Answers
Answer:
b d c a
Explanation:
Related Questions
What is the momentum of a 750-kg Volkswagen Beetle when at rest? (value only, no units)
Value:
Answers
Answer:
P = 0
Explanation:
Momentum is defined as the quentity of motion contained in a body. Mathematically, it can be defined as the product of mass and velocity. So, in order to determine the Volkswagen Beetle, at rest, we can use the simple formula, as follows:
[tex]P = mv[/tex]
where,
P = Momentum of Volkswagen Beetle = ?
m = Mass of Volkswagen Beetle = 750 kg
v = Velocity of Volkswagen Beetle = 0 m/s (since, it is at rest)
Therefore,
[tex]P=(750)(0)[/tex]
P = 0
Where does the force come from that propels a rocket forward?
Answers
it is called the trust Answer:
Explanation:
A 10 kg bowling ball that is 20 meters above ground has more gravitational potential energy than a 1000 kg wrecking ball that's on the ground (height is Om), True or False?
Answers
Answer:
True
Explanation:
The Gravitational potential energy is given by:
G = mgh
m = mass of body ; g = acceleration due to gravity ; h = height
G for a ball of mass 10kg ; height of 20 meters above the ground
G = 10kg * 9.8m/s² * 20m = 1960 kgm²/s²
G for a ball of mass 1000kg at height, 0 meters :
G = 1000 * 9.8 * 0 = 0
1960 > 0
Hence, Gravitational potential energy for 10kg ball at height 20m is greater Thammfor a 1000kg ball on the ground.
Earth's gravity is pulling a ball downward toward Earth. What is the reaction force?
Answers
Answer: Air resistance is "pushing" the ball upwards.
Explanation:
What is the difference between a mechanical wave and an electromagnetic wave?
A mechanical wave travels through empty space, while an electromagnetic wave travels through matter.
A mechanical wave has a short wavelength, while all electromagnetic waves have long wavelengths.
A mechanical wave has a high frequency, while all electromagnetic waves have low frequencies.
A mechanical wave travels through matter, while an electromagnetic wave travels through empty space.
its regular chooiseing just decide one and tell me
Answers
Answer: A a mechanical wave travels through empty space, while an electromagnetic wave travels through matter.
Explanation: A mechanical wave travels through empty space, while an electromagnetic wave travels through matter. A mechanical wave has a short wavelength, while all electromagnetic waves have long wavelengths.
Please I need help with this question (see image).
Show workings if necessary
Answers
When an athlete perspires after running
Evaporation occurs and helps to cool the body.Convection cools the body.The body absorbs cold from the surrounding air.Heat is conducted away from the body.Answer :When an athlete perspires after running evaporation occurs and helps to cool the body.
Correct option is A.
Explanation :When an athlete perspires after running then sweat evaporates and we know that evaporation causes cooling as evaporation requires heat energy. The required heat energy is taken away by the molecules of sweat when they convert from liquid into gas, and this causes cooling on the surface of body. That's why it helps to cool the body.
Which statement about force is incorrect
A. Some forces cause objects around us to move.
B. Some forces keep objects around us from moving
C. Force is the ability to change motion and transfer matter.
D. Force causes changes in the motion and energy of matter.
Answers
Answer:
I don't know sorry brother/sister
Explanation:
please mark as brilliant
An object completes 2500 cycles in 25 s.
a. What is the period of its rotation?
b. What is the frequency of its rotation?
Answers
Answer:
a) 0.01s
b) 100Hz
Explanation:
Period is defined as the time taken by a wave to complete 1 oscillation.
Since the object completes 2500 cycles in 25secs, we can write
2500cycles = 25secs
1 cycle = x
Cross multiply
2500x = 25
x = 25/2500
x = 0.01secs
Hence the period of its rotation is 0.01secs
b) is the reciprocal of the period
Frequency = 1/Period
Frequency = 1/0.01
Frequency = 100Hertz
Hence the frequency of rotation is 100Hz
what do you know about the universe
Answers
Answer:
all existing matter and space
Explanation:
Answer:
The universe diameter is unknown
Explanation:
Explain how balanced and unbalanced forces affect objects that are not
moving and those that are moving.
Answers
A potter's wheel moves from rest to an angu-
lar speed of 0.10 rev/s in 24.6 s.
Assuming constant angular acceleration.
what is its angular acceleration in rad/s?
Answer in units of rad/s
Answers
Answer:
angular acceleration =final angular speed + initial angular speed
time
=0.6283rad/s +0
24.6s
=0.6283/24.5
=0.025rad/s^2
Explanation:
first angular speed is equal to angular velocity and we will convert the unit to rad/s so 1rev/sec=6.283rad/s then angular acceleration is the rate at which the angular velocity changes with the time we have the final angular velocity,initial angular velocity and time now substitute the numbers in the formula and the value will be 0.025 rad per seconde square
A radium atom has 88 protons and 226 neutrons. How many electrons does it have?
Answers
Answer:
No. of electrons = 88
Explanation:
Given that,
No. of protons = 88
No. of neutrons = 226
We need to find the number of electrons it have in a radium atom.
In an atom, the number of protons is equal to the number of electrons. There are 88 protons in this case.
Hence, there are 88 electrons in the radium atom.
Thorium (Th) has an average atomic mass of 232.04 u and an atomic number of 90. In the space below, draw a square from the periodic table to represent thorium.
Answers
Answer:
Explanation:
90
Th
232.04
Box that and there is your answer.
Answer:
Explanation:
90
Th
232.04
Which of the following is not the result of nuclear decay.
An unstable atomic nucleus emits energy
An unstable atomic nucleus discharged particles
An unstable atom changes its identity
A stable atom change its identity
Answers
Answer:it’s c
Explanation:
Answer:
an unstable atomic nucleus emits energy
Explanation:
just toke quiz
2- A car spends two hours driving at 20 km/h, and then an hour driving at 50 km/h.
What is the average speed of the car?
A. 50 km/h
B. 45 km/h
C. 35 km/h
D. 30 km/h
Answers
When a car spends two hours driving at 20 km/h, and then an hour driving at 50 km/h. then the average speed of the car would be 30 km/h , therefore the correct answer is option D.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is meter/second. The generally considered unit for speed is a meter per second.
The mathematical expression for speed is given by
average speed = total distance /Total time
As given in the problem A car spends two hours driving at 20 km/h, and then an hour driving at 50 km/h
The total distance covered by the car is
S =2×20 +1×50
=90 km
The total time taken by the car is
T = 3 hour
then by using the formula for the average speed
average speed = total distance /Total time
By substituting the respective values of the total speed and total time
average speed = 90/3 km/h
=30 km/h
Thus, The correct answer is option D because a car's average speed would be 30 km/h if it spent two hours traveling at 20 km/h and one hour traveling at 50 km/h.
Learn more about speed from here
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Guys please help meeee :(((
Answers
Answer:
The satellite is pulling up on Earth with a force of 2000N
Explanation:
According to Newton's third law of motion, the satellite is pulling up on Earth with a force of 2000N
Newton's third law of motion states that "Action and reaction are equal and opposite".
As the earth pulls the satellite in space with an action force of gravity, based on Newton's third law of motion, a reaction force acting in an opposite direction is also in place.
This reaction force is that of the satellite.
Aaron walks 5 miles every day for exercise, leaving his front porch at 5:00 am. And returning to his porch at 6:00 am. What is the total displacement of his daily walk? *
need to know the answer now
Answers
Answer:
Total displacement = 0
Explanation:
He lives his front porch and still returns to his front porch.
Now, displacement is a vector quantity and as such, it is the distance between the initial point of movement and the final point of movement.
In this case the initial point is the same as the final point and thus the displacement is zero.
why naked wire cannot use in electromagnet
Answers
Answer:
Explanation:
The wire in the windings needs to be insulated. Electricity takes the shortest path from one place to another. If the wire is bare, then adjacent turns are touching. The result is the current flows through the shortest path between the leads of the electromagnet, never flowing through a single turn of the coil.
If you found my answer useful then please mark me brainliest.
Answer: It will short between the windings; the current rather than passing around and around and around the core will just pass across the surface and create no magnetic field (which is proportional to the number of turns it takes around the core).
Explanation: If naked wire is used then the iron rod also acts as a conductor and short circuit takes place instead of showing magnetic effect of electricity to the molecules of the rod. Hence, naked wire is not used while making electromagnet.
Which of the following is NOT made up of atoms?
A. Heat
B. A gas
C. A cell
D. A solid
Answers
Answer:
A. heat
Explanation:
heat isn't a physical thing like all the rest of the options
4. Priyanshi Is Writing Some Statements But She is Confused To Know Whether The Statements
Are Correct Or Not? Which answer do you think is correct?
[A] We cannot see anything through an opaque object.
[B] Those materials which do not allow any light to pass through them are called opaque
materials.
[C] If we cannot see through an object at all, it is not allowing any light to pass through it and
Answers
Answer:
i think the answre is C but the option is not complete !
Answer:
we cannot see anything through an opaque object
forces can be________. What phrase completes the sentence.
1.Pushes only
2.Pushes or pulls
3.Pulls only
Answers
Answer:
pushes or pulls
Explanation:
hope this helps....
the block of wood is placed on a rough horizontal plane.if the friction between the block and the plane is 6n ,what is the work done to move the block througha distance of 1.5m?
Answers
Answer:
Gravitation for exert on block along slope = Mgsin30
Since net force is 0 (constant speed)
Frictional force = Mgsin30
C(friction) = Frictional Force/Normal Force
Normal Force = Mgcos30
C(friction) = Frictional Force/Normal Force
=Mgsin30/Mgcos30
= tan 30
=0.577
Explanation:
why floating is important in swimming?
Answers
Answer:
floating is important in swimming because if you are ever in a bad position possibly in the ocean and get tired of swimming you can float.
Explanation:
what is the power of television that transfers 6750J of energy every 45 seconds.
Answers
Very Important!!
If a person rapidly drinks a large amount of alcohol, it could lead to what is known as.
A. an alcohol-induced blackout.
B. an alcohol-inspired coma.
C. an alcohol-induced fainting spell.
Answers
Answer:
B) an alcohol-inspired coma
There are three types of alcohol one is primary second is secondary and third is tertiary. Therefore, the correct option is option B that is an alcohol-inspired coma.
What is alcohol?Alcohol is a chemical molecule with a functional group called hydroxyl linked to a saturated carbon atom. Alcohols classified as primary have just one alkyl group on which the carbon atom of the hydroxyl group (OH) is connected.
Secondary alcohols are those that have two alkyl groups on either side of the carbon atom of the hydroxyl group. In tertiary alcoholic group, the carbon that is bonded to hydroxyl group is bonded to three alkyl groups. If a person rapidly drinks a large amount of alcohol, it could lead to what is known as an alcohol-inspired coma.
Therefore, the correct option is option B.
To know more about alcohol, here:
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Which of the following best describes acceleration?
the rate of change of position
the rate of change of velocity
the rate of change momentum
the rate of change of force
Answers
Answer:
the rate of change of velocity
Which formula is used to find an object's acceleration?
Answers
Answer:
Explanation:Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2). Acceleration is also a vector quantity, so it includes both magnitude and direction
Answer:
c on edge
Explanation:
Complete the statement below with all that apply.
Acceleration is
Answers
The answer is B- the slope of a velocity vs. time graph.
Coulomb's Law tells us that the relationship of the distance between the charges and the force them is ...
A. inversely proportional
B. direct square
C. inverse square
D. directly proportional
Answers
Answer:
inversely proportional
Explanation:
I know this because I'm learning this right now. My teacher told me that Coulomb's Law is important because it shows us the positive and negative attraction between the two charges. It also tells us that if we have two like charges, then they're going to repel, but the closer they get, the bigger charge it's going to have. Coulomb's Law tells us the force between charged particles is inversely proportional to their charges.
if a 75 N force is applied to a box moving it 4 m in 6 seconds how much power does the force exert
