F sin θ )
Magnitude of a force F = √ ( x² + y² )
Angle of a force, θ = [tex]tan^{-1}[/tex] ( y / x )
Given that,
[tex]F_{1}[/tex] = 50 N, θ[tex]_{1}[/tex] = 20°
[tex]F_{2}[/tex] = 80 N, θ[tex]_{2}[/tex] = 130°
[tex]F_{3}[/tex] = 120 N, θ[tex]_{3}[/tex] = 215°
[tex]F_{4}[/tex] = 40 N, θ[tex]_{4}[/tex] = 295°
Vector of Resultant force, [tex]F_{R}[/tex] = ( [tex]F_{1}[/tex] cos θ[tex]_{1}[/tex], [tex]F_{1}[/tex] sin θ[tex]_{1}[/tex] ) + ( [tex]F_{2}[/tex] cos θ[tex]_{2}[/tex], [tex]F_{2}[/tex] sin θ[tex]_{2}[/tex] ) + ( [tex]F_{3}[/tex] cos θ[tex]_{3}[/tex], [tex]F_{3}[/tex] sin θ[tex]_{3}[/tex] ) + ( [tex]F_{4}[/tex] cos θ[tex]_{4}[/tex], [tex]F_{4}[/tex] sin θ[tex]_{4}[/tex] )
[tex]F_{R}[/tex] = ( 50 cos 20°, 50 sin 20° ) + ( 80 cos 130°, 80 sin 130° ) + ( 120 cos 215°, 120 sin 215° ) + ( 40 cos 295°, 40 sin 295° )
[tex]F_{R}[/tex] = ( - 85.83, - 26.69 )
Magnitude of Resultant force, [tex]F_{R}[/tex] = √ ( - 85.83 )² + ( - 26.69 )²
[tex]F_{R}[/tex] = √ 7366.79 + 712.36 = √ 8079.15
[tex]F_{R}[/tex] = 89.88 N
θ = [tex]tan^{-1}[/tex] ( - 26.69 / - 85.83 ) = [tex]tan^{-1}[/tex] ( 0.31 )
θ = 17.22°
Therefore,
Magnitude of the resultant force = 89.88 N Direction of the resultant force = 17.22°To know more about resultant forces
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What is the final velocity of an object that starts from rest and accelerates uniformly at 4
m/s2 over a distance of 8 m?
Answer:
8m/s
Explanation:
Given parameters:
Initial velocity = 0m/s
Acceleration = 4m/s²
Distance = 8m
Unknown:
Final velocity = ?
Solution:
To solve this problem, we use the right motion equation and find the unknown.
The right motion equation to solve this problem is given as :
v² = u² + 2aS
v is the final velocity
u is the initial velocity
a is the unknown acceleration
S is the distance
Now insert the parameters and solve;
v² = 0² + 2 (4) (8)
v² = 64
v = 8m/s
HELP I WILL GIVE BRAINLIEST!
In the EXPLORE section of your lesson 4.08 on Potential energy there were several animations to watch that provided a graphic illustrating how the PE and KE in a system changed as a skateboarder rides a halfpipe or a pendulum moves, why did the bar for the total energy remain constant?Question 1 options:
A. Energy is converted from kinetic to potential and potential to kinetic, but the total amount of energy is conserved
B. Because these models do not take into account the impact of friction and air resistance and are helping to solidify the concept of energy conservation and that the total mechanical energy remains constant in that model
C. all answers given are correct
D. This is because no energy is being created or destroyed in this system
Answer:
Answer:B
Explanation:
Because it all stayed consistant
What is the frequency of a pendulum that is moving at 30
m/s with a wavelength of 0.32 m?
Answer:
85.7Hz
Explanation:
v=f*λ
f = frequency
λ = wavelength
The frequency of the pendulum which is moving with a velocity of 30 m/s with a wavelength of 0.32 m is 93.75 Hz.
What is Frequency?The term frequency refers to the number of waves which are passing a fixed point in the unit time. Frequency also describes the number of cycles or the vibrations which are undergone during one unit of time through an object or a body in periodic motion. The SI unit of frequency is Hertz (Hz).
Wavelength = Velocity/ Frequency
Frequency = Velocity/ Wavelength
Frequency = 30/ 0.32
Frequency = 93.75 Hz
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Show that the force of gravity is 3.5 * 1022 N between Earth and the Sun
(Sun’s mass = 2.0 x 1030 kg; average Earth–Sun distance = 1.5 x 1011 m).
The force of gravity between the sun and the earth is determined as 3.54 x 10²² N.
What is force of gravity?This is the force of gravity is the force exerted between two objects in the universe.
According to Newton's law of universal gravitation, two bodies in space pull on each other with a force proportional to the product of their masses and the inversely proportional to the square of the distance between them.
F = Gm1m2/r²
where;
m1 is mass of the sunm2 is mass of the earthr is the distance between the two bodiesF = (6.67 x 10⁻¹¹ x 2 x 10³⁰ x 5.97 x 10²⁴) / (1.5 x 10¹¹)²
F = 3.54 x 10²² N
Thus, the force of gravity between the sun and the earth is determined as 3.54 x 10²² N.
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Energy Transformation
A car with a mass of 2000 kg is traveling down the highway at a constant 20 m/s. How much kinetic energy does it have?
100 J
50 J
400.000 J
40.000 J
Answer:
K =400000 J
Explanation:
Kinetic Energy
Is the energy an object has due to its state of motion. It's proportional to the square of the speed.
The equation for the kinetic energy is:
[tex]\displaystyle K=\frac{1}{2}mv^2[/tex]
Where:
m = mass of the object
v = speed at which the object moves
The kinetic energy is expressed in Joules (J)
The car has a mass of m=2000 Kg and travels at v=20 m/s. Calculating the kinetic energy:
[tex]\displaystyle K=\frac{1}{2}2000*20^2[/tex]
Calculating:
K =400000 J
What is a variable in an experiment?
Answer: anything that can change or be changed
Explanation: In other words, it is any factor that can be manipulated, controlled for, or measured in an experiment.
Answer:
Dependend variable or Independent variable
Explanation:
A variable is anything that can change or be changed. In other words, it is any factor that can be manipulated, controlled for, or measured in an experiment. Experiments contain different types of variables.
1. The distance between New York City and Dallas is about 1500 miles. Assume you drive to New York City at an average velocity of 80 miles per hour - how many hours will it take to reach New York City?
Answer: 22 hours 15 minutes
Explanation: The calculated flying distance from New York City to Dallas is equal to 1371 miles which is equal to 2206 km. If you want to go by car, the driving distance between New York City and Dallas is 2492.32 km. If you ride your car with an average speed of 112 kilometers/hour (70 miles/h), travel time will be 22 hours 15 minutes.
How much work is done on a 3.0 kg book that is pushed across the top of a table to the other side until it stops? Its initial speed is 1.4 m's.
Answer:
Work down = 2.94 N
Explanation:
Given:
Mass of book m = 3 kg
Initial speed v = 1.4 m/s
Find:
Work down w
Computation:
Work down = Kinetic energy
SO,
Work down = 1/2(m)(v)²
Work down = 1/2(3)(1.4)²
Work down = 2.94 N
Two small positively charged particles,whose combine charges give 4x10^-6C are situated in the air. If they repel each other by an electrostatic force of 1.0N when the particles are separated by 2.5m, determine the charge on the particle
(k=9x10^9N.M²C².)
Answer:
Down >3
Explanation:
Two small positively charged spheres have a combined charge of 5.0 × 10−5 C. If each sphere is repelled from the other by an electrostatic force of 1.0N Two small positively charged spheres have a combined charge of 5.0 × 10−5 C. If each sphere is repelled from the other by an electrostatic force of 1.0N
Which event is an example of condensation?
• A. A spilled drop of rubbing alcohol disappears.
O B. Fog forms in a valley.
• C. A puddle dries when exposed to the Sun.
D. A lake becomes a skating rink in the winter.
Correct answer B
Answer:
B. Fog forms in a valley.
Explanation: