An average cyclist generates about 183 watts while doing 19 mph or 30.4 kph. Power = force × velocity. Force of a pedalling applied by a human for achieving 30.4 kph = 183/8.44 = 21.68 newtons. This is for upright bicycles.
Which of the following are two factors that determine speed?
a. acceleration and time
b. distance and time
c. velocity and time
d. motion and time
Answer:
B) Distance and Time
Explanation:
Equation for speed: S = D / T
Speed equals the distance you traveled divided by the amount of time it took to get to that destination.
The two factors which are required to determine the speed of a object are distance traveled by it and time taken by it.
What is speed?The speed is the rate at which the total distance by a object is traveled in the time taken.
Speed of a object can be given as,
[tex]s=\dfrac{d}{t}[/tex]
Here, (d) is the distance traveled by the object and (t) is time taken but the object to cover that distance.
As the unit of the distance is measured in the meter and the time measure in the second. Thus the speed of a object is measured in the meter per second.
In the vehicles the speed of vehicle is also measured in the kilometre per hour or miles per hour.
Hence, the two factors which are required to determine the speed of a object are distance traveled by it and time taken by it.
Thus the option B is the correct option.
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A 1 kg ball is rolling at 3 m/s.
Answer:
It will roll 9 meters in 3 seconds
Explanation:
3 m/s times 3 is 9
Thanks for warning me.
I'll be careful to stay out of its way.
Do you have a question to ask ?
Which of the following planets has a diameter that is larger than the diameter of the Earth?
Answer:
Jupiter
Explanation:
Jupiter is the largest planet in our solar system and is about 11 times larger than earth.
A popcorn-maker transfers 250 J of energy into other energy stores every second. What is its power?
Answer: 250 watts
Explanation:
energy=250J
Time=1 sec
Power=energy ➗ time
Power=250 ➗ 1
Power=250
Power is 250 watts
According to the question,
Energy,
250 JTime,
1 secondThe formula,
→ [tex]Power =\frac{Energy}{Time}[/tex]
By substituting the values, we get
[tex]= \frac{250}{1}[/tex]
[tex]= 250 \ Watts[/tex]
Thus the above approach is right.
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When steam condenses
a. it changes from the gas phase to the liquid phase.
b. it gives off heat.
c. molecules move closer together.
d. all of the above occur.
Answer:
all of the above?
Explanation:
I think that is
An air-track glider attached to a spring oscillates between the 10.0 cm mark and the 61.0 cm mark on the track. The glider completes 11.0 oscillations in 31.0 s
Answer:
T = 2.82 seconds.
The frequency [tex]\mathbf{f = 0.36 \ Hz}[/tex]
Amplitude A = 25.5 cm
The maximum speed of the glider is [tex]\mathbf{v = 56.87 \ rad/s}[/tex]
Explanation:
Given that:
the time taken for 11 oscillations is 31 seconds ;
SO, the time taken for one oscillation is :
[tex]T = \frac{31}{11}[/tex]
T = 2.82 seconds.
The formula for calculating frequency can be expressed as :
[tex]f = \frac{1}{T}[/tex]
[tex]f = \frac{1}{2.82}[/tex]
[tex]\mathbf{f = 0.36 \ Hz}[/tex]
The amplitude is determined by using the formula:
[tex]A = \frac{d}{2}[/tex]
The limits that the spring makes the oscillations are from 10 cm to 61 cm.
The distance of the glider is, d = (61 - 10 )cm = 51 cm
Replacing 51 for d in the above equation
[tex]A = \frac{51}{2}[/tex]
A = 25.5 cm
The maximum speed of the glider is:
[tex]v = A \omega[/tex]
where ;
[tex]\omega = \frac{2 \pi}{T}[/tex]
[tex]\omega = \frac{2 \pi}{2.82}[/tex]
[tex]\omega = 2.23 \ rad/s[/tex]
[tex]v = A \omega[/tex]
[tex]v = 25.5 *2.23[/tex]
[tex]\mathbf{v = 56.87 \ rad/s}[/tex]
if the 50 kg objects slows down to a velocity of 1 m/s how much kinetic energy does it have?
Answer: 25
Explanation:
The kinetic energy of the object moving at the given mass and velocity is 25 J.
The given parameters;
mass of the object, m = 50 kgvelocity of the object, v = 1 m/sThe kinetic energy of the object moving at the given mass and velocity is calculated as follows;
K.E = ¹/₂mv²
K.E = ¹/₂ x 50 x 1²
K.E = 25 J
Thus, the kinetic energy of the object moving at the given mass and velocity is 25 J.
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(x) A change in position is called:
(a) Speed
(b) velocity
(c) displacement
(d) distance
Answer:
(c) displacement
sure answer...
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please answer I'll give brainlist
Assuming the sound wave moves with the speed of air ( 340 m/s), what is the wavelength of the wave?
Answer:
suppose frequency of sound = 100Hz
then wavelength = speed/ frequency
= 340/100= 3.4 m
Un trineo de 8.00kg se mueve en línea recta sobre una superficie horizontal sin fricción.En cierto punto su rapidez es de 4.00m/s 2.50m más adelante es de 6.00m/s
Answer:
An 8 kg sled mass moves in a straight line on a surface without horizontal friction at a certain point its speed is 4 m / s 2.50 m later its speed is 6 m / s using the work and energy theorem, determine the force acting on the sled assuming it is constant and acts in the direction of the sled movement
The force acting on the 8 kg sled has a value of 32 N.
Explanation:
We have initially look for the work that is applied to the sled, and this will be nothing more than the difference in kinetic energy from the end point to the initial, then:
ΔEc = Ec₂ - Ec₁
ΔEc = 0.5 * m * [V₂² - V₁²]
ΔEc = 0.5* 8 kg * [(6m / s) ² - (4m / s) ²]
ΔEc = 80 J
So, the work is 80 J, now we know that work is a relation distance and force , such that:
W = F * d
F = W / d
F = (80 J) / (2.50 m)
F = 32 N
Therefore, the force acting on the sled is 32 N.
Which structure connects muscles to bone?
Answer: tendons connect muscles to bones
Explanation:
What are the pros and cons of nuclear fission
Answer:
Low Greenhouse Gas Emissions. ...
High Power Output. ...
Inexpensive Electricity. ...
Nuclear Energy Doesn't Rely on Fossil Fuels. ...
Economic Impact. ...
Back-end Environmental Impact. ...
Past History of Nuclear Accidents. ...
High Up-Front and End Stage Cost.
you drop a rock off of a cliff, and it hits the ground 8.1 seconds later. how tall is the cliff?
Answer:
the answers is 321 m
Explanation:
here's a picture of it
explain nuclear fusion briefly
Answer:
Nuclear fusion is the process in which two atomic nuclei are fused together into a larger single nucleus, releasing energy in the process. ... In proton-proton fusion, four hydrogen atoms are fused into a single helium-4 atom, releasing a lot of energy in the process.
Explanation:
Choose the best definition for velocity
1. How fast something is going
2. Speed in a certain direction
3. Which direction something is going
4. Something speeding up
a bicyclist rides with a constant speed of 7 m/s. What is his initial speed?
Answer:
initial speed of the bicker = 7m/s
whoever answers correctly first will get brainiest
whats my middle name....?
clues:
a_n_l i_ e
3 missing letters
fill in the blanks! hehe
Answer:
annalise
Explanation:
::::::::::)))))))))
What flows in a circuit to generate a current?
A. Protons
B. Electrons
C. Neutrons
What major purposes do barrier islands serve?
Answer:
Barrier islands serve two main functions. First, they protect the coastlines from severe storm damage. Second, they harbor several habitats that are refuges for wildlife.
Explanation:
4. The batteries on electric vehicles are recharged using electricity from either a wall socket or dedicated charging
unit.
A) O True
B) O False
Answer:
Hey!
Your answer is A) TRUE!
Explanation:
The electricity in this instance is called "grid-electricity" because it has come from a generation plant elsewhere instead of recharging the batteries via Kinetic/Potential energy...
Uranium-235 has 92 protons. How many neutrons does it have?
Answer:
146 neutrons.
Explanation:
plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz mark me brainliest
Answer: The atomic number of uranium (see periodic table) is 92, and the mass number of the isotope is given as 238. Therefore, it has 92 protons, 92 electrons, and 238 — 92 : 146 neutrons.
Explanation:
A balance between gravity and bouyancy is called
Answer:
I believe it is isostasy
Explanation:
Intro to Springs and Hooke’s law
can someone tell me the answer for both of these pleaseeee i need it asap!!! i will give brainlist!!
Answer:
1/ decreases
2/ yes;
In general there is no relationship, and any combinations of frequencies and amplitudes are allowed.
Explanation:
Explanation for 1/ - please see the picture attached below
The life cycle of stars may be boiled down into a tug of war, lasting billions of years, between two basic forces. In your own words, describe these forces, and identify which of the two eventually "wins" the battle.
Answer:
Stars are very massive stellar objects, which means that they have a very intense force of gravity. This is the first of the forces entering this "war".
In addition to that, due to the force of gravity that drives the star to contract, the process known as fusion occurs (the union of atoms of one element that results in another element, hydrogen fuses in stars to produce helium). The fusion created in the high temperatures of the center of the star generates an enormous amount of energy (which causes the stars to shine) and a force going outward of the star counteracting gravity, this is the second force in the "war" .
In a stable star these two forces (gravity going inward and the pressure created by the fusion going outward ) are in balance, preventing the star from exploding or collapsing. But eventually the star exhausts its "fuel" (hydrogen atoms) to produce fusion within it (although stars also fuse helium and other heavier elements, but once the hydrogen is finished the star is near its end), which decreases the force outward from the star, making the force that wins this battle to be the force of gravity.
When the force of gravity wins, the star collapses on itself and from here, depending on the star's mass, several things can happen, such as the star becoming a white dwarf, a supernova, even a black hole.
The life cycle of stars may be boiled down into a tug of war, lasting billions of years, between two basic forces -
Pressure due to fusion reactions pushes outwards.Gravity pulls inwards to keep the star in equilibrium.And gravity wins the battle in the end.Stars are very massive stellar objects and remain the longest in the stage when it is burning Hydrogen into Helium.
Stars have a very intense force of gravity that drives the star to contract, the process known as fusion occurs.Due to fusion, high temperatures of the center of the star create an enormous amount of energy and a force of pressure going outward of the star counteracting gravityGravity going inward and the pressure created by the fusion going outward is in balance, preventing the star from exploding or collapsing.Due to exhausting hydrogen atoms, fusion stops eventually and it decreases the force outward from the star, making the force that wins this battle to be the force of gravity.Thus,
The life cycle of stars may be boiled down into a tug of war, lasting billions of years, between two basic forces -
Pressure due to fusion reactions pushes outwards.Gravity pulls inwards to keep the star in equilibrium.And gravity wins the battle in the end.Learn more:
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Which statement is NOT an advantage of renewable resources? A They produce clean energy. B They are expensive to collect and transform into energy. C They are safe for the environment. D They replenish quickly.
Answer:
B. They are expensive to collect and transform into energy.
Explanation:
All of the other options are positive aspects of renewable resources. B is the only disadvantage of renewable resources given in the question.
Answer:
They are expensive to collect and transform into energy.
Explanation:
Edge
Rafael swings a baseball bat with a force of 25 N. The baseball bat exerts a force of 5 N on the baseball. What is the mechanical advantage of the baseball bat? The mechanical advantage of the baseball bat is
Answer:
0.2
Explanation:
Mechanical Advantage is defined as the ratio of force output with respect to the force input. Thus,
MA = output / input
MA = 5 / 25
MA = 1/5
MA = 0.2
Since this value is less then one. Even though it's tagged a mechanical advantage, in reality it would be mechanical disadvantage.
Therefore, we can say that the mechanical advantage of the baseball bat is 0.2
Answer:
0.2
Explanation:
Each gas sample has the same temperature and pressure. which sample occupies the greatest volume? each gas sample has the same temperature and pressure. which sample occupies the greatest volume? 40.0 gar 20.0 gne 20.0 gh2 4.0 ghe
Answer:
20 gram of H as the greastest volume
Explanation:
Each gas sample has the same temperature and pressure. which sample occupies the greatest volume? each gas sample has the same temperature and pressure. which sample occupies the greatest volume? 40.0 gar 20.0 gne 20.0 gh2 4.0 ghe
Given that,
40.0 g of Ar
20.0 g of Ne
20.0 g of h
24.0 g of he
The ideal gas equation ; Pv = nRT
where P is the pressure, V is the volume, R is the gas constant, T is the temperature, n is the number of mole
which is equal to
n = m / M
where m is the given mass
M is the molar mass
The given gas sample are at the same temperature and pressure,
So, the temperature, pressure and gas constant are fixed.
Therefore the volume is proportional to the given mass and molar mass
V ∝ m/M
Substitute the given mass and molar mass of given masses for comparison
No of mole of Ar = mass / molar mass
= 40 / 40 = 1 mole
No of mole of Ne = mass / molar mass
= 20 / 20 = 1 mole
No of mole of h = mass / molar mass
= 20 / 1 = 20 mole
No of mole of he = mass / molar mass
= 24 / 4 = 6 mole
Hence, 20 gram of H as the greastest volume
Becky has a shower and uses 20,000g of water with a specific heat capacity of 4200J/KG. When the water is supplied with 336,000J of energy, it heats up to 50^c. What is the startig temperature of the water?
Answer:
46°C
Explanation:
q = mCΔT
336,000 J = (20 kg) (4200 J/kg/°C) (50°C − T)
T = 46°C
Becky takes a shower, and he uses 20,000 g of water with specific heat of 4200 J/kg then the starting temperature of the water will be equal to 46 °C.
What is Specific heat?Specific heat is the amount of energy needed to raise a product's temperature by one degree Celsius per gram. Traditionally, the units of heat capacity are calorie or joules per gram per degree Celsius. The specific heat of water, for instance, is 1 calorie (or 4.186 joules) per gram per degree Celsius.
In the 18th century, the Scottish scientist Joseph Black noted that equivalent masses of various substances required varying quantities of heat to increase them across the same ambient temperature. Based on this discovery, he developed the theory of specific heat.
From the given data in the question,
q = mCΔT
Here ΔT is the change in the temperature.
336,000 J = (20 kg) × (4200) × (50 °C − T)
T = 46 °C
Therefore, the starting temperature of the water is 46 °C.
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How are the electric field lines around a positive charge affected when a second positive charge is near it?
Answer:Because it likes to repel and attract opposites
