Answers
Answer:
In picture one because string telephones are best heard when there is more tension on the string
Explanation:
Related Questions
. A falling rubber ball of mass 0.025 kg strikes the ground traveling straight down at 4.0 m/s. Find the magnitude of the impulse that the ground gives to the ball if
a) the ground is soft and the ball stops dead
b) the ground is hard and the ball bounces straight back at 2.0 m/s.
Answers
Given that,
Mass of the ball, m = 0.025 kg
Initial speed, u = 4 m/s
To find,
Impulse when (a) the ground is soft and the ball stops dead
(b) the ground is hard and the ball bounces straight back at 2.0 m/s.
Solution,
Impulse = change in momentum
J = m(v-u)
(a) u = 0 (as it stops)
J = 0.025(4-0)
J = 0.1 N-m
(b) v = 2 m/s
J = 0.025(4-2)
= 0.05 N-m
Therefore, this is the required solution.
(6)
A 100 W heater is connected to a 240 V mains supply. Calculate the:
current drawn;
resistance of the hheater.I want to know how to go about it
Answers
Answer:
Current drawn = 0.417 A (rounded to 3 significant figures)
Resistance = 576Ω (rounded to 3 significant figures)
Explanation:
Current = Power ÷ Voltage
Current = 100W / 240V
∴ Current = 0.416666666.... = 0.417A
Resistance = Voltage ÷ Current
Resistance = 240 ÷ 0.417
∴ Resistance = 575.539 = 576Ω
A bowling ball hits two standing bowling pins at the same time. Which of the following is true? Assume that all collisions are elastic. A. The sum of the momentum of both pins after the collision will equal the momentum of the ball before the collision. B. The momentum of the ball after the collision will equal the momentum of the ball before the collision. C. The sum of the momentum gained by both pins will equal the amount of momentum lost by the ball. D. The momentum of each pin after the collision will equal the momentum of the ball before the collision.
Answers
Answer:
C. The sum of the momentum gained by both pins will equal the amount of momentum lost by the ball.
Explanation:
The law of conservation of momentum states that total momentum before collision must be equal to the total momentum after collision.
Momentum could be transferred from one object to another during collision. When the ball hits the stationary pins, momentum is transferred from the ball to the pins.
Since the collision is elastic, momentum is conserved hence total momentum gained by the pins equals the total momentum lost by the ball.
“DNA...”
1: has a structure of a cone.
2:cannot be repaired if it is mutated.
3:is made up of nucleotides.
4:is made up of amino acids.
< Previous
Answers
Answer:
3. is made of nucleotides
what are conductors and insulators? Give at least five example of each
Answers
Answer: conductors are substances that allow heat or electricity to pass through . It deals with only the flow of electrons.
Eg. water, copper wire, iron rod, some ceramic materials, metallic nail.
Insulators are materials that do not allow heat or electricity to pass through.
Eg. Book, plastic, rubber, glass, paper
Explanation:
A truck pushes a pile of dirt horizontally on a frictionless road with a net force of 20\, \text N20N20, start text, N, end text for 15.0\,\text m15.0m15, point, 0, start text, m, end text. How much kinetic energy does the dirt gain
Answers
Answer:
300 Nm ; 300 J
Explanation:
Given that:
Force (F) = 20 N
Distance (d) = 15 m
The kinetic energy (Workdone) = Force * Distance
Kinetic Energy = 20N * 15m
Kinetic Energy = 300Nm
K. E = 1/2
Answer:
77.0k/M
Explanation:
T/F: Stars die.
True
False
Answers
Answer:
The answer is true
Explanation:
could you brainliest again they said I plagarized when I didn't
Which of the following is true about a field goal?
A shot from half court.
It is worth two points.
It is shot from behind the 3-point line.
It is a free shot given when a player is fouled.
Answers
Answer:
which sport are you referring to?
Explanation:
Paola conducts an investigation to determine how temperature affects plant growth. Each plant started at the same height, received the same amount of water and was planted in the same type of soil She
recorded her results every seven days for three weeks.
Pls help
Answers
Answer:
HE IS WON
Explanation:
JESUS
state two uses of total internal reflection
Answers
Answer:
The phenomenon of total internal reflection of light is used in many optical instruments like telescopes, microscopes, binoculars, spectroscopes, periscopes
In Requiem for a Dream, the DP uses a device that straps the camera to the actor's chest to achieve a very subjective shot. What is this apparatus called
Answers
Answer:
A snorricam
Explanation:
The apparatus used here is a snorricam. A snorricam can be described to be a camera device which is used during the making of films. The snorricam is rigged to the actor. It faces him or her directly in such a way that as they walk, they would not appear to make any movements but the things around them would. It is also called the bodymount camera.
At a certain distance from the center of the Earth, a 0.4-kg object has a weight of 2.0 N. (a) Find this distance. (b) If the object is released at this location and allowed to fall toward the Earth, what is its initial acceleration
Answers
Answer:
a) The distance of the object from the center of the Earth is 8.92x10⁶ m.
b) The initial acceleration of the object is 5 m/s².
Explanation:
a) The distance can be found using the equation of gravitational force:
[tex]F = \frac{GMm}{r^{2}}[/tex]
Where:
G: is the gravitational constant = 6.67x10⁻¹¹ Nm²/kg²
M: is the Earth's mass = 5.97x10²⁴ kg
m: is the object's mass = 0.4 kg
F: is the force or the weight = 2.0 N
r: is the distance =?
The distance is:
[tex]r = \sqrt{\frac{GMm}{F}} = \sqrt{\frac{6.67 \cdot 10^{-11} Nm^{2}/kg^{2}*5.97 \cdot 10^{24} kg*0.4 kg}{2.0 N}} = 8.92 \cdot 10^{6} m[/tex]
Hence, the distance of the object from the center of the Earth is 8.92x10⁶ m.
b) The initial acceleration of the object can be calculated knowing the weight:
[tex] W = ma [/tex]
Where:
W: is the weight = 2 N
a: is the initial acceleration =?
[tex] a = \frac{W}{m} = \frac{2 N}{0.4 kg} = 5 m/s^{2} [/tex]
Therefore, the initial acceleration of the object is 5 m/s².
I hope it helps you!
"When the ball leaves the ramp at Point B, students measure the horizontal" distance traveled. They repeat the experiment five times, being careful to release the ball from the same starting Point A and find the average horizontal distance traveled to be 2.0 m. One student suggests they use a stopwatch to find the time the ball is in the air whereas another student suggests they use a meter stick. Given these materials, describe the procedure students should follow to minimize error and calculate the speed of the ball as it leaves the ramp.
Answers
Answer:
Speed of ball as it leaves ramp is 2 m/s
Explanation:
From the question it is given that the average distance traveled by ball from point A to B is 2.0 m and the time taken is 1sec
one student is using stopwatch to calculate the time taken by ball and another student is using meter stick to calculate the distance traveled
since speed of ball is given by v = [tex]\frac{distance}{time}[/tex] thus,
the speed = 2 m/s
now for minimizing the error of speed it is necessary to record the readings by single students at-least 5 times and take average
by doing this, the error of speed calculation will be minimum as the it decreases the error due to random error of system caused by taking the reading by different students
A laser beam, shining from the earth's surface, is directed at the moon whose distance from the earth on this day is 370,000 km. If the beam diverges at an angle of only 1.65 x 10-5 rad, what diameter circle will it make on the moon
Answers
Answer:
d = 6105 m
Explanation:
For this exercise we must use trigonometry to find the diameter of the has. The most common definition in optics of the angle of divergence is measured between the two ends of the beam, therefore to use this angle in trigonometry where the angle is measured with respect to the normal we must take half of this angle
θ = 1.65 10⁻⁵ / 2 = 0.825 10⁻⁵ rad
let's use the tangent
tan θ = y / L
y = L tan θ
y = 370000 103 tan (0.825 10⁻⁵)
let's be careful since the angles are in radians
y = 3025.5 m
This is the distance from the normal that corresponds to the radius of the circle, the diameter is twice the radius
d = 2 y
d = 2 3025.5
d = 6105 m
A rock weighing 6 Newton’s is lifted 2 meters. How much work is done?
Answers
Answer:
12 Joules
Explanation:
I believe a Joule is a Newton meter, and work is represented in joules, so 6 N * 2m = 12 Nm (joules)
why iron-rims are heated before putting them on the wheels of Bullock-carts?
Answers
Answer:
Explanation:
The iron ring to be put on the rim of a cart wheel is always of slightly smaller diameter than that of the wheel. When the iron ring is heated to become red hot, it expands and slips on to the wheel easily. When it is cooled, it contracts and grips the wheel firmly.
Explanation:
Iron rims are made slightly smaller than the wheels. They are heated red hot before fixing them on the cart wheels to expand them so that they can be easily fixed on the wheels and water is poured on them to cool them. As the rims cool they contract and take the shape of the wheel and get firmly fixed on the wheels.
So iron-rims are heated before putting them on the wheels of Bullock-carts
Hope it will help :)
1. Which is not an example of vaporization?
Bubbles form as water boils on the stove.
Water droplets form on a mirror during a shower.
Air gains moisture as it moves over the ocean.
Wet pavement dries after a rain shower.
Answers
"Wet pavement dries after a rain shower" is not an example of vaporization. The correct answer is D.
What is vaporization?
Vaporization is the process by which a liquid is converted into a gas or vapor. The two main types of vaporization are boiling and evaporation.
Here in the Question,
Option A: Bubbles form as water boils on the stove. This is an example of vaporization by boiling, which occurs when a liquid is heated to its boiling point and its vapor pressure becomes equal to the atmospheric pressure.
Option B: Water droplets form on a mirror during a shower. This is an example of vaporization by evaporation, which occurs when a liquid changes into a gas at temperatures below its boiling point. In this case, the water on the mirror evaporates due to the heat and humidity in the shower.
Option C: Air gains moisture as it moves over the ocean. This is also an example of vaporization by evaporation. The warm air over the ocean absorbs moisture from the water surface, causing the water to evaporate and form water vapor in the air.
Option D: Wet pavement dries after a rain shower. This is not an example of vaporization. The water on the pavement may evaporate due to the heat and dryness of the surrounding air, but this process does not involve a liquid changing into a gas or vapor. Rather, the water on the pavement may be absorbed by the ground, run off into nearby drainage systems, or be removed by physical means like squeegees.
Therefore, among the given options, option D is not an example of vaporization.
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Assuming the density of water is 62.4 lbm/ft3, and using standard gravity, how much does 1 gallon of water weigh?
Answers
Answer:
The weight of the water is 37.14 N.
Explanation:
Given;
density of water, ρ = 62.4 lbm/ft³
volume of water, V = 1 gallon = 0.1338 ft³
The mass of the water is calculated as;
m = ρV
[tex]m = 62.4 \ \frac{lbm}{ft^3} \ \times \ 0.1338 \ ft^3\\\\m = 8.349 \ lbm[/tex]
1 lbm = 0.454 kg
8.349 lbm = ?
= 3.79 kg
The weight of the water is calculated as;
W = mg
where;
g is acceleration due to gravity = 9.8 m/s²
W = (3.79)(9.8)
W = 37.14 N.
Therefore, the weight of the water is 37.14 N.
The graph shows the amplitude of a passing wave over time in seconds (s). What is the approximate frequency of the wave shown?
A.6 Hz
B.0.3 Hz
C.0.7 Hz
D.3 Hz
Answers
Answer:
B) 0.3Hz
Explanation:
I just took the test i hope i helped and i hope you pass the test
Answer:.5
Explanation:
I took the quiz
12x+13y=12.01
x+y=2.323 times 10 to the 27 power
x= # of carbon - 12 atoms
y= # of carbon- 13 atoms
solve for x and y
Please help!!!!!
Answers
Answer:
[tex]y = - 2.7876 * 10^{28}[/tex]
[tex]x= 3.0199 * 10^{28}[/tex]
Explanation:
Given
[tex]12x+13y=12.01[/tex]
[tex]x+y=2.323 * 10^{27}[/tex]
Required:
Solve
Make x the subject in [tex]x+y=2.323 * 10^{27}[/tex]
[tex]x=2.323 * 10^{27} - y[/tex]
Substitute the above expression for y in [tex]12x+13y=12.01[/tex]
[tex]12(2.323 * 10^{27} - y) + 13y = 12.01[/tex]
Open brackets
[tex]12*2.323 * 10^{27} - 12y + 13y = 12.01[/tex]
[tex]12*2.323 * 10^{27} + y = 12.01[/tex]
Collect Like Terms
[tex]y = 12.01 - 12*2.323 * 10^{27}[/tex]
[tex]y = 12.01 - 2.7876 * 10^{28}[/tex]
12.01 is negligible compared to [tex]2.7876 * 10^{28}[/tex]
So:
[tex]y = - 2.7876 * 10^{28}[/tex]
Substitute the above expression for y in [tex]x=2.323 * 10^{27} - y[/tex]
[tex]x=2.323 * 10^{27} - (- 2.7876 * 10^{28})[/tex]
[tex]x=2.323 * 10^{27} + 2.7876 * 10^{28}[/tex]
[tex]x= 0.2323 * 10^{28} + 2.7876 * 10^{28}[/tex]
[tex]x= 3.0199 * 10^{28}[/tex]
A guitar player can change the frequency of a string by "bending" it-pushing it along a fret that is perpendicular to its length. This stretches the string, increasing its tension and its frequency. The B string on a guitar is 64 cm long and has a tension of 74 N. The guitarist pushes this string down against a fret located at the center of the string, which gives it a frequency of 494 Hz. He then bends the string, pushing with a force of 4.0 N so that it moves 8.0 mm along the fret.
* What is the new frequency?
Answers
Answer:
[tex]f'=504hz[/tex]
Explanation:
From the question we are told that
The B string on a guitar is 64 cm long
The B string tension tension of 74 N.
Frequency of 494 Hz
Pushed with a Force of 4.0 N
It moves 8.0 mm along the fret.
Generally the equation for frequency of ring under tension is mathematically given as
[tex]2Lf=\sqrt{x\frac{T}{\mu} }[/tex]
[tex]2*(64/100)*494=\sqrt{\frac{74}{m/0.64}[/tex]
[tex](632.32)^2={\frac{74}{m/0.64}[/tex]
[tex](632.32)^2=74*{\frac{0.64}{m}[/tex]
[tex](632.32)^2={\frac{47.36}{m}[/tex]
[tex]m=1.18450761*10^-^4[/tex]
Therefore finding the New frequency f'
[tex]f'=\frac{(\sqrt{\frac{74+11}{(\frac{1.18450761*10^-^4}{0.642})}})}{2*0.642}[/tex]
[tex]f'=\frac{(\sqrt{(\frac{74+11}{1})*(\frac{0.642}{1.18450761*10^-^4}})}{2*0.642}[/tex]
[tex]f'=\frac{(\sqrt{(\frac{85}{1})*(\frac{0.642}{1.18450761*10^-^4}})}{2*0.642}[/tex]
[tex]f'=\frac{(\sqrt{(\frac{54.57}{1.18450761*10^-^4}})}{2*0.642}[/tex]
[tex]f'=\frac{678.7471973}{2*0.642}[/tex]
[tex]f'=572.9111096hz[/tex]
You throw a ball into the air. Which two forces cause the ball to gradually stop moving upward and then fall back to Earth?
A.
Balanced forces
B.
Friction
C.
Normal force
D.
Gravitational force
will mark brainliest
Answers
Answer:
I'm pretty sure the answer is D
Explanation:
Honestly it's just a guess so let me know if it's right :3
Answer:
it should be A and B
Explanation:
because obviously gravity causes it to fall down and the second force acted upon it is Friction from the air and ball coming in contact with eachother. I hope this helps
What is the force of gravitational attraction between an object with a mass of 100 kg and another object that has a mass of 300 kg and are at a distance of 2m apart
Answers
Answer:
5 x 10⁻⁷N
Explanation:
Given parameters:
Mass of object 1 = 100kg
Mass of object 2 = 300kg
Distance = 2m
Unknown:
Force of gravitational attraction between the objects = ?
Solution:
From Newton's law of universal gravitation we derive an expression:
Fg = [tex]\frac{G m_{1} m_{2} }{r^{2} }[/tex]
G is the universal gravitation constant = 6.67 x 10⁻¹¹
m is the mass
r is the distance between the bodies
Now insert the parameters and solve;
Fg = 6.67 x 10⁻¹¹ x [tex]\frac{100 x 300}{2^{2} }[/tex] = 5 x 10⁻⁷N
What is her velocity?
O 1.5 m/s
O 2 m/s
O 2.5 m/s
O 5 m/s
Answers
Answer:
C. 2.5
Explanation:
It said it was right, so that's cool.
7. An outfielder throws a baseball to the first baseman at a speed of 19.6
m/s and an angle of 30° above the horizontal. If the ball in the described
situation is caught at the same height from which it was thrown, calculate
the amount of time the ball was in the air. (use -9.8 m/s2 for g in this
problem] [include the numerical answer and correct unit] *
Answers
The amount of time that the ball took in air is 1 second.
We must recall that the ball was thrown as a projectile and its time of flight must be obtained from the formula for the time of flight of a projectile as follows;
T = 2usinθ/g
u = initial velocity = 19.6 m/s
θ = angle of projection = 30°
g = acceleration due to gravity = 9.8 m/s2
Substituting values;
T = 2 × 19.6 m/s sin (30°)/9.8 m/s2
T = 1 second
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PLEASE HELP The graph shows the amplitude of a passing wave over time in seconds (s). What is the approximate frequency of the wave shown?
A.6 Hz
B.0.3 Hz
C.0.7 Hz
D.3 Hz
Answers
Answer:
[tex]F = 0.3\ Hz[/tex]
Explanation:
Given
See attachment for the graph
Required
Determine the frequency
Frequency (F) is calculated as:
[tex]F = \frac{1}{T}[/tex]
Where
T = Time to complete a period
From the attachment, the wave complete a cycle or period in 3 seconds..
So:
[tex]F = \frac{1}{3s}[/tex]
[tex]F = 0.333\ Hz[/tex]
[tex]F = 0.3\ Hz[/tex] --- Approximated
Answer:
0.3Hz
Explanation:
I took the test :)
200. newton·meters of work is put into a machine over a distance of 20. meters. The machine does 150. newton·meters of work as it lifts a load 10. meters high. What is the mechanical advantage of the machine?
Answers
Answer:
Answer:
Mechanical advantage of the machine is 1.5
Explanation:
The formula for mechanical advantage is:
MA = OutputForce/InputForce
To calculate this, we need the force of input and the force of output.
The formula to calculate the force given the work (W) and the distance (d) is:
F = W/d
Calculating the input force Fi:
Fi = 200Nm/20m = 10 N
Calculating the output force Fo:
Fo = 150Nm/10m = 15 N
Thus, the mechanical advantage MA is:
MA = 15N / 10N = 1.5
please help me i have this due tommorrow!!!
Answers
why should a rain gauge be raised 30cm above the ground
Answers
To avoid splashing, rain gauges are positioned 30 cm above the surface of the ground.
What is the reason behind a rain gauge be raised 30cm above the ground?The rainfall may be precisely measured by a rain gauge without any loss from evaporation. It is a tool for measuring the amount of precipitation that falls over a certain area. As a result, it gauges rainfall. A millimeter of measured precipitation is equal to one liter of rainfall per square meter.
Standard rain gauges have a 150–170 cm channeled aperture. They are made to be a straightforward passive collector. For measuring the amount of precipitation, use a graduated measuring glass. To avoid rainwater splashing while measuring rainfall, the rain gauze should be positioned 30 cm above the ground.
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John Purchased 6 Kg And 500 Kg of suger and 12kg and 400g of rice.what is the total mass of the suger and rice that he purchased?
Answers
Answer:
Total Mass = 18 kg 900 gram
Explanation:
Given:
Mass of sugar buy = 6 kg 500 gram
Mass of rice buy = 12 kg 400 gram
Find:
Total Mass
Computation:
Total Mass = Mass of sugar buy + Mass of rice buy
Total Mass = 6 kg 500 gram + 12 kg 400 gram
Total Mass = 18 kg 900 gram