Answer: Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion.
an object is moving to the right and speeding up. Its acceleration is
A. positive
B. Negative
C. zero
Answer:
Positive
Explanation:
Answer:
positive
Explanation:
i'm reallt sorry if I'm wrong
A player kicks up a ball at an angle θ with the horizontal. The horizontal range is maximum when θ is equal to
Answer:
The horizontal range is maximum when θ is equal to 45°
Explanation:
Projectile Motion
It's known as the type of motion that experiences an object that is projected near the Earth's surface and moves along a curved path exclusively under the action of gravity.
Being vo the initial speed of the object, θ the initial launch angle, and [tex]g=9.8\ m/s^2[/tex] the acceleration of gravity, then the maximum horizontal distance traveled by the object (also called Range) is:
[tex]\displaystyle d={\frac {v_o^{2}\sin(2\theta )}{g}}[/tex]
Since the sine of an angle is bounded between -1 and 1, the maximum range will occur when the sine is 1:
[tex]\sin(2\theta)=1[/tex]
The only angle between 0° and 360° whose sine is 1 is 90°, thus:
[tex]2\theta=90^\circ[/tex]
Solving:
[tex]\theta=45^\circ[/tex]
The horizontal range is maximum when θ is equal to 45°
The horizontal range is maximum for the value of angle equivalent to [tex]45^{\circ}[/tex].
Given data:
The player kicks the ball with an angle [tex]\theta[/tex] with the horizontal.
The given problem is based on the concept and fundamentals of projectile motion. In a projectile motion, the horizontal range is the horizontal distance covered by an object during its trajectory.
The mathematical expression for the horizontal range is given as,
[tex]R = \dfrac{u^{2}sin2 \theta}{g}[/tex]
Here,
R is the horizontal range.
u is the initial speed.
And g is the gravitational acceleration.
Clearly, if we need maximum horizontal range, then we need to have the maximum value of sine. So if,
[tex]\theta =45^{\circ}[/tex]
[tex]sin2 \theta=sin90[/tex] = 1
So the maximum range is,
[tex]R = \dfrac{u^{2}sin(2 \times 45^{\circ})}{g}\\\\R = \dfrac{u^{2} \times sin 90^{\circ}}{g}\\\\R = \dfrac{u^{2}}{g}[/tex]
Thus, we can conclude that the horizontal range is maximum for the value of angle equivalent to [tex]45^{\circ}[/tex].
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What is the density of a billiard ball that has a volume of 100 cm3 and a mass of 250 g?
Answer:
The answer is 2.50 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 250 g
volume = 100 cm³
So we have
[tex]density = \frac{250}{100} = \frac{5}{2} \\ [/tex]
We have the final answer as
2.50 g/cm³Hope this helps you
electric bulb connected to a 220 volt supply line draw a current of 0.05 ampere calculate the amount of coulomb super second following to the bulb
You don't need to calculate anything.
You said "0.05 Ampere".
"Ampere" means "coulomb per second".
Which of the following is one area that geography plays a roll in the history of Europe
A goose is flying due south at 20 km/hr, the goose is flying into a 15 km/hr due north wind. What is the gooses resultant velocity?
Answer:
5 km/hr due south
Explanation:
We need to subtract the two velocities due to the fact that they are in opposite directions (one due south and the other one due north). Then, for an observer located on earth, the goose will be flying at :
20 km/hr - 15 km/hr = 5 km/hr
If there is 10% sales tax on a car costing $18,000
How much is the sales tax?
O $180
O $1800
O $1.80
O $800
Answer:
180
Explanation:
i think
hELP URGENT PLEASEE!!!
Answer:
1. Solid, liquid, gas, plasma
3. latent heat of vaporization
4. melting
6. heat
7. amount of heat transferred when 1g of a substance melts or freezes
Answer:
1. Solid, liquid, gas, plasma
2. In a solid and liquid, the particles are close together. In a solid, the particles are packed close together and are held in a fixed position. ... In liquids, particles are usually almost as close to each other as in solids.
3. latent heat of vaporization
4. melting
5. As the temperature falls, the particles slow down. If a liquid is cooled sufficiently, it forms a solid.
6. heat
7. amount of heat transferred when 1g of a substance melts or freezes
Explanation:
Textbook online
Lien is pushing a box across a table. She used a force of 100 N to get the box moving. Which force did she overcome to get the box moving?
a)the downward force of gravity on the box
b)the upward force of the table on the box
c)the reaction force on the box
d)the push force on the box
We have that from the options, the force require to move the table will be the Reaction force.i.e the force that will get a reaction out of the table i.e is Motion
The reaction force on the box
Correct Option is C
From the question we are told
Lien is pushing a box across a table. She used a force of 100 N to get the box moving
Generally The Force Requird to Move a table is greater than the contiunes force applied to it to en sure it contines in Motion.
Having said that Newtons Third law states for every action there most be an equal and opposite reaction
Therefore
From The options the force require to move the table will be the Reaction for.that is the force that will get a reaction out of the table i.e is Motion
Correct Option is C
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PLEASE HELP, TELL ME THE PROPERTIES OF THESE THREE STATES OF MATTER WILL GIVE BRAINLIEST
I) Name of State of Matter: Solid
a) Property of this State of Matter:
b) Property of this State of Matter:
c) Property of this State of Matter:
II) Name of State of Matter: Liquid
a) Property of this State of Matter:
b) Property of this State of Matter:
c) Property of this State of Matter:
III) Name of State of Matter: Gas
a) Property of this State of Matter:
b) Property of this State of Matter:
c) Property of this State of Matter:
Answer:
I) Name of State of Matter: Solid
a) Property of this State of Matter: Definite shape and volume.
b) Property of this State of Matter: Generally have a higher density.
c) Property of this State of Matter: Diffusion of one solid into another solid is characteristically slow.
II) Name of State of Matter: Liquid
a) Property of this State of Matter: Definite volume but no definite shape.
b) Property of this State of Matter: Vaguely compressible; Barely compressible.
c) Property of this State of Matter: Flow from a higher level to a lower level.
III) Name of State of Matter: Gas
a) Property of this State of Matter: Easily compressible.
b) Property of this State of Matter: Expand to fill containers.
c) Property of this State of Matter: They are able to occupy far more space than liquids or solids.
Answer:
The theree state of matter is
1.solid.
2.liquid.
3.gas.
Explanation:
If you know the amplitude of a wave, you know the distance from what
Answer:
You know the distance from mean position.
Answer:
the equilibrium of one wave to the crest of the same wave.
Explanation:
The amplitude of a wave corresponds to the distance between the equilibrium position of the wave and the crest of the same wave (or the distance between the equilibrium position and the through of the same wave), therefore we see that this definition corresponds to option C,
the equilibrium of one wave to the crest of the same wave.
The Indianapolis Motor Speedway has four banked curves, each of which forms a quarter of a circle. Suppose a race car speeds along one of these curves with a constant tangential speed of 75.0 m/s. Neglecting the effects due to the banking of the curve, the centripetal acceleration on the car is 22.0 m/s2. What is the radius of the curve?
Answer:
r = 255.68 m
Explanation:
When a body moves in a circular path, an acceleration, due to constant change in its direction, is developed, known as centripetal acceleration. The centripetal acceleration acts towards the center of the circular path. The formula to calculate the centripetal acceleration is given as follows:
ac = v²/r
where,
ac = centripetal acceleration = 22 m/s²
v = tangential speed = 75 m/s
r = radius of curve = ?
Therefore,
22 m/s² = (75 m/s)²/r
r = (75 m/s)²/(22 m/s²)
r = 255.68 m
what are the aerodynamics of a cow
Answer:
32
Explanation:
Answer:
There's nothing quite like placing random objects through some computational fluid dynamics software. As we can see, the forehead of the cow experiences a zone of high pressure, since a lot of the air is deflected from the front of the nose and straight to the head.
Explanation:
1.A storm is moving toward your house at a speed of 30 km/hr. It is now 60 km away from your house. In what time will the storm reach your house?
can someone please write this analysis of the force magnitudes calculated in problems 1 and 2 for me?
Answer:
Explanation:
i didnt got what you had said about qn 1 and 2
qn 10 :pic given
qn 11;F = m * a
The apple's acceleration is not influenced by the acceleration due to gravity for this question. In real life it most certainly is influenced by gravity.
F = m * a
F = 10 Newtons.
a = 6 m/s^2
m = 10/6 = 1.66 kg.
Potential energy calculation - MxGxH. Gravity equals 10. How much
potential energy does a 5 gram golf ball that is falling from 40 ft have? Use
your calculator if need be. *
Answer:
Ep = 0.6095 [J]
Explanation:
As defined in the problem statement, potential energy is defined as the product of mass by gravity by height. But first we must convert all the values given to measures of the international system (SI)
g = gravity = 10 [m/s^2]
h = elevation = 40 [ft] = 12.19 [m]
m = mass = 5 [g] = 0.005 [kg]
Ep = potential energy [J]
Ep = 0.005*10*12.19 = 0.6095 [J]
A car stops with an acceleration of -20 m/s/s in 8 seconds. How far did it go while stopping?
Answer:
640 m.
Explanation:
The following data were obtained from the question:
Acceleration (a) = –20 m/s/s
Time (t) = 8 s
Final velocity (v) = 0 m/s
Distance (s) =.?
Next, we shall determine the initial velocity (u) of the car. This can be obtained as follow:
Acceleration (a) = –20 m/s/s
Time (t) = 8 s
Final velocity (v) = 0 m/s
Initial velocity (u)
a = (v – u) / t
–20 = (0 – u) / 8
–20 = – u / 8
Cross multiply
–20 × 8 = – u
– 160 = – u
Divide both side by – 1
u = – 160 / – 1
u = 160 m/s
Finally, we shall determine the distance travelled by the car before stopping as follow:
Time (t) = 8 s
Final velocity (v) = 0 m/s
Initial velocity (u) = 160 m/s
Distance (s) =.?
s = (v + u)t /2
s = (0 + 160) × 8 /2
s = (160 × 8) /2
s = 1280 / 2
s = 640 m
Therefore, the car travelled 640 m before stopping.
RETAKE - A push or a pull that causes an object to change its motion is called!
:: inertia
:: a force
:: momentum
:: gravitational field force strength
:: mass
Answer: Force
Explanation: Force is defined as a push or pull acting on an object
Answer:
Force is defined as a push or pull acting on an object. Forces include gravity, friction, and applied force. Force causes changes in the speed or direction of motion. These changes are called acceleration.
Explanation:
The energy required to change liquid at it boiling point to a gas is
Answer:
latent heat, also called the heat of vaporization, is the amount of energy necessary to change a liquid to a vapour at constant temperature and pressure. The energy required to melt a solid to a liquid is called the heat of fusion, and the heat of sublimation is the energy
Explanation:
: A person walks 10 meters North, the 5 meters South. His displacement is: _____________. His distance is:
Answer:
Displacement = 5 meters North
Distance = 15 meters
Explanation
If he walks 10 meters North than his displacement would be 10 meters North. But since he walked 5 meters South it changes his displacement to 5 meters North because that is how far he is away from his starting point.
Hope this helps
True or false. A high gear ratio = more speed = more force.
Answer:
False
Explanation:
I took the test and true was incorrect so the answer is false
hope this helps
Answer:
False
Explanation:
False. A high gear ratio = less speed = more force
What are the 4 states of matter
There are four natural states of matter: Solids, liquids, gases and plasma.
Answer:
There are 4 states of matter. Solid, liquid, gas, and plasma.
Explanation:
Plasma isn't that important, the main ones are solid, liquid, and gas.
An ocean scientist plans to spend several days underwater in a submarine. Doctors on land will monitor her body to make sure she is healthy during her trip. What is one way doctors will be able to tell whether her body is healthy enough to do all her tasks while she is in the submarine?
Answer:
The doctors could see if her cells are getting the molecules they need from food and air
Explanation:
The doctors could see if her cells are getting the molecules they need from food and air. Doing so allows the doctors a general overview of how well her body's biological systems are performing since the basic necessities of the human system are food and oxygen. Therefore if the body is receiving both food and oxygen properly and distributing it properly and efficiently as well without any problems then the most likely outcome is that she is healthy enough to perform her tasks in the submarine under more pressure.
Answer:
The doctors could see if her cells are getting the molecules they need from food and air
Explanation:
The periodic table displays
A.
only the important compounds that exist in the world.
B.
only the important elements that exist in the world.
C.
all of the known elements that exist in the world today.
D.
all of the known compounds that exist in the world today.
Answer:
C
Explanation:
the periodic table of elements only consist of elements and all of the elements found in the world
A woman performs 2000 J of work in order to push a cart full of groceries 50 meters. How much force did she apply to the cart?
Answer:
workdone = force x displacement
force = work done /displacement
= 2000 / 50
= 40 N .
1. Sally rides her bike to school which is 8.0 km from her house. If it takes 15 minutes for her
to reach her destination, what is her average speed in km/hr?
Alfredo is trying to measure the speed that cars travel down the street outside of his house. Outside his house there is a stoplight, and then another stoplight about ½ mile down the road. Alfredo says, "I can use my watch with a second hand to time the cars from when they leave the first light and stop at the next light. To find the speed I can just take the ½ mile distance and divide by the time." What are two flaws with Alfredo's plan which will not allow him to see how many cars are speeding on his street? Also explain how you would revise the experiment to avoid these problems
Answer:
drastic assumption that the car moves along the path at the same speed,
hese failures, it would be necessary to take the time of each type of trajectory, accelerated, constant and decelerated, this method is not easy since it implies knowing the distance in each type of movement,
Explanation:
In this exercise Alfredo makes a drastic assumption that the car moves along the path at the same speed, in reality the car when leaving the first traffic light accelerates until it reaches a speed, then remains constant and decelerates to be able to stop at the second traffic light.
To overcome these failures, it would be necessary to take the time of each type of trajectory, accelerated, constant and decelerated, this method is not easy since it implies knowing the distance in each type of movement, another method would be that the two traffic lights were in green so that the vehicle can run with constant speed throughout the trajectory
Does a parachute a free fall give reason
Answer:
no
Explanation:
because there is nothing holding you back
A skater increase her velocity from 3 m/sec to 18 m/sec in 6 seconds.what is the skaters acceleration
It took a squirrel 0.50 s to run 5.0 meters leftward to a nearby tree while maintaining a constant acceleration. The squirrel was running 15 m/s leftward when it reached the tree. What was the squirrel's initial velocity?
It took a squirrel 0.50 s to run 5.0 m leftward when it reached the tree while maintaining a constant acceleration. The squirrel was running 15 m/s leftward when it reached the tree.
What was the squirrel's initial velocity?
Answer: -5
The initial velocity of the squirrel is 5m/s. Initial velocity is a vector quantity.
What is Acceleration?Acceleration is the rate of change of the velocity of an object with respect to the time. Acceleration is the vector quantity.
The initial velocity of the object can be calculated by the following equation:
s = 1/2 (u + v) t
5.0 = 1/2 (u + 15) × 0.50
10 = (u + 15) × 0.50
10 / 0.50 = (u + 15)
20 = (u + 15)
u = 20 - 15
u = 5m/s
Thus, the squirrel's initial velocity before getting startled is 5 meters per second.
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