Answer:
60Nm
Explanation:
Work done = F * S = 12*10*0.5 = 60Nm
A pulley system is used to lift an object. Which factor could affect the efficiency of the system? (1 point)
O the mass of the person pulling
O the distance the weight is lifted
O the friction of the individual pulleys
O the mass of the object
Answer:
the distance the weight is lifted
Explanation:
How far away is the closest star?
Answer: Proxima Centauri is the closet star about 40,208,000,000,000 km away.
Explanation:
Answer:
The closest star is about 25,300,000,000,000 miles (39,900,000,000,000 kilometers) away
Explanation:
NEED HELP ASAP PLEASE!
The primary coil of a transformer has 1,000 turns of wire, and its secondary coil has 2,000 turns of wire. The input voltage is 140 V. What is the output voltage of the transformer?
Answer:
Here is the solution hope it helps:)
Answer:
280v
Explanation:
Why are we unlikely to find earth-like planets around halo stars in the galaxy?.
The galaxy comprises of various stars. We are unlikely to find earth-like planets around halo stars in the galaxy because Halo stars need few heavy elements to create rocky planets.
What is galaxy?A galaxy is a massive cluster of stars held together by t he effect of gravity.
Halo stars formed in an environment where there were few heavy elements to create rocky planets.
Thus, we are unlikely to find earth-like planets around halo stars in the galaxy because Halo stars need few heavy elements to create rocky planets.
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Two beams of coherent light are shining on the same piece of white paper. with respect to the crests and troughs of such waves, darkness will occur on the paper where
Answer:
"where crests and troughs have their maxima at the same time"
Crests and troughs are 180 deg out of phase and when they have their maxima at the same time and place, their net contribution will be zero"
Find the magnitude and direction of
the net force being acted on the
free body diagram below.(look at the picture I provided)
Explanation:
Pick your direction of the perpendicular forces.
Let down be negative and up be positive.
Remember that sum of all the forces is the net force,
So for the vertical forces, we have
[tex]45 + ( - 45) = 0[/tex]
Next, pick your direction of the parallel forces.
Let right be positive and left be negative so we have
[tex]15 + ( - 45) = - 30[/tex]
So our net force is 30 N to the left
A tube is open only at one end. A certain harmonic produced by the tube has a frequency of 475 hz. The next higher harmonic has a frequency of 1425 hz. The speed of sound in air is 343 m/s
The formula for the fundamental frequency for an open tube at one end is : F = nV/4L the integer n = 3 which describe the frequency 450 hertz and length of tube L = 0.6m approximately
What is frequency?Frequency of the object is defined as the number of cycles attend in a second .
Given that a tube is open only at one end. And a certain harmonic produced by the tube has a frequency of 450 Hz. The next higher harmonic has a frequency of 750 Hz. The formula for the fundamental frequency for an open tube at one end is :
[tex]F = \dfrac{V}{4L}[/tex]
That is, 1st harmonic
[tex]\dfrac{V}{4L} = F[/tex]
2nd harmonic =
[tex]\dfrac{3V}{4L} = 3F[/tex]
3rd harmonic =
[tex]\dfrac{5V}{4L} = 5F[/tex]
The general formula can therefore be [tex]F =\dfrac{ nV}{4L}[/tex]
For the first harmonic in the question,
[tex]450 = \dfrac{343n}{4L}[/tex]
make 4L the subject of the formula
[tex]4L = \dfrac{343n}{450}[/tex]
The next higher harmonic will be
[tex]750 = \dfrac{343(n + 2)}{4L}[/tex]
make 4L the subject of the formula
[tex]4L = \dfrac{343(n + 2)}{ 750}[/tex]
Equate the two 4L
[tex]\dfrac{343n}{450} = \dfrac{343( n + 2)}{750}[/tex]
cross multiply
[tex]257250n = 154350( n + 2 )[/tex]
[tex]257250n = 154350n + 308700[/tex]
collect the likes term
[tex]257250n - 154350n = 308700[/tex]
[tex]102900n = 308700[/tex]
[tex]n =\dfrac{ 308700}{102900}[/tex]
n = 3
Given that the speed of sound in air is 343 m/s, The length of the tube can be calculate by using the same formula.
[tex]F = \dfrac{nV}{4L}[/tex]
[tex]450 = \dfrac{3(343)}{4L}[/tex]
[tex]4L = \dfrac{1029}{450}[/tex]
4L = 2.28
[tex]L = \dfrac{2.28}{4}[/tex]
L = 0.57 m
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Two charges of +2.6 μC and –5.4 μC experience an attractive force of 6.5 mN. What is the separation between the charges?
Answer:
Explanation:
[tex]q_{1} =+2.6 X10^{_-6}C \\q_{2} =-5.4 X10^{_-6}C \\F=6.5mN\\F=\frac{Kq_{1}q_{2} }{d^{2} }[/tex]
If I am driving on the highway and see a pig on the road and go from 60m/s to 20 m/s in 5 s. What is my acceleration?
Explanation:
Acceleration = final velocity - initial velocity
______________________
time taken
= 20 m/s - 60m/s
________________
5seconds
= -40 m/s
_______
5 seconds
= -8m/s^2
You throw a ball straight up into the air with velocity 40 ft/sec and catch it (at the same height) when it comes back down. What is the total distance traveled by the ball
The total distance traveled by the ball is determined as 49.68 ft.
Height travelled by the ball
The height travelled by the ball or the maximum height attained by the ball is calculated as follows;
v² = u² - 2gh
at maximum height, v = 00 = u² - 2gh
2gh = u²
h = u²/2g
h = (40²)/(2 x 32.2)
h = 24.84 ft
Total distance = 2 x 24.84 ft = 49.68 ft
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A surfacing whale in an aquarium produces water wave crests having an amplitude of 1.2 meters every 0.40 second. If the water wave travels at 4.5 meters per second, the wavelength of the wave is
The wavelength of the water wave having a amplitude of 1.2 meters every 0.4 seconds is 1.8 m .
What is wavelength?Wavelength is the total distance traveled by a wave in one cycle.
To calculate the wavelength of the wave, we use the formula connecting
speed, wavelength, and Period.
Formula:
v = λ/T........... Equation 1Where:
v = Velocity of the waveλ = WavelengthT = PeriodMake λ the subject of the equation
λ = vT............ Equation 2From the question,
Given:
v = 4.5 m/sT = 0.40 sSubstitute these values into equation 2
λ = (4.5×0.4)λ = 1.8 mHence, The wavelength of the water wave having a amplitude of 1.2 meters every 0.4 seconds is 1.8 m .
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How long will it be before the moon will be too far away from Earth to totally cover the sun after a solar eclipse?
Answer:
600 million years
Explanation:
i think its pretty simple and u should memorize it :)
help please!
will give brainliest to the correct answer.
question; the work one by friction force to stop a car of mass 1000 kg moves with velocity 72km/h is ..........
a) 72 x 10³ J
b) 2 x 10⁴ J
c) 2 x 10⁵ J
d) 4 x 10⁵ J
an explanation for future reference would be appreciated^^
Answer:
b)
Explanation:
The work done by friction is equal to the all of the initial Kinetic Energy lost when the vehicle comes to a complete stop
KE = 1/2 m v^2
72 km / hr = 20 m/s
KE = 1/2 * 1000 kg * (20 m/s)^2 = 200 000 J = 2 x 10^4 J
A 1.5 x 105 kg train is accelerating. The force applied to the train is 7.0 x 104 N. What is the train’s acceleration?
Answer:
See below
Explanation:
F = ma
7 X 10^4 = 1.05 x 10^5 * a
a = .666 = 2/3 m/s^2
2. At the earth’s surface, a projectile is launched straight up at a speed of 10. 0 km/s. To what height will it rise? ignore air resist
Answer:
5.097 m
Explanation:
H = vo t - 1/2 a t^2
= 10t - 1/2 (9.81) t^2 max occurs at -b/2a = 10/9.81=1.0194 sec
sub in this 't' value to get H =5.097 m
I need help with my homework please?
Answer:
i need the describtion like what i need to do
Explanation:
Answer:
it's easy bro once try yourself if you can't then l am here
Identify the amplitude of the wave using the picture below.
Answer:
Line 2 is the amplitude
Explanation:
The amplitude is the distance from equilibrium to the top of the maximum or minimum of the wave.
How is sound intensity measured?
Answer:
Sound intensity is measured with a sound level meter or Sound pressure Level (SPL) Meter.
Explanation:-
It measure sound intensity is the sound pressure level. The unit of measurement is decibels.
During which season is the sun highest in the sky?.
Answer: summer
Explanation:
In June, when the Earth is tilted towards Sun and the Sun reaches its highest point in the sky, that is called the summer solsticeand is the longest day of the year.
A radar transmits a signal towards an aeroplane. The velocity of the signal is 3.0 x 10^8 m/s. After 0.0036 s, the radar detects the reflected signal. What is the distance of the aeroplane from the radar?
The distance of the airplane from the radar will be 1.08×10⁶ m. Distance can refer to a physical length.
What is distance?Distance is a numerical representation of the distance between two objects or locations.
The distance of the airplane from the radar is found by the formula;
Distance = velocity × time
Distance = 3.0 x 10^8 m/s× 0.0036 s,
Distance = 1.08×10⁶ m.
Hence, the distance of the airplane from the radar will be 1.08×10⁶ m.
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For a bike that went a distance of 100 meters in 45 seconds
southeast to his friend's house. what would his velocity be?
Answer:
velocity = Displacement
Time
Velocity = 100m 45° SE
45s
= 2. 11m/s 45° SE
What number and type of hybrid orbital(s) form(s) when one p and one s atomic orbital mix?
Two equivalent hybridized orbitals will form from the mixing of one s-orbital and one p-orbital, that is (sp) orbital.
What are orbitals?Orbital is the place around nucleus where mostly the electrons are present. There are four types of orbitals are present, s, p, d, and f.
The orbitals that are formed by the mixing of these orbitals are called hybrid orbitals.
Thus, two equivalent hybridized orbitals will form from the mixing of one s-orbital and one p-orbital, that is (sp) orbital.
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Acceleration depends on which two factors?
Answer:
a = (V2 - V1) / t equation defining acceleration
Acceleration depends on velocity change and the time interval involved.
23
Select the correct answer.
Jeff has 10 grams of water and 10 grams of vegetable oil in separate containers. Both liquids have a temperature of 24°C. Jeff heats both liquids
over a flame for five minutes. When he's finished, he discovers that the temperature of the oil increased more than the temperature of the
water. What can Jeff conclude from this experiment?
OA. Vegetable oil is a better conductor of heat than water.
OB. Water is a better conductor of heat than vegetable oil.
OC. Vegetable oil has a higher heat capacity than water.
OD. Vegetable oil has a lower heat capacity than water.
O E. Vegetable oil is a good insulator.
Reset
Next
Answer: Vegetable oil has a higher heat capacity than water. Option C is correct.
It is given 10 grams of water and 10 grams of vegetable oil in separate containers. Both liquids have a temperature of 24°C. Now Jeff heats both liquids over a flame for five minutes.
It is required to find why the temperature of the oil increased more than the temperature of the water.
What can Jeff conclude from his experiment?Heat capacity determines the heat that is supplied to the body that will be caused by heat of the body.
The vegetable oil warmed more when Jeff increased the temperature. This is because the hydrogen bonding present is responsible for this as oil catches fire easily.
Also to change the temperature of the water, we need more energy per gram of particular liquid.
Therefore, Vegetable oil has a higher heat capacity than water as water requires more energy.
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An electron confined in a one-dimensional box is observed, at different times, to have energies of 12 ev, 27 ev, and 48 ev
Answer:
l=3.5 x 10^-10m
Explanation:
just toook the test got it right good luck!
6. For a cell to produce a current, the
electrodes of the cell must.
a. have a potential difference.
b. be in a liquid.
c. be at two different temperatures.
d. be flattened,
Answer:
for a cell to produce a current the cell electrodes of the cell must have a potential difference option A is the correct answer
if a tree falls in the wood and no won sees it dose it exist
what particle collides with a fissionable nucleus in order to begin the fission process?
Answer:
neutrons
Explanation:
Neutrons are usually released when fission takes place. Fission of a nucleus may be spontaneous, that is, it may happen at random due to internal processes within the nucleus. Fission can also be induced by bombarding a nucleus with a neutron.
Which of the following is a pure
substance?
A. Heterogenous mixture
B. Homogenous mixture
C. Solution
D. Element
Answer:
B. Homogenous mixture
Explanation:
........
An astronaut lands on a new, recently discovered planet in a different star system. The astronaut measures the acceleration due to gravity on the planet to be 12m/s2, and the mass of the planet is measured to be 7. 5E23kg. What is the radius of the new planet?
Answer:
The radius of the new planet is ~2.04 * 10⁶ m, or 2,041,752 m.
Explanation:
We can use Newton's Law of Universal Gravitation:
[tex]\displaystyle F_g=G\frac{Mm}{r^2}[/tex]Let's look at Newton's 2nd Law:
[tex]F=ma[/tex]We can set these equations equal to each other:
[tex]\displaystyle G\frac{Mm}{r^2} =ma[/tex]The mass of the second mass (astronaut) cancels out. We are left with:
[tex]\displaystyle G\frac{M}{r^2} =a[/tex]We are solving for the radius of the new planet, so we can rearrange the equation:
[tex]\displaystyle r=\sqrt{\frac{GM}{a} }[/tex]Substitute in our known values given in the problem (G = 6.67 * 10⁻¹¹ ; M = 7.5 * 10²³ ; a = 12).
[tex]\displaystyle r =\sqrt{\frac{(6.67\times 10^{-11})(7.5 \times 10^{23}}{12} }[/tex][tex]r=2.04 \times 10^6[/tex]The radius of the new planet is ~2.04 * 10⁶ m.