Which of the following is true about the speed of light? (2 points)
Answer:
It is a constant when the light is traveling in a vacuum.
16. Through which of the following mediums is the velocity of a sound wave the greatest?
A. Steel
B. Lend
Water
D. Air
A.) Steel.
steel travels 5,060 meters per second,
lead travels 1,402 meters per second,
water travels 1,439 meters per second,
and air depends on temperature.
If a bicyclist travels 25 km/h, how long will it take her to travel 40 km?
Answer: 1.6 hours
Explanation: 40/1.6 = 25
A skier rides horizontally off of a 200 meter high cliff. If he lands 25 meters away from
the base of the cliff, how fast was he skiing as he went off the edge?
Answer:3.91
Explanation:
Can someone help me with these questions please. I will mark brainliest
Answer:
3: I can´t see the text/image, but it depend on the mass and the force applied to the ball, if both are too high, it will be harder to make a home run. (Second law)
4:It would be easier to make a home run because there is no interruption between the ball and the space the same travels. (Third law)
Explanation:
An object travels in a straight line for 1200 m at a velocity of 50 m/s, what is its time of travel?
Given that,
distance = d = 1200m
velocity/speed = s = 50m/s
time = t
Also,
s = d/t
And,
t = d/s
t = 1200/50
t = 120/5
t = 24
Therefore, it takes 24s to travel.
Answer: Therefore, the travel time of a car that travels 1200 meters at 50 m/s is 24 seconds.
Explanation:
An object travels in a straight line for 1200 m at a velocity of 50 m/s, what is its time of travel?
Data:
d = 1200 m
V = 50 m/s
t = ?
The formula for uniform motion is:
V = d/tWhere
V = speedd = distancet = timeWe clear the formula for time t:
t = d/v
t = (1200 m)/(50 m/s)
t = 24 s
Therefore, the travel time of a car that travels 1200 meters at 50 m/s is 24 seconds.
A ball thrown vertically upward reaches a maximum height of 30 meters above the surface of Earth. At its maximum height, the speed of the ball is
Answer:
0 m/s
Explanation:
In this problem,
A ball thrown vertically upward reaches a maximum height of 30 meters above the surface of Earth. We need to find the speed of the ball at the maximum height. When an object reaches its maximum height, after then it starts to decrease its speed. As a result, the speed of the ball will be equal to 0 m/s.
The speed of the ball thrown upwards is zero when the object reaches maximum height.
The given parameter:
maximum height, h = 30 mThe velocity of an object thrown upwards decreases with time because the object is moving against gravity, and the eventually becomes zero when the object reaches maximum height.
[tex]v_f = v_0 - gt= 0[/tex]
Thus, the speed of the ball thrown upwards is zero when the object reaches maximum height.
Learn more here:https://brainly.com/question/10693605
A boxer hits punching bag and gives it a change in momentum of 12 kg multiplied by m divided by s over 7.0ms what is the magnitude of the net force on the punching bag
Answer: 1700
Explanation:
A force of 25 newtons moves a box a distance of 4 meters in 5 seconds.
The work done on the box is [___] Nm, and the power is [___] Nm/s.
h e l p
Answer:
100 Nm and 25Nm/s.
Explanation:
Given the following data;
Force = 25N
Distance = 4m
Time = 5secs
To find the workdone;
Workdone = force * distance
Substituting into the equation, we have;
Workdone = 25*4
Workdone = 100 Nm
To find the power consumed;
Power = workdone/time
Substituting into the equation, we have;
Power = 100/4
Power = 25Nm/s
The work done on the box is 100 Nm, and the power is 25 Nm/s.
1. What is the gravitational force of attraction between two 800 kg spherical objects that are 5 m apart? What would the gravitational force of attraction between these two objects be if the distance between them was changed to 10 m?
Answer:
the force of gravity between them is quadrupled .
Explanation:
Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces.
Gamma rays are given out from the
of radioactive atoms. What one word completes the sentence??
Gamma rays are given out by the nucleus of certain radioactive materials. Radioactive material ray causes harm to the human beings and environment.
What is gamma-decay?Gamma decay is the production of extremely high-frequency electromagnetic radiation in order to stabilize the unstable nucleus. You must be well-versed in the various energy levels found in an atom.
The Nucleus has its own amount of energy. Gamma decay is the nucleus' method of transitioning from a higher energy level to a lower energy level by emitting high energy photons.
Gamma rays are given out by the nucleus of certain radioactive materials.
Hence, nucleus is the right answer for the blank.
To learn more about the gamma decay, refer to the link;
https://brainly.com/question/25455333
#SPJ2
I need the answer ASAP!
How does the Newton’s Law relate to the force of gravity
Answer:
Newton's second law of motion states that the acceleration of a system is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to its mass. If the only force acting on an object is due to gravity, the object is in free fall.
Explanation:
Hope this helps :)
The free-body diagram below shows the forces acting on a bicycle as the
rider pedals to the right. The vectors are not drawn to scale. The bicycle has a
weight of 700 N and a pedaling force of 325 N. As it moves, it encounters 100
N of air resistance. What is the net force on the bicycle in the x-direction?
Answer:
225 N to the right
Explanation:
got it wrong on the quiz and revealed the correct answer
What does Radioactivity mean?
Answer:
Radioactivity means: the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
Explanation: I hope this helps! :)
Answer:
sending out harmful radiation caused when the nuclei (=central parts) of atoms are broken up.
The whale shark is the largest of all fish and can have the mass of three adult
elephants. Suppose that a crane is lifting a whale shark into a tank for delivery
to an aquarium. The crane must exert an unbalanced force of 2.5 x 104 N to
lift the shark from rest. If the shark's acceleration while being lifted equals
1.25 m/s², what is the shark's mass?
Answer:
m = 20,000 kg
Explanation:
Force, [tex]F=2.5\times 10^4\ N[/tex]
Acceleration of the shark, [tex]a=1.25\ m/s^2[/tex]
It is required to find the mass of the shark. Let m is the mass. Using second law of motion to find it as follows :
F = ma
Putting the value of F and a to find m
[tex]m=\dfrac{F}{a}\\\\m=\dfrac{2.5\times 10^4}{1.25}\\\\m=20,000\ kg[/tex]
So, the shark's mass is 20,000 kg.
Which is the best description of a balanced diet?[food pyramid]
A. A vegetarian diet that includes no meat
B. A diet that consists of fewer than 2,000 calories per day
C. A diet that includes a wide variety of nutritious foods
D. A diet in which you eat at most three times a day
Answer:
A vegetarian diet that includes no meet is the best description of a balanced diet
Answer:
I should be B
Explanation:
extra characters lolhrhhdhfhdjdbfjsjf
A race car with a 255 hp (1.90 × 105 W) engine is able to accelerate from rest to its top speed in 9.00 s. How much work does the car's engine do in this interval of time?
Answer:
W = 1710 kJ
Explanation:
Given that,
Power of a race car, P = 255 hP = [tex]1.9\times 10^5\ W[/tex]
It accelerate from rest to its top speed in 9.00 s.
We need to find the work does the car's engine do in this interval of time.
Power is given by work done per unit time. Mathematically,
[tex]P=\dfrac{W}{t}\\\\W=P\times t\\\\W=1.9\times 10^5\times 9\\\\W=1710\ kJ[/tex]
So, the required work done is is 1710 kJ.
A person walks 8 m/s towards the north. Is this an example of speed or velocity? Explain your answer.
Answer:
I think it is velocity.
because velocity shows the direction and magnitude .
Answer:
Velocity
Explanation:
This is a case of velocity, since velocity apart from having magnitude also has direction. the person walks at 8 [m/s] to the North.
When we talk about speed, we only talk about the magnitude without taking into account the direction.
In a classic experiment, a ball (Ball 1) is dropped from a specific height. At the same
time, an identical ball (Ball 2) is launched horizontally from the same height. Which
ball hits the ground first?
A.) The dropped ball (Ball 1) because its path is shorter,
B.) The launched ball(Ball 2) because the ball's velocity is greater.
C.) The two balls will reach the ground at the same time because the horizontal and vertical planes of motion are independent of each other and they were also released from the same height.
D.) It is not possible to determine which ball hits the ground first because of the complex nature of motion
Answer: C
Explanation:
Gravity is acting equally on both objects causing the same vertical velocity because they are the same objects. The object launched horizontally off a cliff has a longer range because of the greater initial horizontal velocity
Hope this helps you, sweetie!
If you ever need help ask people here on Brainly or contact me by my mail at
tutorbydemand05 at g****.com
Have a marvelous day! {:0)
The answer to the question related to the time for two balls to reach the ground is option C, the two balls will reach the ground at the same time because the horizontal and vertical planes of motion are independent of each other, and they are also released from the same height.
When a ball is dropped, knowing the height we could find the time with the following equation:
[tex] y_{f} = y_{i} + v_{i_{y}}t - \frac{1}{2}gt^{2} [/tex] (1)
Where:
[tex] y_{f} [/tex]: is the final height
[tex] y_{i} [/tex]: is the initial height
[tex]v_{i_{y}}[/tex]: is the initial speed of the ball in the vertical direction = 0 (it is dropped)
g: is the acceleration due to gravity
When the ball is launched horizontally from the same height, we could find the time with equation (1) since the acceleration in the horizontal direction is zero and the initial velocity in the vertical direction is also zero.
The horizontal motion is related to the equation:
[tex] x = v_{i_{x}}*t [/tex] (2)
We can notice in both cases that the ball is accelerated only by gravity.
Let's evaluate each statement
A) This statement is incorrect because the path is the same for both cases. The ball is dropped and launched from the same height.
B) This statement is also incorrect. The velocity of the dropped ball is the same as the velocity of the launched ball because the ball is accelerated only by gravity.
C) This statement is correct. We can see that we would get the same time in equation (1) since [tex]v_{i_{y}}[/tex], [tex]y_{f}[/tex], and [tex]y_{i}[/tex] is the same for the dropped ball and the launched ball.
D) This statement is incorrect. The nature of motion is related to a freefall motion in both cases.
Therefore, the answer is option C.
Read more here:
https://brainly.com/question/10555700?referrer=searchResults
https://brainly.com/question/478240?referrer=searchResults
I hope it helps you!
If you're not satisfied with your fitness evaluation score, there's really little you can do about it.
Answer:
False
Explanation:
Answer:
false
Explanation:
you can improve your score next time
- A type of elevator called a cage is used to raise and lower miners in a mine
shaft. Suppose the cage carries a group of miners down the shaft. If the
unbalanced force on the cage is 60.0 N, and the mass of the loaded cage is
1.50 10 kg, what is the acceleration of the cage?
The unit of the electric resistance is ???
Answer:
OhmsStep-by-step-explanation :
Electric resistance
Dimension length :
Squared mass per time cubed , that is , electric current squared.
The SI derived unit of electric resistance is the ohm,(volt per ampere).
Dose the atoms in a solid move freely or remain in a fixed position ?
Please explain
A 50-kg person is in an elevator. Determine the normal force exerted on the person by the elevator, if the elevator is accelerating downwards at 5 m/s^2.
a train moving at a speed of 15 m/s is accelerated to 45 m/s over a 12 s period. what is the acceleration?
Answer:
2.5 m/s²
Explanation:
Given:
v₀ = 15 m/s
v = 45 m/s
t = 12 s
Find: a
a = (v − v₀) / t
a = (45 m/s − 15 m/s) / 12 s
a = 2.5 m/s²
(03.07 MC)
A 660 kg car is travelling around a circular track of radius 55.0 m at 11.5 m/s.
Calculate the force and its direction that provides the centripetal force acting on the car to keep it
in the circular path. (3 points)
a) 24 N toward the center of the circle
b) 24 N along the line tangent to the circle
c) 1.587 E3 N along the line tangent to the circle
d) 1.587 E3 N toward the center of the circle
Answer: D) 1.587 E3 N toward the center of the circle
This is the same as saying 1.587*10^3 newtons, or we can say 1587 newtons
=================================================
Work Shown:
m = mass = 660 kilograms
v = velocity = 11.5 meters per second
r = radius of circle = 55.0 meters
-------------
F = centripetal force = inward pulling force toward center of circle
F = (m*v^2)/r
F = (660*11.5^2)/55
F = 1587
F = 1.587 * 10^3
F = 1.587 E 3
The "E 3" notation is what many calculators display scientific notation to be
The units for the force here are in newtons.
The force is pulling on the object toward the center of the circle, which helps keep the car on the circular path, rather than it going off on a tangent.
a measuring cylinder contains 30cm3 of a liquid some more of the liquid is added until the liquid level reaches the 50cm3 mark the reading on the balance increases by 30g what is the density of liquid?
Answer:
1.5g/cm³
Explanation:
Given parameters:
Initial volume of the liquid = 30cm³
Final volume of the liquid = 50cm³
Mass of the liquid = 30g
Unknown:
Density of the liquid = ?
Solution:
Density is the mass per unit volume of a substance.
Density = [tex]\frac{mass}{volume}[/tex]
volume of the liquid = final volume - initial volume = 50cm³ - 30cm³
volume of the liquid = 20cm³
Density = [tex]\frac{30}{20}[/tex] = 1.5g/cm³
A train traveling at 48 m/s begins to slow down as it approaches a bend in the tracks. If it travels around the bend at a speed of 14 m/s, and it takes 40 seconds to properly slow down, what is the acceleration acting on the train during this time?
Please help 5 minutes left please!,
Answer:
Acceleration is (48-14)/40 m/s² = 34/40 m/s² = 0.85 m/s²
The acceleration acting on the train during this time of travel is 0.85m/s²
HOW TO CALCULATE ACCELERATION:
The acceleration of a moving body can be calculated by using the formula below:a = (v - u)/tWhere;
a = acceleration (m/s²)v = final velocity (m/s)u = initial velocity (m/s)t = time (s)According to this question, a = ?, v = 48m/s, u = 14m/s, t = 40s.a = (48 - 14)/40a = 34/40a = 0.85m/s²Therefore, the acceleration acting on the train during this time of travel is 0.85m/s².Learn more at: https://brainly.com/question/2040396?referrer=searchResults
Please help me on due today
A personal enrichment goal is related to your life outside the classroom. You might set a goal to read every day or take on a new challenge in an extracurricular team, sport, or activity.
Your completed portfolio will demonstrate how you worked to achieve your stated goals.
• Step 1: Decide what you want to achieve.
• Step 2: Set your goal.
• Step 3: Decide what actions you need to take to reach your goal.
• Step 4: Set a time frame.
• Step 5: Think about your assets and obstacles.
Subject-Matter Achievement Goal
1. My subject-matter achievement goal is:
Answer:
2. My action steps are:
Answer:
3. My time frame is:
Answer:
4. Assets and Strengths:
Answer:
5. Motivation:
Answer:
6. Obstacles:
Answer:
7. Solutions:
Answer:
Study/Organizational Skills Goal
8. My study/organizational skills goal is:
Answer:
9. My action steps are:
Answer:
10. My time frame is:
Answer:
11. Assets and Strengths:
Answer:
12. Motivation:
Answer:
13. Obstacles:
Answer:
14. Solutions:
Answer:
Personal Enrichment Goal
15. My personal enrichment goal is:
Answer:
16. My action steps are:
Answer:
17. My time frame is:
Answer:
18. Assets and Strengths:
Answer:
19. Motivation:
Answer:
20. Obstacles:
Answer:
21. Solutions:
Answer:
Subject-Matter Achievement Goal
1. My subject-matter achievement goal is:
Answer: Read 1 full chapter book in 1 week
2. My action steps are:
Answer: Read an equal amount of chapters every day for a week
3. My time frame is:
Answer: 1 week
4. Assets and Strengths:
Answer: ability to focus,
5. Motivation:
Answer: Great interest in the book I chose
6. Obstacles:
Answer: Might lose page number, forget where I am at in the book, forget to read one day
7. Solutions:
Answer: Get or make a bookmark, keep a personal reading log, set alarm for a certain time each day
Study/Organizational Skills Goal
8. My study/organizational skills goal is:
Answer: manage my time better
9. My action steps are:
Answer: planning things out to be more organized
10. My time frame is:
Answer: from now to the end of the school year
11. Assets and Strengths:
Answer: a planner so I can pace myself
12. Motivation:
Answer: give breaks and take time to do things I enjoy
13. Obstacles:
Answer: leaving things last minute
14. Solutions:
Answer: planning to do certain things before a certain day
This can be for any of those goals
Personal Enrichment Goal
15. My personal enrichment goal is:
Answer: Stay healthy
16. My action steps are:
Answer: eat healthier foods
17. My time frame is:
Answer: now to the end of the school year
18. Assets and Strengths:
Answer: I don't make a big deal out of eating veggies and stuff
19. Motivation:
Answer: treat myself every so often
20. Obstacles:
Answer: Craving junk food
21. Solutions:
Answer: find a way to make healthier foods taste similar to junk food (EX. Put cheese on broccoli)
pls help me tbis is being timed
Answer:
it would have to be 1000 netons