Answer:
it loses its momentum. In simpler ways it is really slow
Explanation:
A 150 lb person and a 200 lb person run into each other.
What can you say about force?
Who accelerated the most? Why?
Explanation:
1. Force is something that pushes or pulls you
2. The 150 lbs person accelerated faster because they had less force pushing or pulling them down.
Plants appear green because they do not absorb the green wavelengths of light. What happens to those green light waves when they hit a plant? The are diffracted. They are absorbed. They are reflected. They are refracted.
Answer:
They are reflected.
Explanation:
Red light is absorbed while green light is reflected, causing the color to be green in human eyes.
Answer:
C
Explanation:
If a car traveled 60 m in 30 s, what is the velocity?*
Answer:
6.56168
Explanation:
A 58 kg skier starts at rest from a 24.0 m high hill. They travel to the bottom and then up a second hill to a height of 19.0 m. How much kinetic energy do they have at the top of the second hill?
Answer:
10.791 kJ
Explanation:
Given that,
Mass of the skier, m = 58 kg
Initial position, h₁ = 24 m
Final position, h₂ = 19 m
We need to find the kinetic energy do they have at the top of the second hill.
Using the conservation of energy for both positions.
[tex]v_1=\sqrt{2gh_1} \\\\=\sqrt{2\times 9.8\times 24} \\\\=21.68\ m/s[/tex]
And
[tex]v_2=\sqrt{2gh_2} \\\\=\sqrt{2\times 9.8\times 19} \\\\=19.29\ m/s[/tex]
Kinetic energy :
[tex]K=\dfrac{1}{2}mv_2^2\\\\K=\dfrac{1}{2}\times 58\times 19.29^2\\\\=10791.01 J\\\\=10.791\ kJ[/tex]
So, the kinetic energy they have at the top of the second hill is 10.791 kJ.
Which of the following is an example of work: bowling or reading?
Answer:
bowling
Explanation:
bowling is an example of work because it involves hand movement.
Deanna's niece loves to swing at the local playground, so Deanna takes her and pushes her on the swing. Deanna must use (motion / transfer / force / energy) to exert a (transfer / motion / force / energy) that causes the swing to change (force / energy / motion / transfer/position).
AnswerShe uses force and air
Explanation:
n bhvygvg gv
Name one process that requires a force in the human body. Hint: the question is asking about something happening inside of the body like muscle contractions.
Answer:
Movement
Explanation:
Tom drives on a highway and never changes his speed for the whole journey. He drives for 300 miles and it takes him 5 hours. What is Tom's speed on the highway?
Answer:
QESARDFRGTSRTATFREVERSRvrvqwqv
Explanation:
vfqfvcafbraf w rfdsd AEWvd a
An object completes 10 cycles in 50s.
a. What is the period of its rotation?
b. What is the frequency of its rotation?
Answer:
.
Explanation:
Explanation:
Given parameters:
Number of cycles = 10cycles
Time taken = 50s
Unknown:
Period of its rotation = ?
Frequency of its rotation = ?
Solution:
The period of rotation is the time taken time taken for a body to complete a number of rotation;
Period = [tex]\frac{t}{n}[/tex]
t is the time
n is the number of cycles
Period = [tex]\frac{50}{10}[/tex] = 5s
The period is 5s
Now, frequency is the inverse of period;
F = [tex]\frac{1}{period}[/tex] = [tex]\frac{1}{5}[/tex] = 0.2Hz
A car moving round a circular racing track takes 120s to do a lap of 8km what is the speed in km/hr.
Answer:
Solution in photo
Explanation:
A car moves around in a circular racing track, and it takes 120 seconds to do a lap of 8 km, so the speed in km/hr is 239.76 km/hr.
What is Speed?The speed of an object, commonly known as v in mechanics, is a scalar quantity that corresponds towards the size of the change in that object's position over duration or the size of the change in that object's position per unit of time.
The instantaneous velocity is the absolute maximum of the average speed as the time interval's duration gets closer to zero. The cruising pace of an object in a time interval is calculated by dividing its distance traveled by the time interval's duration. Velocity and speed are different concepts.
The given data according to the question is,
Time, t = 120 s
Distance, d = 8 km
s = 8/120
s =0.0666 km/sec or
s = 0.0666/1s × 3600
s = 239.76 km/hr.
Therefore, the speed is 239.76 km/hr.
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Tyler is in downtown San Antonio entertaining the tourists with amazing feats of physics. He carries a nickel
(mass of 5.0 grams) up to the top of the Tower of the Americas and places it on the edge of the observation
deck, a height of 124 meters. Tyler pushes the nickel off the edge of the Tower, and then tells the tourists
that he will be able to calculate the velocity of the nickel just before it hits the ground. What will be the
nickel's velocity?
Answer:
The velocity of the nickel just before it hits the ground is approximately 49.3 m/s
Explanation:
In order to calculate the velocity of the nickel just before it hits the ground, we recall the kinematic equation of motion, v² = u² + 2·g·h, where the variables of the equation are defined as follows;
v = The velocity of the nickel just before it hits the ground after it is pushed off the observation deck
u = The initial velocity of the nickel just before it is pushed off the observation deck = 0 m/s
g = The acceleration due to gravity = 9.8 m/s²
h = The height from which he nickel is pushed off the edge = 124 m
Substituting the given values and the constant, "g", we have;
v² = 0² + 2 × 9.8 × 124 = 2,430.4
v = √2,430.4
Using a graphing calculator, we have;
v = √2,430.4 = 14·√(62/5) ≈ 49.3
The velocity of the nickel just before it hits the ground = v ≈ 49.3 m/s.
If the body's temperature is above 105 °F for a prolonged period, heat stroke
can result. Express this temperature on the Celsius scale.
OA 40.5°C
OB 58.3°C
OC 76.1°C
KOD 131.4°C
Answer:
A
Explanation:
C = (F-32)*5/9 = 73*5/9 = 40.55555
since the answers are spread apart, technically you can just estimate by doing -32
and then /2
since 5/9 is close to 1/2
A Force that does not change an object velocity
Answer:
I think ur wrong to say force doesn't change an object velocity
Explanation:
Force affects how objects move. They change the direction of motion of an object that is already moving. Since force causes a change in the speed or direction of an object, we may say that force causes changes in an object velocity.
Intact fossils are usually found in sedimentary rock, not metamorphic rock. Based on the information in the diagram, what is the reason for this phenomenon?
Explanation:
The reason for this phenomenon is the due to the condition by which each type of rocks form.
A sedimentary rock is formed by the compaction and lithification of sediments within a basin.
A metamorphic rock forms under high temperature and pressure conditions which alters the minerology of a rock.
Based on these conditions, the metamorphic rock cannot host any fossil. Any relics of fossils would be destroyed at such elevated pressure and temperature conditions. This is not so in a sedimentary rock because the conditions are similar to that which can preserve organic matter.Answer:
The heat and pressure of metamorphism would deform the fossil, and the process of melting would destroy the fossil completely.
Explanation:
PLATO
What causes the electrons to move in the “Electromagnetic Induction” animation?
a.
Current
c.
Changes in magnetic field
b.
Voltage
d.
Kinetic energy
Please select the best answer from the choices provided
A
B
C
D
Answer:
Change in the magnetic field
Science help please!
Answer:
104 N
Explanation:
m = 1300 kg
a = 0.08m/s^2
F = 1300*0.08
F = 104 N
Newtons is the unit of force.
An object decelerates from 25.0 m / s to 5.0 m / s in a time of 4.0 s. It has a mass of 50 kg. What is the resultant force on the object?
Answer:
10 N
Explanation:
Force = Mass÷Acceleration
F= 50 ÷ 5
= 10 N
______________________
Acceleration =
[tex] \frac{5 - 25}{4 } [/tex]
= 5m/s2
Given:
Mass, m = 50 kgAcceleration, a = 5.0 m/sTime, t = 4.0 sAs we know,
The acceleration will be:
= [tex]\frac{5-25}{4}[/tex]
= [tex]5 \ m/s^2[/tex]
hence,
The force will be:
→ [tex]F = \frac{m}{a}[/tex]
By substituting the values, we get
[tex]= \frac{50}{5}[/tex]
[tex]= 10 \ N[/tex]
Thus the above response is right.
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Which of the following statements about Copernicus' heliocentric model of the Solar System are accurate?
It was the first such model was supported by scientific evidence.
It was not published until Copernicus was close to death.
It was the first time a heliocentric model had ever been suggested.
It was not controversial, and was readily accepted.
It stated that the Sun revolved around the Earth.
It stated that the Earth revolved around the Sun.
Answer:
(i) It was the first such model was supported by scientific evidence: FALSE
(ii) It was not published until Copernicus was close to death: TRUE
(iii) It was the first time a heliocentric model had ever been suggested: FALSE
(iv) It was not controversial, and was readily accepted: FALSE
(v) It stated that the Sun revolved around the Earth: FALSE
(vi) It stated that the Earth revolved around the Sun: TRUE
Explanation:
We proceed to demonstrate the validity of each option from statement:
(i) It was the first such model was supported by scientific evidence: FALSE
The geocentric model was based mostly on interpretation of two astronomical findings: (a) The displacement of the stars with respect to Earth due to stellar parallax, (b) The apparent consistency of brightness of the planet Venus seen from Earth.
(ii) It was not published until Copernicus was close to death: TRUE
Copernicus published his heliocentric theory, contained in the book De revolutionibus orbium coelestium, months before his death, in 1543.
(iii) It was the first time a heliocentric model had ever been suggested: FALSE
Greek mathematician and astronomer Aristarchus of Samos was the first person who proposed the heliocentric model in the 4th Century.
(iv) It was not controversial, and was readily accepted: FALSE
The Roman Catholic Church defended geocentric model proposed by Claudius Ptolemy and Tycho Brahe and rejected the model proposed by Copernicus, whose publication was included in the Index Librorum Prohibitorum in 1616.
(v) It stated that the Sun revolved around the Earth: FALSE
This is the main idea of the geocentric model.
(vi) It stated that the Earth revolved around the Sun: TRUE
This is the main idea of the heliocentric model.
What is always true about the light ray that emerges from the right side of the lens?
Which statement about the relationship between air pressure and air density is accurate?
A) Air pressure decreases as air density increases
B) Air pressure increases as air density increases
C) Air pressure increases as air density decreases
D) Air pressure is unrelated to air density
Answer:
A: Air pressure decreases as air density increases
Explanation:
Pressure is a force exerted on or against an object by being in contact with a substance. Thus, air pressure is due to the bombardment of the air (gas) particles with a surface. Density is defined as the mass per volume of a substance. Thus, air density is defined as the mass of air per unit volume.
If that Explanation does not make any sense let me make it easier.
The air at the top of a mountain is cooler than the air at the bottom. This temperature difference is due to a phenomenon that occurs in Earth’s atmosphere. Air rises and sinks based on differences in temperature and pressure. Here’s a quick experiment that will help explain the role of pressure.Take in a deep breath as if you were ready to blow out birthday candles. Puff your cheeks with air like a chipmunk. Hold it for a few seconds, and then blow the air slowly from your cheeks.Cold air sinks while warm air rises because cold air is denser than warm air. When a lot of cold air sinks, it creates an area of high air pressure where it hits the surface. This high-pressure air flows to an area of low pressure, creating wind. When this air warms, it rises up into the atmosphere.Temperature decreases as altitude increases. That’s why a mountain peak may be covered with snow while the bottom of the mountain is full of green plants and trees. When warm air rises into the atmosphere, it cools. The density of the air increases as it cools, which eventually creates an area of high pressure and starts the cycle again.
If not for this phenomenon of air rising and sinking in the atmosphere, there would be no wind or weather.
I hope that helped!
Please Help Me!!!!!!
Answer:
..
Charcoal is flammable.
What does anaerobic mean?
A. Short bursts of energy
B. Without oxygen
C. Intense physical output
D. With oxygen
Answer:
without oxygen because
Answer:
Without oxygen
Explanation:
In 1630 at the beginning of European settlement, about 425,000,000 hectares of the United States were covered with trees. By 2017, the area covered by trees was reduced to 300,000,000 hectares. What is the percentage decrease in the area covered by trees between 1630 and 2017?
Answer:
29.41%
Explanation:
Given that,
In 1630 at the beginning of European settlement, about 425,000,000 hectares of the United States were covered with trees.
By 2017, the area covered by trees was reduced to 300,000,000 hectares.
We need to find the percentage decrease in the area covered by trees between 1630 and 2017.
The percentage decrease in any value is given by :
[tex]\%=\dfrac{300,000,000 -425,000,000 }{425,000,000 }\times 100\\\\=29.41\%[/tex]
So, the percentage decrease in the area covered by the trees is 29.41%.
A ray of light travelling in air enters obliquely into water. Does the light ray bends towards the normal or away from the normal? Why?
Explanation:
The refraction index of water (1.33) is higher than air (1), therefore the light ray will bend towards the normal.
what are parallel circuits?
Answer:
have two or more paths
Explanation:
A parallel circuit is one that has two or more paths for the electricity to flow, the loads are parallel to each other.
A boy pulls his toy on a smooth horizontal surface with a rope inclined at 60 degree to the horizontal if the effective force pulling the toy along the horizontal surface is 5 Newton calculate the tension in the rope
Answer:
Tension = 2.5 N
Explanation:
Given:
Angle = 60°
Force f = 5 N
Find:
Tension
Computation:
Tension = fcosθ
Tension = (5)cos60
Tension = (5)(1/2)
Tension = 2.5 N
An apple in a tree has a mass of 0.21 kg. If it is 7.2 meters above the ground, how much potential energy does it have?
Answer:
14.8J
Explanation:
PE=MGH
M=0.21
G=9.8m/s
H= 7.2 m
0.21x7.2x9.8= 14.8176 J
What is the average speed of this car over the entire journey ?
Answer: 0.83333333333 km/h
Explanation: give brainliest
How can magnets cause objects to have kinetic energy?
Answer:
this has to do with the drop in voltage, or potential as electrons traverse the material .
How much distance does a car travel if it is driving down the road at 50 m/s before hitting
the gas and accelerating at 3 m/s2 for 20 seconds?
Answer:
from second equation of motion
[tex]S = ut + \frac{1}{2} a {t}^{2} \\ S = (50 \times 20) + (\frac{1}{2} \times 3 \times {20}^{2} ) \\ S = 1000 + 600 \\ S = 1600 \: m[/tex]