The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them. This means that the force of gravity increases with mass, but decreases with increasing distance between objects.
When a wave strikes and object and bounces off . ( example echo)
A. Medium
B. Refraction
C.Reflection
D. Interference
Answer:
C. reflection
Explanation:
reflection occurs when a wave strikes an object and bounces off of it
When a wave strikes an object and bounces off, it is called reflection.
Hence, the correct option is C.
This is similar to what happens when sound waves strike a surface and bounce back, resulting in an echo.
Reflection occurs when a wave encounters a boundary or an obstacle and changes direction, returning back into the medium it came from.
The angle of incidence (the angle at which the wave strikes the surface) is equal to the angle of reflection (the angle at which the wave bounces off the surface).
Therefore, When a wave strikes an object and bounces off, it is called reflection.
Hence, the correct option is C.
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Question 2 (2 points)
Which of the following is a true statement about mass and weight? (2 points)
a
Mass is a measure of how much matter an object has, while weight is a measure of
how much space the object takes up.
Mass will not change based on location, while weight will change based on
gravitational pull
b
Mass is a measure of a gravitational pull on an object, while weight is a measure of
how much matter is an object has,
Mass is proportional to the force of gravity, while weight is proportional to the
amount of mass,
d
Answer:
B. Mass will not change based on location, while weight will change based on gravitational pull.
Answer:
B
Explanation:
took the test
terms involved in s=ut+1/2at^2
Explanation:
The terms involved in S = ut + 1/2at²
S = displacement
u = initial velocity
a = acceleration
t = time.
Hope it will help :)
Answer:
the distance traveled or displacement (s) of an object using its initial velocity (u), acceleration (a), and time (t) traveled.
a 20 of of ice at 0c is dropped into water at boiling point, specific heat capacity of water =4200 J/kg•c, sepesific latent heat of fusion (Lf) =3.3x10^(5) J/kg calculate the amount of heat energy needed to complete the previous conversion
Answer:
15 KJ
Explanation:
The quantity of heat (Q) required is given as:
Q = mcΔθ + mL
where m is the mass of ice, c is its specific heat capacity, L is its specific latent heat andΔθ is the change in temperature.
Given: m = 20g, temperature of ice = 0[tex]^{o} C[/tex], specific heat capacity of water = 4200 J/kg[tex]^{o} C[/tex], latent heat of fusion of ice = 3.3 x 10^(5) J/kg, temperature of water = 100[tex]^{o} C[/tex].
Q = m (cΔθ + L)
= 0.02(4200 x (100) + 330000)
= 0.02(420000 + 330000)
= 0.02 (750000)
Q = 15000
Q = 15000 Joules
Q = 15KJ
The quantity of heat needed to complete the conversion is 15 KJ.
A boy pushed horizontally a 3.5 kg plastic chair across the slippery floor. If
the acceleration of the plastic chair is 2.2 m/s2 to the left, what is the net force
exerted on the plastic chair?
Answer:
7.7 N to left or -7.7 N
Explanation:
slippery floor means no frictional force
Equation for force
F = m * a , where F is force, m is mass in kg, and a is acceleration in m/s²
F = 3.5 * -2.2 m/s² = -7.7 N
How many newtons is the force of gravity g , acting on an apple with mass m = 200 g?
Answer:
Mass of the apple is 200g or 0.2 kg
Force acting on it will be,
Force= Mass× acceleration due to gravity
Force= 0.2×9.8 Newton= 1.96 Newton
Answer:
2 N
Explanation:
The question requires you to express the weight of the apple into Newton
1 kg = 10 N
200g = 200/1000 = 0.2 kg
1 kg = 10 N
0.2 kg = ?
0.2 * 10 = 2 N
You drop a bowling ball and it falls with an acceleration of 10 m/s2. The ball has a mass of 5 kg. How much force is causing the ball to fall?
Explanation:
Given
acceleration (a) = 10 m/s²
mass (m) = 5 kg
Force (F) = ?
We know
F = m * a
= 5 * 10
= 50 Newton
The force is 50 N
Hope it will help :)
Answer:
[tex]\boxed {\boxed {\sf 50 \ Newtons }}[/tex]
Explanation:
Force can be found using the following formula.
[tex]F=m*a[/tex]
where F is the force, m is the mass, and a is the acceleration.
1. Define Values
We know the acceleration of the bowling ball is 10 m/s² and the mass is 5 kilograms.
[tex]a= 10 \ m/s^2 \\m= 5 \ kg[/tex]
2. Calculate Force
Substitute the values into the formula.
[tex]F= 5 \ kg * 10 \ m/s^2[/tex]
Multiply.
[tex]F= 50 \ kg*m/s^2[/tex]
1 kilogram meter per square second is equal to 1 Newton. Our answer of 50 kg*m/s² is equal to 50 N[tex]F=50 \ N[/tex]
The force causing the ball to fall is 50 Newtons
Which of the following best explains why the noble gases are less likely to chemically
bond with other elements?
A They are all non-metals. |
B They are all rare elements.
C They all have a full outer shell of electrons.
D They have the highest atomic number in the row.
Answer:
a
Explanation:
3. Electrons are the only part of an atom that can be transferred between materials. True or
False?
Answer:
True
Explanation:
Electrons can be transferred between materials as in chemical reactions solid substances lose electrons while other elements gain electrons to balance the electrons in reaction.It occurs by conduction,polarization and friction.
Help plz!! I’ll give brainlist!! I need it fast plz
Answer:
1.A
2.E
3.C
4.i think A
Explanation:
How would the gravitational force between the earth and the moon change if the moon had twice the mass?
Explanation: The moon's gravity, combined with the waltz of Earth and the moon around their center of mass, forces the oceans into an oval shape, with two simultaneous high tides. ... If the moon were half its mass, then the ocean tides would have been correspondingly smaller and imparted less energy to it.
Pls help I think it's pretty easy
Electromagnetic waves transfer energy and are produced by _____.
Tom skis at an average speed of 5 m/s. How many mins does it take for Tom to ski 4050 m.
A rocket travels 200,000 meters in a time of 4.40 seconds . what of the speed of the rocket ?
Answer:
the speed of the rocket is 45454.5455
Explanation: Because the speed formula is basically just distance/ divided by time all you need to do is divide 200,000 meters by 4.40 seconds. And then thus you will get the speed.
Answer:
45454.55 m/s
Explanation:
[tex]S=\frac{d}{t}[/tex]
= [tex]\\S=\frac{200000}{4.40}[/tex]
=45454.55 m/s
find the factor of the number 1.30
1 3/10 because 130 is greater than 100 we have simplified this fraction even further to a mixed fraction.
Please provide positive integer to calculate.
A test pilot flies with an acceleration of 5 g. What is his acceleration in meters
per second squared?
A. 5 m/s2
B. 9.8 m/s2
C. 49 m/s2
D. 14.8 m/s2
Answer:
C. 49 m/s^2
Explanation:
1 G = 9.81 m/s^2
so 5 * 9.81 = 49.05
or C. 49 m/s^2
All sound waves need a(n) _______________________________________ to travel through. 4. _____________________ and ___________________ can be used to describe a sound wave.
Answer:
Material medium
compressions and rarefactions
Explanation:
A sound wave is an example of a mechanical wave. All mechanical waves require a material medium for propagation. The medium for the propagation of sound is air. This is the reason why, if you cover your mouth, it will be difficult for another person to hear whatever you are saying.
Sound is also a longitudinal wave. Longitudinal waves are described in terms of compressions and rarefactions. Compressions refer to areas where air molecules crowd together while rarefactions refer to areas where the air molecules spread out.
When you walk into a dark room and turn the light on, do the electrons travel all the way from the switch to the light?
Answer:
Yes
Explanation:
This is because for the light to come on, electric current has to flow through it which is due to electron motion. As the electrons move through the light, it turns electrical energy to light energy, so the light comes on.
Write a sentence on how these words are used in real life situations
1. Average Velocity
2. Instantaneous Velocity
3. Acceleration
Answer:
Explanation:
You can approach an expression for the instantaneous velocity at any point on the path by taking the limit as the time interval gets smaller and smaller. Such a limiting process is called a derivative and the instantaneous velocity can be defined as.#3
For the special case of straight line motion in the x direction, the average velocity takes the form: If the beginning and ending velocities for this motion are known, and the acceleration is constant, the average velocity can also be expressed as For this special case, these expressions give the same result. Example for non-constant acceleration#1
Two positive charges 12×10^-6C and 8×10^-6 are 10cm apart. Find the workdone in bringing them 4cm together
Answer:
W = 5.76 J
Explanation:
Given that,
Charge 1, [tex]q_1=12\times 10^{-6}\ C[/tex]
Charge 2, [tex]q_2=8\times 10^{-6}\ C[/tex]
The distance between charges is 10 cm.
Initial distance = 10 cm = 0.1 m
Final distance = 10 cm - 4 cm = 6 cm = 0.06 m
We need to find the work done in bringing the 4 cm together.
We know that,
Work done = change in kinetic energy
[tex]W=kq_1q_2(\dfrac{1}{r_2}-\dfrac{1}{r_1})\\\\\text{Put all the values}\\\\W=9\times 10^9\times 12\times 10^{-6}\times 8\times 10^{-6}(\dfrac{1}{0.06}-\dfrac{1}{0.1})\\\\W=5.76\ J[/tex]
So, the required work done is 5.76 J.
An inclined plane is set at an angle of 29 degrees above horizontalWhat is the acceleration of a 420 g block of ice sliding down the inclined plane? Assume no friction
The net force parallel to the plane is
∑ F = m g sin(29°) = m a
where
m = mass of the block
g = magnitude of the acceleration due to gravity, 9.8 m/s²
a = mag. of acceleration of the block
where we take the direction of the block's sliding down the plane to be positive. Then
a = g sin(29°) ≈ 4.8 m/s²
Will anyone please help me solve this physics Problem?
Answer:
I. Clockwise moment = 150 Nm
II. Anticlockwise moment = 400 Nm
III. 200 N
III. The anticlockwise moment.
Explanation:
From the question given above, we can obtain the answers to the questions as follow:
I. Determination of the clockwise moment.
Distance (d) = 1.5 m
Force (F) = 100 N
Clockwise Moment =?
Moment = Force × distance.
Clockwise moment = 100 × 1.5
Clockwise moment = 150 Nm
II. Determination of the anticlockwise moment.
Distance (d) = 2 m
Force (F) = 200 N
Anticlockwise Moment =?
Moment = Force × distance.
Anticlockwise moment = 200 × 2
Anticlockwise moment = 400 Nm
III. Determination of who will turn the sea saw.
Clockwise moment = 150 Nm
Anticlockwise moment = 400 Nm
Since the anticlockwise moment is greater than the clockwise moment, it therefore means that the anticlockwise moment will turn the sea saw.
Distance is a __________ quantity, as it has no direction, only magnitude
Answer:
-scalar
Explanation:
-A scalar is any quantity that has a magnitude, but no direction
-quantities with no specified direction.
hope it helps:)
An angle of refraction is the angle between the refracted ray and the
o incident ray.
o normal.
O medium.
O boundary
Answer:
b) normal
Explanation:
The angle of refraction (transmission) Θt is the angle between the refracted ray and the normal N'. 2. When a light ray hits a surface normally, the angle between the incident ray and the normal is 0, so Θi = 0. Since the angle of reflection equals the angle of incidence, Θr= 0.
The angle of refraction is the angle between the refracted ray and the normal, which is option B.
What is the angle of refraction?When light travels from one medium to another medium with a different refractive index, it changes direction.
The angle of refraction is the angle between the refracted ray and the normal, which is an imaginary line perpendicular to the boundary between the two media at the point of incidence. The incident ray is the incoming ray of light that strikes the boundary between the two media.
The medium refers to the substance through which light is passing, and the boundary is the surface separating the two media.
However, the angle of refraction is not related to the incident ray or the boundary, but rather the norm.
Thus, the correct answer would be an option (B) normal.
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3. What is a manometer used to determine?
A the difference between two densities
B the difference between two forces
C the difference between two heights
D the difference between two pressures
Answer:
D the difference between two pressures
Explanation:
A manometer is a device used to measure the difference between the pressure in a place. Manometer is solely used to determine gas pressure.
The device compares gas pressure to atmospheric pressure at any given point. It measures pressure against a fixed reference or with respect to a differential pressure in a place. The column of liquid is the medium it uses to measure the pressure differences. Pressure is the force exerted per unit area.A element source has a decayed constant of 13.6pico per second. Calculate the half life of this element.
Answer:
5.1 x 10¹⁰s
Explanation:
Given parameters:
Decay constant = 13.6 x 10⁻¹²/s
Unknown:
Half life of the element = ?
Solution:
From the decay constant, we can find the half-life of this radioactive element.
Half-life = [tex]\frac{0.693}{decay constant}[/tex]
Half-life = [tex]\frac{0.693}{13.6 x 10^{-12} }[/tex] = 5.1 x 10¹⁰s
A 56 kg object is attached to a rope, which can be used to move the load vertically.
a. What is the tension force in the rope when the object moves upward at a constant velocity?
b. What is the tension force in the rope when the object accelerates downward at a constant
acceleration of 1.8 m/s2
c. What is the tension force in the rope when the object accelerates upward at a constant
acceleration of 1.8 m/s2
Answer:
a) T=549.36N Upwards
b) T=448.56N Upwards
c) T=650.16N Upwards
Explanation:
The very first thing we can do to solve this problem is to draw a free body diagram we can use to analyze the situation (see attached picture).
On the diagram we can see there are only two forces acting on the object: the tension of the rope and the weight of the object itself.
a)
Since the object is moving at a constant speed, this means that its acceleration will be zero. So we can do a sum of forces like this:
[tex]\sum F=0[/tex]
T-W=0
T=W
T=mg
[tex]T=(56kg)(9.81m/s^{2})[/tex]
T=549.36N upwards
b)
For part b, since the object is accelerating downwards, we wil say that it's acceleration is negative, so [tex]a=-1.8m/s^{2}[/tex]
so we can do a sum of forces again:
[tex]\sum F=ma[/tex]
so
T-W=ma
T=ma +W
T=ma+mg
T=m(a+g)
and now we substitute:
[tex]T=(56kg)(-1.8 m/s^{2}+9.81 m/s^{2})[/tex]
which yields:
T=448.56N upwards (in this particular case, the tension always goes upwards)
c)
Since the object is moving upwards, we can say that its acceleration will be positive, so [tex]a =1.8m/s^{2}[/tex]
we can take the solved equation we got on the previous part of the problem, so we get:
T=m(a+g)
[tex]T =(56kg)(1.8 m/s^{2}+9.81 m/s^{2})[/tex]
which yields:
T=650.16N upwards
The tension force in the rope when the object moves upward at a constant velocity is 548.8 N.
The tension force in the rope when the object accelerates downward at a constant acceleration is 448 N.
The tension force in the rope when the object accelerates upward at a constant acceleration is 649.6 N.
The given parameters:
Mass of the object, m = 56 kgThe tension force in the rope when the object moves upward at a constant velocity;
T = ma + mg
at constant velocity, a = 0
T = mg
T = 56(9.8)
T = 548.8 N
The tension force in the rope when the object accelerates downward at a constant acceleration of 1.8 m/s².
T = mg - ma
T = m(g - a)
T = 56(9.8 - 1.8)
T = 448 N
The tension force in the rope when the object accelerates upward at a constant acceleration of 1.8 m/s².
T = mg + ma
T = m(g + a)
T = 56(9.8 + 1.8)
T = 649.6 N
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Adjetivo utilizado para calificar la componente de la aceleración en la dirección del movimiento de un punto que se mueve según una circunferencia.
10 letras
Answer:
Tangencial.
Explanation:
El adjetivo empleado es tangencial, cuya longitud es diez caracteres. La aceleración tangencial es el componente del vector aceleración que es paralelo a la dirección del vector velocidad de un punto que se mueve sobre una circunferencia.
La aceleración tangencial tiene la función de cambiar la magnitud del vector aceleración.
I feel death among us
same but who knows how 2021 might go
Answer:
same....
Explanation:
Wanna be friends?
If a missile is launched from the equator toward an object in the Northern Hemisphere, should it be aimed to the left, to the right, or directly at its target? Why?
Answer:
Must be aimed to the left
Explanation:
Coriolis effect deflects wind or any moving item which has no contact with earth and has substantial distance to cover and moving at a substantial altitude. Coriolis effect deflectd the object to the right in the northern hemisphere. Therefore, missile must be aimed to the left, to nullify the coriollis effect.