Answer:
Mass, M = 0.75kg
Explanation:
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex] K.E = \frac{1}{2}MV^{2}[/tex]
Where, K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents velocity measured in metres per seconds square.
Given the following data;
Kinetic energy = 150J
Velocity = 20m/s
Making mass the subject formula;
[tex] M = \frac{2K.E}{V^{2}}[/tex]
Substituting into the equation, we have;
[tex] M = \frac{2*150}{20^{2}}[/tex]
[tex] M = \frac{300}{400}[/tex]
Mass, M = 0.75kg
a cheetah goes from standing still to running at 60 mph in 3 seconds. what is the cheetahs acceleration in standard international units?
The acceleration of the cheetahs in the standard international units would be 8.938 meters/second².
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object.
As given in the problem a cheetah goes from standing still to running at 60 miles per hour in 3 seconds
1 mile = 1609 meters
60 miles = 60×1609 meters
=96540 meters
1 hour = 3600 seconds
the initial velocity of the cheetah = 0
the final velocity of the = 96540/3600
=26.8166 meters/seconds
acceleration = (final velocity - initial velocity) /time period
=(26.8166 -0)/3
=8.938 meters/second²
Thus, the cheetah's acceleration would be 8.938 meters/second².
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Bart carried his skateboard up a hill and then rode the skateboard down the hill. When he reached the bottom of the hill, he rolled to a stop. When did Bart have the most potential energy?
Explanation:
The potential energy of an object is given by :
P = mgh
Where,
m is mass, g acceleration due to gravity and h is the height reached by the object.
The potential energy of an object is directly proportional to the height of the object. It means that when the skateboard reaches at the maximum height, it has highest potential energy.
A brick is cut into small pieces. Which physical property do the small pieces have in common with the brick from which they came?
Answer:
Density
Explanation:
Density is defined as the ratio of mass of an object to the volume of object.
The density remains an equivalent because cutting the brick into small pieces will divide the mass & volume by an equivalent amount. This means the density of a object remains an equivalent (or same) regardless of what size shape, length, it is.
Planet X has a mass of M and a radius of R. Planet Y has a mass of 3M and a radius of 3R. Identical satellites orbit both planets at a distance R above their surfaces, as shown above. The planets are separated by such a large distance that the gravitational forces between them are negligible.
How does the magnitude of the gravitational force FY exerted by Planet Y on its satellite compare to the gravitational force FX exerted by Planet X on its satellite?
Answer:
[tex]{FY} = \dfrac{3}{4} \times FX[/tex]
Explanation:
The parameters given for the planets are;
The mass of planet X = M and the radius of planet X = R
The mass of planet Y = 3·M and the radius of planet Y = 3·R
The magnitude of the gravitational force of the planets on their satellites are given by the following equation;
[tex]F=G \times \dfrac{M_{1} \cdot m_{2}}{R^{2}}[/tex]
Where;
M₁ = The mass of the first object = The mass of the planet
m₂ = The mass of the second object = The mass of the satellite
R = The distance between the centers of the two planets = The distance between the center of the planet and the satellite
G = The universal gravitational constant
The force between planet X and the satellite in its orbit = [tex]FX=G \times \dfrac{M \times m}{(2 \cdot R)^{2}} = G \times \dfrac{M \times m}{4 \cdot R^{2}}[/tex]
The force between planet Y and the satellite in its orbit = [tex]FY=G \times \dfrac{3\cdot M \times m}{(4 \cdot R)^{2}} = G \times \dfrac{3\cdot M \times m}{16 \cdot R^{2}} = G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}[/tex]
Therefore;
[tex]\dfrac{FY}{FX} = \dfrac{G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}}{G \times \dfrac{M \times m}{4 \cdot R^{2}}} = \dfrac{3}{16} \times \dfrac{4}{1} = \dfrac{3}{4}[/tex]
[tex]{FY} = \dfrac{3}{4} \times FX[/tex]
What is the main difference between physical and chemical changes? ____ a. Chemical changes require a change in composition and physical does not b. Chemical changes do not require a change in composition but physical they do. c. Chemical changes are reversible d. None of the above
Answer:
a. Chemical changes require a change in composition and physical does not
Explanation:
The main difference between physical and chemical changes is that chemical changes require a change in composition and physical does not.
A chemical change is the change in composition of a substance which is irreversible and a permanent change.
On the other hand, physical change is a temporary change in a substance and can be easily reversible. The composition of a substance do not change in physical composition.
1. ____________________________ is the source of energy that drives Earth's water cycle. 2. As heat energy was added to the water, it changed state from a _______________________ to a ______________________. This __________________ is also called ___________________________. 3. As more energy is added to the water, the water molecules move _________________________ and farther apart.
Answer:
When water absorbs enough heat, it becomes a gas (water vapor). This process is called evaporation.
Explanation:
If the force of gravity on an object increases, what happens to its weight?
Answer:
It also increases
Explanation:
The strength of the gravitational force between two objects depends on two factors, mass, and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases.
A 100-g bullet is fired from a rifle having a barrel 0.600 m long. Choose the origin to be at the location where the bullet begins to move. Then the force (in newtons) exerted by the expanding gas on the bullet is 15 000 1 10 000x 2 25 000x 2 , where x is in meters. (a) Determine the work done by the gas on the bullet as the bullet travels the length of the barrel. (b) What If? If the barrel is 1.00 m long, how much work is done, and (c) how does this value compare with the work calculated in part (a)?
Answer:
a) W=9000J
b) W=11,666.67 J
c) The work done by the gas with a 1 meter barrel is 2,666.67 J greater than the work done by the gas with a 0.600 m barrel. This is about 1.3 times greater.
Explanation:
(The function written in the problem isn't too clearly written, but I believe it should be like this:
A 100-g bullet is fired from a rifle having a barrel 0.600 m long. Choose the origin to be at the location where the bullet begins to move. Then the force (in newtons) exerted by the expanding gas on the bullet is [tex]15 000 + 10 000x - 25 000x^{2}[/tex] , where x is in meters. (a) Determine the work done by the gas on the bullet as the bullet travels the length of the barrel. (b) What If? If the barrel is 1.00 m long, how much work is done, and (c) how does this value compare with the work calculated in part (a)?)
a)
Since the force applied to the bullet is going to vary with the length of the barrel, we will need to make us of integration to find the work done by the gas.
So first, we start by drawing a sketch of what the problem looks like. (See attached picture). This will help us visualize the problem better.
Now, work is defined as the following integral:
[tex]W=\int\limits^a_b {F} \, dx[/tex]
The problem tells us the force exerted by the expanding gas on the bullet is:
[tex]F(x)=15,000+10,000x-25,000x^{2}[/tex]
So we go ahead and substitute this function into the integral.
[tex]W=\int\limits^{0.6}_0 {15,000+10,000x-25,000x^{2}} \, dx[/tex]
Now, before integrating that function, we can factor it so it is easier for us to integrate and to deal with the values, so we can factor a common 5,000 out, so we get:
[tex]W=5,000\int\limits^{0.6}_0 {3+2x-5x^{2}} \, dx[/tex]
and we proceed to integrate so we get:
[tex]W=5,000[3x+x^2-\frac{5}{3}x^{3}]\limits^{0.6}_0[/tex]
and evaluate the integral, so we get:
[tex]W=5,000([3(0.6)+(0.6)^2-\frac{5}{3}(0.6)^{3}]-[3(0)+(0)^2-\frac{5}{3}(0)^{3}][/tex]
Which yields:
W=9000J
b)
For part b we follow the exact same procedure but we change the limits of integration for 0 and 1 so the integral looks like this:
[tex]W=\int\limits^1_0 {15,000+10,000x-25,000x^{2}} \, dx[/tex]
and we get the following answer:
[tex]W=5,000[3x+x^2-\frac{5}{3}x^{3}]\limits^1_0[/tex]
and
[tex]W=5,000([3(1)+(1)^2-\frac{5}{3}(1)^{3}]-[3(0)+(0)^2-\frac{5}{3}(0)^{3}][/tex]
so
W=11,666.67 J
c) The difference between the two works we calculated is:
11,666.67J-9000J=2,666.67J
so the work done by the gas with a 1 meter barrel is 2,666.67 J greater than the work done by the gas with a 0.600 m barrel.
if we did the following division:
[tex]\frac{11,666.67}{9,000}=1.3[/tex]
So we can see that this is about 1.3 times greater.
You are waiting in line for your favorite ride and carrying a backpack with you that
weighs 20 N. You've been standing in the SAME spot in line for 5 minutes how much
power do you use? Explain your answer.
What is elastic energy determined by.
The ability to get energy out depends on the material's elasticity. The energy stored in a spring depends on the: Distance the spring is deformed (stretched or compressed) The spring constant, which defines the amount of force required to deform a spring by a certain length (the work done on the spring).
What waves have a lot of energy and are potentially harmful
the picture below shows a centrifuge used to test astronauts
Which vectors shows the direction of the centripetal acceleration at this point?
A. A
B. B
C. C
D. D
[PLEASE SOMEONE HELP! ASAP]
Answer: B
Explanation: just did the quiz
Vector B shows the direction of the centripetal acceleration at this point.
What is centripetal acceleration?Centripetal acceleration is the acceleration of a frame traversing a circular path. because the pace is a vector quantity (this is, it has both a magnitude, the rate, and a course), when a frame travels on a circular course, its route continuously adjustments, and accordingly its velocity changes.
What reasons for centripetal acceleration?Centripetal forces motivate centripetal accelerations. within the special case of the Earth's circular motion around the sun – or any satellite's ground movement around any celestial body – the centripetal force causing the movement is the end result of the gravitational enchantment among them.
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If the word "kinetic" refers to motion/movement, why is Kinetic Sand called Kinetic sand?
Answer:
Kinetic sand is regular sand that's been coated with silicone oil
Explanation:
hope it helps
A sample of matter experiences a decrease in average kinetic energy as it continues to cool. One would anticipate that the particles will eventually come to a complete stop. The temperature at which particles should theoretically stop moving is absolute zero. Thus, option B is correct.
What theory directly contradicts concept of absolute zero?
All molecules are predicted to have zero kinetic energy and, as a result, no molecular motion at absolute zero (273.15°C). Zero is a hypothetical value (it has never been reached).
Absolute zero signifies that there is no kinetic energy involved in random motion. A substance's atoms don't move relative to one another.
Therefore, Kinetic energy because it can create heat which goes against the absolute zero. A gas molecule's kinetic energy tends to zero when the temperature reaches absolute zero.
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Which characteristic is present in a planet but not in a dwarf planet? A spherical shape. An orbit around the sun. An orbit cleared of other objects. A potato-like shape.
Answer: An orbit cleared of other objects.
There are three basic characteristics that a planet must have. Dwarf planets have two of these characteristics: an orbit and a spherical shape. However, dwarf planet orbits are not cleared of other objects like the orbits of planets.
A man bungee jumps off a bridge and is brought to a rest by the stretched
bungee cord. This is an example of which of the following?
A. long time, small force
B. long time, large force
C. short time, small force
D. short time, large force
Who knows the answer
Answer:
I'm pretty sure it's A. long time, small force.
Which game most represents a wave?
Answer:
D: tipping over dominoes
Explanation:
tipping over dominoes makes a wave-like movement
Answer:
the answer is D. just got it right 4/19/22
Explanation:
A motorcyclist started a race from START line and from rest, and accelerated with the acceleration of 3 m/s2 for 8 seconds. Then he was moving with a constant velocity for 2 seconds. What was the racer’s position from the START line after 8+2 seconds from the start of the race? The CHoices: 48,72,102,144,288
I REALLY NEED HELP ON THIS
What is the velocity of an object that has been falling freely in a vacuum
for 4 seconds?
The velocity of an object that has been falling freely in a vacuum
for 4 seconds is 39.2 m/s.
The given parameters;
time of motion, t = 4 secondsThe value acceleration due to gravity in vacuum is approximately 9.8 m/s².
The final velocity of the object is calculated as follows;
v = u + gt
where;
u is the initial velocity of the object = 0g is acceleration due to gravity in vacuumSubstitute the given parameters and solve for v;
v = 0 + 9.8(4)
v = 39.2 m/s
Thus, the velocity of an object that has been falling freely in a vacuum
for 4 seconds is 39.2 m/s.
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1. What type of energy transformation best fits what happens in a paper shredder?
Answer:
electrical- mechanical
Explanation:
Smartness 1,000
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A motorcyclist started a race from the start line and from rest, and accelerated with the acceleration of 3m/s2 for 8 secs. Then he was moving with a constant velocity for 2 secs. What was the racer’s position from the start line after 9+2 seconds from the start of the race?
Answer:
I dont even know my g
Explanation:
Like i cant even help u
Select the best answer from the choices below. Light has many properties of waves but sometimes it also behaves like: A photon Polarized light ultraviolet rays schem of particles
Answer:
The correct option is;
Stream of particles
Explanation:
Light can be observed to behave as stream of particles in the physical phenomenon of blackbody radiation and photoelectric effect whereby electrons are ejected by the impact of light such that the number of electrons ejected is a function of the amount of photons transmitted which are absorbed by the electrons before they can be ejected
The energy of the photons depends on the frequency of the light source of the photons, while the electrons are ejected when the energy of the photon is up to their threshold value
As such light can also be considered as behaving as a stream of particles called photons.
What is the center stone of an arch on a bridge called?
Thanks so much.
Answer:
keystone
Explanation:
Antimony is like a nonmetal in that it is a brittle, crystalline solid, has poor electrical and heat conductivity, and has a low boiling point. However, it is also like a metal because of its shiny silver appearance and ability to form alloys.
Which of the following statements best describes antimony?
Answer:
Antimony is metalloid
Explanation:
From the properties of the metals given, we can conclude that antimony is pure a metalloid.
A metalloid has the properties of metals and non-metals.
Most metalloids will only conduct heat and electricity under certain conditions so they are poor conductors. As expected of a metal, it should be malleable and ductile but antimony is brittle and a crystalline solid. Although, it can form an alloy. We can see that most of the properties of this metal is in between those of true metals and non-metals. Therefore, antimony is a metalloid.Alisa needs to make some hot tea for her ill mother. She uses some ice-cold water from the freezer and heats it up in the kettle. As she hears the teapot whistling, she asks herself, “How is the motion of the ice water’s particles changing as the hot tea is being made?”
What is the best answer to Alisa’s question?
Answer choices
A. The particles in the cold water moved at a slow rate until a decrease in temperature caused an increase in particle motion in the hot tea.
B. The particles in the cold water moved at the same rate until an increase in temperature caused a decrease in particle motion in the hot tea.
C. The particles in the cold water moved at a high rate until an increase in temperature caused a decrease in particle motion in the hot tea.
D. The particles in the cold water moved at a slow rate until an increase in temperature caused an increase in particle motion in the hot tea.
:)
Answer:
the answer is b
Explanation:
The particles in the cold water moved at a slow rate until an increase in temperature caused an increase in particle motion in the hot tea.
According to the kinetic theory of matter, the particles that compose matter are in constant random motion. The particles collide frequently with each other as well as with the walls of the container.
The temperature of the system refers to the average kinetic energy of the molecules of the body. At a lower temperature, the speed of the particles of water is slow. As the temperature increases, more kinetic energy is imparted to the molecules of water and they move faster.
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A set of three resistors are set up in parallel. The resistor values are R1 = 3.0 Ohms, R2 = 11.0 Ohms, and R3 = 7.5 Ohms.
What is the total resistance of this circuit?
a
1.79 Ohms
b
0.60 Ohms
c
1.12 Ohms
d
2.97 Ohms
Answer:
A) 1.79ohms
Explanation:
Total resistance of resistors in parallel is given by ;
1/R = 1/R1 + 1/R2 +1/R3
Put in the values and make R the subject
14.4 K.L of heat is required to raise the temperature of
a 12 kg substance from 275 K to 275.5 K. Identify the
substance
Answer:
The substance is Ethanol
Explanation:
To solve this problem we must use the expression of thermal energy calculation that relates the mass of a body with the specific heat of this and the temperature difference.
Q = m*Cp*(T_f - T_i)
where:
Q = amount of heat = 14.4 [kJ]
m = mass = 12 [kg]
Cp = specific heat [kJ/kg*K]
T_f = final temperature = 275.5 [K]
T_i = initial temperature = 275 [K]
Therefore we need to calculate Cp, and then compare this with the values in the given table attached.
Cp = 14.4/(12*(275.5 - 275))
Cp = 2.4 [kJ/kg*K]
Now we compare the Cp with the values given in the table.
So the substance is Ethanol
The majority of the population in the United States speak __________.
Answer:
english or spanish
Explanation:
Answer:
English
Explanation:
Serafina has finished cleaning and organizing her bedroom and put away the last of her shoe storage containers. She has a lifting force of 25 N and moved the container a distance of 3 meters. How much work did she do? (Make sure you include proper units in your answer.)
Answer: Work DONE =- 75Nm = 75 Joules
Explanation:
Work is done when a force applied to an object, cause a displacement by causing such object to move Thus work is calculated by multiplying the force by the distance moved by the object.
From the question,
Given that force= 25N
Distance = 3m
therefore
Work = Force x Distance
25N X 3m =
= 75 Nm = 75 Joules
do light waves move parallel
Answer: Sound waves are examples. parallel - For the purposes of this Activity Object, parallel is defined as moving in the same direction. Specifically in the case of longitudinal waves, particles move forward and back parallel to the direction of the travelling wave. ... Some examples are ocean waves and light waves.
Explanation:
Lionel explores electromagnetic induction using the procedure shown. 1. Move the magnet quickly into the right end of a solenoid. 2. Hold the magnet in the solenoid for 3 s. 3. Move the solenoid slowly to the left away from the magnet. What should Lionel observe during his investigation?
Answer:
B. A large current forms, drops to zero, then a smaller current forms in the opposite direction
Explanation:
The results of Lionel observation about electromagnetic induction is as follows:
In the first step, a large current will form because of the fast or quick movement of the magnet into the right end of a solenoid that generates a induces emf.
In the second step, the magnet was in rest position for 3 s so the current drops to zero because according to Faraday's law, no voltage will be generated if the magnet held stationary and no voltage means no current.
In the third step, smaller current forms in the opposite direction as the magnet is slowly moving away from the solenoid generating a smaller voltage.
Hence, the correct answer is "B."
Answer:
B
Explanation: