Answer: 4.5 billion years
Explanation:
Some of the water molecules in your drinking glass were created more than 4.5 billion years ago, according to new research.
That makes them older than the Earth, older than the solar system — even older than the sun itself.
If a positively charged rod is brought near the knob of a positively charged electroscope, the leaves of the electroscope will...
A) converge, only
B) diverge, only
C) first diverge, then converge
D) first converge, then diverge
Answer:
B
Explanation:
if a positively charged rod is brought near the knob of a neutral electroscope, it will attract some electrons up from the leaves onto the knob. That process causes both of the leaves to be positively charged (excess protons), and the leaves will diverge.
Two people are sitting on wheeled chairs 1 metre apart. Person A is holding a 2kg ball. Person A throws the ball to Person. What happens to person A? Explain.
a.) their chair stays still
b.) chair rolls backwards
c.) chair rolls forwards
Answer:
B - Person A's chair rolls backwards.
Explanation:
This can be seen simply through the Conservation of Momentum. When the ball is thrown to be, the ball's momentum(+m) is transfererd to B, so B's chair moves forward(think about it - it makes sense, doesn't it?), meaning A's chair moves backwards.
So, B.
EXTRA TIP: Try drawing a diagram to help you!
true or false force vectors have direction only
Answer:
The answer is true
Explanation:
:D
Un motor realiza un trabajo de 5000 j en 20 s a) ¿ cual es la potencia del motor ?B)¿en cuanto tiempo desarollan el mismo trabajo una maquina de 15 w ?
Answer:
a. Potencia = 250 Watts
b. Tiempo = 333.33 segundos
Explanation:
Dados los siguientes datos;
Energía = 5000 Joules
Tiempo = 20 segundos.
Para encontrar el poder;
Poder = energía/tiempo
Potencia = 5000/20
Potencia = 250 Watts
B. ¿Para saber cuánto tarda una máquina en realizar el mismo trabajo;
Dado: potencia = 15 W
Tiempo = energía/poder
Tiempo = 5000/15
Tiempo = 333.33 segundos
If a red star and a blue star both have the same radius and both are the same distance from Earth, which one looks brighter in the night sky? Explain why.
Answer:
The blue one.
Explanation:
Im pretty sure its because the blue is hotter.
What would the axes be labelled on a graph that allows you to calculate VELOCITY?
A 5 kg ball is thrown at 4 m/s. What is the ball’s momentum
Answer:
20kgm/s
Explanation:
p=mv
p=5*4
p=20kgm/s
A disk initially rotates counterclockwise at 1.0 rad.S but has a counterclockwise angular acceleration of 0.50rad/s^2 for 2.0s after this acceleration the disk is at an angle of 6.0 what us the disk angular position when the acceleration started
Answer:
Explanation:
initial angular velocity is ω₀ = 1 rad /s
angular acceleration α = - 0.5 rad /s²
time t = 2 s.
Let the initial angular position be θ .
angular displacement = 6 - θ . rad .
angular displacement = ω₀ t - 1/2 α t²
6 - θ = 1 x 2 - 0.5 x 0.5 x 2²
6 - θ = 2 - 0.5 x 0.5 x 2²
= 2 - 1 = 1
θ = 6 - 1 = 5
5 rad is the answer.
What If Earth got Kicked Out of the Solar System?
Answer:
We wouldn't have our moon and sun. The earth will be colder and darker
Explanation:
Answer:
mars will become habitabe
Explanation:
true fact and every planet will become close to sun
Which of the following best describes the formation of surf? Waves energy, rebounding from its impact with shore, crashes into oncoming waves, causing them to break. Entering shallow water forces wave energy upward, making the wave crest unstable and causing it to break. A wave encountering shallow water begins to slow at its bottom, while the top of the wave continues at its previous speed. This causes the wave to break. As waves enter shallow water, the distance between wave crests (wave length) shortens, increasing the tendency to break.
Answer:
The question above would be written again but this time with options attached to it for comprehension sake:
Which of the following best describes the formation of surf?
A. Waves energy, rebounding from its impact with shore, crashes into oncoming waves, causing them to break.
B. Entering shallow water forces wave energy upward, making the wave crest unstable and causing it to break.
C. A wave encountering shallow water begins to slow at its bottom, while the top of the wave continues at its previous speed. This causes the wave to break.
D. As waves enter shallow water, the distance between wave crests (wavelength) shortens, increasing the tendency to break.
The correct answer is option C (A wave encountering shallow water begins to slow at its bottom, while the top of the wave continues at its previous speed. This causes the wave to break).
Explanation:
Surf could mean crashing waves or breaking waves. Generally, the wave speed is constant in the same medium, however, the wave speed decreases as it enters shallow water which is largely due to the water depth which is relatively small, especially when it encounters the bottom of the shallow water. While the top of the wave overtakes the bottom of the wave, making sure the top of the wave continues at its previous speed.
You need to pick up a book off the floor and place it on a tabletop. You expend 1.56J of energy to lift the book with a force of 300N. What is the distance?
Work done = Froce × distance
Now, keeping this formula in mimd, we can find the distance as follows;
= 1.56 = 300 × distance
= 1.56/300 = distance
= 156/30000 = distance
= 0.0052 m = distance
Lets convert it into cm so that you don't get troubled seeing it :)
= 1 m = 100cm
= 0.0052 × 100
= 0.52 cm
the M.E = K.E + P.E. If the M.E of the football is 150 J and when it's thrown the K.E is 70 J. What is the P.E of the football?
Answer:
M.E = K.E +P.E
150=70+P.E
P.E=150 –70
P.E=80J
Please help with this question
Answer:
This unbalanced force causes her to change in direction.
If the forces on an object are unbalanced, this is what happens:
a stationary object starts to move in the direction of the resultant force
a moving object changes speed and/or direction in the direction of the resultant force
[tex]\boxed{\large{\bold{\textbf{\textsf{{\color{blue}{Answer}}}}}}:)}[/tex]
A skier is at the top of the mountain facing east. The skier then decides to skis to the westward side of the mountains and pushes off .The unbalanced for causes her to change in Direction.
Newton discovered
a
that gravity is universal.
b
gravity.
c
that apples hurt when they fall on your head.
d
none of the above
Answer:
b-gravity
Explanation:
newton discovered the general concept of gravity and how it effects earth. he didn't discord it so much as the concept of it.
Newton discovered gravity.
Hope this helps; please mark me brainliest!
Have a wonderful day!
A cyclist is riding his bike up a mountain trail. When he starts up the trail, he is going 8 m/s. As the trail gets steeper, he slows to 3 m/s in 1 minute. What is the cyclist's acceleration?Felipe drives his car at a velocity of 28 m/s. He applies the brake, which slows the vehicle down at a rate of 6.4 m/s2 and causes it to slow to a stop. How long does it take for the car to stop? Round your answer to the nearest tenth.
Answer:
a) a = - 0.0833 m / s², b) t = 4.4 s
Explanation:
a) this is a kinematics exercise where the acceleration is along the inclined plane
v = v₀ - a t
a = v₀ - v / t
a = 3 - 8/60
a = - 0.0833 m / s²
b) in this case the final velocity is zero
v = v₀ - a t
0 = v₀ - at
t = v₀ / a
t = 28 / 6.4
t = 4.375 s
t = 4.4 s
se lanza un cuerpo desde el origen con velocidad horizontal de 40 m/s, y con un ángulo de 60º. calcular la máxima altura y el alcance horizontal.
Answer:
1. [tex]h = 244.8 m[/tex]
2. [tex]x = 564.8 m[/tex]
Explanation:
1. La altura máxima se puede calcular usando la siguiente ecuación:
[tex] v_{f}^{2} = v_{0}^{2} - 2gh [/tex] (1)
Where:
[tex]v_{f_{y}}[/tex]: es la velocidad final = 0 (en la altura máxima)
[tex]v_{0_{y}}[/tex]: es la velocidad inicial horizontal en "y"
g: es la gravedad = 9.81 m/s²
h: es la altura máxima =?
La velocidad incial en "y" se puede calcular de la siguiente manera:
[tex] tan(\theta) = \frac{v_{0_{y}}}{v_{0_{x}}} [/tex]
[tex] v_{0_{y}} = tan(60)*40 m/s = 69.3 m/s [/tex]
Resolviendo la ecuación (1) para "h" tenemos:
[tex]h = \frac{v_{0_{y}}^{2}}{2g} = \frac{(69.3 m/s)^{2}}{2*9.81 m/s^{2}} = 244.8 m[/tex]
2. Para calcular el alcance horizontal podemos usar la ecuación:
[tex]x = v_{x}*t[/tex]
Primero debemos encontrar el tiempo cuando la altura es máxima ([tex]v_{f_{y}}[/tex] = 0).
[tex] v_{f_{y}} = v_{0_{y}} - gt [/tex]
[tex] t = \frac{v_{0_{y}}}{g} = \frac{69.3 m/s}{9.81 m/s^{2}} = 7.06 s [/tex]
Ahora, como el tiempo de subida es el mismo que el tiempo de bajada, el tiempo máximo es:
[tex] t_{m} = 2*7.06 s = 14.12 s [/tex]
Finalmente, el alcance horizontal es:
[tex]x = 40 m/s*14.12 s = 564.8 m[/tex]
Espero que te sea de utilidad!
The frequency of sound is 200 Hz. What does it mean? Please help me
Explanation:
A wave having a frequency of 200 Hz means that 200 such waves pass through a point per second.
Which of the following would be a valid method to increase the buoyant force acting on an object?
Select one:
a. Making the object as wide as possible.
b. Removing material from the object.
c. Making the object's volume as small as possible.
d. Making the object hollow.
what is the difference between mechanical advantage and distance advantage?
CAN ANYONE HELP WITH THESE QUESTIONS :,] PLS IS URGEN IM SO CLOSE TO FAILING ALSO ITS SCIENCE PHYSICS I THINK
SEND ME A MESSAGE
A net force of 60 N north acts on an object with a mass of 30 kg. Use Newton's second law of
motion to calculate the amount of acceleration the object will experience. Then explain how the
amount of acceleration will change if the net force or the mass of the object increases.
Answer:
Explanation:
F = ma. For us, this looks like
60 = 30a and
a = 2 m/s/s
If the force goes up to, say, 90, then
90 = 30a and
a = 3...if the force goes up, the acceleration also goes up.
If the mass goes up to say, 60, and the force stays the same, then
60 = 60a and
a = 1...if the mass goes up, the acceleration goes down.
What is the strength of an electric field 0.2 m from a 1.56 x 10-6 C charge?
Answer:
Solution given:
strength of electric field [E]:?
distance[d]:0.2m
charge[Q]=[tex]1.56×10^{-6} C[/tex]
we have
E =K [tex] \frac{Q}{r²}[/tex]
E=[tex]9×10^{9} C[/tex][tex] \frac{1.56×10^-6 C}{0.2²} [/tex]
E=[tex] 3.51×10^{5}[/tex]V/m
strength of electric field : [tex] 3.51×10^{5}[/tex]V/m
If you shine a light of frequency 375hz on a double slit setup , and you measure the slit separation to be 950 nm and the screen distance to be 4030 nm away , what is the distance from the zero order fringe to the first order fringe ?
Answer:
y = 33.93 10⁵ m
Explanation:
This is an interference exercise, for the contributory interference is described by the expression
d sin θ = m λ
let's use trigonometry for the angle
tan θ = y / L
how the angles are small
tan θ = sin θ / cos tea = sin θ
we substitute
sin θ = y / L
d y / L = m λ
y = m λ L / d
the light fulfills the relation of the waves
c = λ f
λ = c / f
λ = 3 10⁸ /375
λ = 8 10⁵ m
first order m = 1
let's calculate
y = 1 8 10⁵ 4030 10-9 / 950 10-9
y = 33.93 10⁵ m
PLEASE DO THIS SCIENCE QUESTION I WILL MARK YOU THE BRAINLIEST NO LINKS
Answer:
Float
Explanation:
The objects weight 14n and the buoyant force is 12n, so it will sink because the weight is greater than the buoyant force.
Equation: p = m/v
what is negitive acceleration?
According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration.An object with negative acceleration could be speeding up, and an object with positive acceleration could be slowing down.
Answer:
Answer
When decrease in velocity is called negative acceleration
Explanation:
please help!!
A 1.50 V battery has a 32.0 Ohm
resistor attached. How much
current flows through the circuit?
(Unit = A)
Answer:
0.0469
Explanation:
v=1.50
r=32.0
i=?
equation
i=v/r
i=1.50/32.0
i=0.046875
round to 3 sig figs
i=0.0469
Answer:
.0469
Explanation:
acellus
You accidentally slide a glass of iced tea off a table that is 0.75 m tall. How
long does it take the tea to hit the ground?
A. 0.54 s
B. 0.39 s
C. 0.23 s
D. 0.47 s
Answer:
0.39 seconds
Explanation:
Given:
Distance, S = 0.75 m
Acceleration due to gravity, g = 9.81 m/s^2
Initial (vertical) velocity, u = 0 m/s
Final velocity,
S = ut + (1/2)gt^2
0.75 = 0(t) + (1/2)(9.81)t^2
t^2 = 0.75/(9.81/2) = 0.1529 s^2
t = sqrt(0.1529) s.
= 0.391 s.
The time it takes an object to fall a certain distance is 0.39 s. Therefore, option (B) is correct.
What is kinematioc equation?To determine how long it takes for the glass of iced tea to hit the ground, we can use the kinematic equation that relates the distance, time, initial velocity, and acceleration of an object under free fall.
Assuming the glass is dropped from rest, its initial velocity is zero, and the acceleration due to gravity is[tex]-9.8 m/s^2[/tex] (negative because it is acting in the opposite direction to the motion).
Using the equation:
[tex]d = 1/2 * a * t^2[/tex]
where d is the distance, a is the acceleration due to gravity, and t is the time, we can solve for t:
[tex]0.75 m = 1/2 * (-9.8 m/s^2) * t^2[/tex]
Simplifying this equation gives:
[tex]t^2 = 0.75 m / (1/2 * 9.8 m/s^2) = 0.153[/tex]
Taking the square root of both sides gives:
[tex]t = sqrt(0.153) = 0.39 s[/tex]
Therefore, the correct option is B. It takes approximately 0.39 seconds for the glass of iced tea to hit the ground.
Learn more about acceleration, here:
https://brainly.com/question/12550364
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How to find the acceleration?
Answer:
speed/time
Explanation:
Answer:
a= (Vf - Vi)
t
To find acceleration (a) you need to subtract the finale velocity (Vf) minus the initial velocity (vi) divided by time (t) as shown in the equation above.
Describe the movements that occur along each of the three types of faults. Describe the movements that occur along each of the three types of faults.
Answer:
Explanation:
strike-slip, normal and thrust
mark her as brainiest, :) I don't need it :P
A truck covers 40 km with an average speed of 80km/h. Then it travels another 40 km with an average speed of 40 km/h. The average speed of the truck for the total distanced covered is:
Answer:
Average speed = 53.33 km/h
Explanation:
Below is the calculation for the average speed:
Given the average speed of for first 40 km = 80km/h
Time taken to cover the first 40 km = Total Distance / average speed
Time taken to cover the first 40 km = 40 / 80 = 0.5 hours
Given the average speed of for next 40 km = 40km/h
Time taken to cover the next 40 km = Total Distance / average speed
Time taken to cover the next 40 km = 40 / 40 = 1 hours
Now the average speed of the tuck to cover total distance:
Average speed = Total distance / Total time
Average speed = (40 + 40) / (0.5 + 1)
Average speed = 53.33 km/h