Answer:
120
Explanation:
1h=80
0.5h=40
1h+0.5h=80+40
=120
1. Why did Asteroid 2019 OK cause concern among scientists? * The asteroid was not detected until it was extremely close to Earth. It's the largest known near-Earth asteroid ever discovered. The asteroid's path was aimed directly at the moon. The asteroid was too large to be deflected away from Earth
Answer:
The asteroid was not detected until it was extremely close to Earth.
Explanation:
According to data from NASA, the Asteroid named 'Astriod 2019 OK', was detected when it was extremely close to earth with just about an estimated distance of 73,000 kilometers (45,000 miles) from the Earth.
Scientists were concerned at the proximity of this space object to the Earth before it was discovered, and it brought about a cause of concern that since it was not extremely large (estimated 57 to 130 meters wide) it creates a potential for other smaller asteroids to escape detection and struck the earth.
plz help meh and explain how to do it i suck at physics...
The variables with the subscript "i" refer to the initial masses (m) and velocities (v) of the shark and fish.
[tex]m_{1,i}[/tex] = 10 kg
[tex]m_{2,i}[/tex] = 0.5 kg
[tex]v_{1,i}[/tex] = 5 m/s
[tex]v_{2,i}[/tex] = 0 m/s
The variables with "f" refer to the final masses and velocities. Use the law of conservation of momentum to calculate these. The law says that the total momentum of the shark and fish before the fish is eaten should be equal to the momentum after the fish is eaten. We have
[tex]m_1v_1[/tex] = (10 kg) (5 m/s) = 50 kg • m/s
[tex]m_2v_2[/tex] = (0.5 kg) (0 m/s) = 0 kg • m/s
so the total momentum before the fish gets eaten is 50 kg • m/s.
When the shark eats the fish, its mass increases by 0.5 kg. So
[tex]m_{1,f}v_{1,f}[/tex] = (10.5 kg) [tex]v_{1,f}[/tex] = 50 kg • m/s
Solve for [tex]v_{1,f}[/tex] by dividing both sides by 50.5 kg to get
[tex]v_{1,f}[/tex] = (50 kg • m/s) / (50.5 kg) ≈ 4.76 m/s
You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?
Answer:
By watching in the door lock
Answer:
.-. you can flip a switch and look at the bottom or the top of the door and see if there’s a light of there isn’t then flip another one.
also the other chat that we were talking on got deleted
An object's movement around an internal axis is _____.
Answer:
brooo it is rotation .............
A block is placed on an inclined plane and remains stationary, as shown in the figure above. A student claims, “The block remains stationary because as gravity tries to pull the block down the ramp, the block exerts an equal and opposite force on itself up the ramp.” Is the student’s claim correct? Justify your answer.
Answer:
No, according to Newton's first law of motion, the block cannot exert a force on itself, and the body will remain at rest unless unbalanced forces act on it
However according to Newton's third and first laws of motion the action of gravity pulling the block down the plane is equal to the reaction force of friction, preventing the motion
Explanation:
According to Newton's third law, the action force of gravity on the block tending to drag the block down along the inclined plane is equal to the reaction force of the frictional force of the inclined plane due to the interactions between the surfaces of the block and the plane which tends to prevent the motion of the block when both the component of the gravitational force down the plane and the frictional force are equal.
Which change to an object would reduce its potential energy by half?
A. Increasing its height to twice its original value
OB. Reducing its mass to one-quarter of its original value
O C. Increasing its mass to twice its original value
O D. Reducing its height to one-half of its original value
Answer:
It is D
Explanation:
Make sure you read the question carefully because people get different variations
Jose lifts a 24N box with a force of 57N. What is the resulting net force?
Answer:
Jose lifts a 24N box with a force of 57N. What is the resulting net force?
Explanation:
Jose lifts a 24N box with a force of 57N. What is the resulting net force?
WASSCE
11. An incident ray is reflected normally by a
plane mirror onto a screen where it forms
a bright spot. The mirror and the screen
are parallel and 1 m apart. If the mirror is
rotated through 5°, calculate the
displacement of the spot.
A. 8.7 cm.
B. 10.0 cm.
C. 15.4 cm.
D. 17.6 cm.
WASSCE
Answer:
i think the answer is letter c
True or False?
There are equal numbers of protons and electrons in neutral atoms.
U-U hello good friends U-U
i need model examples for: gravity, magnetism, and static electricity.
plz.
one for each.
The average speed of a cart during a 15 s interval is 3.0 m/s . What is the total distance travels by the cart
Answer:
45m
Explanation:
speed= distance/ time
3.0= distance/ 15
*15 on both sides
45m= distance
After reading the excerpt, readers can visualize
Charlotte as
ay
yed
e
At
O a quiet and shy girl.
an outgoing and energetic girl.
a studious and deep-thinking girl.
a sarcastic and cruel girl.
an
aisle.
Answer:
Its b
Explanation:
Hope this helps
Answer:
b
Explanation:
What the heck is inertia
Which statement best describes evidence that a chemical reaction occurs as a cake bakes? A The water in the cake batter evaporates. B The cake rises as gas bubbles form in the baking cake. C The cake takes the shape of the container in which it is baked. D The water in the cake batter is used to keep the cake moist as it bakes.
Answer:
B
Explanation:
Bubbles are a product of a chemical reaction.
The statement which best describes a chemical reaction is the cake rising
as gas bubbles form in the baking cake.
Chemical reaction involves the formation of new chemicals through
reaction between one or more chemicals.The formation of bubbles indicate
the formation of a new gas and is a characteristic of a chemical reaction.
The formation of a bubble in the cake bake means that a new chemical has
been formed which indicates presence of chemical reaction.
Read more on https://brainly.com/question/16923656
A foam square has a mass of 62 g and a volume of 72 cm'. What is the density?
What is Vatiable Velocity?
Answer:
Explanation: When a body covers unequal distances in equal intervals of time in a specified direction, the body is said to be moving with a variable velocity. Example: A rotating fan at a constant speed has variable velocity, because of continuous change in direction.
An object moves at a constant speed of 5 m/s. This mean the object
Answer:
Vf=Vi
Explanation:
when speed is constant final velocoty is equal to initial velocity
A5 pound object is moving horizontally with a speed of 15m/s. How much force is needed to keep the object
moving at 15m/s in the same direction? Explain WHY. You can give your answer as a relative estimate (ex: a small
amount...)
Brianna is rowing a small boat across a pond. The air is calm; there is no wind
blowing.
a. What type of friction is resisting her motion?
b. If two friends join her in the boat, will the friction force change? Why or why not?
PLEASE I NEEEED HEEEEEEEEEEEELP.
An air bubble of volume 20 cm³ is at the bottom of a lake 40 m deep, where the temperature is 4.0°c. the bubble rises to the surface, which is at a temperature of 20°c. take the temperature of the bubble’s air to be the same as that of the surrounding water. just as the bubble reaches the surface
A. Fluid Friction B. Yes, there is more mass on the boat.
Explanation:
Not very sure about B but goodluck.
If a rock sample has a mass of 1.17 g and a volume of 0.33 cm3,
Answer:
then it's a rock
Explanation:
Anybody good in physics topic WAVE?
Answer:
[tex]oh \: yeah[/tex]
7. The night of desest is very cold and the day is very
hot
Give reason
Answer:
1) Sand cannot hold the heat. It acts like a mirror to the sun. During the daytime, it stays warm, and when the Sun is absent it loses all its heat making the nights colder. There's nothing in the desert that can either absorb heat from the sun or hold it on the surface when the sun is set.
2) Deserts are hot primarily because of a lack of water. When the sun shines on the ground, all of the absorbed sunlight goes into raising the ground's temperature. DESERTS ARE COLD AT NIGHT:Because of the lack of water in the ground, and little water vapor in the air, most deserts can get quite cool at night.
3) The temperature in the desert can change drastically from day to night because the air is so dry that heat escapes rapidly at night. The daytime temperature averages 38°C while in some deserts it can get down to -4°C at night. The temperature also varies greatly depending on the location of the desert.
Rotational speed refers to the number of complete _____ in a given amount of time.
Answer:
rotation
brooo like ittttttttttttt
Why does time seem to flow only in one direction?
Answer:
Time seem to flow in only one direction because it's from entropy. In tiny physics, time is directionally neutral.
Explanation:
Answer:
objects that store memories heat up as the operate(computers and brains). heat(energy) generation increases entropy. entropy is a measure of disorder. entropy is an irreversible process, so the laws of thermodynamics(law 1. energy can't be created or destroyed law 2. the total entropy must increase) require that such objects can only run in one direction: from past to present
Your friend wants to lose weight around the belly. Your friend is planning to do crunches every day to lose the weight, but is not planning on doing any other exercises. Do you think this strategy will be effective? Why or why not? What can your friend do to increase the pace of weight loss? Explain your answer. Please hurry I need a paragraph!!!
But I will put it in my own words so it won't be plagerism!
Answer:
i don't think it will work
Explanation:
because in order to lose weight, you have to do more than one stretch because weight loss takes multiple steps and not just one exercise, it would also involve you to eat healthy and to increase the pace, your friend could go running, do yoga, eat healthier, drink more water, and do more than just a core workout and etcetera.
10 Why is it important for basketball players to wear shoes with tread when playing? to increase the speed of the player to decrease the force between the player and the floor to increase friction between the floor and the player's feet to decrease the amount of force needed for the player to move
Answer:
to increase friction between the floor and the player's feet
Explanation:
It is important for basketball players to wear shoes with tread when playing in order to increase friction between the floor and the player's feet.
Friction between the floor and the player's feet will ensure that players do not trip easily during the course of playing. It also helps in such a way that players can stop quickly and run in the opposite direction without losing traction. Without this friction, it would be virtually impossible to play the game.
What type of combination is a mixture?
Answer:
A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
Explanation:
Answer:
A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
Explanation:
I just did the quiz on study jams and I got them all correct
A person slides a box down a ramp. The box starts from rest 2m above the lowest point. The ramp is frictionless. Once the box reaches the bottom there is friction. For every 1m the box travels on the flat part increases by 100 J. Where does the box stop? The box has mass of 5 kg.
Answer:
.98m
Explanation:
Vf=Vi+2at
(V F)^2+2 ( change in distance )
X f= i ( change in V & T )
EK=1/2Mv^2,EG=mgh
This question involves the concepts of the law of conservation of energy, work done, Newton's Second law of motion, and equation of motion.
The box stops at a distance of "1.02 m".
First, we will use the law of conservation of energy to find out the final velocity when the box reaches the flat part.
[tex]Loss\ of\ Potential\ Energy=Gain\ in\ Potential\ Energy\\mgh=\frac{1}{2}mv^2\\\\2gh=v\\v=\sqrt{2gh}[/tex]
where,
v = speed = ?
g = 9.81 m/s²
h = height = 2 m
Therefore,
[tex]v=\sqrt{(2)(9.81\ m/s^2)(2\ m)}[/tex]
v = 6.26 m/s
Now, we will use the formula of work done to find out the force applied to the box to stop the motion:
[tex]W = Fd[/tex]
where,
W = Work Done = 100 J
F = Force applied = ?
d = displacement = 1 m
Therefore,
[tex]100\ J = F(1\ m)\\F = 100\ N\\[/tex]
Now, we will use Newton's Second Law of Motion to find out the deceleration of the person:
[tex]F=ma[/tex]
where,
m = mass = 5 kg
a = decceleration =?
Therefore,
[tex]100\ N = (5\ kg)a\\\\a=\frac{100\ N}{5\ kg}\\\\a = - 20\ m/s^2[/tex]
negative sign shows deceleration.
Now, we will use the third equation of motion to find the distance at which the box stops.
[tex]2as=v_f^2-v_i^2\\2(-20\ m/s^2)s=(0\ m/s)^2-(6.26\ m/s)^2\\\\s=\frac{40\ m/s^2}{39.24\ m^2/s^2}[/tex]
s = 1.02 m
Learn more about equations of motion here:
brainly.com/question/20594939?referrer=searchResults
The attached picture shows the equations of motion in the horizontal and vertical directions.
Can y’all help me on number 2
Answer:
sure
Explanation:
Answer:
250 times 10= 2,500, squared, the answer is 25,000
Explanation:
force= mass times acceleration, squared means multiply that number again, since 10 is squared you multiply by ten again
In a tug of war , two teams pull on the rope with a certain force. If team A pulls on it with a force of 225 N and team B pulls on it with a force of 360 N, what is the magnitude of the resultant force on the rope?
Answer:
135 N
Explanation:
Given that:
In a tug of war, team A pulls the rope with a force of 225 N; &
Team B also pulls with a force of 360 N
The magnitude of the resultant force is the difference between the two forces since they are positioned in the opposite direction.
Thus;
The magnitude = 360 N - 225 N
So, magnitude of resultant force on the rope = 135 N