Answer:
its c i just did the test
Explanation:
A 60-kg skate boarder is standing on his stationary board. A bigger, out of control 75-kg skate boarder crashes into him with a velocity of 4 m/s. Their boards get stuck together in this inelastic collision. How fast are the moving after the collision?
Answer:
2.22m/s
Explanation:
Given parameters:
M1 = 60kg
M2 = 75kg
V1 = 0m/s
V2 = 4m/s
Unknown;
Velocity after collision = ?
Solution:
To solve this problem, we must understand that the momentum before and after collision of the bodies must be the same;
M1 V1 + M2 V2 = v(M1 + M2)
So;
60 x 0 + 75 x 4 = v (60 +75)
300 = 135v
v = 2.22m/s
What is the speed of a baseball that travels 49 meters in 2.8 seconds?
(I will mark first answer Brainliest!)
Answer:
49 meter per second is the speed of the baseball
Explanation:
thank me later
A planet with half Earth’s mass and half Earth’s radius is discovered. What would an astronaut who weighs 800 N on Earth weigh on the planet?
Let,
The mass of planet, [tex]M' = \frac{1}{2} M_\bigoplus[/tex]The radius of planet, [tex]R = \frac{1}{2} R_\bigoplus[/tex]here,
[tex]M_\bigoplus[/tex] = Mass of earth[tex]R_\bigoplus[/tex] = Radius of earthNow,
The gravitational acceleration of the planet will be:
→ [tex]g' = \frac{GM'}{R^2}[/tex]
[tex]= \frac{2G M_\bigoplus }{R_\bigoplus ^2}[/tex]
[tex]= 2g[/tex]
hence,
The weight will be:
= [tex]2\times 800[/tex]
= [tex]1600 \ N[/tex]
Thus the above answer is appropriate.
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Which of the following would have the least impact on physical health?
o communicating well with others
getting plenty of rest
taking part in regular physical activity
O making responsible choices
A horse pulls a wagon that weighs 10 times more than the horse. The horse pulls with a force of 500N to move the wagon forward. How much force does the wagon exert on the horse? *
a. More than 500N
b. It depends on the size of the horse
c. Less than 500N
d. 0N because a wagon cannot exert a force
e. 0N because the wagon is moving
f. 500N
Answer:
f. 500N
Explanation:
The force exerted by the wagon on the horse is 500N directed in the opposite path .
This is premised on the Newton's third law of motion which states that "action and reaction forces are equal and opposite in direction".
So, as the action force of 500N is used by the horse to drag the wagon, the wagon also exerts an oppositely directed force of 500N on the horse.
This way, the acceleration can continue.
A 2000 Kg car is driving 15 m/s. It drives head-on into a giant spring attached
to a brick wall. The spring compresses 8 meters after the impact. What is the
spring coefficient of the giant spring? *
Answer:
The spring constant is k=7031.25
Explanation:
We start by using the conservation of mechanical energy:
Ui + Ki = Uf + Kf
the Ui (initial potential energy) is zero since the spring is relaxed.
In the final situation, the Kf (final kinetic energy is zero since the car and spring are NOT in motion)
Then we have:
[tex]K_i=U_f\\\frac{1}{2} m*v^2=\frac{1}{2} k*(\Delta x)^2\\\frac{1}{2} 2000*15^2=\frac{1}{2} k*(8)^2\\k=7031.25[/tex]
An apple falls off a roof .It takes the apple 15.7 seconds to hit the floor . How far did the apple fall?
Answer:
8.83m below I hope I got it
A book is sitting on a desk. If the surface area of the book's cover is 0.05 m², and atmospheric pressure is 100.0 kPa, what is the downward force of the atmosphere on the book
Answer:
5000N
Explanation:
Given parameters:
Area of the book cover = 0.05m²
Atmospheric pressure = 100kPa = 100 x 10³Pa
Unknown:
Downward force of the atmosphere on the book = ?
Solution:
Pressure is defined as the force per unit area on a body.
So;
Downward force = Atmospheric pressure x Area
Downward force = 100 x 10³ x 0.05 = 5000N
Which does NOT affect how much a building shakes in an earthquake?
*If it is on soft sediment or hard rock.
*How close it is to the fault.
*If it is in a valley or on a hill.
*The weather.
*How the building is constructed.
Which descriptions apply to Mendels pea plant experiments ? Select three options
used cross breeding to purposely breed plan
studied a variety of pea plant traits
studied several generations of plants
In order to breed or cross one plant with another, Mendel opened the petals and removed the anthers from the flower and dusted the pistil with pollen from the plant he wished to cross it with and covered the flower with a small bag to prevent the pollen in the air from landing in the pistil. This process is called cross pollination.
Mendel considered 7 characters of pea plant for his study and did the study for several generations.
If an object is not moving, does that mean there are no forces acting up on it? Why or why not?
Answer:
If an object is at rest, then there are no forces acting upon the object.
Explanation:
It would take an unbalanced force to keep an object in motion at a constant velocity. It is the natural tendency of all objects to eventually come to a rest position.
Help plz I’ll mark brainliest
Answer:
concave
Explanation:
the middle of the concave lens is narrow and the edges are flattened.
explain the law of conversion of energy with an example and explain it
Energy can neither be created nor destroyed. It can be converted from one form to another. The total energy before and after conversion remains the same. The Law of Conservation of Energy is universal.
The law of energy conservation says that energy can be transformed from one type to another type, for example, if a ball is thrown upward the kinetic energy as the ball goes upward decreases, and the potential energy increases.
What is the conversion of energy?Energy conversion is the process by which energy is changed from forms supplied by nature to forms used by people.
For this goal, a huge variety of tools and systems have been created over the years. A few of these energy converters are really straightforward. Early windmills, for instance, used wind's kinetic energy to drive machinery that pumped water and ground grain.
A body's kinetic energy was thought to be transformed into potential energy as it slowed down while moving upward against the pull of gravity.
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Classify the following situations into contact and non-contact forces.
(a) Applying brakes in a vehicle
(b) a coconut falling from a coconut tree
(c ) the planets revolving around the sun
(d) a ball is rolling on ground.
Answer: Contact force
a. Applying break in a vehicle.
d. The speed of ball rolling on ground is reduced
Non contact force
b. A coconut falling from a coconut tree.
c. The planets revolving around the sun.
Explanation:
The contact force is the force which exerts when one object or entity comes in contact with other object or entity. For example, on application of break the vehicle stops, the force is applied on the breaks to stop the vehicle. The ball rolling on the ground the speed reduces so the application of force on the ground also reduces.
The non contact force is the force one object exerts on the other without coming in direct contact with the other object. The force exerted by one object on other due to gravity is a non contact force. The coconut falling on the ground and planets revolving around the sun are examples of non contact force due to gravity.
How does the force of the car change as the mass of the car is increased?
yes
Explanation:
because if a car is 100 pounds then it will have less force than a 250 pound car
Question 6 / 6
When you visited that last website, there were two animations. What was the unbalanced force in the animation with the skateboarder?
A. The skateboard
B. The rock in the road
C. The skateboarder
Hey, I need help can someone help me out, please?
Explanation:
6) newton
7) f =ma = 15*15 = 225N
8) a= 100/20 = 5ms^-2
Answer:
6 newton
7) f =ma = 15*15 = 225N
8) a= 100/20 = 5ms^-2
Explanation:
this is right pls mark as brainliest
As wavelength increase, the frequency of the wave increases / decreases.
Answer:
Hey heres your ans
Explanation:
Wavelength will increase
Tq
An airplanes velocity has an x-component of -155 mph and a y-component of -45 mph. What are the magnitude and direction of the plane's velocity
Answer:
161.4 mph due southwest
What is the momentum of a 1.5 * 10 ^ 3 - kil kilogram car as it travels at 30. meters per second due east for 60. seconds ?
Answer:
45000kgm/s due east
Explanation:
Given parameters:
Mass of the car = 1.5 x 10³kg
Velocity = 30m/s
Time taken = 60s
Unknown:
Momentum = ?
Solution:
Momentum is the quantity of motion a body possess,
Momentum = mass x velocity
So;
Momentum = 1.5 x 10³ x 30 = 45000kgm/s due east
if the police are chasing a runaway car why is knowing the velocity of the car important
If you only know its speed, that's not enough information to catch it. You could even chase it at DOUBLE that speed, and you'd never catch it if you were chasing in the wrong direction.
You also have to know the DIRECTION the runaway car is going, so that you can chase in the same direction.
Now that you know its speed AND direction, you know its velocity. You need that information to have any chance of catching it.
How is a coil of current carrying wire similar to a bar magnet
Answer:
When an electric current flows, the shape of the magnetic field is very similar to the field of a bar magnet
Explanation:
can somewon help me with this qustion?
How is an object’s position in the solar system affect its motion and temperature?
Answer:
it will be base on the climate change.
Explanation: so let just say tomorrow it will be cold so the atmosphere will circle on the coolest atmosphere away from the sun.
An object's position in the solar system affects both its motion and temperature. Objects closer to the Sun experience a stronger gravitational force, causing faster or slower orbits. Other planets and moons also influence an object's orbit and speed. Objects closer to the Sun receive more solar radiation and are hotter, while those farther away receive less radiation and are colder. Additionally, the composition of an object's surface can affect its temperature.
What is the solar system?The solar system refers to the group of celestial bodies that orbit around the Sun, including planets, dwarf planets, moons, asteroids, comets, and other small bodies. It is located in the Milky Way galaxy and spans a distance of about 4.6 billion years in age. The eight planets in the solar system, in order from the Sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The solar system is held together by the gravitational force of the Sun and is a subject of scientific study to understand the formation and evolution of our own planet and the other bodies in the solar system.
Here in the Question,
An object's position in the solar system can affect both its motion and temperature. Here's how:
Motion: The motion of an object in the solar system is affected by its distance from the Sun and the gravitational forces of other celestial bodies. An object closer to the Sun will experience a stronger gravitational force than an object farther away. This can cause the object's orbit to be faster or slower depending on its position. Additionally, the gravitational pull of other planets and moons can affect the object's orbit and speed.
Temperature: An object's temperature in the solar system is affected by its distance from the Sun and the composition of its surface. Objects closer to the Sun receive more solar radiation and thus have a higher temperature. Objects farther away receive less radiation and are colder. Additionally, the composition of the object's surface can affect its temperature. For example, objects with high albedo (reflectivity) will reflect more solar radiation and have a lower temperature than objects with low albedo.
Therefore, an object's position in the solar system has a significant impact on its motion and temperature. By studying the positions of celestial bodies and their effects on each other, scientists can gain a better understanding of the dynamics of the solar system and the properties of objects within it.
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A 5Kg ball rolling to the right at a velocity of 5m/s hits a stationary 10Kg ball. It is an elastic collision and the final velocity of the 5Kg ball is 0m/s. What is the final velocity of the 10Kg ball?
Answer:
magnitude of v = 2.5 m/s, and in the same direction as the initial velocity of the 5 kg ball.
Explanation:
We use conservation of linear momentum in an elastic collision to solve for the unknown velocity v:
Pi = Pf
5 kg * 5 m/s + 10 kg * 0 m/s = 5 kg * 0 m/s + 10 kg * v
25 kg m/s = 10 kg * v
v = 25/10 m/s
v = 2.5 m/s
and in the same direction as the initial velocity of the 5 kg ball.
Tell me what the
forces are.
PLZ LOOK AT THE PHOTO AND TELL ME THE ACTION AND REACTION FORCES ASAP
WILL MARK BRAINLIEST
Answer:
upward thrust, makes the rocket go up
and kentic energy, you swing and the energy that was built up before you hit the ball was transferred
Explanation:
What are some ways to deal with stress? HELP
Answer:
dear the other side is the hardich the value that indicates that the other hand if one of triangle ABC news and information or have any further information on the value of x the ki friend my dear the ki aadami you are girl or by phone
Answer:
play games
do meditation
take a long breath
be calm and relax
share your stress
get help from elders
What centripetal force is needed to keep a 7kg mass moving in a circle of 4 meters radius at 15m/s
Answer:
We conclude that the centripetal force needed to keep a 7kg mass moving in a circle of 4 meters radius at 15m/s is 393.75 N.
Explanation:
Given
Mass m = 7 kgRadius r = 4 mVelocity v = 15m/sTo determine
We need to determine the centripetal force needed to keep a 7kg mass moving in a circle of 4 meters radius at 15m/s.
We know a centripetal force acts on a body to keep it moving along a curved path.
We can determine the centripetal force using the formula
[tex]F_c=\frac{mv^2}{r}[/tex]
where
[tex]m[/tex] is the mass[tex]v[/tex] is the velocity[tex]r[/tex] is the radius[tex]F_c[/tex] is the centripetal forcesubstitute m = 7, r = 4, and v = 15 in the formula
[tex]F_c=\frac{mv^2}{r}[/tex]
[tex]F_c=\frac{7\left(15\right)^2}{4}[/tex]
[tex]F_c=\frac{1575}{4}[/tex]
[tex]F_c=393.75[/tex] N
Therefore, we conclude that the centripetal force needed to keep a 7kg mass moving in a circle of 4 meters radius at 15m/s is 393.75 N.
2) A bully is pushing a boy against a locker as shown with a force of
500N. The angle between his arms and the ground is 40°. Draw a free-body diagram of
the boy and then find the normal force between the boy and the wall.
HELP
Answer:
pull out the 9
Explanation:
Which of these should be avoided in order to prevent heart diseases and disorders?
yoga and meditation
fruits and vegetables
drugs and alcohol
jogging and skating
Answer:
drugs and alcohol
Explanation:
All the others will help your body, while drugs and alcohol will only harm it .
Answer:
drugs and alcohol
Explanation:
because drugs and alchol isnt healty for your body and it causes diseases .