Answer:(B) 25.0 N
Explanation:
This is what makes most since. You are wanting to look at the stress of the first wire. 25 *3 for the amount of balls handing of the string you get 75.0 N which is the max the top wire can hold without breaking! Hope this helps!
The speed of
a bus rs 72km/hr. Convert it into
si system dimensionally
Answer:
Speed = 20 m/s
Explanation:
The speed of a bus is 72 km/h
The SI unit of speed is m/s
We need to convert it into m/s
We know that,
1 km = 1000 m
1 h = 3600 s
It means,
[tex]s=72\ \dfrac{km}{h}\\\\=\dfrac{72\times 1000\ m}{3600\ s}\\\\=20\ m/s[/tex]
So, the speed of the bus is 20 m/s.
how can we calculate the e.m.f of the battery?.
Explanation:
The emf is equal to the work done on the charge per unit charge (ϵ=dWdq) when there is no current flowing. Since the unit for work is the joule and the unit for charge is the coulomb, the unit for emf is the volt (1V=1J/C).
Answer:
The EMF or electromotive force is the energy supplied by a battery or a cell per coulomb (Q) of charge passing through it. The magnitude of emf is equal to V (potential difference) across the cell terminals when there is no current flowing through the circuit. (byjus)
Explanation:
None of these are examples of projectile motion except: (Click all that
Apply)
A) Shooting a Basketball
B) Throwing a Baseball
C) Shooting a Cannon
D) Shooting a Gun
E) Writing a Pencil
F) Rolling a Bowling Ball
How are mass and acceleration related (if you change one of them, what happens to the other one)?
The kinetic energy of an object depends upon its _____ *
2 points
A. mass and resiliency
B. elasticity and weight
C. speed and mass
D. speed and distance
Why is a skeptical attitude important in science?
A. It allows scientists to challenge inaccurate information.
B. It allows scientists to accept all information as true.
C. It ensures that scientists write short articles.
D. It highlights the good features of an experiment.
E. It provokes other scientists.
Answer:
A: It allows scientists to challenge inaccurate information.
Explanation:
In a 350-m race, runner A starts from rest and accelerates at 1.6 m/s^2 for the first 30 m and then runs at constant speed. Runner B starts from rest and accelerates at 2.0 m/s^2 for the first 30 m and then runs at constant speed. Runner A befins running as soon as the race begins but B first takes a nap to rest up. What is the longest nap that B can take and still not lose the race?
Answer:
B can take 0.64 sec for the longest nap .
Explanation:
Given that,
Total distance = 350 m
Acceleration of A = 1.6 m/s²
Distance = 30 m
Acceleration of B = 2.0 m/s²
We need to calculate the time for A
Using equation of motion
[tex]s=ut+\dfrac{1}{2}at_{A}^2[/tex]
Put the value in the equation
[tex]30=0+\dfrac{1}{2}\times1.6\times t_{A}^2[/tex]
[tex]t_{A}=\sqrt{\dfrac{30\times2}{1.6}}[/tex]
[tex]t_{A}=6.12\ sec[/tex]
We need to calculate the time for B
Using equation of motion
[tex]s=ut+\dfrac{1}{2}at_{B}^2[/tex]
Put the value in the equation
[tex]30=0+\dfrac{1}{2}\times2.0\times t_{B}^2[/tex]
[tex]t_{B}=\sqrt{\dfrac{30\times2}{2.0}}[/tex]
[tex]t_{B}=5.48\ sec[/tex]
We need to calculate the time for longest nap
Using formula for difference of time
[tex]t'=t_{A}-t_{B}[/tex]
[tex]t'=6.12-5.48[/tex]
[tex]t'=0.64\ s[/tex]
Hence, B can take 0.64 sec for the longest nap .
1) A football player kicks a ball at an angle of 30 and gives it a velocity of 15m/s.
A) What was the time of flight?
B) How far horizontally does the ball land?
C) How high does the ball reach?
Answer:
A) 1.53s
B) 19.8m
C) 2.869m
Explanation:
A) The time of flight for a projectile can be calculated using the formula:
t = 2μsinθ/g
Where; u = velocity
θ = angle
g = acceleration due to gravity (9.8m/s^2)
t = 2 × 15 × sin 30°/9.8
t = 30sin30°/9.8
t = 30 × 0.5/9.8
t = 15/9.8
t = 1.53s
B) The horizontal range (distance) for a projectile can be calculated using the formula:
Range = u²sin2θ/ g
Range = 15² sin 2 × 30 / 9.8
Range = 225 sin 60/9.8
Range = 225 × 0.8660/9.8
Range = 194.855/9.8
Range = 19.8m
C) The maximum height for a projectile can be calculated using the formula:
h = u²sin²θ/2g
h = 15² (sin 30)² / 2 × 9.8
h = 225 × 0.25 / 19.6
h = 56.25/19.6
h = 2.869m
Which of the following is most likely to happen when energy is transferred to
an object?
A. The object will stay exactly the same.
B. The force on the object will decrease.
o
C. The object will begin to move.
D. The mass of the object will increase.
AUTEM
Answer:The object will begin to move
Explanation:
A car goes from rest to 25 m/s in 10 seconds. Determind the acceleration of the car.
Answer:
2.5m/s^2
Explanation:
a=velocity/time
a=25m/s/10s
a=2.5m/s^2
A race car accelerates from 0 m/s to 30.0 m/s in 5 seconds. What is the vehicle's acceleration?
Answer:
Acceleration = 6 m/s²
Explanation:
Given:
Initial velocity u = 0 m/s
Final velocity v = 30 m/s
Time taken t = 5 second
Find:
Acceleration
Computation:
v = u + at
30 = 0 + (a)(5)
30 = 5a
Acceleration = 30 / 5
Acceleration = 6 m/s²
A wire is placed within a magnetic field, and a current starts to flow through
the wire. Which statement about the magnetic field must be true?
O A. The field is produced by permanent magnets,
O B. The field is moving
C. The field is produced by induced magnetism.
OD. The field is not moving
PLEASE PLEASE HELP QUICK
Answer:
B. The field is moving
what are the bonds between carbon atoms in diamond?
Thermal energy is the energy
an object has due to the
of the
particles.
Answer:
due to the heating of particles
what magnetically happens when there is an electric current in a wire?
Answer:
you change the direction of the magnetic field.
Explanation:
Because the magnetic field created by the electric current in the wire is changing directions around the wire, it will repel both poles of the magnet by bending away from the wire.
PLEASE HURRY! :) TEN PTS + BRAINLIEST TO FIRST BEST ANSWER!
When Object 1 came into contact with Object 2, Object 2 got warmer. What can be concluded about the objects before they came into contact with each other?
Object 2 did not have thermal energy.
Object 1 had faster-moving particles.
Object 1 had less thermal energy.
Object 2 had fewer particles.
Answer:
object 1 had faster-moving particles.
Before the two objects came into contact with each other, object 1 had faster-moving particles.
What is thermal energy?
The thermal energy of an object is the energy possessed by the object due to temperature difference.
The thermal energy of an object increases with increase in kinetic energy of the object. The kinetic energy of the object increases with increase in speed of the object.
Thus, we can conclude that before the two objects came into contact with each other, object 1 had faster-moving particles.
Learn more about thermal energy here: https://brainly.com/question/7541718
can you tell Which body part does not help in the perception and production of sound in humans?
ears, lungs, mouth or vocal cords
which is not?
Lungs do not help in the perception and production of sound in humans.
What are lungs?Gaseous exchange occurs during inhalation and exhale during breathing. Main components of the human respiratory system include the nose, mouth, throat, larynx, trachea, bronchi, and lungs.
In humans and other vertebrates, the primary organs for respiration are the lungs. They are situated in the thoracic cavity of the chest, on either side of the heart. The lungs are spongy, anatomically speaking, with a total surface area that ranges from 50 to 75 square meters.
The lungs' main job is to make it easier for gases to move from the blood into the air. It's interesting to note that the right lung is significantly larger and heavier than the left.
Hence, lungs do not help in the perception and production of sound in humans.
Learn more about lungs here:
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Salmon often jump waterfalls to reach their
breeding grounds.
Starting downstream, 2.08 m away from a
waterfall 0.63 m in height, at what minimum
speed must a salmon jumping at an angle of
44 ◦
leave the water to continue upstream?
The acceleration due to gravity is 9.81 m/s
2
.
Answer in units of m/
Answer:
5.45 m/s
Explanation:
Given:
Δx = 2.08 m
v₀ₓ = v₀ cos 44°
aₓ = 0 m/s²
Δx = v₀ₓ t + ½ aₓ t²
2.08 m = (v₀ cos 44°) t + ½ (0 m/s²) t²
2.89 = v₀ t
Given:
Δy = 0.63 m
v₀ᵧ = v₀ sin 44°
aᵧ = -9.81 m/s²
Δy = v₀ᵧ t + ½ aᵧ t²
0.63 m = (v₀ sin 44°) t + ½ (-9.81 m/s²) t²
0.63 = 0.695 v₀ t − 4.905 t²
0.63 = 0.695 (2.89) − 4.905 t²
t = 0.530
v₀ = 5.45 m/s
what is called gravity
What is the relationship between Mass and Force when Speed is constant?
Answer:Newton's second law of motion states that acceleration is directly proportional to net force when mass is constant and that acceleration is inversely proportional to mass.
Explanation: the net force is directly proportional to mass when acceleration is constant.
A reader's
read
is the extent to which he or she is engaged with or focused on what is being
activity level
background knowledge
purpose
text
I DONT KNOW WHAT THESE SUBJECT IS IN BUT IF U SEE THIS PLS HELP ME PLSSSSS!!!!!
Answer:
activity level
Explanation:
SOMEONE PLEASEEEE HELPP
Answer:
0.161
Explanation:
N = mg
= 8.2(9.81)
= 80.442 N
How does metamorphic rock change into another type of metamorphic rock?
Which of the statements about the nitrogen cycle is not true? Animals get nitrogen by eating plants or other animals Animals get nitrogen by eating plants or other animals Decomposers break down waste to yield ammonium Decomposers break down waste to yield ammonium Nitrogen moves back and forth between the atmosphere and living things Nitrogen moves back and forth between the atmosphere and living things All plants generate nitrogen in their roots
Answer:
decomposers break down waste to yield ammonia.
Explanation:
The nitrogen cycle is the process by which nitrogen circulates among the atmosphere, terrestrial, and marine ecosystems and is converted into multiple chemical forms through both biological and physical processes.
In the nitrogen cycle, decomposers do not break down waste to yield ammonia.
So, the option ''decomposers break down waste to yield ammonia'' is correct.
A car moves at the constant speed of 20 m/s along a straight track for 12 seconds. Calculate how far it travels in meters in this time.
The distance traveled by car with a constant speed of 20m/s is equal to 240m.
What is speed?The speed of an object can be defined as the distance traveled by the object in a definite time interval. The speed is a scalar quantity as it carries only the magnitude and does not have any direction.
The speed can be calculated from the ratio of the distance traveled by the object to the time taken to cover that distance.
The speed equation for an object can be written as follows:
Speed = distance /time taken
Distance = Speed × time
Given, the speed of the car = 20 m/s
The total time taken by car to travel the distance = 12 sec
The distance traveled by car = 20 × 12 = 240 m.
Therefore, the car will travel a distance of 240 meters in a given time.
Learn more about the speed, here:
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1. What happens to particle spacing when temperature increase, What we call this process?
Answer:
Particle spacing increases and it's called evaporating
Melissa is riding on a carousel at a distance of 8.0 m from the center of the ride. She travels at a speed of 1.3 m/s. Melissa has a mass of 45 kg.
A) What is Melissa’s acceleration?
B) What is the net force on Melissa?
Answer:
(A) The acceleration of Melissa is 0.211 m/s²
(B) The net force on Melissa is 9.5 N
Explanation:
Given;
radius of the carousel, r = 8.0 m
speed of Melissa, v = 1.3 m/s
mass of Melissa, m = 45 kg
(A) The acceleration of Melissa is given by centripetal acceleration;
[tex]a_c = \frac{v^2}{r} \\\\a_c = \frac{1.3^2}{8}\\\\a_c = 0.211 \ m/s^2[/tex]
(B) The net Force on Melissa is given by centripetal force;
[tex]F_c = ma_c\\\\F_c = 45 *0.211\\\\F_c = 9.5 \ N[/tex]
Alice and Marge are studying the properties of matter. The girls placed some an iron nail in a beaker containing water. Iron is a solid metal at room temperature. Iron is a shiny and malleable; it can be formed into shapes like the nails the girls used. Iron will turn reddish-brown in the presence of air or water as it rusts. Iron is a good conductor of electricity and heat. After 48 hours, the girls checked the nail in the water and compared it to the nail they left on the lab bench. Here is a photo of their results.
Based on the girls' experiment, what is a chemical property of iron?
Answer:
When substances made of iron are exposed to oxygen and moisture (water), rusting takes place. Rusting removes a layer of material from the surface and makes the substance weak. Rusting is a chemical change.
Answer:
B) Iron rusts in water
Explanation:
Physical property is defined as the property of a substance which becomes evident during physical changes. Example: Melting point , electrical conductivity, malleability,
Chemical property is defined as the property of a substance which becomes evident during chemical changes. Example: Reactivity with other substances
Rust is hydrated ferric oxide .
Corrosion of iron is called as rusting. Rust is hydrated ferric oxide .
Thus rusting of iron is a chemical property.
What is the acceleration of a car making a turn in a circle with a 100m radius traveling at
17m/s?
Answer:
2.89 m/s²
Explanation:
From the question given above, the following data were obtained:
Radius (r) = 100 m
Velocity (v) = 17 m/s
Acceleration (a) =.?
The acceleration of a circular motion is defined by:
a = v²/r
Where:
a is the acceleration.
v is the velocity.
r is the radius.
With the above formula, we can obtain the acceleration of the car as follow:
Radius (r) = 100 m
Velocity (v) = 17 m/s
Acceleration (a) =.?
a = v²/r
a = 17²/ 100
a = 289/100
a = 2.89 m/s²
Therefore, the acceleration of the car is 2.89 m/s²
which technological advance has helped scientists to search for life in other star systems?
Answer:
Scientists are developing techniques to detect signatures from space in their search for alien life.
The Very Large Array (VLA) telescope, at the National Radio Astronomy Observatory (NARO) site in Socorro, New Mexico, will be used to constantly seek evidence of technosignatures.
Hope this helps