Answer:
120V
Explanation:
Given parameters:
Current = 6A
Resistance = 20Ω
Unknown:
Voltage = ?
Solution:
According to ohms law;
V = IR
Where V is the voltage
I is the current
R is the resistance
Now, insert the parameters and solve;
V = 6 x 20 = 120V
A tourist stands at the top of the Grand Canyon, holding a rock, overlooking the valley below. Find the final velocity and displacement of the rock after 4.0 seconds give the three initial conditions listed below:
a. the rock is dropped vertically from rest
b. the rock is tossed vertically upward with 8.0m/s of speed
c. The rock is tossed vertically downward with 8.0 m/s speed
Answer:
a. -39.2 m/s; -78.4 m
b. -31.2 m/s; -46.4 m
c. -47.2 m/s; -110.4 m
Explanation:
Part (a)We are given/can infer these variables:
t = 4.0 sa = -9.8 m/s² v_0 = 0 m/sWe want to find the displacement and the final velocity of the rock.
Δx = ?v = ?We can use this equation to find the final velocity:
v = v_0 + atPlug in the known variables into this equation.
v = 0 + (-9.8)(4.0) v = -9.8 * 4.0 v = -39.2 m/sThe final velocity of the rock is -39.2 m/s.
Now we can use this equation to find the displacement of the rock:
Δx = v_0 t + 1/2at²Plug in the known variables into this equation.
Δx = 0 * 4.0 + 1/2(-9.8)(4.0)² Δx = 1/2(-9.8)(4.0)² Δx = -4.9 * 16 Δx = -78.4 mThe displacement of the rock is -78.4 m.
Part (b)We are given/can infer these variables:
v_0 = 8.0 m/sa = -9.8 m/s²t = 4.0 sWe can use this equation to find the final velocity:
v = v_0 + atPlug in the known variables into this equation.
v = 8.0 + (-9.8)(4.0) v = 8.0 + -39.2 v = -31.2 m/sThe final velocity of the rock is -31.2 m/s.
We can use this equation to find the displacement:
Δx = v_0 t + 1/2at²Plug in known variables:
Δx = 8.0(4.0) + 1/2(-9.8)(4.0)² Δx = 32 - 4.9(16)Δx = -46.4 mThe displacement of the rock is -46.4 m.
Part (c)We are given/can infer these variables:
v_0 = -8.0 m/sa = -9.8 m/s²t = 4.0 sWe can use this equation to find the final velocity:
v = v_0 + atPlug in the known variables into this equation.
v = -8.0 + (-9.8)(4.0) v = -8.0 - 39.2 v = -47.2 m/sThe final velocity of the rock is -47.2 m/s.
We can use this equation to find the displacement:
Δx = v_0 t + 1/2at²Plug in known variables:
Δx = -8.0(4.0) + 1/2(-9.8)(4.0)²Δx = -32 - 4.9(16)Δx = -110.4 mThe displacement of the rock is -110.4 m.
What is the frequency of a wave with a wavelength of 2 and velocity of 20m/s?
Answer:
I think it is 10 Hz
Explanation:
Sorry if it's wrong
A boiling liquid absorbs thermal energy (heat) at a rate of 450 W. The specific latent heat of vaporisation is 2.7 × 106 J / kg
Explanation:
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The initial temperature of 150 g of ethanol was 22 C. What will be the final temperature of the ethanol if 3240 J was needed to raise the temperature of the ethanol
Answer:
30.405°CExplanation:
Using the formula for heart capacity;
Q = mcΔt
m is the mass = 150g = 0.15kg
initial temperature = 22°C
Quantity of heat = 3240J = 3.24kJ
specific heat capacity of ethanol = 2.57 [kJ/kg K]
Substitute and get the final temperature
3.240 = 0.15(2.57)(T - 22)
3.240 = 0.3855(T-22)
3.240/0.3855 = T - 22
8.405 = T - 22
T = 22+8.405
T = 30.405°C
Hence the final temperature of the ethanol if 3240 J was needed to raise the temperature of the ethanol is 30.405°C
3. A ball is hit upward with a speed of 7.5 m/s. How long does the ball take to reach maximum height?
Answer:
t = 0.75 seconds
Explanation:
Given that,
The initial speed of a ball, u = 7.5 m/s
We need to find the time taken by the ball to reach the maximum height. Let t is the time taken.
At maximum height, its final speed, v = 0 and it will move under the action of gravity.
Using the equation of motion to find t.
[tex]v=u+at[/tex]
Use a = -g
[tex]v=u-gt\\\\t=\dfrac{u}{g}\\\\t=\dfrac{7.5}{10}\\\\t=0.75\ s[/tex]
Hence, the ball will take 0.75 seconds to reach the maximum height.
Which option is an element?
A. Carbon dioxide
B. Carbon
C. Air
D. Water
Which characteristic of a sound is affected by the amount of energy used to create that sound? In what direction the sound will travel how fast or slow the sound travels in a particular medium how high or low the sound's pitch is how loud or soft the sound is
Answer:
The correct option is;
How loud or soft the sound is
Explanation:
The loudness of a sound wave is given by the amount of energy that the pressure wave carries and it is measured in decibels (dB) which is the relative intensity of the pressure wave of a sound to the standard pressure
A loud sound has a high amplitude and a soft sound has a low amplitude, such that as the amplitude of the sound is increased, due to increased energy input, the sound becomes louder, and as the amplitude of the sound is decreased due to reduced energy input, the sound becomes softer.
an object has a weight on the surface of the earth of 370 N. What is the mass
Explanation:
The mass of the object is 370N / (9.81N/kg) = 37.7kg.
Hi can you help me with this please?
An eagle , initially at rest on the ground , lifts off vertically with a constant acceleration of 25 meters per square second . How long will it take the eagle to reach an altitude of 100 meters ?
Answer:
4s
Explanation:
My assumption would be 4s since 25 going into 100 would be 4? hope that helped..
A car starting from rest accelerated at the rate of 0.5 m/s². What would be the final velociety of the car and how much time would it take to cover 1.6kms?
Answer:
1) 800m/s
2) 2 seconds
Explanation:
Acceleration= velocity/time
Where acceleration= 0.5 m/s²
Time= 1.6kms= 1.6×10^3 seconds
If we substitute we have
0.5=v/(1.6×10^3)
V=800m/s
the final velociety of the car is 800m/s
Velocity= distance/time
800= (1.6×10^3)/ time
Time= 1.6×10^3/800
=2 seconds
Hence the time it will take to cover is 2seconds
Dua titik yang bermuatan listrik yang sama, mula-mula berjarak 5 cm dan saling tarik menarik dengan gaya 225 N. Agar kedua titik muatan tersebut gaya tarik menariknya menjadi 25 N, maka seharusnya jarak kedua titik muatan itu menjadi….
Answer:
15 cm
Explanation:
Dari pertanyaan yang diberikan di atas, diperoleh data sebagai berikut:
Gaya 1 (F₁) = 225 N
Jarak terpisah 1 (d) = 5 cm
Gaya 2 (F₂) = 25 N
Jarak terpisah 2 (d₂) =?
Kita dapat memperoleh persamaan yang berkaitan dengan gaya dan jarak muatan dua titik dengan menggunakan rumus berikut:
F = Kq₁q₂ / d²
Perbanyak silang
Fd² = Kq₁q₂
Menjaga Kq₁q₂ konstan, kita memiliki:
F₁d₁² = F₂d₂²
Dengan rumus di atas maka diperoleh jarak sebagai berikut:
Gaya 1 (F₁) = 225 N
Jarak terpisah 1 (d) = 5 cm
Gaya 2 (F₂) = 25 N
Jarak terpisah 2 (d₂) =?
F₁d₁² = F₂d₂²
225 × 5² = 25 × d₂²
225 × 25 = 25 × d₂²
5625 = 25 × d₂²
Bagilah kedua sisinya dengan 25
d₂² = 5625/25
d₂² = 225
Hitung akar kuadrat dari kedua sisi
d₂ = √225
d₂ = 15 cm
Oleh karena itu, muatan dua titik harus berjarak 15 cm untuk memiliki gaya tarik 25 N
why it is difficult to run fast in sand
Explanation:
The force exerted by our foot on the sand is less because time taken is large so it is difficult to run fast on sand.
hope it will help you
A 0.05 kg golf ball at rest was hit with a force of 200N. The golf ball left the club at an angle of 35° to the horizontal at 49m/s. What was the final velocity as it hits the ground
Note that when the ball is in the air, the only force acting on it is the downward pull of gravity, so the force of the swing is a red herring.
The ball hits the ground at the same height from which it was hit, so its final velocity will have the same magnitude of 49 m/s, but pointing at an angle of 35° below the horizontal.
The Hawaiian islands formed when molten material erupted from the ocean floor. As the lava flowed out, cooled, and hardened, massive rocks formed. These rocks have a very fine texture and tiny crystals that cannot be seen with the naked eye. These massive rocks formed into the islands that are present today.
What type of igneous rock are the Hawaiian islands?
Answer:
Explanation:
The most common type of igneous rock making up the Hawaiian island chain is Mafic rock. Furthermore, the most common type of Mafic rock is basalt.
Answer:
Extrusive
which eletromagnetic waves have the lowest frequency radio waves micro waves x rays or gamma rays
Answer: Radio waves have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation. In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.
Explanation:
What is the mass of 2.5 moles of carbon?
A-1.5 x 1024 g C
B-30 g C
C-2.5 g C
D-0.21 g C
Answer:
I think no B
if wrong correct me plsssssss
Mark me brainliest
have a nice day
I will always help you understanding your assingments
#Captainpower:)
A 0.3 kg bird flies south with a speed of 5 m/s. What is its kinetic energy?
A. 1.5 J
B. 2.5 J
C. 3.8 J
D. 8.3 J
Answer:
right answer is number C that is 3.8J since KE=1/2mv²
if a quarterback applies a 100N force on a football for a distance of .5m, how much work does he do on the ball
PLEASE HELP
Explanation:
Work done = F * d = 100N * 0.5m = 50J.
What is the kinetic energy of a 2000 kg car that is traveling 10 m/s
Answer:
100,000 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 2000 \times {10}^{2} \\ = 1000 \times 100 \\ = 100000[/tex]
We have the final answer as
100,000 JHope this helps you
Which visible quality of smoke shows that it contains a
lot of gas influencing the other particles?
O The shade of the color is different in different places.
O Smoke usually has an unpleasant smell.
O Smoke rises out of very hot substances.
O The shape of the smoke changes very easily.
Answer:
C: Smoke rises out of very hot substances
Explanation:
Edge
Answer:
It's D.
Explanation:
A man does 40,000 J of work in 20 seconds. How much power does he exert?
Explanation:
Since P=W/t
P= 40000/20
P= 2000 Watt(or)Joule per sec
If a Ferrari, with an initial velocity of 10 m/s, accelerates at a rate of 5 m/s2 for 3 seconds, what will its final velocity be?
Answer:
25 m/s
Explanation:
Formula of acceleration is:
[tex]a=\frac{v-u}{t} \\[/tex]
where,
v is the final velocity
u is the initial velocity
a is the acceleration and
t is the time
so plugging in the values we get,
[tex]a=\frac{v-u}{t} \\\\5=\frac{v-10}{3} \\\\15=v-10\\15+10=v\\v=25\ m/s\\[/tex]
_____ is the force of attraction between objects that have mass.
A balloon tied up with a wooden piece is moving upward with velocity of 15m/s. At a height of 300m above the ground, the wooden block detached from the balloon. How much time will it take to reach the ground?
a_______ is a region where the magnetic fields of a large number of atoms are lined up parallel to a magnets field.
Answer:
Magnetic Domain
Explanation:
A man is standing on the edge of a 20.0 m high cliff. He throws a rock horizontally with an initial velocity of 10.0 m/s. How long does it take to reach the ground? How far does the rock land from the base of the cliff?
Answer:
d = 20.2 m
t = 2.02 s
Explanation:
Horizontal Motion
When an object is thrown horizontally with a speed v from a height h, it describes a curved path ruled by gravity until it hits the ground.
To calculate the time the object takes to hit the ground, we use the equation:
[tex]\displaystyle t=\sqrt{\frac{2h}{g}}[/tex]
Note the time does not depend on the initial speed.
The range or maximum horizontal distance traveled by the object can be calculated as follows:
[tex]\displaystyle d=v.t[/tex]
The man standing on the edge of the h=20 m cliff throws a rock with a horizontal speed of v=10 m/s.
The time taken by the rock to reach the ground is:
[tex]\displaystyle t=\sqrt{\frac{2*20}{9.8}}[/tex]
[tex]\displaystyle t=\sqrt{4.0816}[/tex]
t = 2.02 s
Now for the horizontal range:
[tex]\displaystyle d=10\cdot 2.02[/tex]
d = 20.2 m
HELP ASAP!!!!!!! PLEASE WILL GIVE BRAINLIEST
Define organelles and explain their general function in a cell
Answer:
They carry out essential functions that are necessary for the survival of cells – harvesting energy, making new proteins, getting rid of waste. Hope this helps!
Explanation:
I organelles is a specialized subunits with a specific cell, their general function is to store genetic information
Efficiency is a measure of how much of the work put into a machine is converted into useful output work. Why can efficiency never reach 100%?
A) Acceleration
B) Elasticity
C) Friction
D) Gravity
Answer:
C , Friction
Explanation:
How much work is it to lift a 2.0 kg sack of potatoes vertically 6.5 m?
Answer:
Therefore, the work done to lift a 20 kg sack of potatoes of potatoes vertically 6.5 m is 1, 274 J.
In object moving with a speed of 21M/S and has a kinetic energy of 140j, what is thr mass of the object
