Answer:
the acceleration due to gravity, g is zero (0)
the time of the motion is 0.2 s
Explanation:
Given;
initial velocity of the student, u = 15 m/s
distance traveled by the student, x = 3 m
The motion of the student is directed towards the horizontal and the acceleration due to gravity, g is zero (0).
The time of the motion is calculated as;
x = ut + ¹/₂gt²
x = ut + ¹/₂(0)t²
x = ut
t = x/u
t = 3 / 15
t = 0.2 s
Therefore, the time of the motion is 0.2 s
If the speed of the wave along the rope is 3.2 m/s. Calculate the frequency of the wave
Answer:
2Hz
Explanation:
Find the diagram attached
Using the formula;
v = fλ
v is the velocity
f is the frequency
λ is the wavelength
Given the following
v = 3.2m/s
λ = 4.8/3 = 1.6m
Get the frequency
f = v/λ
f = 3.2/1.6
f = 2Hertz
Hence the frequency of the wave is 2Hz
The frequency of the wave is equal to 2.0 Hertz.
Given the following data:
Speed of wave = 3.2 m/s. Distance = 4.8 meters.To calculate the frequency of the wave:
How to calculate frequency.First of all, we would determine the wavelength of the wave in the image attached below:
Note: Wavelength is the successive distance between two (2) crests.
[tex]Wavelength = \frac{distance}{3} \\\\Wavelength = \frac{4.8}{3}[/tex]
Wavelength = 1.6 meter.
Mathematically, frequency is given by this formula:
[tex]Frequency = \frac{velocity}{wavelength} \\\\[/tex]
Substituting the given parameters into the formula, we have;
[tex]Frequency = \frac{3.2}{1.6}[/tex]
Frequency = 2.0 Hertz.
Read more on frequency here: https://brainly.com/question/25699025
3
A car travels 100 km. The highest speed of the car is 90 km/h, and the lowest speed is
30 km/h. The journey takes two hours.
What is the average speed for the journey?
30 km/h
С
A
50 km/h
D 90 km/h
B
60 km/h
Answer:
60
Explanation:
90+30=120:2=60km/h
The moon orbits the earth once every 27 days at a distance of 384400 km. The international space station orbits the earth at an altitude of 400km. Determine the period of orbit of the space station
Answer:
ive never done this befor but i think its 36 times aroud earth a day
Explanation:
384400/400=961
961% of 27 days is 40minuets
1440/40=36
3. What is the frequency of a wave that has a wave speed of 20 m/s and a wavelength of 0.50 m?
Explanation:
everything can be found in the picture
if the car travels thrice(3times) around the track,who much is the total distance covered?
Two speakers create identical 288 Hz sound waves. A person is 1.47 m from Speaker 1. What is the minimum distance to Speaker 2 for there to be constructive interference at that spot?
Answer:
2.90 meters
Explanation:
Distance of speaker 2 =?
Distance of speaker 1 = 1.47m
Velocity = 343
f = 240Hz
For constructive interference to occur:
Difference in distance or path = wavelength
For minimum distance, n = 1
Distance 2 - distance 1 = nλ
Recall λ = v/f
V = Velocity ; f = frequency
Distance 2 - distance 1 = v/f
Distance 2 - 1.47 = (343/240)
Distance 2 = 1.429 + 1.47
Distance 2 = 2.899 meters
Minimum Distance of speaker 2 for their to be constructive interference = 2.90meters
Answer: 0.280
Explanation: trust.
for factors that affect capillarity
Two sound waves (speed 343 m/s) have different wavelengths. The first has a wavelength of 5.72 m, and the second a wavelength of 11.44 m. What beat frequency do you hear from these two waves?
Answer:
The beat frequency is 30 Hz
Explanation:
Given;
velocity of the two sound waves, v = 343 m/s
wavelength of the first wave, λ₁ = 5.72 m
wavelength of the second wave, λ₂ = 11.44 m
The frequency of the first wave is calculated as follows;
F₁ = v/λ₁
F₁ = 343 / 5.72
F₁ = 59.97 HZ
The frequency of the second wave is calculated as follows;
F₂ = v/λ₂
F₂ = 343 / 11.44
F₂ = 29.98 Hz
The beat frequency is calculated as;
Fb = F₁ - F₂
Fb = 59.97 HZ - 29.98 Hz
Fb = 30 Hz
1.1 A book lies on a table. This book is not moving because:
A there are no forces acting on this book.
B the forces acting on the book are in equilibrium.
C the force that the table exerts on the book is greater than the force
that the Earth exerts on the book.
D the force that the book exerts on the Earth has the same magnitude
as the force that the Earth exerts on the book and therefore they
cancel.
Answer:
B The forces acting on the book are in equilibrium
Explanation:
The book that lies on the table and does not move according to Newton's First Law of motion, because there are no net forces acting on it, therefore the net force (the sum of forces acting on the book) is zero
Therefore, the magnitude of the forces acting on the book and the direction in which the forces acts on the balance each other such that the book is in an equilibrium state because the forces acting on the book (which can cause the book to move) are in equilibrium
Therefore, the book is not moving because the forces on the book are in equilibrium.
(4) 10 m/s
13. An object, travelling along a straight path, covers 35 m distance in 4 seconds. In next 6
seconds, it covers 50 m distance. What is the average speed of the object?
(1) 3.5 m/s
(2) 4.5 m/s
(3) 7.5 m/s
(4) 8.5 m/s
14. A taxi driver noted reading on the odometer fitted in
Answer:
13
Explanation:
6+4=10s
50+35=85
av speed=85/10=8.5m/s
What is coring. In science
Answer:
Coring is a defect in an alloy (e.g., a copper nickel alloy) that occurs when a heated alloy is cooled too fast for diffusion to occur.
Explanation:
explain how a roller coaster functions using gravity and momentum. Why does it not need an engine or a motor to speed it up and slow it down?
Answer:
because it will help it go and funcion more
Explanation:
Answer:
It uses graivity and momentum because since we all know, gravity pulls things down, they have a chaint hat lifts the carts up, and then when it gets to a top, it releases it. When it goes down very high, it will go faster. Then it uses momentum when it goes up, then down again, or a loop to regain speed. IT doesn't need a engine or a motor to speed it up or slow it down because gravity and momentum is already doing the job a engine could. Like I said, when it is high in the sky and released, it goes down in incredible speed. And when it needs more speed to keep the ride going, it can add a loop or tight turns to increase it more.
What would the overall resistance be in a series circuit if there's an unknown R, 3Ω,3Ω and a current of 2A?
Answer:
R + 6 ohms
Explanation:
The current is the same in all three resistors
i = 2 amps
The problem is that the total voltage is unknown.
R = r
R1 =3 ohms
R2 = 3 ohms
The voltage drop is E = I*R
I = 2 amps
R1 = 3 ohms
R1 = 3 ohms
E = 3*2 = 6 volts
The second 3 ohm resistor also has 6 volts across it.
The total is 12 volts so far. But we know nothing more on how to solve for R.
All you can say is that the total resistance = R + 6 ohms
Una viga de acero tiene 5 m de largo a una temperatura de 20 c en un dia caluroso, la temperatura se eleva a 40 c ¿cual es el cambio en la longitud de la viga debido a la expansión térmica?
Answer:
ΔL = 1.2 10⁻³ m
Explanation:
The expression for thermal expansion is
ΔL = α L₀ ΔT
in this case it indicates that the length is L₀ = 5 m for T₀ = 20C the final temperature is T_f = 40 C
the table shows the value of thermal expansion for steel α = 12 10⁻⁶ C⁻¹
let's calculate
ΔL = 12 10⁻⁶ 5 (40 -20)
ΔL = 1.2 10⁻³ m
According to Ohm's law, determine the experimental
current for these values in Table A.
voltage = 5 V, resistance = 20 Q: f
voltage = 20 V, resistance = 20 N:
A
voltage = 50 V, resistance = 20 Q:
A
x A
A
Explanation:
using Ohm's law which is defined as V=IR
where V is the voltage, I is the current and R the resistance
Which of the following describes the image formed by a plane mirror?
virtual and erect
real and inverted
real and erect
virtual and inverted
Answer:
Virtual and erect.
An engine has an imput of 100 j and gives out 27 j of useful kenetic energy what is the efficiency of the engine
Answer:
Based on what we have learned so far, in what ways have the experiences of Asian-Canadians stayed the same over time? Why do you think these similarities exist? Please give specific examples to support your ideas.
Explanation:
Oo8. The diagram below models Mercury and Venus orbiting the sun.
Orbits of Mercury and Venus
Sun
Venus
Mercury
What forces causes Venus to travel along a curved path Instead of moving in a straight line as indicated by the dashed
line in the diagram
Answer: it is B
gravitational attraction between the sun and Venus
Explanation:
A car is traveling at 30 m/s and about to impact a wall. What change would result in the safest outcome
Answer:
Hitting the brakes
I guess....
Answer:
if he hits the brakes before it hits the wall then the safest outcome will be that he and his car will be safe.
Is the sum of kinetic and gravitational potential energy conserved in a closed system with no additional forces including gravity?
Justify that the given graph is a distance-time graph of an object at rest. (1)
2. Suppose you are going for a trip and you boarded a bus. The bus driver asked you to wear safety
belts. Will you agree with the driver and wear safety belts? Justify your answer in the light of
Newton's first law of motion. (2)
3. An object moving with a velocity of 36 km/hr changes its velocity to 72 km/hr in 20 seconds.
Find the distance travelled by the object during this time interval using only one equation of
motion
Answer:
Explanation:
Yes i will agree with the driver and wear safety belts because according to the newtons first law of motion it states that " every body continues to be in its state of rest or uniform motion in a straight line unless it is compledd by some external effort to change that state".So according to this if a bus moves our body also moves beacuse effort is applied when in the moving bus.
acceleration=final velocity - initial velocity/time taken
=(20-10 )/20
=10/20
=0.5 m/s
which of the following is a way that science and the economy interact
Answer: (A) Science is often used to make new technology that people can sell.
Explanation:
Scientific discoveries serve as a basis for industrial developments of new technologies. That development is very often driven by economical considerations. Viable, well-developed, well-implemented solutions sell.
The history of industrialized world is one treasure trove of examples of (A) (think of your iPhone X selling for $1000 a pop)
Explanation:
Cuáles son los juegos tradicionales de sonora
Answer:
soccer, football, volleyball, baseball, locress
Explanation:
hope it helps
How fast is a lightning flash?
Answer:
A lightning flash is at least 270,000 mph (434,523 kph)!
Explanation:
Have a great summer :)
Answer:
670,000,000 mph
Explanation:
The speed of lightning. While the flashes we see as a result of a lightning strike travel at the speed of light (670,000,000 mph) an actual lightning strike travels at a comparatively gentle 270,000 mph
How much power is required to light a lightbulb at 100V of voltage when the lightbulb has a resistance of 500 Ohms?
Answer:
Power = 20 Watts
Explanation:
Given the following data;
Voltage = 100 V
Resistance = 500 Ohms
To find the power that is required to light a lightbulb;
Mathematically, power can be calculated using the formula;
[tex] Power = \frac {Voltage^{2}}{resistance} [/tex]
Substituting into the formula, we have;
[tex] Power = \frac {100^{2}}{500} [/tex]
[tex] Power = \frac {10000}{500} [/tex]
Power = 20 Watts
Un objeto de 200 gramos está amarrado del extremo de una cuerda y gira describiendo un círculo horizontal de 1.20 m de radio a razón de 3 rev/seg la tensión en la cuerda es?
Answer:
La tensión es 85.3 N.
Explanation:
Cuando el objeto gira en dirección horizontal, la sumatoria de fuerzas se puede calcular usando la segunda ley de Newton:
[tex] \Sigma F_{x} =ma_{c} [/tex]
[tex] T = ma_{c} [/tex]
Dado que el movimiento es horizontal, el peso (que está en el eje y) no contribuye en la sumatoria de fuerzas en el eje x. Por lo que la única fuerza actuando sobre el objeto en la dirección del movimiento es la tensión.
En donde:
m: es la masa del objeto = 200 g = 0.200 kg
[tex]a_{c}[/tex]: es la aceleración centrípeta
La aceleración centrípeta viene dada por:
[tex]a_{c} = \omega^{2} r[/tex]
En donde:
ω: es la velocidad angular del objeto = 3 rev/s
r: es el radio = 1.20 m
Entonces, la tensión es:
[tex]T = m\omega^{2} r = 0.200 kg(3\frac{rev}{s}*\frac{2\pi rad}{1 rev})^{2}*1.20 m = 85.3 N[/tex]
Por lo tanto, la tensión es 85.3 N.
Espero que te sea de utilidad!
37. A baseball is pitched at a speed of 40 m/s. How long does it take the ball to travel 27
meters from the pitcher's mound to home plate?
Answer:
0.675
Explanation:
hope you get it right
Answer:
[tex]0.675\:\mathrm{s}[/tex]
Explanation:
Displacement can be given as [tex]\Delta x=v_x\cdot t[/tex]
Substituting given values, we have:
[tex]27=40t,\\t=\frac{27}{40}=\boxed{0.675\:\mathrm{s}}[/tex]
A weightlifter is lifting a load of 60 kg to a height, h. If the energy used to lift the load is 1020 J, what is h?
Answer:
P.E=mgh 1020=60×10h 1020=600h 1.7kg
calculate the mass of air in a room if the floor dimensions are 10m × 12m and height is 400 cm the density of air is 1 .26 kg/M³ 3
Explanation:
first find the volume of room --->
[tex]v \: = 10 \times 12 \times (400 \times {10}^{ - 2} ) \times = 480 \: {m}^{3} [/tex]
then find the mass
[tex]mass \: = \: density \: \times \: volume \: = 480 \times 1.26 = 604.8 \: kg[/tex]
1.Under normal atmospheric pressure what temperature does:
i.Ice turn to water?
ii.water turn to steam?
2.In which order do the following take place during water purification?
a)chlorination b)screening c)filtration d)sedimentation
b.Which of these processes ensures that the water contains no harmful microorganisms
Answer:
1.i)heat
ii.)heat
2.a.)b,c,d,a
b.)a.chlorination
Answer:
B
Explanation:
B