what is machine
and type of machine
Answer:
A machine is a mechanical structure that uses power to apply forces and control movement to perform an intended action.
Explanation:
Example: Elevator
In descriptive scientific investigations, scientists often make observations to understand the interacting parts of a complex .
Answer:
system
Explanation:
I js took the test
A small metal sphere has a mass of 0.19 gg and a charge of -23.0 nCnC. It is 10.0 cmcm directly above an identical sphere that has the same charge. This lower sphere is fixed and cannot move. If the upper sphere is released, it will begin to fall.What is the magnitude of its initial acceleration?
Answer:
a = -7.29 m / s²
Explanation:
For this exercise we must use Newton's second law,
F -W = m a
Force is electrical force
F = k q₁ q₂ / r²
k q₁ q₂ / r² -mg = m a
indicate that the charge of the two spheres is equal
q₁ = q₂ = q
a = (k q² / r² - m g) / m
a = k q² / m r² - g
Let's reduce the magnitudes to the SI system
m = 0.19 g (1kg / 1000 g) = 1.9 10⁻⁴ kg
q1 = q2 = q = -23.0 nC (1C / 10⁹ nC) = -23.0 10⁻⁹ C
r = 10.0 cm (1m / 100cm) = 0.1000 m
let's calculate
a = 9 10⁹ (23.0 10⁻⁹)² / (0.1000² 1.9 10⁻⁴) - 9.8
a = -7.29 m / s²
The negative sign indicates that the direction of this acceleration is downward
Question 3 (1 point)
Which of the following is a vector quantity?
a) 16.5 seconds
b) 18.5 m/s west
c) 25 m/s
d) 12 meters
Answer:
B) 18.5 m/
s west
Explanation:
Scalar quantity has MAGNITUDE only
Vector quantity has MAGNITUDE and DIRECTION
Hope this is correct and helpful
HAVE A GOOD DAY!
HELP PLZ "25 meters per second Northeast" is a description of
Speed
Acceleration
Velocity
Direction
Answer:
ion no
Explanation:
cuz i dont
Answer:
It is the SPEED of an object.
Explanation:
Why is a thermos considered a (mostly) closed system?
thermoses come in different shapes and sizes
different types of liquids
stayhot
matter and energy cannot enter or leave the system when the thermos lid is on
tightly
different types of hot or cold items can be stored in a thermos
Answer:
The answer is C. Matter and energy cannot enter or leave the system when the thermos lid is on tightly.
Hope this helps
Thermos considered a closed system as matter and energy cannot enter or leave the system when the thermos lid is on tightly. The correct option is C.
What is a physical system?Any artifact or part of an object that can be evaluated using physics laws is referred to as a physical system.
Physical systems include atoms and bodies of water. The environment is everything outside the system, and it is overlooked in the assessment except for its impacts on the system.
A physical system is a combination of parts or elements that exhibit behavior that the constituents do not. Physical systems are made up of matter and energy.
In physics, chemistry, or engineering, a closed system is a purely natural system that does not permit the transmission of matter into or out of the system, but does allow the transfer of energy.
Thus, C is the correct answer.
For more details regarding a physical system, visit:
https://brainly.com/question/11114957
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we do not use water instead of mercury in a barometer
Answer:
Mercury is commonly used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure.
Which scientist created the most modern classification that we use today
Answer:
A. Aristotle
Explanation:
Answer:
A: Aristotle
Explanation:
There is no explanation
A boat sailed 7 hours at speed of 80km/h
Answer:
No it’s 1,130
Explanation:
I did online
john can travel to atlanta 560 miles in 9 hours what is his velocity
Answer:
132
Explanation:
How long does it take a car to cross a 20m bridge if it starts from rest and accelerates at 5 m/s^2?
2s
1.89s
1.41s
1.41 m
2.8s
The correct answer is 2.8s
A hummingbird beats it’s wings up and down 60 times a second what is the frequency and period
Answer:
Period = 0.0167 seconds
Frequency = 60 Hz
Explanation:
Period: This can be defined as the time take by a wave to complete on cycle. The S.I unit is (s)
Frequency: This is the number of cycle completed by a wave. The S.I unit is (Hz)
From the question,
T = t/n................................... Equation 1
Where T = period, t = time take to complete n oscillation, n = number of oscillation.
Given: t = 1 seconds, n = 60.
Substitute these values into equation 1
T = 1/60
T = 0.0167 seconds.
Also,
F = 1/T........................... Equation 2
Where F = frequency
Given: T = 0.0167 seconds,
Substitute these value into equation 2
F = 1/0.0167
F = 60 Hz
Under what circumstances does distance traveled equal magnitude of displacement? What is the only case in which magnitude of displacement and distance are exactly the same?
Answer: Please find the answer in the explanation
Explanation:
Under what circumstances does distance traveled equal magnitude of displacement?
When a body's motion is linear in one direction. Or a body moving in a straight line without turning back.
What is the only case in which magnitude of displacement and distance are exactly the same?
When the body is moving in a straight line with without changing direction or without turning back.
The model below shows a calcium atom. An image has a mix of red and blue balls in its center and 4 concentric black rings around the center. The first ring from the center has 2 small green balls on it. The second ring has 8 small green balls on it. The third ring has 8 small green balls on it. The outermost ring has 2 small green balls on it. How many electrons are in the third energy level?
Answer:
8 electrons in the third energy level
Explanation:
From the description,the third energy level has 8 electron (represented by the small green balls you describe)
Answer:
8
Explanation:
I gotcha fam
An ant can travel approximately 30 meters per minute. How many meters could an ant move in 45 minutes.
Answer:
From what I see, it's saying that every minute, the ant can move 30 meters. So how many meter would it move in 45 minutes?
30 meters = 1 min
x meters = 45 min
1 min x 45 = 45 min
30 meters x 45 = 1,350 meters
So, I believe the answer would be 1,350 meters.
hope this helps. :>
A test car carrying a crash test dummy accelerates from 0 to 30 m/s and then crashes into a brick wall. Describe the direction of the initial acceleration vector and compare the initial acceleration vector’s magnitude with respect to the acceleration magnitude at the moment of the crash. [*** DRAW A DIAGRAM ***]
Answer:
the direction of acceleration of the vehicle is the same direction of its velocity of car
s acceleration has the opposite direction to the car speed.
Explanation:
The initial acceleration of the car can be calculated with
v = v₀ + a t
a = (v-v₀) t
indicate that the initial velocity is zero (v₀ = 0 m / s)
a = v / t
a = 300 / t
the direction of acceleration of the vehicle is the same direction of its acceleration movement.
When the car collides with the wall, it exerts a force in the opposite direction that stops the vehicle, therefore this acceleration has the opposite direction to the car speed. But your module must be much larger since the distance traveled to stop is small
exlpain the process of harvesting
Answer:
harvesting is a proscess of gathering a ripe crop from the fileds
Explanation:
A freely suspended magnet does not point exactly at the geographical N-S direction
A person holding a lunch bag is moving upward in a hot air balloon at a constant speed of 7.7 m/s . When the balloon is 21 m above the ground, she accidentally releases the bag. Part A What is the speed of the bag just before it reaches the ground
Answer:
The speed of the bag just before it reaches the ground is 21.71 m/s.
Explanation:
The speed of the bag can be found using the following equation:
[tex] v_{f}^{2} = v_{0}^{2} - 2gy [/tex]
Where:
[tex]v_{f}[/tex] is the final speed =?
[tex]v_{0}[/tex] is the initial speed = 7.7 m/s
g: is the gravity = 9.81 m/s²
y: is the height = 21 m
[tex]v_{f}^{2} = v_{0}^{2} - 2gy = (7.7 m/s)^{2} - 2*9.81 m/s^{2}*(-21 m) = 471.31 m^{2}/s^{2}[/tex]
[tex]v_{f} = 21.71 m/s[/tex]
Therefore, the speed of the bag just before it reaches the ground is 21.71 m/s.
I hope it helps you!
Tor F
Science and technology
are
mutually beneficial.
Answer:
I believe that it's True.
NET FORCE ( PLEASE ANSWER ASAP )
First picture (black background): 50 Newtons UP
Second picture (white background): 30 Newtons RIGHT
3. A bus accelerates at 25 m/s/s. This allows the bus to speed up from 16 m/s to 172 m/s. How long
did this take?
9.18 seconds
-9.18 seconds
-6.24 seconds
6.24 seconds
Answer:
time taken will be 6.24sec.
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who is the winner of khatron khiladi made in india 2020
Answer:
karishma tanna
Explanation:
it is correct
Karishma Tanna was declared as the winner.
Which of the following element has seven total valence electrons? Your answer: argon helium oxygen bromine
Answer:
bromine
Explanation:
Any element in the halogen group will have seven valence electrons. These elements include fluorine, chlorine, bromine, iodine, and astatine
The classification and collection of data that are in the form of numbers is called
Answer:
Statistics
Explanation:
Using the equation E = mc2, calculate how many joules of energy would be produced by converting 6.8 × 10-6 kg of matter into energy in this fusion reaction. Use c = 3 × 108 m/s.
Answer:
Explanation:
Using the formula : E = mc²
Where m = mass = 6.8 × 10^-6 kg
c = speed of light = 3 ×10^8 m/s
The amount of joules of energy that would be produced equals :
Plugging in our values :
E = mc²
E = (6.8 × 10^-6) kg × (3 ×10^8)²m/s
E = (6.8 × 10^-6) kg × 9 × 10^16 m/s
E = 61.2 × 10^(-6 + 16)
E = 61.2 × 10^10 J
Answer:
E = 6.12 × 1011 kg × m2/s2
Explanation:
which scenario is an example of a scientific way of thinking?
Answer:
A example of a scientific way of thinking is making observations, forming questions, making hypotheses, doing an experiment, analyzing the data, and forming a conclusion.
Besides the USA what is another country that does not use the metrio system?
Answer:
The USA, Liberia, and Myanmar (Burma) are the only countries that do not use the metric system
an electric heater takes 4 A when operated on 250 V supply. calculate the cost of the electricity consumed at 10k per kWh when the heater is used for 4 hours
Answer:
P=IV.
P=4×250=1000.
(1000/1000)kw×4.
1×4=4×10=40k.
HEY CAN ANYONE PLS HELP ME IN DIS! Which prefix represents a unit that is larger than "centi-" ? a. "nano-" b. "pico-" c. "milli-" d. "deci-" e. "micro-"