A track star runs 100 meters in 10 seconds. What is the star's average speed?
Answer:
10m/s
Explanation:
As shown in the diagram below, a rope attached to a 500.-kilogram crate is used to exert a force of 45 newtons at an angle of 65 degrees above the horizontal. The horizontal component of the force acting on the crate is:
1) 19N
2) 41N
3) 210N
4) 450N
Answer:
19N
Explanation:
Sorry i don’t really know why that’s the answer just that i know thats correct. so what the thing i looked up said
45N(cosine65)= horizontal component
45N(0.423)=19N and that’s the answer
i don’t know where the .423 came from but i hoped i helped :)
Answer: 1
Explanation:
Given
Mass of Crate [tex]m=500\ kg[/tex]
Applied force [tex]F=45\ N[/tex] at an angle of [tex]\theta=65^{\circ}[/tex]
The applied force can be resolved in to two direction i.e. vertical and horizontal direction.
From the figure, horizontal component of the force is [tex]F\cos 65^{\circ}[/tex]
[tex]\Rightarrow F\cos65^{\circ}=45\cos 65^{\circ}\\\\\Rightarrow 19.017\approx 19\ N[/tex]
Thus, the horizontal component of force is [tex]\mathbf{19\ N}[/tex]
learn more: https://brainly.com/question/14133377
Try to explain to someone at home how ovens work to heat pizza, or to heat something. Use language you think will help the person really understand how molecules move as they are heated.
Answer:
The heat is transferred from the metal rod to the pizza dough.
Explanation:
An oven works on electricity. We know that according to the law of conservation of energy, energy is being transferred from one type to some some other type. It is not possible to create or form energy and also to destroy energy.
So in the oven when the oven is switched on to make a pizza, the electrical energy is converted into heat energy which bakes the pizza inside the oven.
When the oven is heated, the molecules inside the metallic rod vibrates and it transfers its kinetic energy to its neighboring atoms. This is how the entire rod gets heated up due to conduction from one point end to another. The heat is then flowed from the rod to the pizza through the surrounding air in the oven. The molecules in contact with the rod transfers the heat to the molecules in the surroundings. This process is called convection process.
This is how the heat is flowed and transferred from the rod to the pizza dough by conduction and convection process. Thus the temperature rises and it heats the pizza.
please help i give brainest but i need help asap
Answer:
Surface
Explanation:
Rayleigh Waves—surface waves that move in an elliptical motion, producing both a vertical and horizontal component of motion in the direction of wave propagation. Particle motion consists of elliptical motions (generally retrograde elliptical) in the vertical plane and parallel to the direction of propagation.
A motorcyclist travelling at 30m/s starts to apply his brake when he is 50m from the traffic light that has just turned red .if he reached the traffic light. what is the deceleration
Matter is made up of very small particles called atoms. Atoms are
Answer:
Matter is made up of very small particles called atoms. Atoms are the basic units of matter and the defining structure of elements.
Hope this helps
Does the shape of a skateboard affect how will travel?
Answer:
Yes
Explanation:
The shape will affect the friction and the way the skateboard moves.
3. 500ml of 60oC water at is added to a beaker. Water’s specific heat is 4.186 J/g °C. You have 40ml of and unknown substance that you add to the same beaker. The unknown substance’s specific heat is 14.3/goC The final temperature of the beaker is 45oC. What was the initial temperature of the unknown substance?
In order to determine the wavelength, you must know the distance from the (2 points)
Select one:
a. trough of one wave to the crest of the next wave
b. midpoint of a wave to the highest point of the next wave
c. crest of the wave to the equilibrium of the same wave
d. the crest of one wave to the crest of the next wave
Answer:
b
Explanation:
Answer:
a
Explanation:
because the crest and trough are the same length when together and they squeeze together making the length shorter for higher frequencies and are spaced apart when lower frequencies occur
If I travel 5m to the left, and then 2m to the right, what is my distance?
What is my displacement
Answer:
distance is 5+2 = 7
displacement is 5-2 = 3
At highway speeds a car can accelerate at 1.7 m/s2.
At this rate how long does it take to accelerate from
23.6 m/s to 27.8 m/s?
Answer: 2.5 seconds
Explanation:
We know that the acceleration is:
a(t) = 1.7 m/s^2
To get the velocity function, we must integrate over time, and we will get:
v(t) = (1.7m/s^2)*t + v0
Where v0 is the initial velocity, in this case, we assume that we start at 23.6m/s, then the initial velocity is:
v0 = 23.6 m/s
Then the velocity equation is:
v(t) = (1.7m/s^2)*t + 23.6 m/s
Now we want to find the value of t such v(t) = 27.8 m/s
Then:
v(t) = 27.8 m/s = (1.7m/s^2)*t + 23.6 m/s
27.8 m/s - 23.6 m/s = (1.7m/s^2)*t
4.2 m/s = (1.7m/s^2)*t
4.2m/s/(1.7m/s^2) = t = 2.5 s
Then at that acceleration, you need 2.5 seconds.
Question 12 (Mandatory) (5 points)
What force is required to accelerate a 6-kg object at a rate of 3.5 m/s^2?
What happens to the particles of a liquid when energy is removed from them?
The motion of the particles increases.
The motion of the particles stays the same.
The distance between the particles increases.
The distance between the particles decreases.
Answer:
the motion of the particles stays the same.
Answer:
The motion of the particles stays the same
Explanation:
hope this helps
(01.01 LC)
Two objects of the same mass are in a room. At which of the
following distances will the greatest gravitational force be exerted
by one object on another?
O 2 m
O 4 m
O 6 m
O 8 m
Answer:
2m
Explanation:
The closer the objects are, the more gravitational force there is
You walk from your bedroom, 25m to the mailbox, and then walk 25m back to your bedroom. What is your total distance? What is your displacement?
Answer:
Distance is 50m
Displacement is 0m
Explanation:
Distance is based on the amount of length you covered, regardless of where you end.
Displacement only considered where you started and where you ended, which is at the same spot in this case. Therefore, no displacement.
A resistor converts 350 J of electrical energy to other forms of energy. What is the amount of
charge that flows through it when a potential difference of 7 V is applied across it?
Answer:
50C
Explanation:
Given parameters:
Electrical energy = 350J
Potential difference = 7V
Unknown:
Amount of charge = ?
Solution:
To solve this problem, use the expression below;
E = q x v
E is the electrical energy
q is the quantity of charge
v is the voltage
Insert the parameters and solve for q;
350 = q x 7
q = [tex]\frac{350}{7}[/tex]
q = 50C
The value of the charge will be 50 C. A charge is something experienced as a force in the electric and megnetic field.
what is the charge?When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. A positive or negative electric charge can exist.
Charges that are similar repel each other, whereas charges that are dissimilar attract each other. The term "neutral" refers to an item that has no net charge.
The given data in the problem is;
e is the electrical energy = 350J
V is the Potential difference = 7V
q is the charge=?
[tex]\rm e = qV \\\\ \rm q=\frac{e}{V} \\\\ \rm q=\frac{350 }{7} \\\\ \rm q= 50 \ C[/tex]
Hence the value of the charge will be 50 C.
To learn more about the charge refer to the link;
https://brainly.com/question/24391667
All of the following statements concerning drugs and supplements are true EXCEPT: A. Many drugs and supplements are ineffective and expensive. B. Many supplements and drugs are frequently used to improve performance and appearance. C. Supplements and drugs both undergo stringent government testing. D. Supplements and drugs can both cause unwanted side effects. Please select the best answer from the choices provided. A B C D
Answer: C, supplements and drugs both undergo stringent government testing.
Explanation: took the unit test.
hope this helps :)
Answer:
C
Explanation:
3. Michelle failed her most recent exam, which has
brought her class grade down to a D. The
semester is ending in 2 weeks and she has 1
assignment and 1 quiz left to make up for the
class. She sets the goal to do well on both so that
those will improve her class grade. Which of the
following SMART goal components is her goal
missing?(This is physical education)
a. The goal is not specific
b. The goal is not important
c. The goal is not relevant
d. The goal is not timely
please help!!!!!!!!!!
Answer:
B (student 1)
Explanation:
...
Question 7 (2 points)
Rachel performed an experiment testing the hours students slept with their
performance on a test. In this experiment, the hours that they slept was the_____ variable, while the grade they got on
the test was the
_____ variable.
help mee pleaseee :)))
Answer:
See the explanation below.
Explanation:
Solving the first image question:
C ) The resulting force is defined by Newton's second law which tells us that the sum of the forces on a body is equal to the product of mass by acceleration. That is, there must be a force that acts on a body to produce an acceleration. If there is no acceleration it is because there are no external forces or developed by the body. And if there is no acceleration the body moves at a constant speed, in a straight line, so the response is C.
For the second image, we must remember that weight is defined as the product of mass by gravitational acceleration.
W = m*g
where:
W = weight [N]
m = mass [kg]
g = gravity acceleration [m/s²]
Now we have
m = 50 [kg]
ge = Earth gravity acceleration = 10 [m/s²]
gp = Distant planet gravity acceleration = 4 [m/s²]
We = ge*m
We = 10*50 = 500 [N]
Wp =gp*m
Wp = 4*50 = 200 [N]
Therefore the answer is D
For the third image, The mass is always going to be preserved, regardless of where the body or object is in space, its weight is the only one that changes since the gravitational force is modified. That is, the mass on the moon and on Earth will always be the same.
m = 70 [kg]
First, we must calculate the acceleration, by means of the following equation of kinematics.
[tex]v_{f} =v_{o} +a*t[/tex]
where:
Vf = final velocity = 20 [m/s]
Vo = initial velocity = 0 (because stars from the rest)
a = acceleration [m/s²]
t = time = 4 [s]
20 = 0 + a*4
20 = 4*a
a = 5 [m/s²]
Now using Newton's second law which tells us that the total force acting on a body is equal to the product of mass by acceleration.
F = m*a
where:
F = force [N] (units of Newtons)
m = mass = 2 [kg]
a = acceleration = 5 [m/s²]
F = 2*5
F = 10 [N]
The body of Figure D, since a total force of 25 [N] to the left acts on it, in the rest of cases the force is zero or much less than 25 [N]
50 + 40 - 35 - 30 = F
F = 25 [N]
pls help i will give u brianliest!
Answer:
it's c
Explanation:
is the one that looks like an example of potassium
I took the test!
WILL GIVE BRAINLIEST!! Please answer
Answer:
B.
Explanation:
Feel free to give brainliest.
Have an outstanding day!
When a25 kg crate is pushed across a frictionless horizontal floor with a force of 200n directed 20°below the horizontal, magnitude of the normal force of the floor on the crate is
Answer:
310N
Explanation:
These are the options for the question
A)68N
B. 68N
C. 180N
D. 250N
the normal force of the floor on the crate can be calculated using below formula
N=W+ Fsin(x)
= mg+ Fsin(x)
m= mass of the crate= 25kg
g= acceleration due to gravity= 9.8m/s^2
We were told a force of 200n directed 20°below the horizontal
Which means angle(x)= 20°
We were given horizontal floor with a force of 200N I.e F= 200N
If we substitute these values into the formula above we have
N=mg+ Fsin(x)
= (25kg×9.8) + 200sin(20)
=313.5N
Hence, the the magnitude of the normal force of the floor on the crate is approximately 310N
CHECK THE ATTACHMENT FOR THE DIAGRAM
What type of light is a glow stick
Answer:
self-contained, short-term light-source
Explanation:
A child kicks a ball with an initial velocity of 8.5 meters per second at an angle of 35.00 degrees above the horizontal. The ball has an initial vertical velocity of 4.9 meters per second and a total time of flight of 1.0 second. The horizontal component of the ball's initial velocity is approximately
Answer:
6.96 m/s
Explanation:
Horizontal component = V cos α
V= initial velocity of the ball= 8.5 m/s
α = 35°
Horizontal component = 8.5 cos35 = 6.96 m/s
Therefore, the horizontal component of the balls initial velocity is 6.96 m/s
This question involves the concepts of projectile motion, Pythagora's theorem, and the horizontal and vertical components of velocity.
The horizontal component of the ball's initial velocity is "6.94 m/s".
This is an example of a projectile motion with both the horizontal and vertical components of the velocity. The resultant velocity, in this case, can be found using Pythagora's theorem.
[tex]v^2=v_x^2+v_y2[/tex]
where,
v = resultant speed = 8.5 m/s
vx = horizontal component of speed = ?
vy = vertical component of speed = 4.9 m/s
Therefore,
[tex](8.5\ m/s)^2=v_x^2+(4.9\ m/s)^2\\\\v_x=\sqrt{(8.5\ m/s)^2-(4.9\ m/s)^2}\\\\v_x=6.94\ m/s[/tex]
Learn more about Pythagora's Theorem here:
https://brainly.com/question/343682?referrer=searchResults
The attached picture shows the Pythagora's theorem.
A coin was flipped in the air and reached a maximum height of 1.5 meters. What was the initial velocity? How long was the coin in the air? Ignore air resistance.
Answer:
Vi = 5.42 [m/s]
t = 0.55 [s]
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]v_{f} ^{2} =v_{o} ^{2} -(2*g*y)[/tex]
where:
Vf = final velocity = 0 (At maximum elevation the coin doesn't move)
Vi = initial velocity [m/s]
g = gravity acceleration = 9.81 [m/s²]
y = elevation = 1.5 [m]
Note: The negative sign in the above equation means that the direction of the gravity acceleration is acting against the movement of the coin when it is going up.
0 = (Vi)² - (2*9.81*1.5)
29.43 = (Vi)²
Vi = 5.42 [m/s]
The time we can find it using the next equation also from kinematics.
[tex]v_{f} =v_{i} -g*t\\[/tex]
0 = 5.42 - 9.81*t
t = 5.42/9.81
t = 0.55 [s]
Answer:
Vi = 5.42 [m/s]
t = 0.55 [s]
Explanation:
To solve this problem we must use the following equation of kinematics.
where:
Vf = final velocity = 0 (At maximum elevation the coin doesn't move)
Vi = initial velocity [m/s]
g = gravity acceleration = 9.81 [m/s²]
y = elevation = 1.5 [m]
Note: The negative sign in the above equation means that the direction of the gravity acceleration is acting against the movement of the coin when it is going up.
0 = (Vi)² - (2*9.81*1.5)
29.43 = (Vi)²
Vi = 5.42 [m/s]
The time we can find it using the next equation also from kinematics.
0 = 5.42 - 9.81*t
t = 5.42/9.81
t = 0.55 [s]
Explanation:
Hi Kema :3
What safety factors should astronauts be aware of when collecting rock samples on the Moon?
Answer:
Explanation:
Astronauts face a wide range of dangers when maneuvering in space. Collecting rock samples requires breaking apart rocks on the moon's surface, which requires tools. These tools are sometimes small hammers or other times special drills. All of this process means moving and using force to break these rocks apart and every single movement can cause a mistake which can lead to a piece of the suit ripping or a failure in the machinery. Since there is no oxygen on the moon the tiniest failure in the suit can lead to the death of the astronaut. Therefore, having backup safety precautions, and quick repair scenarios is a must when collecting rock samples on the moon.
What net force is necessary to keep a 1.0 kg puck moving in a circle of radius 0.5 m on a horizontal frictionless surface with a speed of 2.0 m/s?
Answer:
8.0 N
Explanation:
How are the direction of the net force on an object and the direction of the object’s acceleration related?
They're the same direction.