What is the speed of an object that travels 80 meters in 2 seconds?
a
160 m/2
b
0.04 m/s
c
40 m/s
Answer:
an object traveling 80 meters in 2 sec. is 160
If the only force acting on an object is friction during a given physical process, which of the following
assumptions must be made in regard to the object's kinetic energy?
Answer:
The kinetic energy decreases.
Explanation:
Friction is defined as a opposite force to motion. If friction is the only force acting on an objects, its kinetic energy decreases.
It is so because due to resistive force or friction, kinetic energy is converted to heat energy and that reduces the total kinetic energy in the system.
Hence, the correct answer is "The kinetic energy decreases."
The assumptions must be made base in the object’s kinetic energy in a situation whereby frictional force is the only force acting on an object is A:The kinetic energy decreases.
Frictional force can be regarded as opposing force that is formed between two surfaces which have their movement in the same direction or opposite directions. Friction always brings about reduction in motion of a body which in turn bring a decrease to it's kinetic energy, because it us an energy of motion.Therefore, option A is correct.
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Tor F. When we carry an object across the room without lifting it or setting it down, we
don't do any physical work on it.
Answer:
True
Explanation:
Study guide answer key
What is the acceleration of an object that has a mass of 10kg and is pushed with a force of 50n
Answer:
5m/s/s
Explanation:
force = mass x acceleration
50 = 10a
a=5m/s/s
if a ball is thrown up from the ground and takes 2.30 seconds before it hits the ground. A) what was its initial velocity b) what was its max velocity
Answer:
A) The initial velocity is 11.27 m/s
B) The maximum velocity is 11.27 m/s
Explanation:
A) The question is with regards to kinematic motion under gravity
The the time it takes the ball to travel up and return back to the ground = 2.30 seconds
Therefore, from the kinematic equation of motion of the ball, under gravity, v = u - g·t, we have;
t = (v - u)/g
Where;
t = The total time of the motion of the ball = 2.30 seconds
v = The final velocity of the ball = 0 m/as at the maximum height
u = The initial velocity of the ball
g = The acceleration due to gravity = 9.8 m/s²
Therefore, given that we have;
The time it takes the ball to ascend = The time it takes the ball to descend
The time it takes the ball to ascend to maximum height = 2.30 second/2 = 1.15 seconds
Substituting the parameter values of the motion to maximum height, we get;
1.15 = (0 - u)/(-9.8)
-9.8 × 1.15 = -u
11.27 = u
The initial velocity, u = 11.27 m/s
B) Given that the ball experiences a deceleration on the way up, and that the motion of a parabola is symmetrical about the vertex, which is the maximum height, where the velocity is zero, we have that the initial velocity is equal to the final velocity which are both equal to the maximum velocity
Therefore, the initial velocity = The maximum velocity = 11.27 m/s.
How do I find the change in velocity of a hockey puck?
Mass=0.1697 kg btw
Answer:The foot exerts a force on the ball during a well-defined
duration t (time extent of the contact)
Explanation:
You look at yourself in the mirror and notice many of your physical features: your hair color, eye color, your height, dimples, etc. How does DNA relate to the way you look the way you do?
well, you get some DNA from both of your parents, so when you hear the phrase, "You have your mother's eyes!" That means you have some of your mother's DNA that gave you her eye color. The DNA you get from your parents help determine how you look today
A ball is pushed into a spring-loaded launcher with a force of 20 N, which compresses the spring 0.08 m.
A) What is the spring constant of the spring
B) Find the elastic potential energy (PEs) stored in the spring (or the work done on the spring)
Answer:
0.8J
Explanation:
Given parameters:
Force = 20N
Compression = 0.08m
Unknown:
Spring constant = ?
Elastic potential energy = ?
Solution:
To solve this problem, we use the expression below:
F = k e
F is the force
k is the spring constant
e is the compression
20 = k x 0.08
k = 250N/m
Elastic potential energy;
EPE = [tex]\frac{1}{2}[/tex] k e² = [tex]\frac{1}{2}[/tex] x 250 x 0.08²
Elastic potential energy = 0.8J
The diagram below shows an electric circuit with a battery and a bulb.
What energy transformations would occur when the bulb lights?
B. chemical to electrical to light
C. electrical to mechanical to light
D. chemical to electrical to solar
A. light to electrical to chemical
(First answer gets brainliest)
Answer:
B. chemical to electrical to light
The battery holds chemical energy, which is transformed to electrical energy due to flow of electrons.
The electrons due to their drift velocity which heats up the bulb filament hence producing light.
Answer:
B
Explanation:
because i learned in 5th grade
Do you believe that global warming is happening? Tell why or why not. If you believe global warming is happening, what can we do to slow it down?
Answer:
Yes I do believe global warming is happening, mainly because there is a plethora of data and research from scientists to support the claim. The effects of global warming around us are clearly observed as well, such as the rise in acidity in the oceans. Another example is in the Artic, where a natural occurence takes place. Ice freezes and cold salty water takes its place, and because of it's high density it sinks and sweeps across the ocean floor. That cold water is then replaced by warmer water, and this is called the global ocean conveyor belt. As seen through the example with the Artic, ocean temperature plays a key role in the conveyor belt. Climate change is fueled through human activities, which could harm the system. If one part of the conveyor belt were to break down, such as the one in the Artic, nutrients will not be distributed to start the food chain. Organisms such as phytoplankton need those nutrients to thrive. If phytoplankton are endangered, all life in the oceans is endangered. So as we can see, global warming is extremely harmful to the environment and it's effects are observed around us.
To slow global warming down we should consume less meat, and go to vegan or vegetarian diets. Your carbon footprint is halved by consuming less meat and eating a more vegan or vegetarian diet. Another thing is that we as a society should stop using so much plastic. It takes more than a century to degrade, most landfills are composed of it. Microplastics also get into our oceans, and our fish end up consuming them.
Explanation:
What is the range of wavelengths that our eyes can see on the spectrum(this is called visible light spectrum)
Answer:
380 to 700 nanometers
Explanation:
The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. More simply, this range of wavelengths is called visible light. Typically, the human eye can detect wavelengths from 380 to 700 nanometers.
What caused the original creation of the Universe? How do we find out?
A dog starts at position x=2.50m, and undergoes a displacement of 8.25m. What is its final position?
Answer:
Civil law deals with behavior that constitutes an injury to an individual or other private party, such as a corporation. Examples are defamation (including libel and slander), breach of contract, negligence resulting in injury or death, and property damage.
Explanation:
While having an argument, two people each push on a couch with 200 N of force in opposite directions. What is the net force on the couch? Explain how you found the answer.
Answer:
Explanation:
Net force = 0
This is a very instructive question to do. Here's what the situation looks like
[tex]====>\box{Couch) }<====\\[/tex]
The two forces are going in opposite directions. One is going 200 N to the right and the other is going 200N to the left.
The net result is 0.
Put in formula form, it looks like this.
Going left is the negative direction
F_right - F_left = 200 - 200 = 0
A source charge generates an electric field of 1236 N/C at a distance of 4 m. What is the magnitude of the source charge?
A. 2.2 ɥC
B. 680 ɥC
C. 2.2 C
D. 680 C
can someone explain this in detail because im having a hard time understanding these type questions...thank you!!
Answer:
A. 2.2 ɥC
Explanation:
Given;
electric field strength, E = 1236 N/C
distance of the source charge, r = 4 m
Electric field strength is calculated as;
[tex]E = \frac{kQ}{r^2}[/tex]
where;
Q is the magnitude of the source charge
k is Coulomb's constant = 9 x 10⁹ Nm²/C²
[tex]E = \frac{kQ}{r^2} \\\\kQ = Er^2\\\\Q = \frac{Er^2}{k} \\\\Q = \frac{(1236)(4^2)}{9 \ \times \ 10^9} \\\\Q = 2.197 \ \times \ 10^{-6} \ C\\\\Q = 2.197 \ \mu \ C[/tex]
Therefore, the correct option is A. 2.2 ɥC
Required
Which of these is called a meteor? *
1: a chunk of metallic or stony matter found in space
2: a chunk of metallic or stony matter found on Earth's surface
3: a streak of light caused by something entering Earth's atmosphere
What is the answer?
Answer:
lk
Explanation:
2
A current of 8 A flows through a conductor. The number of electrons passing through the conductor in each second will be
Answer:
8=3×1019 electrons per second.
Explanation:
Answer:
here
Explanation:8=3×1019 electrons per second.
What is the main difference between speed and velocity?
Answer:
Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement.
Answer:
Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement.
Explanation:
Which statement accurately describes radioactive dating?
a. Geologists use only one type of radioactive dating.
b. Geologists compare parent and daughter elements to determine rock type.
c. Geologists will measure how stable multiple parent elements can decay into multiple daughter elements.
d. Geologists compare the observed abundance of naturally occurring radioactive isotopes and their decay products using decay rates.
Answer: C. is the answer
Explanation:
Answer:
D
Explanation:
took the test :D
A 900 kg car runs into a 70 kg deer at 28 m/s. If the car transfers all of its momentum to the deer, how fast does the deer go flying away?
Answer:
Mc = 900 Kg
Uc = 28 ms^-1
Md = 70 Kg
Ud = 0
We want Vd
Vc = Vd
This situation is elastic momentum
[tex]m _{c}u _{c}+ m _{d}u _{d} = m _{c}v _{c} + m _ dv _{d} \\ (900 \times 28) + (70 \times 0) = (900 \times v _{d} ) + (70 \times v _{d}) \\ 25200 = (900 + 70)v _{d} \\ 25200 = 970v _{d} \\ v _{d} = \frac{25200}{970} \\ v _{d} = 26 \: m {s}^{ - 1} [/tex]
Power is calculated by multiplying voltage by
a. current.
b.
energy.
C. resistance.
d. voltage.
Please select the best answer from the choices provided
B
ОООО
D
Answer:
d
Explanation:
When you heat water, it changes from-- *
A a gas to a liquid
B a liquid to a gas.
C a liquid to a solid
Answer:
Hi! It's B - liquid to a gas.
This political cartoon summarizes proposed legislation to stop immigration into the United States through the use of
A. Income
B. Military force
C. Building a barrier wall
D. Educational requirements
explain why smoke particles in air move about faster if the temp of the air is increased??
Answer:
kinetic energy increases with the energy which causes the particles to move faster resulting in increases collision rates and rate of diffusion.
Explanation:
The increase in temperature of the air causes the air molecules to have more kinetic energy, which leads to more frequent and forceful collisions with the smoke particles. This, in turn, causes the smoke particles to move faster through the air.
What is kinetic energy?Kinetic energy is the energy an object possesses due to its motion. Any object that is in motion has kinetic energy, and the amount of kinetic energy it has depends on its mass and velocity.
The formula for calculating kinetic energy is:
KE = 1/2 × m × v²
where KE represents kinetic energy, m represents the mass of the object, and v represents the velocity of the object.
Here in the question,
Smoke particles in the air move around due to collisions with air molecules. When the temperature of the air increases, the average kinetic energy of the air molecules also increases. This means that the air molecules are moving faster and colliding more frequently with the smoke particles.
The smoke particles themselves do not have an increase in kinetic energy, but they do receive more energy from the collisions with the air molecules. This extra energy causes the smoke particles to move faster and more erratically, making them more dispersed throughout the air.
In addition, when air is heated, it becomes less dense. This means that there are fewer air molecules in a given volume of air. As a result, the smoke particles have more space to move around and collide with air molecules, which further contributes to their increased speed and movement.
Therefore, increasing the temperature of the air increases the speed and frequency of collisions between the air molecules and smoke particles, leading to the smoke particles moving faster and more widely dispersed throughout the air.
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A 120 Ω resistor, a 60 Ω resistor, and a 40 Ω resistor are connected in parallel and placed across a potential difference of 12.0 V. What is the equivalent resistance of the parallel circuit?
Answer:
The equivalent resistance of the parallel circuit would be 20 Ω
Explanation:
To calculate the resistance of resistors connected in parallel, the formula to be used is
1/R = 1/R₁ + R₂ + R₃ + R₄...
1/R = 1/120 + 1/60 + 1/40
1/R = (1 + 2 + 3)/120
1/R = 6/120
1/R = 1/20 Ω
This can be rewritten or cross-multiplied to be
R × 1 = 20 × 1
R = 20 Ω
The equivalent resistance (R) would then be 20 Ω
If a net horizontal force of 0.8 N is applied to a toy whose mass is 1.2 kg what acceleration is produced?
Answer:
0.67 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{0.8}{1.2} \\ = 0.666666...[/tex]
We have the final answer as
0.67 m/s²Hope this helps you
Who would like to be my girlfiend ?
nobody this is a app to help others
Answer:
I bet my great grandmother would
A piece of aluminum and a piece of cotton are rubbed together. The piece of cotton is brought very close to the top of the metal electroscope and the electroscope is permanently charged by induction. What charge does the electroscope have?
Answer:
najsijsnakjenbwjwjjnbbwjwjejje
How would you measure the volume of an oddly shaped object
By breaking the object into tiny pieces and placing them in a beaker
By placing it on a triple beam balance
By placing it in a room without gravity
By placing it in water and measuring how high the water rises
Answer:
By placing it in water and measuring how high the water rises
Explanation:
You can place the object in a can filled with water. You'll then see that as it sits there, the water level rises. You would then measure that to find the volume.
the ratio of the rise to the run of a line on a graph (steeper line = faster speed)