Answer:
The answer is option C.Half as much
The correct answer is four times as much.
Let the friend's mass be m, then according to the question the bodybuilder's mass will be 2m.
Now they both cover the same distance but the bodybuilder takes 4s and his friend takes 2s. Hence, if the time taken by the friend is t then the bodybuilder takes 2t time.
That means if the velocity of the bodybuilder is v then the velocity of his friend will be 2v.
Now, Power is defined as the rate of work done.
P = W/t
and work done is the change in kinetic energy.
Now the power generated by the bodybuilder is:
[tex]P_{b}=\frac{\frac{1}{2}2mv^{2} }{2t} \\\\P_b=\frac{mv^2}{2t}[/tex] ............(1)
power generated by the friend is :
[tex]P_{f}=\frac{\frac{1}{2}m(2v)^{2} }{t} \\\\P_b=\frac{4mv^2}{2t}[/tex].............(2)
Comparing (1) and (2) we get:
The friend generates four times as much power as the bodybuilder.
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How should Simon use the theory of relativity to
describe what the astronaut must do in order to hit the
button?
Simon is writing a story about an astronaut whose
spacecraft has been boarded by space pirates. The
astronaut has her lucky penny in her hand behind her
back as the space pirates break into the control room.
She has just locked the controls so that the ship is
accelerating in the direction of the control room's
ceiling. Simon wants the astronaut to use the penny to
hit a button on the control panel to turn off the lights
and escape. The button is located a short distance
behind and below the astronaut's hands.
O The astronaut should toss the penny straight up as
it will appear to fall in an arc because objects in an
accelerating frame of reference behave in the same
way as they would in a gravity field.
O The astronaut should just let the penny go, as the
control panel will accelerate upward and curve
toward the astronaut because there is no gravity
field
O The astronaut should toss the penny horizontally
straight behind her as it will appear to fall in an arc
because objects in an accelerating frame of
reference behave in the same way as they would in
a gravity field.
The astronaut should toss the
Answer:
C
Explanation:
Answer:
c
Explanation:
edge
Under what condition do the values of gravitational
force, and gravitational constant become same/
equal
Answer:
values of gravitational force and gravitational constant become same or equal when product of masses involved equals the square of distance between them
Explanation:
A boat moves through the water of a river at 10m/s relative to the water, regardless of the boat ‘s direction . If the water in the river is flowing at n1.50m/s , how long does it take the boat to make a round trip consisting of of 300m displacement downstream followed by a 300m displacement upstream?
Answer:
The appropriate solution is "61.37 s".
Explanation:
The given values are:
Boat moves,
= 10 m/s
Water flowing,
= 1.50 m/s
Displacement,
d = 300 m
Now,
The boat is travelling,
= [tex]10+1.50[/tex]
= [tex]11.5 \ m/s[/tex]
Travelling such distance for 300 m will be:
⇒ [tex]v = \frac{d}{t} \ sot \ t[/tex]
[tex]=\frac{d}{v}[/tex]
On putting the values, we get
[tex]=\frac{300}{11.5}[/tex]
[tex]=26.08 \ s[/tex]
Throughout the opposite direction, when the boat seems to be travelling then,
= [tex]10-1.50[/tex]
= [tex]8.5 \ m/s[/tex]
Travelling such distance for 300 m will be:
⇒ [tex]v=\frac{v}{t} \ sot \ t[/tex]
[tex]=\frac{d}{v}[/tex]
On putting the values, we get
[tex]=\frac{300}{8.5}[/tex]
[tex]=35.29 \ s[/tex]
hence,
The time taken by the boat will be:
= [tex]26.08+35.29[/tex]
= [tex]61.37 \ s[/tex]
convert 40 HP into watt
Answer: 29828 watts
Explanation: hope that helped bro
Which of the following is the unit of momentum
a) ms-1 b) Kg ms-1
c) Ns d) Kgms-2
Answer:
the answer is (b) Kg ms-1 .
What is the total resistance of the circuit shown below?
(Please help)
[tex]\huge{ \mathfrak{ \underline{Answer : }}} [/tex]
In the given figure, the resistors are joined in parallel connection.
Let's solve for total resistance [tex]R_t[/tex] :
[tex] \dfrac{1}{R_t} = \dfrac{1}{ R_1} + \dfrac{1}{R_2} [/tex][tex] \dfrac{1}{R_t} = \dfrac{1}{20} + \dfrac{1}{30} [/tex][tex]\dfrac{1}{R_t} = \dfrac{3 + 2}{60} [/tex][tex]\dfrac{1}{R_t} = \dfrac{5}{60} [/tex][tex]{R_t} = \dfrac{60}{5} [/tex][tex]{R_t} = 12 \: \: ohms[/tex]____________________________
[tex]\mathrm{ \#TeeNForeveR}[/tex]
PLEASE HELP ASAP, WILL MARK BRAINLIEST!!!!
Answer:
it's yellowish orange (3)
Explanation:
A grapefruit has a pH of somewhere between 2.9-3.3 and it is quite acidic. The juice of a grapefruit can cause erosion of tooth enamel and cause damage to one's teeth if ate excessively
How are electrical charges similar to magnets?
Answer:
The two types of forces are related; a moving magnet can make electrical charges move, cause an electric current, and in turn cause magnetism. ... Objects that have the same charge, both positive or both negative, repel each other, and those with opposite charges attract each other.
Explanation:
what makes global winds curve rather than move in a straight line?
Answer:
because the Earth rotates, circulating air is deflected. Instead of circulating in a straight pattern, the air deflects toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere, resulting in curved paths. This deflection is called the Coriolis effect.
Based on the model, which three factors might cause this change in the apparent movements of the stars? A. Earth's rotation on its axis B. Earth's revolution around the Sun C. The tilt of Earth's axis D. Earth's changing distance from the Sun
Answer:
I think it's A C and D sry if I'm wrong UwU
Which statement did Ernest Rutherford make about atoms?
A. Atoms are different for different elements.
B. The atom has a small, dense center.
O C. The atom is made up of smaller particles.
D. The energy of an electron depends on its specific orbit.
The statement did Ernest Rutherford make about atoms will be the atom has a small, dense center. Then the correct option is B.
What is the Ernest Rutherford model?The majority of alpha particles went right through the gold foil, signifying that particles are mostly made up of empty space. Several alpha particles were mildly distracted, indicating interactions with positively charged particles within the unit. Some alpha particles were spread at wide degrees, with a few even returning to the source.
Rutherford characterized the atom in 1911 as having an understanding, dense, and ionized center termed the nucleus. Rutherford discovered that the mass of an atom is possessed in its nucleus.
The atom has a small, dense center. Thus, option B is correct.
More about the Ernest Rutherford model link is given below.
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Can somebody answer this science question NO LINKS !!!!
Answer:
position 1
Explanation:
in position 2 and three it would have less energy cause there is less force being exerted to give it that push, but at the end position and the first position there is going to be more force and energy behind the ball.
Velocity is often described as speed with a __________.
Answer:
rate
Explanation:
Note that speed has no direction (it is a scalar) and the velocity at any instant is simply the speed value with a direction.
PLS PLS HELP FOR BRAINLIEST!!!!!!!!!!!!
Option A: The air molecule moves from the girl's mouth to the ear of her friend
A tank has the shape of an inverted circular cone with height 16m and base radius 3m. The tank is filled with water to a height of 9m. Find the work required to empty the tank by pumping all of the water over the top of the tank. Use the fact that acceleration due to gravity is 9.8 m/sec2 and the density of water is 1000kg/m3. Round your answer to the nearest kilojoule.
Answer:
[tex]W=17085KJ[/tex]
Explanation:
From the question we are told that:
Height [tex]H=16m[/tex]
Radius [tex]R=3[/tex]
Height of water [tex]H_w=9m[/tex]
Gravity [tex]g=9.8m/s[/tex]
Density of water [tex]\rho=1000kg/m^3[/tex]
Generally the equation for Volume of water is mathematically given by
[tex]dv=\pi*r^2dy[/tex]
[tex]dv=\frac{\piR^2}{H^2}(H-y)^2dy[/tex]
Where
y is a random height taken to define dv
Generally the equation for Work done to pump water is mathematically given by
[tex]dw=(pdv)g (H-y)[/tex]
Substituting dv
[tex]dw=(p(=\frac{\piR^2}{H^2}(H-y)^2dy))g (H-y)[/tex]
[tex]dw=\frac{\rho*g*R^2}{H^2}(H-y)^3dy[/tex]
Therefore
[tex]W=\int dw[/tex]
[tex]W=\int(\frac{\rho*g*R^2}{H^2}(H-y)^3)dy[/tex]
[tex]W=\rho*g*R^2}{H^2}\int((H-y)^3)dy)[/tex]
[tex]W=\frac{1000*9.8*3.142*3^2}{9^2}[((9-y)^3)}^9_0[/tex]
[tex]W=3420.84*0.25[2401-65536][/tex]
[tex]W=17084965.5J[/tex]
[tex]W=17085KJ[/tex]
'
'
what characteristic describes what happens during a physical change
What kind of image is formed by an object that is placed beyond the center of curvature on the principal axis of a concave mirror?
A.
real, inverted, the same size as the object, and at the same distance as the object
B.
real, inverted, larger than the object, and farther from the mirror than the object
C.
virtual, upright, left-right reversal, the same size as the object, and at the same distance as the object
D.
real, inverted, smaller than the object, and closer to the mirror than the object
E.
virtual, upright, larger than the object, and farther from the mirror than the object
Answer:D.
Real, inverted, smaller than the object, and closer to the mirror than the object
Explanation: Real images will be inverted. As it is beyond the centre of curvature it is also beyond 2F which means that the image is inside the centre of curvature ( between F and 2F from the mirror ) As the image is closer to the mirror than the object it must be diminished in size
The information shows the masses after the compounds are balanced.
2MgO + 2Cl2 → 2MgCl2 + O2
85g + 156g → 188g + ?
If the following materials are used during the reaction of magnesium, oxygen, and chlorine, what mass oxygen would we expect to see after the reaction and why?
A.
53g of O2, because all mass must be conserved.
B.
241g of O2, because all mass must be conserved.
C.
42.5g of O2, because all mass must be conserved, it would be half of the compound MgO in the products.
D.
106g of O2, because all mass must be conserved, it would be double the compound MgO in the products.
Answer:
The information shows the masses after the compounds are balanced.
2MgO + 2Cl2 → 2MgCl2 + O2
85g + 156g → 188g + 53g
as total mass in reactant is equal to product.
A.
53g of O2, because all mass must be conserved.
Ano ang kahulugan ng padamdam?
Ang pandamdam ay nagpapahayag ng matinding damdamin.
hope this helps!
please give me brainliest.
thank you!
The frequency range for a normal human ear is between 20 Hz and 20 000 Hz. Using 330 m/s as the speed of sound, a. Calculate the shortest wavelength of sound that can be heard: b. Calculate the longest wavelength of sound that can be heard:
Answer:
(a) 0.0165 m
(b) 16.5 m
Explanation:
Applying,
v = λf.................. Equation 1
Where v = velocity, f = frequency, λ = wave length.
make λ the subject of the equation
λ = v/f............. Equation 2
(a) Shortest wavelength (λ')
Given: f' = 20000 Hz, v = 330 m/s
Substitute these values into equation 2
λ' = 330/20000
λ' = 0.0165 m
(b) Longest wavelength (λ)
Given: v = 330 m/s, f = 20 Hz
Substitute these value into equation 2
λ = 330/20
λ = 16.5 m
a wave has a frequency of 10Hz and a wavelength of 30 m. What's its velocity?
A tourist follows a passage that takes her 160 m west, then 180.m at an angle of 45.0∘ south of east, and finally 250 m at an angle 35.0∘ north of east. The total journey takes 12 minutes. (4)
a. Calculate the magnitude of her displacement from her original position.
b. She measures the distance she has walked to a precision of 5%. She times her total journey to ±20 s. (4)
(i) What is her average speed?
(ii) What is the absolute uncertainty on her absolute speed?
Answer:
a) R = 172.82 m, 5.3 north of east b) v = (0.24 ± 0.01) m / s
Explanation:
a) the displacement is a vector, so the easiest method to lock is looking for each component
let's start decomposing the vectors
x₁ = - 160 m
second shift
angle 45 south of east
cos (-45) = x₂ / d₂
sin (-45) = y₂ / d₂
x₂ = d₂ cos 45
y₂ = -d₂ sin 45
x₂ = 180 cos 45 = 127.28 m
y₂ = -180 sin 45 = - 127.28 m
third shift
cos 35 = x₃ / d₃
sin 35 = y₃ / d₃
x₃ = d₃ cos 35
y₃ = d₃ sin 35
x₃ = 250 cos 35 = 204.79 m
y₃ = 250 sin 35 = 143.39 m ₃
X axis
x_total = x₁ + x₂ + x₃
x_total = -160 +127.28 +204.79
x_total = 172.07 m
Y axis
y_total = y₁ + y₂ + y₃
y_total = 0 - 127.28 + 143.39
y_total = 16.11 m
to compose the displacement we use the Pythagorean theorem
R = [tex]\sqrt{x^2 +y^2}[/tex]
R = [tex]\sqrt{172.07^2 + 16.11^2 }[/tex]
R = 172.82 m
in angle is
tan θ = y_total / x_total
ten θ = 16.11 / 172.07 = 0.0936
θ = tan⁻¹ 0.0936
θ = 5.3
angle is 5.3 north of east
b) the error in the distance is 5%,
e% = ΔR/R 100
ΔR = e% R / 100
ΔR = 5 172.82 / 100
ΔR = 8.6 m
the time error Dt = 20 s
We calculate the speed and this we calculate the error
v = R / t
v = 172.82 / 12 60
v = 0.240027 m / s
the error in this magnitude is
Δv = [tex]\frac{dv}{dR} \ \Delta R + \frac{dv}{dt} \ \Delta t[/tex]
Δv = [tex]\frac{1}{t} \ \Delta R + \frac{R}{t^2 } \ \Delta t[/tex]
Δv = [tex]\frac{ 8.6}{720} + \frac{172.82 \ 20}{720^2 }[/tex]
Δv = 0.013 m / s
the measurement result is
v = (0.24 ± 0.01) m / s
Which quantity must equal zero if a car is moving at a constant rate along a straight line?
A. direction of the car
B. energy of the car
C. speed of the car
D. acceleration of the car
The acceleration of the car must equal zero if a car is moving at a constant rate along a straight line.
What forces are acting on a car moving at a constant speed?A car moving at a constant speed (uniform motion) has all forces acting on it balanced. In this case, the two backward forces (air resistance and friction) perfectly balance the applied force of the wheels on the road in the opposite direction.
When the car is moving at a constant speed?Acceleration is defined as the rate of change in speed. So if the car is moving at a constant speed that means the rate of change in speed is zero. Hence, acceleration is zero.
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26. A physical science student is performing a thermodynamics experiment in the school laboratory. She takes a 30.0 g ice cube at 0. °C and melts it to water in a beaker over a laboratory burner. She then heats the water to boiling at 100. °C. Finally she boils the water entirely to steam at 100. °C. How much thermal energy was gained by the water during this entire process?
Answer:
The thermal energy gained by the water during the entire process is 90,372 J
Explanation:
Given;
mass of the ice cube, m = 30 g
latent heat of fusion of ice, L = 334 J/g
specific heat capacity of water, C = 4.184 J/g⁰C
latent heat of vaporization of water, h = 2260 J/g
The thermal energy gained by the water during the entire process is calculated as;
[tex]Q_t = Q_{fusion-ice} \ + \ Q_{boil-water} \ + \ Q_{steam-vapor}[/tex]
The heat of fusion of the ice at 0⁰C is calculated as;
[tex]Q_{fusion} = mL = 30\ g \times 334 J/g = 10020 \ J[/tex]
The heat of capacity of the water from 0⁰C to 100 ⁰C
[tex]Q_{boil-water} = mc\Delta \theta = mc(100-0) = 30\ g \times 4.184\ J/g^0C \times 100\ ^0C = 12,552 \ J[/tex]
The heat of vaporization of the steam at 100⁰C is calculated as;
[tex]Q_{steam} = mh= 30 g \times 2260 \ J/g= 67,800 \ J[/tex]
The thermal energy gained by the water during the entire procees;
Qt = 10,020 J + 12,552 J + 67,800 J
= 90,372 J
Therefore, the thermal energy gained by the water during the entire process is 90,372 J
A cube has height of 3cm. What is the volume of the cube?
Answer:
27[tex]cm^{3}[/tex]
Explanation:
The formula to find the volume of a cube is Volume=height cubed(or to the power of 3) so you would replace height with 3cm and get the equation Volume= 3 to the power of 3. So 3 x 3 x 3 = 27. So your answer would be:
27[tex]cm^{3}[/tex]
Do noble gases lose or gain electrons to get a full valence shell?
Which is a valid ionic compound?
sodide chlorine
sodium chlorine
sodium chloride
sodide chloride
Answer:
sodium chloride
Explanation:
Sodium chloride is an ionic compound. The ions of the sodium chloride compound is sodium ion and chloride ion. The sodium ion is cation while the chloride ion is an anion. Sodium chloride is a very stable compound because of the mutual attraction of oppositely charged ions.
How many atoms are in 2Mg3(PO4)2?
Answer:
13 atoms
Explanation:
Look at the subscripts.
“Mg₃” means that there are 3 magnesium atoms; “PO₄” means that there is 1 phosphorus atom and 4 oxygen atoms. But note that the PO₄ group has a subscript too: 2. This multiplies the atom count by 2, so you have 2 phosphorus atoms and 8 oxygen atoms.
3 + 2 + 8 = 13
(hope this helps can i plz have brainlist :D hehe)
There are total 26 atoms in 2Mg₃(PO₄)₂ compound. in one Mg₃(PO₄)₂, there are 13 atoms. Therefore, in 2 Mg₃(PO₄)₂ units, there are 26 atoms in total.
What is chemical formula ?A chemical formula is used identify a compound and to indicate chemical composition. The molecular formula of a compound is written based on the chemical symbol of each constituent atoms and their numbers.
The number of the atoms of each elements are represented as subscripts for each elemental symbol. In the given compound Mg₃(PO₄)₂, one unit of the compound contain 3 Mg atoms, and 2 PO₄ units means 2 P and 8 oxygen atoms. Hence there are 13 atoms in one unit.
There are 2 such units of this compound. Therefore, the total number of atoms present in 2 units Mg₃(PO₄)₂ compound is 13×2 =26.
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.
¿Crees que a más horas de sueño mayor descanso?
Answer:
La mayoría de los adultos necesitan entre 7 y 8 horas de sueño de buena calidad en un horario uniforme todas las noches.
Explanation:
Study of the ___________
effect helped convince
scientists that light could behave as both a particle and a wave.
Answer: Photoelectric effect
Explanation: