Answer:
A light-year is the distance light travels in one year. How far is that? Multiply the number of seconds in one year by the number of miles or kilometers that light travels in one second, and there you have it: one light-year. It's about 5.88 trillion miles (9.5 trillion km).
Explanation:
A girl pushes her little brother on his sled with a force of 200. N for 850. m. How much work is this iſ the fored
of friction acting on the sled is (a) 200. N. (b) 300. N?
Explanation:
Given that,
A girl pushes her little brother on his sled with a force of 200. N for 850. m
We need to find the work done by the force of friction acting on the sled. The force of friction is 200 N
Net force = 200 N - 200 N = 0
Work done = 0
If force of friction is 300 N.
Net force = 300 N - 200 N = 100 N
The work done by a force is given by :
W = Fd
Put values,
W = 100 × 850
W = 85000 J
Hence, this is the required solution.
Water rockets are very different from fuel powered rockets for many reasons. Explain some of the differences between them and why rockets that are launched into space require more power and thrust that water rockets?
Answer:
How is a water rocket different than a compressed air rocket?
Usually the rocket is made from a 2-liter soda pop bottle. Before launch, the bottle is filled with some amount of water, which acts as the "propellant" for the launch. Since water is about 100 times heavier than air, the expelled water produces more thrust than compressed air alone.
A very long cylindrical shell made of copper has an inner radius 2 cm and an outer radius of 3 cm. This shell concentrically surrounds a very long charged aluminum rod of radius 1 cm with a charge density of 4 pC/m. All charges on the aluminum rod reside at its surface. The inner surface of the copper shell has exactly opposite charge to that of the aluminum rod while the outer surface of the copper shell has the same charge as the aluminum rod. Find the magnitude and direction of the electric field at points that are at the following distances from the center of the aluminum rod:
Question:
Find the magnitude and direction of the electric field at points that are at the following distances from the center of the aluminum rod:
(a) 0.5 cm, (b) 1.5 cm, (c) 2.5 cm, (d) 3.5 cm, (e) 7.0 cm
Answer:
(a) 0
(b) 4.795 N/C
(c) 2.877 N/C
(d) 2.055 N/C
(e) 1.027 N/C
Explanation:
The given parameters are;
The inner radius of the copper = 2 cm
The outer radius of the copper - 3 cm
The radius of the aluminum rod, r = 1 cm
The radius of the aluminum rod = 4 pC/m
a) The charge at the 0.5 cm from the center of the aluminum rod, E = 0
There is no charge inside the rod given that the aluminum road is a conductor of electricity, having all the charge on its surface
b) At 1.5 cm, we have;
[tex]E = \dfrac{2 \cdot \lambda}{4 \cdot \pi \cdot r \cdot \epsilon_0}[/tex]
Where;
[tex]\dfrac{ \lambda}{4 \cdot \pi \cdot \epsilon_0} = 8.99 \times 10^9 \times 4 \times 10^{-12}[/tex]
r = 1.5 cm = 0.015 m
∴ E = (2 × 8.99 × 10⁹ × 4 × 10⁻¹²)/0.015 ≈ 4.795
The magnitude of the electric field, E = 4.795 N/C
The direction of the charge depends on the charge sign on the rod
c) At 2.5 cm, we have;
r = 2.5 cm = 0.025 m
E = (2 × 8.99 × 10⁹ × 4 × 10⁻¹²)/0.025 ≈ 2.877
The magnitude of the electric field, E ≈ 2.877 N/C
d) At r = 3.5 cm, we have;
r = 3.5 cm = 0.035 m
E = (2 × 8.99 × 10⁹ × 4 × 10⁻¹²)/0.035 ≈ 2.055
The magnitude of the electric field, E ≈ 2.055 N/C
e) At
r = 7.0 cm = 0.070 m
E = (2 × 8.99 × 10⁹ × 4 × 10⁻¹²)/0.07 ≈ 1.027
The magnitude of the electric field, E ≈ 1.027 N/C
What helps night vision? Answer fast please.
Answer:
Halos, blurriness, and night blindness causes night vision (symptoms) while vitamin-A,corrective lenses, such as eyeglasses or contacts, can improve or help night vision.
Explanation:
I bet you will get full Marks if you write it!!
(please note that you will have to mark me as brainliest if it helped you)£
want brainlyist whats number am i thinking of from 1 to 100
Answer:
50 out of 100 (ik its right)
Answer:
57? 17? 7? 77? 37? 47? 87? 97? 27? 67?
Explanation:
id'k
Which is the correct Lewis structure for ethylene, CHA?
H
H
H H
1
CEC
1 1
H
H
C
C:
H
A.
H
B.
H
н
H
1
С
с
C.
С
1
н
H
H
C.
H
D
•HlclH|
H
I-Ö-I
E
ΟΑ. Α A
OB.
B
Ос. с
ODD
ОЕ Е E
Answer:
:c: H* : A: :C: H* :A: :C: H* :A:
What is rising temperatures
Answer:
i don't know but have a good day
Give details of aids in brief and explain how to protect yourself and prevent.
Answer:
(AIDS) is a chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV). By damaging your immune system, HIV interferes with your body's ability to fight infection and disease. HIV is a sexually transmitted infection (STI). It can also be spread by contact with infected blood or from mother to child during pregnancy, childbirth or breast-feeding.
Explanation:
To help prevent the spread of HIV: 1. Use treatment as prevention (TasP). If you're living with HIV, taking HIV medication can keep your partner from becoming infected with the virus.
draw a model diagram to represent water
Answer:
hope this will help
please give brainliest if correct
The game of floor hockey is primarily a blank
and blank
game.
Answer:
Fast and Energetic
Explanation:
The game of floor hockey is primarily a Fast and Energetic game. The main objective of the game of field hockey is to score more goals than the opposing team by shooting the Hockey ball into the goal post of the opposing team, Field hockey is similar to Ice hockey but the major difference is that Filed hockey is played without skates
A Carnot engine uses a steam boiler at 100°C as the high-temperature reservoir. The low-temperature reservoir is the outside environment at 35.0°C. Energy is exhausted to the low-temperature reservoir at a rate of 150 W. Hint (a) Determine the efficiency of the engine. (Give your answer as a percentage.) eC = % (b) Determine the useful power output of the heat engine (in W). output = W (c) How much steam (in kg) will it cause to condense in the high-temperature reservoir in 2.00 h? condensate = kg
Answer:
(a) η = 0.1742 = 17.42 %
(b) W = 31.64 W
(c) m = 0.58 kg
Explanation:
(a)
The efficiency of a Carnot's engine is given as follows:
[tex]\eta = 1-\frac{T_2}{T_1}[/tex]
where,
η = efficiency = ?
T₁ = source temperature = 100°C + 273 = 373 K
T₂ = sink temperature = 35°C + 273 = 308 K
Therefore,
[tex]\eta = 1 - \frac{308\ k}{373\ k} \\[/tex]
η = 0.1742 = 17.42 %
(b)
Another formula for the efficiency of Carnot's Engine is:
[tex]\eta = 1 - \frac{Q_2}{Q_1}[/tex]
where,
Q₁ = Input heat rate
Q₂ = Heat rejected = 150 W
Therefore,
[tex]0.1742 = 1 - \frac{150\ W}{Q_1}\\\\ \frac{150\ W}{Q_1} = 1-0.1742\\\\Q_1 = \frac{150\ W}{0.8258}[/tex]
Q₁ = 181.64 W
Now, for the useful power output:
[tex]W = Q_1-Q_2\\W = 181.64\ W - 150\ W\\W = 31.64\ W[/tex]
where,
W = Useful Output
W = 31.64 W
(c)
The heat required to condense steam i given as:
[tex]Q = mH\\Q_1t=mH\\m = \frac{Q_1t}{H}[/tex]
where,
m = mass of steam condensed = ?
t = time = 2 h = 7200 s
H = Latent heat of condensation of steam = 2260 KJ/kg = 2260000 J/kg
Therefore,
[tex]m = \frac{(181.64\ W)(7200\ s)}{(2260000\ J/kg)}[/tex]
m = 0.58 kg
Speed of light in a medium with n > 1
is the same as in free space
is greater than in free space
is less than in free space
depends on the transparency of the medium
Answer:
C
Explanation:
Without thinking, the answer is C.
The problem is with D. Of course it is going to depend on the transparency. If the material is a rock, then the light won't go through, and n >>>1. I don't think you are intended to think that way, but I sure wish D wasn't there. I'd answer C, but be prepared to see it come out as D.
Answer:
it and i quote you "is less than in free space
Explanation:
i cant explain
Which wave is carrying the most energy?
Find the gravitational force that Earth (mass = 5.97 × 10²⁴ kg) exerts on the moon (mass = 7.35 × 10²² kg) when the distance between them is 3.84 × 10⁸ m. The value of G is 6.67 x 10⁻¹¹ Nm²/kg².
Explanation:
mass of earth (m1)=5.97×10^24
mass of moon (m2)=7.35×10^22
distance between their center (d)= 3.84×10^8
G=6.67×10^-11
now,
gravitational force =(F)= G(m1×m2)/d²
6.67×10^-11(5.97×10^24×7.35×10^22)/(3.84×10^8)19.84×10^19stay safe healthy and happy...At the end of 3N force acts on the object during time interval of 1.5seconds with force acting towards right. A constant force of 4N to left is applied for 3seconds. What is the velocity at the end of the 3seconds ?
Answer:
v_f = -7.5 m / s
Explanation:
Let's analyze this exercise a little, two forces that act on a body for different time intervals are indicated, each force creates an impulse and since this is a vector quantity we must add in the form of vectors. The net momentum is
we assume that the direction to the right is positive
I = I₁ + I₂
I = F₁ Δt₁ - F₂ Δt₂
I = 3 1.5 - 4 3
I = -7.5 N s
now let's use the relationship between momentum and momentum, suppose the object starts from rest (vo = 0)
I = Δp
I = m (v_f - v₀)
v_f = I / m
v_f = -7.5 / m
to finish the calculation we must assume a mass m = 1 kg
v_f = -7.5 m / s
the negative sign in the body is moving to the left
If you decide you want to meet someone you met online, what should you do first?
A. Tell your best friend.
B. Call the person you met online on the phone.
C. Tell your parents
D. Set up a meeting place.
c tell your parents it could be someone very dangerous and meeting people online can be very risky I would also tell my bsf just for fun tho
Continental Drift Research HW(12 Sentences)
Answer:
Here it is lol
Explanation:
Continental drift is the hypothesis that the Earth's continents have moved over geologic time relative to each other, thus appearing to have 'drifted' across the ocean bed. The theory of continental drift is most associated with the scientist Alfred Wegener. In the early 20th century, Wegener published a paper explaining his assumption that the continental landmasses were drifting across the planet, sometimes plowing through oceans and into each other. He called this movement Continental drift. Many people did not believe the theory and he received criticism for it because it was incomplete and flawed, and he could not fully explain what drove the continental drift to occur. You can best see this in the quote by Geologist R. Thomas Chamberlain. “If we are to believe in Wegener’s hypothesis we must forget everything which has been learned in the past 70 years and start all over again.”The idea of Continental drift includes the theory of plate tectonics, which explains the cause of the continents drifting. The earth’s outer shell composed of plates moves a little bit every year. The heat coming from the interior of the earth triggers this movement to occur through convection currents inside the mantle. And that all of the Earth's continents were once part of an enormous, single landmass called Pangaea.
As part of his hypothesis of a mega continent, he discovered research papers on fossils supporting his theory that Africa and South America had once been connected. These studies indicated evidence of fossils of identical land animals that had lived in both areas simultaneously hundreds of millions of years ago. One fossilized land organism that added credibility to Wegener’s theory was that of the Mesosaurus, a small, freshwater aquatic reptile from the Permian period about 260 million years ago in what is now Easternsouth America and Southwestern Africa. Wegener asserted that South America and Africa must have been joined during that period of history because fossils of Mesosaurus are limited to those regions, and if Mesosaurus had been able to make the long journey across the South Atlantic, its fossils would likely be more widely distributed.
que es el periodo de un pendulo
Answer:
what
Explanation:
Answer:
El periodo del péndulo simple, para oscilaciones de poca amplitud, viene determinado por la longitud del mismo y la gravedad.
Explanation:
No influye la masa del cuerpo que oscila ni la amplitud de la oscilación. Donde: T: Periodo del péndulo.
The atomic number is equal to the number of _________ in the atom.
Question 8 options:
protons
protons and neutrons
neutrons
protons, neutrons, and electrons
Answer:
Proton
Explanation:
Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.
~Chapter Name: Heats and its effects ~
(Collecting Information)
how does a veterinary doctor (a doctor who treats animals) find out the body temperature of domestic animals or birds?
Go to the nearest veterinary clinic and find out
(I don't have a clinic near it miles away so pls help)
Answer:
Either orally or rectally
Explanation:
(I didn't visit the vet clinic, I just searched it up)
It depends on the animal. You can't check a birds temperature with a thermometer because it will rupture its cloaca gland but you can check its poop.
Answer:
thermometer is used by veterinary doctors to find out the temperature of domestic animals .
A marble is dropped into a graduated cylinder that is filled with water. Use the words
from the word bank to describe the speed and forces. Words may be used more than
once.
Point A: Speed
force
A
Point B: Speed
force
ml
Point C: Speed
force
30
B
20
is constant
increases
decreases
balanced
unbalanced
C
Answer:
v_t = [tex]\frac{2 g \ ( \rho_b - \rho_l ) r^2 }{9 \ \eta }[/tex]
Explanation:
Let's describe the motion and forces on the marble when it falls into the graduated cylinder filled with water.
Initially, the marble in the air falls under the influence of its weight (gravity force), when it enters the water, a friction force appears that INCREASES with SPEED and opposes the movement, this force is called Stokes force.
Fr = 6π R η v
where η is the viscosity of water
also because of this in a liquid it has an upward thrust, given by Archimedes' law, this thrust is CONSTANT
B = ρ_l g V_l
in that case the volume of liquid(V_l) is equal to the volume of the marble.
Constant force of gravity
W = mg
using the concept of density
ρ_body = m / V
W = ρ_body g V_body
we apply Newton's second law
Fr + B - W = ma
the friction force increases and the other two are constant, so acceleration decreases until reaching zero, at this point the forces are in BALANCE
Fr + B - W = 0
and the speed remains constant, being called TERMINAL SPEED
v_t = [tex]\frac{2 g \ ( \rho_b - \rho_l ) r^2 }{9 \ \eta }[/tex]
from this point on, the displacement is proportional to the time
I NEED THIS ASAP I WILL MARK YOU THE BRAINLIEST NO LINKS !!!!
Newton's First Law state
For every action there is an equal and opposite reaction.
An object in motion stays in motion unless acted upon by an unbalanced force.
Gravity acts on all objects that have mass.
Force= mass x acceleration
A sled drops 50 meters in height on a hill. The mass of the rider and sled is 70 kg and the sled is going 10 m/s at the bottom of the hill. What is the efficiency of energy conversion from potential to kinetic?
Answer:
Efficiency = 10.2 %
Explanation:
Given the following data;
Mass = 70 kg
Height = 50 m
Velocity = 10 m/s
We know that acceleration due to gravity is equal to 9.8 m/s².
To find the efficiency of energy conversion from potential to kinetic;
First of all, we would determine the potential energy;
P.E = mgh
P.E = 70 * 9.8 * 50
P.E = 34300 J
For the kinetic energy;
K.E = ½mv²
K.E = ½ * 70 * 10²
K.E = 35 * 100
K.E = 3500
Therefore, Input energy, I = 34300 J
Output energy, O = 3500 J
Next, we find the efficiency;
Efficiency = O/I * 100
Substituting into the formula, we have;
Efficiency = 3500/34300 * 100
Efficiency = 0.1020 * 100
Efficiency = 10.2 %
True or false?
________________ Mid-ocean ridges are sites where old crust sinks into the asthenosphere.
Answer:
true Mid-ocean ridges are sites where old crust sinks into the asthenosphere.
Explanation:
hope it helps
how is the internal energy of the particles in the brake pads affected by the increase in temperature?
Answer:
increasedExplanation:As the temperature is increased the more the energy store
What is meant by a quark’s “flavor”?
a the type of quark
b the color charge of the quark
c the size of the quark
d how a quark tastes
Answer:
b
Explanation:
because a quark have many kinds of flavor
Answer:
[tex]\Large \text{A}[/tex]
Explanation:
Flavor is the name given by scientists which refers to the type of quark.
What is the frequency of light with a wavelength of 7.9 x 10^-9 m? ( the speed of light is 3.00 x 10^8)
A.) 3.80 x 10^16
B.) 2.37 Hz
C.) 2.37 m
D.) 3.80 x 10^16 Hz
B 0.25 m A stone weighing 0.7 kilograms rolls down the inclined plane from position B to position A. Position A is located at sea level. The difference in the gravitational potential energy of the ball between positions A and B is about 9.8 N/kg. ) joules. (Use PE= mxgx h, where g
Answer:
-1.715J
Explanation:
B: (9.8)(0.7kg)(0.25m)=1.715J
A: (9.8)(0.7kg)(0)=0J
What device is like the reverse of an electric motor?
a.
Generator
c.
Steam engine
b.
Tesla coil
d.
Battery
Answer:
a. Generator
Explanation:
Answer:
A
Explanation:
A battery derives its energy chemically. D is not the answer.
C develops its energy by burning fuel and transferring the heat energy to make water into steam which is chemical/mechanical. Not C
B A Tesla Coil produces a very high voltage and a low current. Not B.
The answer left is A. It converts mechanical energy into electrical energy. It is the only device listed that does this.
9. What strategies can be used to ensure that the forests are a continued
source of resources? [5]
Help me pls I’m giving brainlest and 10 points plssss
Answer:
Strategies to ensure that - forests are continued source of resources.
Explanation:
Forests continued sustainable use, ie today's use without compromising with tomorrow's needs - can be done using following strategies
By protection against Environment Degradation phenomenas - Soil Erosion (Erosion of top most fertile layer of soil), Land Degradation (Land losing its essential valuable nutrients) By ensuring that rate of extraction of forest resources is less than their replenishment rate, & our waste generation into forests is less than their absorptive capacity.