Answer:
Helped pin down the age for the universe now known to be 13.8 billion years, roughly three times the age of Earth. Discovered two moons of Pluto, Nix and Hydra. Helped determine the rate at which the universe is expanding. Discovered that nearly every major galaxy is anchored by a black hole at the centre.
Explanation:
Cellular respiration transforms oxygen and sugars into carbon dioxide and water. Which of the following best explains this reaction?
A Physical change, only phases of matter changed
B Chemical change, new substances were formed
C Physical change, solids were changed into gases
D Mixtures and solutions were formed from the materials
A microwave oven has a power of 1800 W and the potential difference applied from the mains is 230 V. What are its current and resistance?
Answer:
I = 7.826A
R = 29.38 Ω
Explanation:
First, let us find the current of the microwave.
Let us use the below formula for that.
Power = Voltage × Current
Current = Power ÷ Voltage
= 1800w ÷ 230v
= 7.826 A
And now let us find the resistance using the below formula.
Voltage = Current × Resistance
Resistance = Voltage ÷ Current
= 230V ÷ 7.826A
= 29.38 Ω
The figure shows an overhead view of a 2.10 kg plastic rod of length 1.20 m on a table. One end of the rod is attached to the table, and the rod is free to pivot about this point without friction. A disk of mass 55.0 g slides toward the opposite end of the rod with an initial velocity of 26.5 m/s. The disk strikes the rod and sticks to it. After the collision, the rod rotates about the pivot point.
(a)What is the angular velocity, in rad/s, of the two after the collision?
(b)What is the kinetic energy, in joules, before and after the collision?
KEi
=
J
KEf
=
J
(a) The angular velocity of the system after the collision is 1.61 rad/s.
(b) The kinetic energy before collision is 19.31 J and the kinetic energy after collision is 1.45 J.
Conservation of angular momentumThe angular velocity of the system is determined by applying the principle of conservation of angular momentum.
Li = Lf
P x r = Ifωf
mv x r = Ifωf
[tex]\omega _f = \frac{mvr}{I_f} \\\\\omega _f = \frac{mvr}{\frac{1}{3}Mr^2 + mr^2 } \\\\\omega _f = \frac{mvr}{r^2(\frac{1}{3}M + m )}\\\\\omega _f = \frac{mv}{r(\frac{1}{3}M + m )}\\\\\omega _f = \frac{0.055 \times 26.5}{1.2(\frac{2.1}{3} \+ \ 0.055)} \\\\\omega_f = 1.61 \ rad/s[/tex]
Kinetic energy before the collisionKinetic energy before the collision is calculated as follows;
[tex]K.E_i = K.E_{ball} + K.E _{rod}\\\\K.E_i = K.E_{ball} + 0\\\\K.E_i = \frac{1}{2} \times m \times v^2\\\\K.E_i = \frac{1}{2} \times 0.055 \times 26.5^2\\\\K.E_i = 19.31 \ J[/tex]
Kinetic energy after the collisionThe kinetic energy after the collision is calculated as follows;
[tex]K.E_f =\frac{1}{2} I_f \omega_ f^2\\\\K.E_f = \frac{1}{2} (\frac{1}{3}Mr^2 + mr^2)\omega _f^2\\\\K.E_f =\frac{1}{2} [\frac{1}{3}(2.1)(1.2)^2 + (0.055)(1.2)^2]\times (1.61)^2\\\\K.E_f = \frac{1}{2} (1.008 + 0.114) \times (1.61)^2\\\\K.E_f = 1.45 \ J[/tex]
Learn more about rotational kinetic energy here: https://brainly.com/question/25803184
Which planet moves the fastest and which planet moves slowest?
Answer:
d is the fastest and c is the slowest
Explanation:
physics
Answer:
Neptune will move the fastest
Mercury will move the slowest
Explanation: Because what ever is closer to a object will move the slowest and something further away will have to go faster to keep up with the object that is closer.
Nima explains that visible light occupies the range of the electromagnetic spectrum that humans can see. What other characteristics of visible light can Nima share with her students
Other characteristics that Nima can share with her students are as follows:
Visible light ranges in wavelength of 400 - 700nmVisible light is between the ultraviolet and infrared rays of the EM spectrum. What is visible light?Visible light is one of the components of the electromagnetic spectrum (EM). It is the only part of the EM spectrum that is visible to human eyes.
According to this question, Nima has already shared this characteristics of visible light with her student.
Other characteristics that Nima can share with her students are as follows:
Visible light ranges in wavelength of 400 - 700nmVisible light is between the ultraviolet and infrared rays of the EM spectrum.Learn more about visible light at: https://brainly.com/question/7071188
I need help with this will give brainly.
Remote-controlled planes may take over most hurricane-hunting missions
A. Vivid Language
B. Objective Language
Answer:
gogo
Explanation:
The right-hand rule applies to what kind of charge?.
Which property describes the temperature at which a liquid changes to a gas?
Group of answer choices
freezing point
boiling point
melting point
condensation point
Answer:
Boiling Point
Explanation:
When a liquid changes to a gas is called the boiling point.
how is the rotation of the sun, different from the rotation of the earth
Answer:
The Sun has a north and south pole, just as the Earth does, and rotates on its axis. However, unlike Earth which rotates at all latitudes every 24 hours, the Sun rotates every 25 days at the equator and takes progressively longer to rotate at higher latitudes, up to 35 days at the poles. This is known as differential rotation.
Explanation:
HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
How old is the sun?
Answer:
4.6 billion years
Explanation:
The weather in Detroit will likely be rainy because Mike noticed a(n) _________ near Detroit.
Question options:
occluded front
stationary front
cold front
warm front
Answer: stationary front
Explanation:
Analyze Ultrasound uses high-frequency
sound waves to get images of the insides of
our bodies. Sound waves would travel the
fastest through which of the materials listed
in the chart?
Answer:
we have sung a song .change into simple present tense
A 30.6 kilogram object is pulled by a horizontal force of 243 newtons causing it to accelerate at 5 meters per second squared. What is the force of friction acting on the
object? Calculate the coefficient of friction of the two surfaces.
Answer:
Ffriction = 90 N
coefficient = 0.3
Explanation:
First, note that the sum of all the forces in the x directions equals the mass multiplied by the acceleration in the x direction.
assuming the direction of the pulling force is positive,
243 N - Ffriction = m * a
m= 30.6 kg
a= 5 m/s/s
Ffriction= 243 - m*a
Ffriction= 243 - (30.6)(5)
Ffriction=90 N
The force of friction is equal to the coefficient of friction multiplied by the normal force on the object. Because the pulling force is completely horizontal, the normal force of the object is equal to its weight, which is m * g, or (30.6 kg)(9.8 m/s/s) = 299.88 N
Ffriction = coefficient * Fnormal
90 = coefficient * 299.88
coefficient = 0.3
What does high resistance mean?
A. Electrons are squeezed together, creating friction as
they flow.
B. Electrons flow through a wire without touching each
other.
C. Electrons have an easy time completing the circuit.
D. Electrons flow backwards through the circuit.
Answer:
i think it's A
because if there is more friction then it will create more hindrance for the current to flow which is ultimately called resistance .
Please help me answer this science question.
A.) 1
B.) 2
C.) 3
D.) 4
Thank you!
Grade: 6/middle school
Subject: Science
Which of the following people came up with the term “hypnosis”?
Answer:
A- James Braid
Explanation:
e2020
How long does it take for uranus to rotate on its axis.
Answer: 17 hours
Explanation:
Which of the following determine the chemical properties of an element?
A)Its protons
B)Its inner shell electrons
C)The size of its nucleus
D)Its valence electrons
Answer:
D, valence electrons.
Explanation:
Since the number of shells are dependent on the number of valence electrons, which determines the period of the element. Because each shell of an element holds a total of 8 valence electrons, there is a chemical association that is being made between the outer electrons and the atom.
Answer:
The correct answer is D. Its valence electrons.
Explanation:
The valence electrons are those that participate in reactions with other elements. The fewer valence electrons that an element has, the less stable it becomes; an element with a full valence electron shell does not frequently interact with other elements. In this way, the valence electrons determine the chemical properties of an element.
Hope this helps!
A boy weighing 50 kg is running at 2m/s. What is its kinetic energy? *
10 points
Identify the functions of Respiratory and Circulatory Systems page 134
PLEASE HELP, IS URGENT
Answer: around 65.
Explanation:
You are given a diameter of 10 cm (this is x value). find what y value is equal to at those 10 cm. You’ll see that it’s aroun 65
A projectile is launched straight up. From launch to landing back down takes 8s.
What is its launch velocity?
how much time does it required for an airplane to reach its take off speed of 77 m/s if it starts from rest and its average acceleration is 8.2 m/s^2
Answer:
t = 9.38 seconds
Explanation:
Given that,
Initial speed of the airplane, u = 0 (at rest)
Final speed of the airplane, v = 77 m/s
Acceleration of the airplane, a = 8.2 m/s²
We need to find the time required for the airplane to accelerate. The formula of acceleration is given by :
[tex]a=\dfrac{v-u}{t}\\\\t=\dfrac{v-u}{a}\\\\t=\dfrac{77-0}{8.2}\\\\t=9.38\ s[/tex]
So, the time taken by the airplane is 9.38 seconds.
If the Voltage is increased Current decrease what happens to the resistance
An object is in simple harmonic motion. of the following quantities related to the object, which set of three can have maximum magnitudes at the same instant of time?.
The amplitude, restoring force and speed of an object undergoing simple harmonic motion may have maximum magnitudes at the same instant of time.
What is simple harmonic motion?Simple harmonic motion is a regular repeating motion. The acceleration of a simple harmonic motion is always directed towards the center of the motion.
There are three quantities related to the object that can have maximum values at the same time and these are;
AmplitudeRestoring forceSpeedLearn more about simple harmonic motion:https://brainly.com/question/17315536
In a model AC generator, a 502 turn rectangular coil 8.0 cm by 23 cm rotates at 120 rev/min in a uniform magnetic field of 0.61 T. (a) What is the maximum emf induced in the coil
Answer:
9896
Explanation:
multiply them all together
applied a force of 55 N to accelerate a 10 kg box at 3 m/s2 along a horizontal surface. What is the magnitude of the frictional force?
Answer:
25N
Explanation:
if you calculate it right the answer will be 25
What are some common positive and negative attitudes toward physical activities? What
is your personal attitude toward exercise and physical activity? What three emotions do
you immediately feel when you think about your health and fitness? What is the
relationship between physical fitness and health? How does physical fitness affect your
personal health?
Which car part tells the velocity of a car at a given time?
A. Odometer
C. Accelerator
B. Speedometer
D. Fuel gauge
Answer:
Speedometer. It's in the name.
What is the best inference for the height of the plant after 35 hours?
Option D, 1.95 cm
1.8+2.1=3.9/2 = 1.95