Answer:
The amount of friction depends on the force pushing the surfaces together. If this force increases, the hills and valleys of the surfaces can come into closer contact. The close contact increases the friction between the surfaces. Objects that weigh less exert less downward force than objects that weigh more.
Explanation:
Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.
Mechanical engineers generally work in all of the following EXCEPT
•marine biology.
•aerospace products.
•automotive industry.
•computers and electronics.
Answer:
•marine biology.
Explanation:
A mechanical engineer is a professional individual who ensures the design of a mechanical assembly as well as the monitoring of its realization. His role involves the manufacturing of a prototype and developing new products for the company. Responsible for manufacturing, he advises the company and customers and assesses the risks and techniques used for its development. Finally, he supervises the installation and the market penetration of the product, as well as its maintenance.
A mechanical engineer can collaborate with many useful and complementary professions such as designers or marketers, it ensures the appearance and technical operation of the product. It is a job under high responsibility with projects that can be large.
Finally, he can also work in the construction sector, in the automotive industry, biomechanics, shipbuilding, aerospace production and aeronautics, railways, mechanics and metallurgy, robotics, textile machinery, etc.
An isotope has a half-life of 25 days. If you start with 50 grams, how much of the substance
will remain after 50 days? *
25 grams
12.5 g
6.75 g
Answer:
12.5
Explanation:
If the half life is 25 days then in 50 days it will half twice
50/2=25
25/2=12.5
Betty ran 5 km in 20 min. what is her speed in minutes?
There are 30 students in Ms. Andrews’ fourth grade class. There are 6 times as many students in the entire fourth grade as there are in Ms. Andrew’s class. Which equation can be used to determine the number of students, n, in the entire fourth grade? *
6 x n = 30
6 + 30 = n
30 x 6 = n
30 ÷ n = 6
Answer:
30×6=n
Explanation:
30 students in her class× 6 = number of students in the entire 4th grade.
Ifa truck starts from rest and it has acceleration of 4 m/s for 5 second
calculate its final velocity. What will be the distance travelled by the track
during the time interval?
Answer:
Distance 50m
final velocity 20ms^-1
[tex]s = ut + \frac{1}{2} a {t}^{2} \\ = 0 \times t + \frac{1}{2} \times 4 \times {5}^{2} = 50m[/tex]
[tex]v = u + at \\ v = 0 + 4 \times 5 \\ v = 20ms^{ - 1} [/tex]
The force experienced by an electron in a field between parallel plates is proportional to which of the following?
Select all that apply.
1. the distance between the plates
2. the inverse of the distance between the plates
3. the current in the circuit
4. the inverse of the potential between the plates
5. the potential difference between the plates
Answer:
2 and 5
Explanation:
Write a hypothesis about the effect of the red light on the population. Use the "if . . . then . . . because . . ." format, and be sure to answer the lesson question: "How does natural selection change the phenotypes within a population over time?"
.............they literally didn't talk about this in class.........
Answer:
yes because if red light was natural then it should cause more damage because that how it is
Answer:
its yes because if red light was natural then it should cause more damage because that how it is
10.0 points
When you drop a 0.38 kg apple, Earth exerts
a force on it that accelerates it at 9.8 m/s’ to-
Ward the earth's surface. According to New-
ton's third law, the apple must
exert an equal but opposite force on earth. If the mass of the Earth is 5.98 x 10^24 kg, what is the magnitude of the Earth’s acceleration towards the apple? Answer in units or m/s^2
Answer:
6.2 ×10^-25
Explanation:
Ma = mg
a = (m/M)g
[tex]a = \frac{0.38}{5.98 \times {10}^{24} } \times 9.8 = 6.2 \times {10}^{ - 25} [/tex]
3 A jet fighter has a mass at take-off of 28 000 kg.
a)Its engines produce a force of 70 000 N. What
is its acceleration?
b) What is its acceleration if the force from the
engine is increased to 120 000 N?
Answer:
A. 2.5 m/s²
B. 4.29 m/s²
Explanation:
A. Determination of the acceleration.
Mass (m) = 28000 Kg
Force (F) = 70000 N
Acceleration (a) =?
Force (F) is simply defined as the product of mass (m) and acceleration (a). Mathematically, it is expressed as:
Force (F) = mass (m) × acceleration (a)
F = ma
Divide both side by m
a = F / m
With the above formula, we can obtain the acceleration as follow:
Mass (m) = 28000 Kg
Force (F) = 70000 N
Acceleration (a) =?
a = F / m
a = 70000 /28000
a = 2.5 m/s²
B. Determination of the acceleration.
Mass (m) = 28000 Kg
Force (F) = 120000 N
Acceleration (a) =?
a = F / m
a = 120000 /28000
a = 4.29 m/s²
What is the net force acting on this cart ?
Explanation:
There is a force of 3N acting towards the left and 2 forces of 4N each acting towards the right.
Net force = (4N) + (4N) - (3N) = 5N towards the right.
P.S. We subtract the 3N force because the forces are in opposite directions.
Question 4 of 20 :
Select the best answer for the question.
4. What do wire junctions on a schematic without a dot mean?
A. It's main circuit wiring.
B. The wires don't touch.
C. The wires are connected.
D. The schematic isn't finished.
Mark for review (Will be highlighted on the review page)
Moyt Ouestion >>
Answer:
b
Explanation:
While swimming the elementary backstroke your eyes should be looking directly at..
Answer:
the ceiling
Explanation:
i dont know man but thats what my swimming instructor said, but i havent swam in like 3 years so ..
An oil tank has a base of area 2.5 m2 and is filled with oil to a depth of 1.2 m. The density of the
oil is 800 kg/m3. What is the force exerted on the base of the tank due to the oil?
A. 960N
B. 2400N
C. 9600N
D. 24 000N
Answer:
D. F = 24000[N]
Explanation:
To be able to calculate the force we must first find the pressure at the bottom of the tank. By means of the following equation:
[tex]P=Ro*g*h[/tex]
where:
Ro = density of the liquid = 800 [kg/m³]
g = gravity acceleration = 9.81 [m/s²]
h = elevation = 1.2 [m]
[tex]P=800*9.81*1.2\\P=9417.6[Pa][/tex]
Pressure is defined as the relationship between Force on the area.
[tex]P=F/A\\F=9417.6*2.5\\F = 23544 [N] = 24000[N][/tex]
Please show all the steps and work. The answer is -3.9 m/s2
Given that,
Initial velocity of the airplane = 66 m/s
Distance = 560 m
Final velocity of the airplane = 0 (stops)
To find,
Acceleration of the airplane.
Solution,
Let us consider that a is the acceleration of the airplane. We can find it using third equation of motion as follows :
[tex]v^2-u^2=2as\\\\a=\dfrac{v^2-u^2}{2s}\\\\a=\dfrac{0^2-66^2}{2(560)}\\\\a=-3.9\ m/s^2[/tex]
Therefore, the acceleration of the airplane is [tex]-3.9\ m/s^2[/tex]
(show work) WILL MARK BRAINLIEST!!
Which has a greater momentum, a 350kg car traveling at 20 m/s or a 400kg truck traveling at 17.5 m/s?
Answer: the formula for momentum is velocity times mass
car :
350 x 20 = 7000
truck:
400 x 17.5 = 3000
Ans : Car has a greater momentum
Explanation: Please mark Brainlest
Timed! i would really appreciate some help! will try to mark brainliest!!!
For her birthday, Samantha gets a new bike. She wants all her friends to see and so begins riding up and down her street. What is her speed if she goes 40.5m in 8.6s? *
4.71 m/s
4.71 h/m
47.1 h/m
Answer:
4.71m/s
Explanation:
Given parameters:
Distance covered = 40.5m
Time taken = 8.6s
Unknown:
Speed = ?
Solution:
The speed of Samantha is the distance divided by the time taken.
Speed = [tex]\frac{Distance}{time}[/tex]
Now insert the parameters;
Speed = [tex]\frac{40.5}{8.6}[/tex] = 4.71m/s
Dr. Suarez walks 2.8 km north to get to an observation post, then walks 5.1 km south back to her outpost. Determine her distance.
A.) 2.3 km, north
B.) 7.9 km, south
C.) 7.9 km
D.) 2.3 km
Answer:
C.) 7.9 km
Explanation:
Distance and Displacement
An object who constantly travels for some distances at defined periods of time has a total distance as 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 in its 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.
Dr. Suarez walks 2.8 km north and then 5.1 km south. The total distance is simply the sum of both distances: 2.8 km + 5.1 km = 7.9 km.
Note the distance does not have any direction (north or south), it's just the number.
Answer: C.) 7.9 km
These data tables show the distance of various galaxies from Earth in millions of light-years (Mly) at different times. Which table supports the theory of expansion in the formation of the universe?
Answer: it’s b
Explanation:
I had two attempts to do the test first I picked c but I did it again it’s b .
which roots are better underwater , taprroots or fibrous?
Answer:
The absorption of water and minerals by taproot is more efficient with the taproot system. Fibrous root absorbs water more efficiently as it reaches deep into the soil. Taproots are capable of withstanding drought.
A race car accelerates from 16.5 m/s to 45.1 m/s in 2.27 seconds. Determine the acceleration of the car.
O 12. 60 m/s2
O 5.9 m/s2
8.8 m/s2
O 10.8 m/s2
Answer:
12.6
Explanation:
An object is 45.0 kg here on Earth. What is its mass on Jupiter if the acceleration
due to gravity on Jupiter is 24.79 m/s 2?
A.) 1.82 kg
B.) 45.0 kg
C.) 1120 kg
D.) 441 kg
Answer:
B. 45.0 kg
Explanation:
On earth the object has ;
Mass = 45 kg
acceleration = 9.81 m/s²
On Jupiter, acceleration is 24.79 m/s²
The mass of this object on Jupiter will be 45 kg. It will not change. Mass of an object will only change when you remove part of the object from it or add to it another part. The mass is the same on Earth and on Jupiter. However, due to increased acceleration on Jupiter , the weight will change/ increase because;
Weight = mass * acceleration
On Earth
Weight of the object will be : 45 * 9.81 = 441.45 kg
On Jupiter
Weight of the object will be : 45*24.79 =1115.55 kg
A skydiver has a mass of 65 kg.
Calculate the weight of the skydiver.
Which 2 statements correctly describes the theory of plate tectonics?
Answer:
B and D
Explanation:
If it has letters.
A radium atom has 88 protons and 226 neutrons. How many electrons does it have?
Answer:
No. of electrons = 88
Explanation:
Given that,
No. of protons = 88
No. of neutrons = 226
We need to find the number of electrons it have in a radium atom.
In an atom, the number of protons is equal to the number of electrons. There are 88 protons in this case.
Hence, there are 88 electrons in the radium atom.
what is the power of television that transfers 6750J of energy every 45 seconds.
3. Why is a subducting plate boundary considered a type of
convergent plate boundary?
Answer:
✔ convergent
Explanation:
Answer:
B ( Convergent)
Explanation:
What is the difference between a mechanical wave and an electromagnetic wave?
A mechanical wave travels through empty space, while an electromagnetic wave travels through matter.
A mechanical wave has a short wavelength, while all electromagnetic waves have long wavelengths.
A mechanical wave has a high frequency, while all electromagnetic waves have low frequencies.
A mechanical wave travels through matter, while an electromagnetic wave travels through empty space.
its regular chooiseing just decide one and tell me
Answer: A a mechanical wave travels through empty space, while an electromagnetic wave travels through matter.
Explanation: A mechanical wave travels through empty space, while an electromagnetic wave travels through matter. A mechanical wave has a short wavelength, while all electromagnetic waves have long wavelengths.
Two boys, Shrijan having weight 600N and Shrijesh having weight
300N are playing see-saw. If Shrijan is sitting at 2m from fulcrum,
where should Shrijesh sit from fulcrum to balance Shrijan?
Answer:
to be balanced moments should be equal
4m
Explanation:
[tex]fd = fd \\ 600 \times 2 = 300 \times x \\ \frac{600 \times 2}{300} = x \\ 4m[/tex]
Answer:
4m
Explanation:
fd=fd
600×2× x
300
4m ans
find mass when kinetic energy is 1.6 J and velocity is 0.2 m/s
Answer:
4kg
Explanation:
Given parameters:
Kinetic energy = 1.6J
Velocity = 0.2m/s
Unknown:
Mass of the body = ?
Solution:
The kinetic energy of a body is the energy due to the motion of the body.
It is mathematically expressed as;
Kinetic energy = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
1.6 = [tex]\frac{1}{2}[/tex] x 0.2 x v²
1.6 = 0.1v²
v² = 16
v = 4kg
Hello boys and girls plz help me with this question ASAP
Thank you so much
Answer:
Blue
Explanation:
The colors of the rainbow are known by the acronym; ROYGBIV.
This is;
Red, Orange, Yellow, Green, Blue, Indigo, and Violet.
From research, their respective wavelengths on the average are;
Red: 665 nm
Orange; 630 nm
Yellow; 600 nm
Green; 550 nm
Blue; 470 nm
Indigo; from 445nm to 464 nm
Violet; less than 400 nm
This means that from Red to Violet in that order, wavelength is decreasing in a descending order.
Now in refraction, the light with shortest wavelength will be bent the most while that with longest wavelength will be bent the least.
Thus, violet bends the most.
However, violet is not included in the options. So the next one that will bend the most after violet among the options given is Blue.