A train leaves the station at the 0.0m marker traveling with a constant velocity of 45.0 m/s. How many
seconds later will the train pass the 1500.Om marker? What is the velocity of the train in km/h?
Answer:
119.88 km/h
Explanation:
1500/45=33.3
use a m/s to km/h calculator
put in 33.3 for m/s and you will get 119.88 km/h.
119.88 km/h.
Answer:
33.3 s
162 km/h
Explanation:
Given:
Δx = 1500.0 m
v₀ = 45.0 m/s
a = 0 m/s²
Find: t
Δx = v₀ t + ½ at²
1500.0 m = (45.0 m/s) t + ½ (0 m/s²) t²
t = 33.3 s
Convert m/s to km/h:
45.0 m/s × (1 km / 1000 m) × (3600 s / 1 hr) = 162 km/h
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.
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:
Thermal energy is the energy
an object has due to the
of the
particles.
Answer:
due to the heating of particles
this is due by 11.00 pm send some help pls!!!!
Your science teacher presents you with a circuit model that contains five light bulbs, a switch, and a 1.5-volt battery. The wires of the circuit are hidden from your view so that you cannot see how the bulbs are connected to the battery. How could you determine the type of circuit used in this model?
A.
If all the bulbs are equal brightness, it is a series circuit because each bulb in a series circuit has the same resistance.
B.
If all the bulbs are equal brightness, it is a parallel circuit because each bulb in a parallel circuit has its own path to the battery.
C.
If you unscrew one bulb and all the others stay lit, it is a parallel circuit because each bulb in a parallel circuit has its own path to the battery.
D.
If you unscrew one bulb and all the others stay lit, it is a series circuit because each bulb in a series circuit have to share the same current.
Answer:
C
Explanation:
PLACING BULBS IN SERIES
Increasing the number of bulbs decreases the brightness of the bulbs.
The resistance increases. In a series circuit, adding bulbs increases the resistance in the circuit. A complete circuit requires the electrons to move from the negative terminal of the battery to the positive terminal. When one bulb is unscrewed it opens the circuit preventing a complete circuit and the electrons cannot return to the battery.
PLACING BULBS IN PARALLEL
Two bulbs in parallel are brighter than two bulbs in series. In a parallel circuit each bulb is in its own circuit. As bulbs are added the resistance in the circuit decreases since each circuit is another pathway for electrons to move from one end of the circuit to the other.
If you unscrew one bulb and all the others stay lit, it is a parallel circuit because each bulb in a parallel circuit has its own path to the battery.
What is bulbs in series combination?The brightness of the bulbs reduces as the number of bulbs increases in series. Resistance rises in intensity. Adding bulbs to a series circuit raises the circuit resistance. The electrons must pass from the battery's negative to positive terminals in order for the circuit to be complete. When one bulb is removed, the circuit is broken, making it impossible for the electrons to return to the battery.
What is bulbs in parallel combination?In comparison to two bulbs in series, two bulbs in parallel are brighter. Each bulb is in its own circuit when the circuits are parallel. As more bulbs are added, the resistance in the circuit reduces because each additional circuit provides an additional route for electrons to travel from one end to the other.
You can determine the type of circuit used in this model by unscrewing one bulb and all the others stay lit, it is a parallel circuit because each bulb in a parallel circuit has its own path to the battery. Hence, option(C) is correct.
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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
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]
A roller coaster has a mass of 300 kg. It drops from rest at the top of a hill that's 101 m tall. How fast is it going when it reaches the bottom? Acceleration due to gravity is g = 9.8 m/s2 .
Answer choices:
A. 41.2 m/s
B. 21.8 m/s
c. 44.5 m/s
D. 76.7 m/s
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 .
How does metamorphic rock change into another type of metamorphic rock?
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.
Erosion is the process by which soil and sediments are moved by gravity, wind, and water. Erosion occurs naturally, but it can be accelerated by human activity. Which of these human activities most contributes to soil erosion?
biking on forest trails
boating on a lake
cutting down trees
fertilizing a lawn
Answer:
Cutting down trees
Explanation:
The roots of trees often hold settiments in place, thus removing these strong natural barriers makes it easier for erosion to occur.
Which chemical bond has a low melting point? Why does this bond have low melting points? A common compound that this bond produces is used in our everyday life. SUGAR!
Answer:
1,2: When simple molecular substances melt or boil, it is these weak intermolecular forces that are overcome. The covalent bonds are not broken. Relative little energy is needed to overcome the intermolecular forces, so simple molecular substances have a low melting and boiling points.
3: Water, Almost no living thing can survive without water. Water is everywhere on our planet. It is the reason we have an organic life on earth. A water molecule consists of one oxygen atom combined with two hydrogen atoms. We use water throughout day and night; in drinking, cooking, household needs, industries, and agriculture. Apart from these general uses of water, you might be amazed to know that water plays a major role in volcanic eruptions.
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
Within only a few seconds, Ana determines that she does not wish to be at this fraternity party and makes a hasty exit back
to her dorm. Which of the following was responsible for Ana's immediate, intuitive reactions to this "frat party"?
a. left brain
b. reflex arc
C. cognitive unconscious
d. righ brain
Answer:
left brain the left brain is your rapid more irrisponsibe side while your right cortex thinks about the potential outcomes
Help! I'm in a pinch and need help!!! WILL BRAINLIEST! I am SUper BaD at this SUbJect.
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What does the weight of an object depend on?
A. Time taken for an event to occur
B. Temperature of the object
C. Force of gravity
D. Atmospheric pressure
Answer:
The Answer is C. The force of gravity
Explanation:
This is because it is the force of gravity exerted or inflicted upon the object or organism. With more gravity inflicting upon an object the heavier it feels. In fact, weight and gravity have such a close relationship that the equation for weight is F = M x A where F represents the objects weight in Newtons, M equals it's mass, and A represents the downward acceleration due to the gravity.
Answer:
The answer is c
Explanation:
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.
Please i just need help
Answer:
D
Explanation:
it's the only negative one
Answer:
letter C.
Explanation:
if an element forms a 2+ ion , in which group of the periodic table would you expect to find it ?
A. 17
B. 1
C. 18
D. 2
Answer: D
Explanation:
what is quantum physics and what is the equation for space time and travel?
Answer:
Im not smart
Explanation:
but im your bff
Answer:
it explain how everythings work you should work with the speed of light multiply with the distance of the equator
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
How are mass and acceleration related (if you change one of them, what happens to the other one)?
1. What happens to particle spacing when temperature increase, What we call this process?
Answer:
Particle spacing increases and it's called evaporating
In which states of matter can an object change both volume and shape?
A. Gas and plasma
B. Gas and liquid
C. Liquid and plasma
D. Liquid and solid
Answer:
I believe it would be B.
Explanation:
When a object is in a gas or liquid form then take whatever the form of the container they are in is. Meaning they can change their volume depending on the container. Also a characteristic of gas and liquid is to take the shape of the container. This may be wrong but this is what I would choose
Answer: A is actually the correct answer. The guy who said B is wrong
Explanation: Gas and plasma both have Changing shape and changing volume
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 population of lobsters was recently exposed to a new disease. Which type of limiting factor is this disease and what will be its predicted impact on the carrying capacity of this population? Group of answer choices density independent; the carrying capacity will increase density dependent; the carrying capacity will decrease density dependent; the carrying capacity will increase density independent; the carrying capacity will be reduced
Answer:
the carrying capacity will decrease density dependent
Explanation:
The limiting factor of the disease is density dependent and will decrease the carrying capacity of the population because the disease that affect the population operate when the number of organisms in per unit area get to a specific level , it's affected the population when the population per unit are reached a certain level and the disease decrease the carrying capacity of the population. Carrying capacity is the average population size of organisms in an habitat. As the lobsters population is affected by disease, the population sizes reduced because many of the lobsters would of died and inactive, thereby causing a reduction in the size and capacity.
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.
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IF RONALD CAN TAKE 2 GOLIATH DILD0S HOW MANY CAN TONY TAKE
USING THE PYTHAGOREAN THEOREM
Answer:
69
Explanation:
how do I make a baby come out of a pickle?
Answer:
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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.
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