Answer:
Warmer temperatures over time are changing weather patterns and disrupting the usual balance of nature. This poses many risks to human beings and all other forms of life on Earth.Changes in temperature cause changes in rainfall. This results in more severe and frequent storms. They cause flooding and landslides, destroying homes and communities, and costing billions of dollars.Water is becoming scarcer in more regions. Droughts can stir destructive sand and dust storms that can move billions of tons of sand across continents. Deserts are expanding, reducing land for growing food. Many people now face the threat of not having enough water on a regular basis.It takes 2.5 minutes for sunlight to reach Mercury. How far is Mercury form the Sun, in meters?
A. 7,200,000,000
B. 110,000,000,000
C. 144,000,000,000
D. 45,000.000.000
E. 3.000,000,000
F. 13,000,000
G. 120.000.000
H. 250,000.000.000
Answer:
Its 57.723 billion meters but D is the closest to that.
A light bulb has a resistance of 360. What is the current in the bulb when it has a potential difference of 120 v across it?.
Answer:
1/3 amp
Explanation:
V = IR
V/R = I
120 / 360 = 1/3 amp
Which of the following
is FALSE about forces?
A. Forces can cause change.
B. Forces act in pairs.
C. Forces cannot be quantified.
Someone claims, based on temperature measurements, that the temperature of a fluid rises during a throttling process in a well-insulated valve with negligible friction. Does this process violate any thermodynamic laws
For someone who claims that based on temperature measurements, the temperature of fluid rises during a throttling process, this assertion is true since no thermodynamic rules are broken.
What is thermodynamics?Generally, Thermodynamics is simply defined as a field of science that is responsible for the relationship between heat and other types of energy.
In conclusion, The temperature of the fluid fluctuates or stays the same during the throttling process.
As a result, this assertion is true since no thermodynamic rules are broken.
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In astronomy, distances are often expressed in light-years. One light-year is the distance traveled by light in one year. If the distance to a star is 3.5 light-years, what is this distance in meters
Answer:
dd=4.3 ly=4.3 •9.46•10°15 m=4.1 10°16m.
Explanation:
A crane lifts a steel grider in 45s.it required the crane to do 8750000 j of work .how much power did the crane use
Answer:
[tex]194.44kw[/tex]
Explanation:
[tex]power = \frac{workdone}{time \: taken} [/tex]
[tex] p = \frac{8750000}{45} [/tex]
[tex]p = 194444.44watt[/tex]
[tex]p = 194.44kw[/tex]
The rate of flow of electric charge along a wire is called.
Current
Hope this helps!
What is equilibrium
pls answer i know but need to confirm
Answer:
a state in which opposing forces or influences are balanced.
Explanation:
Answer: A state of balance between two forces
Explanation: hope this helps!
A ray of light in air strikes the surface of a liquid at an angle of 65 degrees with the normal. The refracted ray is at an angle of 42 degrees with the normal. What is the index of refraction of this liquid?
The index of refraction of this liquid will be 1.28. It is found as the ratio of the sin of the angle of incidence and the angle of reflection.
What is an index of refraction?The refractive index of a substance is a dimensionless quantity that specifies how quickly light passes through it in optics.
The given data in the problem is;
Angle of incidence (i)= 65°
Angle of refraction(r) = 42°
The formula for the index of refraction is;
[tex]\rm n = \frac{sin \ i }{sin \ r} \\\\ \rm n = \frac{sin 65 ^0}{sin 42^0} \\\\ n=1.28[/tex]
Hence, the index of refraction of this liquid will be 1.28.
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4. Surface waves in an earthquake cause damage and destruction by shaking the ground up and down. They are an example of which type of waves:
a. Electromagnetic waves
b. Transverse waves
c. Standing waves
d. Compression waves
Standing waves is the perfect answer for this
A horizontal uniform 1.20-N meter stick is held up by two vertical strings, one at the 20-cm mark and the other at the 60-cm mark. What is the tension in the string at the 60-cm mark
The tension in the string at the 60-cm mark will be 0.9 N.The tension force is applied along the whole length of the wire, pulling energy equally on both ends.
What is tension force?The tension force is described as the force transferred through a rope, string, or wire as it is pulled by opposing forces.
The given data in the problem is;
The length of the stick is, L= 1.20 m =120 cm
T is the tension in the string at the 60-cm mark;
T₁ is the tension at the 20-cm mark
From the torque equilibrium law;
[tex]\rm mg(30)-T_2(40)+T_2 (40) =0 \\\\\ T_1(0)=mg (30)\\\\\ T_2(40)=1.2 (30) \\\\ T_2= 0.9 \ N[/tex]
Hence the tension in the string at the 60-cm mark will be 0.9 N.
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What is the discharge of a stream that is one meter deep, two meters wide, and has a water flow of 5 meters per second
Answer:
10 m^3 /s
Explanation:
1 m X 2 m X 5 m /s = 10 m^3/s
The force of gravity on a 60 kg woman is 588 N. The woman also exerts a gravitational force on
the Earth. How large a force is this?
Answer:
the same 588 N
Explanation:
what is the mass of an object if a force of 2N and gives it an acceleration of 2 m/s2
Answer:
1kg
Explanation:
Use the formula
F=ma
m=F/a
m=2N/2m/s^2
m=1kg
A 38kg child is at the top of a slide that is 2. 1m tall.
(a) If there is no friction, how fast will they be moving when they reach the bottom of the slide?
(b) If they lose 250. 0J of energy to sound, heat, and friction, how fast will they be moving when they reach the bottom?
Answer:
please do not trust those scam links
which statement below can be made about the production of electricity in a nuclear reactor
Answer:
Heat flows from the reactor to the water
Explanation:
Good luck! :)
What is sliding friction?
A. When two solid surfaces slide past one another.
B. When air, water, or oil flow next to a solid.
C. When an object rols across a surface.
D. When objects move through water.
Answer:
I think the answer would be B
Explanation:
Hope this helps:)...if it's wrong I'm sorry for wasting your time and may God bless you:)
What does it mean when di is negative?
Answer:When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. When the image distance is negative, the image is behind the mirror, so the image is virtual and upright.
Explanation:
A conductor differs from an insulator in that a conductor.
Answer:
has free electrons
Explanation:
A conductor has free electrons while an insulator does not. Free electrons are electrons which are not bounded tightly to their parent atoms, and are free to move given the right conditions (ie. a strong EM field).
Hello people ~
A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of the sphere is
(a) 0 V
(b) 10 V
(c) Same as at point 5 cm away from the surface
(d) Same as at point 25 cm away from the surface
Answer:
10V
Explanation:
Hollow sphere means two spherical surfaces inside
So charge on the surface =Charge at any point in sphere i.e voltage remains constant.
So
potential at centre=Potential at surface=10V
Option B is correct
Pls answer need help
Answer:
See below
Explanation:
Find the NET forces on the objects
A 20==>
B 0
C 30==>
D 15==>
So biggest accel = C because it has the most force acting on it
next is A because it has the next biggest force
next is D then B ...B has no net force acting on it
Your favorite radio station broadcasts at a frequency of 83.8 MHz with a power of 16.5 kW. How many photons does the antenna of the station emit in each second
For a radio station broadcasts at a frequency of 83.8 MHz with a power of 16.5 kW, the number of photons is mathematically given as
P=6.92*10^{29}photon/sec
What is the number of photons does the antenna of the station emit in each second?Generally, the equation for the energy is mathematically given as
E=hf
Therefore
E=6.63*10^{34}*83*10^6
E=5.561*10^26J
In conclusion, the number of photons
P=dN/dt
P=38500/5.561*10^{26}
P=6.92*10^{29}photon/sec
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What is the relative motion if there were two marbles traveling next to each other at different speeds?
Answer:
v1-v2 is motion of m2 relative to m1 v2-v1 is motion of m1 relative to m2
Explanation:
Describe what voltage is
Answer:
electrical 'pressure' measurement
Explanation:
An ideal gas, initially at a volume of 2.33333 L
and pressure of 9 kPa, undergoes isothermal
expansion until its volume is 7 L and its pressure is 3 kPa.
Calculate the work done by the gas during
this process.
Answer in units of J.
(part 2 of 2)
Find the heat added to the gas during this
process.
Answer in units of J.
The work done by a gas during an isothermal process is equal to -23.079 Joules.
How to calculate the work done by the gas.Mathematically, the work done by a gas during an isothermal process is given by this formula:
W = nRTln(P₂/P₁)
Where:
P is the pressure.R is the ideal gas constant.T is the temperature.n is the number of moles.Given the following data:
Initial volume = 2.33333 L to m³ = 0.00233333 m³.
Initial pressure = 9 kPa.
Final volume = 7 L to m³ = 7000 m³.
Final pressure = 3 kPa.
Next, we would determine the temperature of this gas by using the ideal gas equation:
T = PV/R
T = (9000 × 0.00233333)/8.314
T = 2.526 K.
Now, we can calculate the work done by this gas:
W = nRTln(P₂/P₁)
W = 1 × 8.314 × 2.526 ln(3000/9000)
W= 21 × ln(0.3333)
W = 21 × (-1.099)
W = -23.079 Joules.
How to calculate the amount of heat added.From the first law of thermdynamics, the amount of heat added to the gas during this isothermal process is given by:
Q = -W
Q = -(-23.079)
Q = 23.079 Joules.
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A 22 ohm resistor and a 33 ohm resistor are connected in series and placed across a 120-v potential differance
a. What is the equivalent resistance of the circuit?
b. What is the current in the circuit?
c what is the voltage drop across each resistor?
d what is the voltage drop across the two resistors together?
Answer:
Explanation:
Part A
Resistances in Series Add
Rt = R1 + R2
Rt = 33 + 22
Rt = 55 ohms
Part B
Current is found by using ohms law
I = E/R
E = 120 volts
R = 55 ohms
I = 120/55
I = 2.18
Part C
a)E = I * R
E = ?
I = 2.18
R = 22 ohms
E = I * R
E = 2.18 * 22
E = 48 volts when I is not rounded in Part B
b)E = I * R
E = ?
I = 2.1818...
R = 33
E = 2.181818... * 33
E = 72 when the repeating decimal is allowed to repeat.
Part D
The total voltage drop across both resistors adds
E = 72 + 48
E = 120 Volts
a graph for horizontal position vs gravitational potential energy represents which of the following
(a) represent the slope of a track
(b) represent opposite of slope of track
(c) a linear relationship
Answer:
this may not be what you're looking for but here you go
Explanation:
A horizontal line means the object is not changing its position - it is not moving, it is at rest. A downward sloping line means the object is returning to the start. Speed-Time graphs are also called Velocity Time graphs. Speed-Time graphs look much like Distance-Time graphs.
Which is produced around a wire when an electrical current is in the wire?
A.magnetic field
B.solenoid
C.electron flow
D.electromagnet
Answer:
it is a magnetic field
Explanation:
A sphere of metal has a mass of 1431 g and a diameter of 5.80 cm. What is the density of metal in g/cm3
Answer:
see below
Explanation:
You will need t find the volume of the sphere
4/3 pi r^3 divide into the mass
1431 / (4/3 pi (5.8)^3) = 14 gm /cm^3
What is the fundamental frequency of a
guitar string when the speed of waves on
the string is 115 m/s and the effective string
length is 0.720 m?
Answer quickly if possible
Answer:
dk
Explanation:
sorry jus rlly not that smart