Answer:
Time taken 4 hrs. 38 minutes
Explanation:
As speed = distance/time interval
So time taken = 4.38
speed=distance/time
we know the speed and we know the distance so we can calculate the time
120km/h=525km/time
time=525km/120km/h=4.375hours or 4 hours and 22 minutes and 30 seconds
A roller coaster car has 600,00 J of Kinetic energy as it approaches the station to stop. The roller coaster comes to a complete stop. How much work did the brakes do in stopping the car?
Answer:
Work Done by the Brakes = - 60000 J
Negative sign indicates the opposite direction of force and displacement.
Explanation:
Assuming that frictional effects are negligible, we can say that all the work done by the brakes is used to stop the car. We can apply law of conservation of energy to this situation as follows:
Work Done by the Brakes = Change in Kinetic Energy
Work Done by the Brakes = Final Kinetic Energy - Initial Kinetic Energy
Final Kinetic Energy of the roller coaster will be 0. Because, the roller coaster will stop finally and its velocity will become zero.
Work Done by the Brakes = 0 J - 60000 J
Work Done by the Brakes = - 60000 J
Negative sign indicates the opposite direction of force and displacement.
A student presses her palm by her thumb with a force of 75 N . What would be the pressure under her thumb having contact area is 1.5 cm2
Answer:
Pressure = 50 N/cm²
Explanation:
Given:
Force = 75 N
Area = 1.5 cm²
Find:
Pressure
Computation:
Pressure = Force / Area
Pressure = 75 / 1.5
Pressure = 50 N/cm²
If you push an 5 N object 2 m and then push a 10 N object 2 m. Which is TRUE?
You do the same amount of work.
You do more work when you move the 10 N object.
You are more powerful when you move the 5 N object
O You use the same amount of force.
Answer:
Explanation:
You don't do the same amount of work. The work formula is F*d = W
W = work
F = force
d = the distance moved.
So you do more work when you move the 10N object because the Force (F) has doubled.
Solve the following question and select the final answer:
The momentum of a bullet of mass 20kg fired from a gun is 10 kg m/s. The kinetic energy of this bullet in Kj will be:
a)5
b)1.5
c)2.5
d)25
Answer: 2.5
Explanation:
The mass of bullet = 20kg
The momentum of the bullet = 10kg m/s
The kinetic energy of this bullet in Kj will be calculated as:
= p² / 2m
= 10² /(2 × 20)
= (10 × 10) /(2 × 20)
= 100/40
= 2.5
Therefore, the correct option is C.
A football tube in the form of a sphere is inflated so that it radius increases in the ratio 4:3 . Find the ratio in which the volume is increased.
Answer:
The volume is increased in a ratio of 64/27
Explanation:
The Volume of a Sphere
The volume of a sphere of radius r is given by:
[tex]\displaystyle V=\frac{4}{3}\cdot \pi\cdot r^3[/tex]
If the radius was changed to r', the new volume would be:
[tex]\displaystyle V'=\frac{4}{3}\cdot \pi\cdot r'^3[/tex]
Dividing the latter equation by the first one:
[tex]\displaystyle \frac{V'}{V}=\frac{\frac{4}{3}\cdot \pi\cdot r'^3}{\frac{4}{3}\cdot \pi\cdot r^3}[/tex]
Simplifying:
[tex]\displaystyle \frac{V'}{V}=\frac{r'^3}{r^3}[/tex]
Or, equivalently:
[tex]\displaystyle \frac{V'}{V}=\left(\frac{r'}{r}\right)^3[/tex]
Since r':r = 4:3, thus:
[tex]\displaystyle \frac{V'}{V}=\left(\frac{4}{3}\right)^3[/tex]
[tex]\displaystyle \frac{V'}{V}=\frac{4^3}{3^3}[/tex]
[tex]\displaystyle \frac{V'}{V}=\frac{64}{27}[/tex]
The volume is increased in a ratio of 64/27
what is newton's third law of motion
Newton's Third Law of Motion states "To every action, there is an equal and opposite reaction; action and reaction forces act on different bodies".
A college student has decided to become a doctor and specialize in pulmonology. What is her next step, after completing an undergraduate degree?
residency
internship
specialized training
medical school
Answer:
D) Medical School
Explanation:
Edge 2021
the rubber covering over a wire acts as a / an ?
Answer:
Most electrical wire is covered in a rubber or plastic coating called insulation. The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.
Explanation:
What is the KE of a 6 kg mass at 4 m/s?
The KE of a 6 kg mass at 4 m/s will be 48 J. The kinetic energy is obtained, found as the product of mass and the square of the velocity.
What is Kinetic energy?The energy possessed by the body by the virtue of motion is known as the Kinetic energy. It is found as the product of mass and the square of the velocity.
The given data in the problem is;
The mass is, m=6 kg
The velocity is,v= 4 m/s
The kinetic energy is found as;
[tex]\rm KE = \frac{1}{2}mv^2 \\\\\ \rm KE = \frac{1}{2}6 (4) ^2\\\\\ KE= 48 \ J[/tex]
Hence, the KE of a 6 kg mass at 4 m/s will be 48 J.
To learn more about the kinetic energy, refer to the link;
https://brainly.com/question/12669551
#SPJ2
What does the Nucleolus do?
A) Makes ribosomes
B) Controls the nucleus
C) Controls the cell
D) Creates cytoplasm and lipids
Answer:
C
Explanation:
Answer:
A) Makes ribosomes
Explanation:
The nucleolus assembles the ribosomes of a cell, which are then sent to the cytoplasm to be used.
Pls help me with my work
A balloon drifts 14 km at an angle of 30º to the ground. What is the vertical component of the balloon
Sin is the vertical component. So multiply sin 30 and 14. BOOM! You got the answer.
[tex] \sin(30) \times 14 \: = 7[/tex]
what is measurnment
Answer:
measurement is the comparison of unknown physical physical quantity with know standard quantity of the same kind .
for a given force, if the mass of the object is doubled, its acceleration becomes ??
Force = Mass . Accelaration
f=ma
force is directly proportional to mass and accelaration
therefore when mass of the object is doubled, the accelaration would be halved
since
a=f/m
Help!!
Which is the most common source of ocean oil pollution?
A.oil spills
B.street runoff
C.offshore drilling
D.ship repairs
Answer:
Oil Spills.
Explanation:
Answer:
C
Explanation:
HELP ASAPP!!!! WILL GIVE BRAINLIEST!
Describe the chemical structure of a cell membrane
Answer:
The plasma membrane is composed of a bilayer of phospholipids, with their hydrophobic, fatty acid tails in contact with each other. ... Carbohydrates are attached to some of the proteins and lipids on the outward-facing surface of the membrane. These form complexes that function to identify the cell to other cells.
Explanation:
Hope it answered you plz mark as Brainlist
Which of the following is the most important factor in determining an element’s place in the periodic table?
A. Number of protons
B. Number of neutrons
C. Atomic Charge
D. Atomic Density
Explain how the shape of a river's stream bed can affect the river's speed and its power to cause erosion.
Answer:
Possiable answer by edge:
The shape of a river’s stream bed affects the speed and eroding power of a river by influencing the amount of friction between the water flowing through the river and the stream bed below. Friction is the force that opposes the motion of one surface as it moves across another surface. In a river, there is friction between the flowing water and the stream bed beneath it. Where a river is deep, less water comes into contact with the stream bed, so there is less friction. The reduced friction means there is less opposition to the water’s motion, so the river flows at a greater speed and has more kinetic energy for erosion. On the other hand, where a river is shallow, more water comes into contact with the stream bed, so there is more friction. The increased friction means there is more opposition to the water’s motion, so the river flows at a lesser speed and has less kinetic energy for erosion. Also, the roughness of a stream bed covered with boulders and other obstacles causes the water to flow through the river in a turbulent fashion. This could cause the river to move slower in some cases or erode more in other cases.
Explanation:
summary of answer:
influencing the amount of friction between the water flowing through the river and the stream bed below.
food and electricity are the examples of_________________
Answer:
sources of energy
Answer:
energy
Explanation:
hope this is the right answer
need ASAP WILL MARK BRANLIEST
Answer:
pls refer to attachments
If a Ferrari, with an initial velocity of 10 m/s, accelerates at a rate of 5 m/s2 for 3 seconds, what will its final velocity be?
Answer:
25 m/s
Explanation:
Formula of acceleration is:
[tex]a=\frac{v-u}{t} \\[/tex]
where,
v is the final velocity
u is the initial velocity
a is the acceleration and
t is the time
so plugging in the values we get,
[tex]a=\frac{v-u}{t} \\\\5=\frac{v-10}{3} \\\\15=v-10\\15+10=v\\v=25\ m/s\\[/tex]
A wheelchair ramp is 5.2 m long and 0.8 m high. Calculate the ramp’s mechanical advantage
Answer:
5
Explanation:
62
When a piece of iron or mass 78 gm is put in a graduated cylinder containing 100 cm cube of water the reading of the cylinder become 110cm cube
Calculate the density of iron.
Answer:
Ro = 7.8 [g/cm³]
Explanation:
According to the principle of Archimedes, the volume of a body immersed in a liquid is equal to the volume displaced by water. That is, in this problem The displacement volume is equal to the new volume minus the original volume.
[tex]V_{n}=110[cm^{3} ]\\V_{o}=100[cm^{3} ]\\V_{d}=110-100 = 10 [cm^{3} ][/tex]
We now know that density is defined as the relationship between mass and volume.
[tex]Ro = m/V_{d}[/tex]
where:
Ro = density [g/cm³]
m = mass = 78 [g]
Vd = displacement volume [cm³]
[tex]Ro = 78/10\\Ro = 7.8 [g/cm^{3} ][/tex]
Which of the following BEST describes Jupiter's seasons?
O A.
There are no significant seasonal changes.
B.
The seasons are much like Earth's.
OC.
The seasons are much shorter than Earth's.
OD. The seasons are much longer than Earth's.
Answer:
Jupiter does not have changing seasons like the Earth, but instead is believed to have a constantly stormy atmosphere. This is partly due to its tilt, which is only 3 degrees. The planet has a very turbulent atmosphere and is believed to have a lot of long-term storms.
So the answer is A : There are no significant seasonal changes.
Explanation:
Which of the following is an example of velocity?
O a. 2 m/s
O b. 25 N
O c. 55 miles per hour South
O d. 2m/s2 west
Answer:
C
Explanation:
b is 55 miles per hour south or 55mph[South]
the important part to understand is that velocity is a vector meaning it also has to have a direction, in this case south. That is why a (2m/s) is not a velocity, however 2m/s is a speed.
Anyone....................
Answer:
h₁ = 18 [cm]
Explanation:
This problem can be solved by applying the principles of the static pressure of a liquid column. The key to the solution is to know that the pressure on the horizontal line should be equal for both liquids, this must be met regardless of their density.
[tex]P_{2}=P_{1}\\[/tex]
where:
P₂ = Pressure exerted by the liquid 2 in the given point L₂
P₁ = Pressure exerted by the liquid 2 in the given point L₁
Now we can calculate the pressure in each point using the following expression:
[tex]P_{1}=Ro_{1}*g*h_{1}\\P_{2}=Ro_{2}*g*h_{2}[/tex]
Where:
Ro₁ = density of the liquid 1 = 0.8 [g/cm³]
Ro₂ = density of the liquid 2 = 1.8 [g/cm³]
g = gravity acceleration = 9.81 [m/s²]
h₁ = column of the liquid 1 [m]
h₂ = column of the liquid 2, = 8 [cm] = 0.08 [m]
But first we must convert the units from grams per cubic centimeter to kilograms per cubic meter.
[tex]0.8[\frac{g}{cm^{3}}]*[\frac{1kg}{1000g} ]*[\frac{100^{3}cm^{3} }{1m^{3} } ]=800[kg/m^{3} ]\\1.8[\frac{g}{cm^{3}}]*[\frac{1kg}{1000g} ]*[\frac{100^{3}cm^{3} }{1m^{3} } ]=1800[kg/m^{3} ][/tex]
Now replacing in the first equation:
[tex]800*9.81*h_{1}=1800*9.81*0.08\\h_{1}=\frac{1800}{800} *0.08\\h_{1}=0.18 [m] = 18 [cm][/tex]
Answer:
[tex]h_1 = 18 \: cm[/tex]
Explanation:
See image for explanation
I hope my working is correct.
SAT QUESTION // A capacitor is connected to a variable power supply with potential V. Determine the effect on the charge stored on the capacitor if the potential of the power supply is cut in half.
Answer:
decrease by a factor of 2
A cyclist travels 100 kilometers in 4 hours. What is the cyclist speed?
Answer:
100x4=400 kilometers
Explanation:
: )
Answer:
100÷4=25
Explanation:
you would devide
Which best describes reflection and refraction?
In both reflection and refraction, rays pass through a boundary.
In both reflection and refraction, rays bounce off a boundary.
In reflection, rays bounce off a boundary, and in refraction, rays pass through a boundary.
In refraction, rays bounce off a boundary, and in reflection, rays pass through a boundary.
Answer:
The correct answer is the third option
Explanation:
To reflect means to bounce off. When an incoming ray (called incident ray) gets to a boundary and bounces off the boundary, that is referred to as reflection. However, when an incident ray passes through the boundary and it causes a change in the direction of propagation of the wave, that is referred to as refraction. Thus, the correct option, as explained above, is; In reflection, rays bounce off a boundary, and in refraction, rays pass through a boundary.
Answer:
c
Explanation:
on edge 2020
Give the Concept of heat and temperature on the basis of molecular motion. Please give long answer
Explanation:
Molecular motion is defined as the movement of constituent particles or molecules in a certain direction. The molecular motions are affected by heat and temperature. This is because the temperature is the measurement of the average kinetic energy of the molecules and represents the motion of molecules.
Answer:
Heat and temperate are directly related As the temperature increases then the heat inside of the tube or container also increase. When a liquid is at a sub-cooled liquid temperature and increases then the molecules begin to move faster and fill up more space or volume. Hence as temperature increases then the molecules kinetic energy increases and activity in terms of molecules significantly increases.