Answer:
Explanation:
.
Why is coal considered a nonrenewable resource? Check all that apply.
Coal is burned to generate electricity.
Coal power plants give off large quantities of smoke and ash.
Coal forms so slowly that we could use up the supply that exists now.
Coal is available in limited amounts.
Answer:
cola forms so slowly that we could use up the supply that exists now
Answer: c and d
Explanation:
A circus stuntman holds himself straight out by his arms from a vertical pole. If the stuntman's center of gravity is located 0.75 m away from the pole and he weights 650 N, how much force do is arms have to apply if they exert their force upwards at 0.10 m away from the pole? [4875 N]
Answer: 4875 N
Explanation:
Given
Stuntman weight is [tex]W=650\ N[/tex]
His center of gravity is located at [tex]x=0.75\ m[/tex] away from pole
If he applies an upwards force at 0.10 m away from the pole
Suppose F is the applied force
To remain vertical, the torque of weight must be canceled by the vertical force
[tex]\Rightarrow 650\times 0.75-F\times 0.10=0\\\\\Rightarrow 650\times 0.75=F\times 0.10\\\\\Rightarrow F=\dfrac{487.5}{0.10}=4875\ N[/tex]
PLS HELP ME FAST I NEED TO DO IT NOW
I WILL GIVE YOU 45 POINT
Answer:
A) so the conditions for the expirament don’t affect the outcome
b) to make sure the results are conclusive and accurate
Explanation:
6. Calculate the pressure exerted on an elevator floor which has an
area of 6 m², if 20 people whose combined force is 1500 N are
standing on it.
Answer:
Hope this helps you out if you could please leave 5 stars or brainiest thank you
"True or False": Because action and reaction forces are equal in magnitude, they will produce the same acceleration in both objects involved.
True. Forces that are equal in magnitude always result in the same acceleration.
True. The same acceleration will result because the two objects are acting on each other.
False. Acceleration is dependent on the mass of the object that is accelerated.
False. Even though both objects experience an equal force, only one will accelerate.
True im not 100% sure but I tried.
An arrow is shot at an angle of 35° and a velocity of 50 m/s. How long does it take to return to its original starting height?
Answer:
4.02 s
Explanation:
From the question given above, the following data were obtained:
Angle of projection (θ) = 35°
Initial velocity (u) = 50 m/s
Acceleration due to gravity (g) = 10 m/s²
Time of flight (T) =?
The time of flight of the arrow can be obtained as follow:
T = 2uSineθ / g
T = 2 × 35 × Sine 35 / 10
T = 70 × 0.5736 / 10
T = 7 × 0.5736
T = 4.02 s
Therefore, the time taken for the arrow to return is 4.02 s
A disk 7.90 cm in radius rotates at a constant rate of 1 190 rev/min about its central axis. (a) Determine its angular speed. 124.58 Correct: Your answer is correct. rad/s (b) Determine the tangential speed at a point 2.98 cm from its center. 3.71 Correct: Your answer is correct. m/s (c) Determine the radial acceleration of a point on the rim. magnitude 1.23 Correct: Your answer is correct. km/s2 direction toward the center Correct: Your answer is correct. (d) Determine the total distance a point on the rim moves in 2.06 s. 20.28 Correct: Your answer is correct. m
Answer:
[tex]124.62\ \text{rad/s}[/tex]
[tex]3.71\ \text{m/s}[/tex]
[tex]1.23\ \text{km/s}^2[/tex]
[tex]20.28\ \text{m}[/tex]
Explanation:
r = Radius of disk = 7.9 cm
N = Number of revolution per minute = 1190 rev/minute
Angular speed is given by
[tex]\omega=N\dfrac{2\pi}{60}\\\Rightarrow \omega=1190\times \dfrac{2\pi}{60}\\\Rightarrow \omega=124.62\ \text{rad/s}[/tex]
The angular speed is [tex]124.62\ \text{rad/s}[/tex]
r = 2.98 cm
Tangential speed is given by
[tex]v=r\omega\\\Rightarrow v=2.98\times 10^{-2}\times 124.62\\\Rightarrow v=3.71\ \text{m/s}[/tex]
Tangential speed at the required point is [tex]3.71\ \text{m/s}[/tex]
Radial acceleration is given by
[tex]a=\omega^2r\\\Rightarrow a=124.62^2\times 7.9\times 10^{-2}\\\Rightarrow a=1226.88\approx 1.23\ \text{km/s}^2[/tex]
The radial acceleration is [tex]1.23\ \text{km/s}^2[/tex].
t = Time = 2.06 s
Distance traveled is given by
[tex]d=vt\\\Rightarrow d=\omega rt\\\Rightarrow d=124.62\times 7.9\times 10^{-2}\times 2.06\\\Rightarrow d=20.28\ \text{m}[/tex]
The total distance a point on the rim moves in the required time is [tex]20.28\ \text{m}[/tex].
How do scientists use patterns?
A. To organize results
B. To describe how something is made
C. To predict what might happen next
D. To send messages to other scientists
Answer:
c because you see with your eyes and c rhymes with eyes
A what is a chemical secreted by your glands that regulates the activities of different body cells.
The chemical secreted by glands that regulates the activities of different body cells is HORMONE.
In a tropic level, energy flows from the producer to the primary consumer and to a secondary consumer. True False
Answer:
True
Explanation:
This is true because in an energy flow, the primary producers such as plants produce their own foods by using energy from the sun. These primary producers are consumed by primary consumers such as rabbits for food, while secondary consumers such as snakes would consume the primary consumers.
By so doing, energy flows from one trophic level to the other.
A car drives 30 m north in 1.5 seconds and drives 60 east in 2 seconds. What is the average velocity
Answer:
19.2 m/s
Explanation:
From the question,
Velocity = displacement/time = d/t
V = d/t.................................. Equation 1
Average velocity = Total displacement/ total time
Total dispalcement = √(30²+60²) = √4500 = 67.08 m
Total time = 1.5+2 = 3.5 s.
Substitute these value into equation 1
V = 67.08/3.5
V = 19.2 m/s.
Hence the average velocity is 19.2 m/s
The parameter given for the car during transit is 30 m north in 1.5 seconds and drives 60 east in 2 seconds, we want to find the average velocity.
average velocity is 19.2 m/s
Solution
The expression for Average velocity is
Average velocity = Total Displacement/ Total time Taken...............Eqn 1
Total Displacement = √(30²+60²) = √4500 = 67.08 m
Total time = 1.5+2 = 3.5 s.
From the Equation 1
Average Velocity = 67.08/3.5
V = 19.2 m/s.
Therefore, the average velocity is 19.2 m/s
Learn more about average velocity :
https://brainly.com/question/24739297
How bones do humans have ??
Answer:
206
Explanation:
The axial skeleton, comprising the spine, chest and head, contains 80 bones. The appendicular skeleton, comprising the arms and legs, including the shoulder and pelvic girdles, contains 126 bones, bringing the total for the entire skeleton to 206 bones.
A fully grown adult features 26 bones in the spine, whereas a child can have 34.
Answer:
The human body is made up of 206 bones
Please help Solve! I need help!
Question:
Jermaine runs exactly 2 laps around a 400-meter track. What is the displacement?
Multiple choice answers (I need help I don't understand I don't know what the answer is PLEASE HELP ME):
a. 200
b. 800
c. 400
d. 0
D
Explanation
Given,
Distance covered in 1 lap = 400m
= Distance covered in 2 laps = 400 × 2
=800m
If Jermaine runs 2 whole laps, she comes back to her starting point.
So the answer is 0m
Hola!!!
what is meant by Multiverse???
.
.
.
.
.
.
.
anyone here??
Explanation:
group of multiple universes
these universes comprise everything that exists: the entirety of space, time, matter, energy, information, and the physical laws and constants that describe them.
Which statement correctly describes the relationship between air temperature and air pressure?
-Warm air rises, creating an area of low pressure.
-Cool air sinks, creating an area of low pressure.
-Warm air sinks, creating an area of low pressure.
-Cool air rises, creating an area of low pressure.
What happens to the force between two charges when each charge is doubled and the distance between them is 1/4 its original
magnitude?
Answer:
F' = 64 F
Explanation:
The electric force between charges is given by :
[tex]F=\dfrac{kq_1q_2}{r^2}[/tex]
Where
q₁ and q₂ are charges
r is the distance between charges
When each charge is doubled and the distance between them is 1/4 its original magnitude such that,
q₁' = 2q₁, q₂' = 2q₂ and r' = (r/4)
New force,
[tex]F'=\dfrac{kq_1'q_2'}{r'^2}[/tex]
Apply new values,
[tex]F'=\dfrac{k\times 2q_1\times 2q_2}{(\dfrac{r}{4})^2}\\\\=\dfrac{k\times 4q_1q_2}{\dfrac{r^2}{16}}\\\\=64\times \dfrac{kq_1q_2}{r^2}\\\\=64F[/tex]
So, the new force becomes 64 times the initial force.
Doubling the loudness of a sound wave requires the intensity to
by a factor of
A) increase, two
B)
decrease, two
C
increase, ten
D
decrease, ten
Answer: C. Increase, ten
Explanation: A doubling of the sensed volume (loudness) is equivalent to a level change approximately between 6 dB and 10 dB.
what is the total energy a 60W incandescent light bulb in KWh will consume in 336 hours?
(60 W) x (336 hrs) = 20,160 W-hr
That's 20.16 KWh .
In what way are all sound waves and light waves similar?
Answer:
Sound and light are similar in that both are forms of energy that travel in waves. They both have properties of wavelength, freqency and amplitude. Here are some differences: Sound can only travel through a medium (substance) while light can travel through empty space.
Answer:
Sound and light are similar in that both are forms of energy that travel in waves. They both have properties of wavelength, freqency and amplitude. Here are some differences: Sound can only travel through a medium (substance) while light can travel through empty space.
Explanation:
Hope this helped Mark BRAINLEST
how can you show that an electric current has a magnet affect
Answer:
It is observed that when a compass is brought near a current carrying conductor the needle of compass gets deflected because of flow of electricity. This shows that electric current produces a magnetic effect.
Compare the concepts of mass and weight. Name three differences.
Answer:
1a)Mass is the amount of matter in the body.
1b)Weight is the measure of the amount of force acting on a mass due to acceleration and gravity.
2a)Mass can never be zero
2b)Weight can be zero if no gravity acts upon an object. like in space
3a) Mass does not change according to location.
3b)Weight varies according to location.
Una varilla efectúa 120 vibraciones durante un minuto. Hallar el período y la frecuencia del movimiento
Cynthia forgot to put the fabric softener in the wash. As her socks tumbled in the dryer, they became charged. If a small piece of lint with a charge of +1.25 E - 10 C is attracted to the socks by a force of 3.0 E - 6 N, what is the magnitude of the electric field at this location?
Answer:
E = 24000 N/C = 24 KN/C
Explanation:
The electric field experienced by a test charge is given by the following formula:
[tex]E = \frac{F}{q}\\\\[/tex]
where,
E = Electric Field = ?
F = Force of attraction = 3 x 10⁻⁶ N
q = Charge on piece of lint = 1.25 x 10⁻¹⁰ C
Therefore, using these values in the equation, we get:
[tex]E = \frac{3\ x\ 10^{-6}\ N}{1.25\ x\ ^{-10}\ C}\\\\[/tex]
E = 24000 N/C = 24 KN/C
Anything that is thrown or shot through the air is called a projectile. A baseball
player in the outfield throws a ball to home plate. What type of path does the projectile follow?
F. a straight line
G. a curved path upwards
H. a curved path downwards
J. a straight line downwards
Answer:
A curve path downwards
Explanation:
When the ball is thrown, it curves downwards because the earth's core is pulling it out of the sky, and alse becasue the earth is round.
Answer:
H. a curved path downwards
Explanation:
A uniform electric field exists in a region between two oppositely charged plates. An electron is released from rest at the surface of the negatively charged plate and strikes the surface of the opposite plate, 2.0 cm away, in a time 1.5 x 10-8 s. The speed of the electron in millions m/sec as it strikes the second plate is: A. 13.3 B. 133 C. 2.67 D. 26.7 E. 534
Answer:
A. 13.3
Explanation:
First, we find the velocity of the electron in meters/sec, as follows:
[tex]v = \frac{d}{t}\\[/tex]
v = velocity of electron = ?
d = distance between plates = 2 cm = 0.02 m
t = time elapsed = 1.5 x 10⁻⁸ s
Therefore, using these values in the equation, we get:
[tex]v = \frac{0.02\ m}{1.5\ x\ 10^{-8}\ s}\\\\v = 1333333.33\ m/s[/tex]
Now, we convert this to million m/s:
[tex]v = (1333333.33\ m/s)\frac{1\ million\ m}{100000\ m}\\\\v =13.3\ million\ m/s[/tex]
Therefore, the correct answer is:
A. 13.3
Which best describes the runners? Garreth and Elisa ran the same distance but not the same displacement, Luigi and Jasmine went the same displacement, and Logan ran faster than Jasmine. Garreth ran farther than Luigi, Elisa and Jasmine went the same distance, and Logan and Jasmine has the same displacement in the opposite direction. Garreth and Elisa ran together, Luigi and Jasmine went the same distance, and Logan and Jasmine have the same displacement in the opposite direction. Garreth ran less than Logan, Elisa and Jasmine went the same displacement, and Luigi and Garreth ran together.
Answer:
The anwser is C, Garreth and Elisa ran together, Luigi and Jasmine went the same distance, and Logan and Jasmine have the same displacement in the opposite direction.
Explanation:
i just took the test and got 100%
Answer:
C or Garreth and Elisa ran together, Luigi and Jasmine went the same distance, and Logan and Jasmine have the same displacement in the opposite direction.
Explanation:
26. How many covalent bonds does water have?
a.1 b.2 c.3 d.4 e.5
Answer:
(b) 2
Explanation:
What causes the pressure in a fluid
Answer:
The pressure in a liquid is due to the weight of the column of water above. Since the particles in a liquid are tightly packed, this pressure acts in all directions. For example, the pressure acting on a dam at the bottom of a reservoir is greater than the pressure acting near the top.
Answer:
Fluid pressure can be caused by gravity, acceleration, or forces in a closed container. Since a fluid has no definite shape, its pressure applies in all directions.
Explanation:
The public is not yet able to purchase cars powered by hydrogen fuel cells because engineers have to determine how
the cars perform based on which scenario?
O on racetracks
O in real-world conditions
O in flooded environments
O on closed courses
Next
Submit
Save and Exit
return
Answer:
B on EDGE
Explanation:
If a microwave oven is rated at 2400 watts and it is connected at a 120 volt
outlet, how much current does it use?
A. 2280 amps
B. 0.05 amps
C. 20 amps
D. 288,000 amps
Please answer this ASAP
Answer:
c. 20 amps.
just divide the watts by the volts