FIRST 3 TO ANSWER GETS BRAINLIEST
Make a claim about the relationship between potential energy, kinetic energy, and speed.What is your evidence?
Answer: When an object falls, its gravitational potential energy is changed to kinetic energy. You can use this relationship to calculate the speed of the object's descent.
A wave has a frequency of 4.0 Hz. If it is traveling at a velocity of 20 m/s, what is the wavelength of the wave? A. 80 m B. 0.2 m C. 16 m D. 5.0 m
Answer:
D
Explanation:
λ=v/f where λ is wave length
v is speed
f is frequency
The wavelength of the wave is equal to: D. 5.0 meters.
Given the following data:
Frequency = 4.0 HzVelocity = 20 m/sTo determine the wavelength of the wave:
Mathematically, the wavelength of a wave is calculated by using the formula;
[tex]Wavelength = \frac{Speed }{frequency}[/tex]
Substituting the given parameters into the formula, we have;
[tex]Wavelength = \frac{20}{4.0}[/tex]
Wavelength = 5.0 meters
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The number of electrons in an atom decreases as you move from left to right in the periodic table.
There are 24 teeth on the input gear and 6 teeth on the output gear. What is the gear ratio?
A car slows down from 80 km/h to 60 km/h in 2 seconds.
a. Convert both the initial and final velocities into m/s.
b. What is the car’s acceleration in m/s2?
c. What is the distance traveled?
Answer:
please mark brainlist
Explanation:
Initial speed u=80 km/h=80×185=22.22 m/s
Final speed v=60 km/h=60×185=16.67 m/s
Using v=u+at
Or 16.67=22.22+α×5
⟹ a=−1.1 m/s2
What is a likely direct effect of a community program for local residents?
A. lower education costs
B. higher healthcare costs
C. higher salaries
D. Improved safety for children
Explanation:
improved saftey for children
Answer:
D. Improved safety for children
Explanation:
Toy cars
1
11,
2
22, and
3
33 are launched horizontally with the trajectories shown below. Cars
1
11 and
2
22 are launched from a
15
m
15m15, start text, m, end text high cliff, while Car
3
33 is launched from a
30
m
30m30, start text, m, end text high cliff. We can ignore air friction.
Answer:
tcar 1 = tcar 2< tcar 3
Explanation:
khan academy
Initial launch speed of the cars are in order as Vcar 1 = Vcar 2< Vcar 3
What is speed?The speed of any moving object is the ratio of the distance covered and the time taken to cover that distance.
Toy cars 1, 2 and 3 are launched horizontally with the trajectories shown below. Cars 1 and 2 are launched from a 15 m high cliff, while Car 3 is launched from a 30m high cliff. We can ignore air friction.
The velocity of the toy car 1 and 2 is
V1/2 = √2gh
Put the values, we get
V 1/2= √(2x 9.81x 15)
V1/2 = 17.16 m/s
The velocity of the toy car3 is
V3 = √2gh
Put the values, we get
V3 = √(2x 9.81x 30)
V3 = 24.26 m/s
Thus, Vcar 1 = Vcar 2 < Vcar 3
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The parking brake on a 1200kg automobile has broken, and the vehicle has reached a momentum of 7800kgm/s. What is it's
velocity? m/s
Answer:
the velocity is like 17 or something ion even know
Explanation:
Why do objects fall?
Answer:
gravity
Explanation:
the Forest of gravity causes objects to fall toward the center of the Earth.
Answer:
due to gravitational force.
HELP!!!
7. A block rests on a frictionless table on Earth. After a 20-N horizontal force is applied to the
block, it accelerates at 3.9 m/s^2.Then the block and table are carried to the moon, where the
acceleration due to gravity is 1.62 m/s^2. A horizontal force of 10 N is then applied to the block.
What is the acceleration?
A)2.0 m/s2
B)2.1 m/s2
C)1.8 m/s2
D)2.3 m/s2
E)2.5 m/s2
Question 5
A ball is traveling through space at a velocity of 25 m/s. Which statement BEST describes the motion of a moving ball if there is no external force is applied to the ball?
A
The ball stops immediately.
B
The ball will move with a constant speed.
С
The ball will slowly accelerate.
The ball will slow down and eventually stop
D
43
Answer:
B. The ball will move with a constant speed.
Explanation:
Assuming a ball is traveling through space at a velocity of 25 m/s. The statement which best describes the motion of this moving ball if there is no external force applied to the ball is that, the ball will move with a constant speed in accordance with Newton's first law of motion.
Newton's first law of motion states that, an object or body will continue to be at rest or experience a uniform motion in a straight line at constant speed provided there's no action of an external force. Thus, unless compelled to change its state by an external force, a body will continue to be at rest or experience a uniform motion in a straight line.
The Newton's first law of motion is also known as the law of inertia; which is the tendency of a body to be at rest unless acted upon by an external force.
Jaime knew that altitude influenced the climate because he lived in the Rocky Mountains at a high altitude. Altitude is a more important factor in climate than latitude in mountainous areas. What relationship exists between altitude and other climate factors? A. An increase in altitude results in higher levels of precipitation. B. An increase in altitude results in an increase in air pressure. C. An increase in altitude results in a decrease in temperature. D. An increase in altitude results in a lessening of wind speed
Answer:
C. An increase in altitude results in a decrease in temperature.
Explanation:
The climate of an area is highly influenced by its altitude especially in mountain areas.
At higher altitudes or mountains, the air molecules above a given surface are fewer that decreases the air pressure in the area and decreases the temperature of the area as well. Because of fewer air molecules, gases absorb very little of the incoming solar radiation and cause decrease in temperature.
Hence, the correct answer is "C. An increase in altitude results in a decrease in temperature."
Two friends push a stalled
1330 kg car with a 187 N force,
How much time does it take
to move the car 5.00 m?
(Unit = s)
Answer:
8.42s
Explanation:
The time (in seconds) needed to move the car can be calculated using the formula:
S = ut + 1/2at²
Where; S = distance (m) = 5m
u = initial velocity (m/s)
a = acceleration (m/s²)
t = time (s)
However, the acceleration (a) can be got by using F = ma
Where; F = force = 187 N
m = mass = 1330 kg
F = ma
a = F/m
a = 187/1330
a = 0.1406
a = 0.141m/s²
Since a= 0.141m/s², S = 5m, t =
S = ut + 1/2at²
5 = (0 × t) + 1/2 × (0.141 × t²)
5 = 0 + 0.141t²/2
5 = 0.141t²/2
10 = 0.141t²
t² = 10/0.141
t² = 70.922
t = √70.922
t = 8.42s
Miss Magee has to drive 7 1/2 km to get to school. On Monday she drove to school and arrived at 8:00am,
she realized she'd forgotten her laptop, drove back home picked up the laptop, then returned to school.
How far did she drive before school started?
Answer:
15km
Explanation:
7 1/2 pluse (im new but know a alot of math)7 1/2 equals 15km
Which of the following is an example of distance equaling displacement?
A. Mr. Mercer leaves his house and drives to PFHS and then returns home
B. Dr. Wolfe runs away from a dinosaur in a straight line
C. Coach Longchamp jogs one lap around the PFHS track
D. A student leaves class, realizes they forgot their iPhone, then returns to retrieve it.
Answer:
D
Explanation:
The student had displaced their in the class when she left. The phone is what's displaced and student leaving equals distance.
Scientists have differing views on the origin of the universe. One view suggests the universe is expanding everywhere at the same time. This would mean galaxy clusters must have been closer in the past. Which of the following correctly identifies the proper name given to this thought?
a
Big Bang Theory
b
Doppler Shift
c
Oscillating Model
d
Steady State Theory
What distance could a toddler travel if they crawl at a rate of .73 m/s for 20 seconds?
Answer:
14.6 m (meters)
Explanation:
When working with time, and speed.
Use d = st, since s = d/t (just rearanging the formula for speed). d is for distance, t is for time, and s is for speed (velocity with no direction).
To solve for the distance just multiply the rate of speed by the time to get distance.
Given .73m/s is the speed, and 20s is the time.
d = st
d = .73 m/s × 20s
d = .73m × 20
d = 14.6 m
Which claim is true of all matter?
It has mass.
It can be seen.
It exists only as a solid.
It maintains its shape and size.
A rock is thrown upward with a vertical speed of 35 m/s and a horizontal speed of 12 m/s on
level ground. How far away does it land?
Answer:
R = 85.73 m
Explanation:
It is given that,
The vertical speed of a rock, [tex]v_y=35\ m/s[/tex]
The horizontal speed of a rock, [tex]v_x=12\ m/s[/tex]
We know that,
The vertical speed,
[tex]v_y=v\sin\theta=35\ ....(1)[/tex]
Horizontal speed,
[tex]v_x=v\cos\theta=12\ ....(2)[/tex]
Dividing equation (1) by (2) such that,
[tex]\dfrac{v_y}{v_x}=\dfrac{v\sin\theta}{v\cos\theta}\\\\\dfrac{35}{12}=\tan \theta\\\\\theta=\tan^{-1}(\dfrac{35}{12})\\\\\theta=71.07^{\circ}[/tex]
Let v is the initial velocity of the projection. So,
[tex]v=\sqrt{v_x^2+v_y^2} \\\\v=\sqrt{12^2+35^2} \\\\v=37\ m/s[/tex]
We need to find the distance where it will land i.e. the range of the projectile. It is given by the formula as follows :
[tex]R=\dfrac{v^2\sin2\theta}{g}\\\\\text{Putting all the values, we get }\\\\R=\dfrac{37^2\times \sin(2\times 71.07)}{9.8}\\\\R=85.73\ m[/tex]
So, it will land at a distance of 85.73 m.
When throwing curveballs in baseball, is it important to have air hit the ______ part of the ball.
A. smooth
B. rough
C. seam
Answer: A (smooth)
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If you cut a piece of wood in half, each half would have *
1 point
a) Half the density of the original piece
b) Twice the density of the original piece
c) The same density as the original piece
Answer:
c
Explanation:
let's assume that you are splitting the piece of wood horizontally. This would not change the density of the wood at all, only the length. I rest my case. Ur awesome and have an amazing day.
What is the weight of a 200 kg mass?
Answer:
W 1920 N
Explanation:
200kg at a location where g=9.6m/s^2
Which of the following is an example of potential energy?
A kite flying in the sky.
B dog chasing his tail.
C book sitting on a shelf.
D basketball player running down the court.
Answer:
C book sitting on a shelf.
Explanation:
An object can store energy as the result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position
plz mark brainliest
Help please with homework
Answer:
Mhm mhm yes very easy
Explanation:
The answer is 12345678910 and then subtract
Mark Brainliest!
Prior to science lab, Maria had been drinking a can of soda. When she walked into the lab she set it down on the hot plate at her station. She heard a liquid beginning to boil, and realized that the previous students had forgotten to turn off the hotplate and the boiling noise was from the remaining soda in the can. Without thinking, she picked up the can with her bare hands, and put it upside down into the sink which was half full of liquid. Immediately the can crushed as though it was going to be recycled. What do you think is happening to the soda and air in the can? Support you claim in Question 4, by explaining why you think it is happening. Formulate your hypothesis for the problem. Critique Maria's laboratory safety procedures.
Answer:
The hypothesis as to what happened to the soda and the air in the can are as follows;
The solubility of air in the soda is high at low temperatures, such that air (carbon dioxide, CO₂) is trapped in the soda and when it is drank, it gives it its fresh taste
By placing the can of soda on the hot plate, drives off the air in the soda such that the space directly above the liquid soda is filled with the original air (carbon dioxide), in the soda
By dipping the soda upside down in the sink half filled with water, the soda is cooled down and the air (carbon dioxide) directly above the surface of the liquid soda is reabsorbed into the liquid soda, such that if the lid of the soda is sealed, the vacuum created by the empty space directly above the liquid soda becomes a region of low pressure and the combined pressure from the atmosphere and the liquid level in the sink, causes the can to immediately crushed (deformed).
Explanation:
Katie's teacher has given her a sample that contains a mixture of salt, sand, and iron fillings. She is instructed to separate the mixture into the three individual components. What would be the best physical property to focus on for the first step in separating the mixture?
density
electrical conductivity
magnetism
melting point
The best physical property to focus on for the first step in separating the mixture would be magnetism, therefore the correct answer would be option C.
What is a magnetic field?An area where the magnetic force is being applied might be described as a magnetic field. This area could be found around a magnet, magnetic substance, or electric charge.
The magnet's N-pole and S-pole have the strongest magnetic fields for a basic bar magnet. A magnet's north pole serves as the source of the magnetic field, which ends at the south pole.
As given in the problem Katie's teacher has given her a sample that contains a mixture of salt, sand, and iron fillings. She is instructed to separate the mixture into three individual components.
The first step in separating the mixture would be to separate iron fillings with the help of the property of magnetism as iron fillings are the magnetic material. therefore the correct answer would be option C.
Learn more about the magnetic fields from here
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if an organism reproduces quickly, its population can _____ faster
Answer:
Grow
Explanation:
If an organism is reproducing quickly, the population will grow faster
A car is traveling at 120 km/hr. How many hours will it take to cover a distance of 276 km?
answer- 2.3
km/hr 120/1 276/h 276/2.3
The square root by prime factorization 2916
Answer:
2×3×3×3 = 54
So yea this is ur answer
For an object sliding at velocity v with a force of friction Fk and a normal force FNs which equation can be usedto calculate the coefficient of kinetic friction?
Answer:
C.
Explanation:
Apex says so
For an object sliding at velocity v with a force of friction [tex]F[/tex] and a normal force [tex]Fn[/tex] , an equation that can be used to calculate the coefficient of kinetic friction [tex]\mu_k[/tex] is
[tex]\mu_k=\dfrac{F}{Fn}[/tex]
What is Kinetic friction?It is a type of resistive force which comes to play when two contacting surfaces have relative motion with respect to each other.
in general, the coefficient of kinetic friction ([tex]\mu_k[/tex]) is slightly less than the coefficient of static friction([tex]\mu_s[/tex]).
The coefficient of kinetic friction is calculated by the mathematical expression
[tex]\mu_k=\dfrac{F}{Fn}[/tex]
Learn more about kinetic friction
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