Answer:
The cliff is 12.632 meter high.
Explanation:
Each stone experiments a free fall motion, that is, an uniformly accelerated motion due to gravity. We construct the respective equations of motion for each stone:
First stone
[tex]y_{1} = y_{o,1} +v_{o,1}\cdot t +\frac{1}{2}\cdot g\cdot t^{2}[/tex] (1)
Second stone
[tex]y_{2} = y_{o,2} +v_{o,2}\cdot (t-2) +\frac{1}{2}\cdot g\cdot (t-2)^{2}[/tex] (2)
Where:
[tex]y_{1}[/tex], [tex]y_{2}[/tex] - Final height of the first and second stone, in meters.
[tex]y_{o,1}[/tex], [tex]y_{o,2}[/tex] - Initial height of the first and second stone, in meters.
[tex]v_{o,1}[/tex], [tex]v_{o,2}[/tex] - Initial speed of the first and second stone, in meters per second.
[tex]t[/tex] - Time, in seconds.
[tex]g[/tex] - Gravitational acceleration, in meters per square second.
If we know that [tex]y_{o,1} = y_{o,2}[/tex], [tex]y_{1} = y_{2} = 0\,m[/tex], [tex]v_{o,1} = 0\,\frac{m}{s}[/tex], [tex]v_{o,2} = -30\,\frac{m}{s}[/tex] and [tex]g = -9.807\,\frac{m}{s^{2}}[/tex], then we find that time when both stones hit the ground simultaneously is:
[tex]4.904\cdot t^{2} = -30\cdot (t-2)+4.904\cdot (t-2)^{2}[/tex]
[tex]4.904\cdot t^{2} = -30\cdot t + 60 +4.904\cdot (t^{2}-4\cdot t +4)[/tex]
[tex]-30\cdot t +60 -19.616\cdot t +19.616 = 0[/tex]
[tex]49.616\cdot t = 79.616[/tex]
[tex]t = 1.605\,s[/tex]
The height of the cliff is:
[tex]y_{1} = y_{o,1} +v_{o,1}\cdot t +\frac{1}{2}\cdot g\cdot t^{2}[/tex]
[tex]y_{o,1} = 12.632\,m[/tex]
The cliff is 12.632 meter high.
A light wave has a frequency of [tex](6 \times {10}^{8}).[/tex]
What is the wavelength of the light wave?
(Assume the speed of light to be [tex](3 \times {10}^{8}).[/tex])
Answer:
0.5m or 50 cm
Explanation:
What property of sound does a decibel measure
What is the velocity of a wave with a frequency of 45 Hertz and a wavelength of 3 meters?
Explanation:
By using v=( f )x( lambda )
v= 45 s^-1 x 3 m
Therefore v = 135 ms^-1
100 POINTS!!!
Which condition is NOT necessary for a hurricane to form?
warm ocean waters
very low air pressure
high air pressure
warm, moist air rising
Answer:
very low air pressure and that's not 100 points
PLEASE HELLPPP ILL GIVE BRAINLY
which part of the United States would have generally cooler temperatures due to the effects of currents?
A ) East Coast
B ) Gulf Coast
C ) West coast
D ) Central States
Answer:
West coast
Explanation:
i think this is the ans
It is the disturbance or oscillation that travels through space and matter, accompanied by a transfer of energy.
Answer:
wave
Explanation:
A wave is defined as the disturbance that causes the movement of energy. The energy is transferred as the waves move from one place to another. A medium is required for the transfer of energy. Usually a wave travels through air or water. The process is carried on at a specific speed that is termed as the speed of propagation.
Giving Brainliest
Please help, Stay Safe and healthy
Answer: A I think
Explanation:
What kind of data does doppler radio provide
A. snowfall and freezing levels
B. temperature and atmospheric pressure
C. precipitation levels, cloud location, direction
D. flooding and tsunamis
Answer:
d
Explanation:
Relate the changes in molecular motion of particles as they change from solid to liquid to gas.
As the phase changes occur, the freedom of motion of the particles
increases.
As the phase changes occur, the freedom of motion of the particles
decreases.
Eliminate
As the phase changes occur, the freedom of motion of the particles
compresses.
As the phase changes occur, the freedom of motion of the particles is
constant.
When a colid cuch as ice begins to melt heat energy is added. What is the function of this added heat
Answer:
As the phase changes occur, the freedom of motion of the particles increases
Explanation:
In thermodynamics the state of matter: solid, liquid and gaseous.
We can characterize them, the solid state maintains a certain shape, which is why particles are tightly bound and can hardly move from their equilibrium positions.
The liquid state does not hold its shape, so the particles have more energy and can move a lot from their equilibrium position.
The gaseous state does not maintain the shape or the volume, so the interaction between the particles is very small, so they can move almost freely.
When examining the answer, the correct one is: As the phase changes occur, the freedom of motion of the particles increases.
In which circuit will the bulb or bulbs glow brightest?
a-A simple circuit with one bulb and one battery
b-A simple circuit with one bulb and two batteries
C-A simple circuit with two bulbs and one battery
Answer:
B - a simple circuit with one bulb and two batteries.
The circuit that would glow brightest is b - A simple circuit with one bulb and two batteries
Electric circuitThis is the path for transmitting current. It usually consists of an electrical energy source and an electrical load.
In any circuit, the electrical power available is determined by the number of batteries available (energy source) and thus the current.
Ohm's lawSince we know according to Ohm's law V = iR where
V = voltage, i = current and R = load.So, making i subject of the formula, we have i = V/R .
So, i ∝ 1/R this shows that the current is inversely proportional to the load.
Circuit that would glow brightesta simple circuit with more current and less load would glow brightest. So, having a simple circuit with two batteries increases the current in the circuit and having only one bulb means that there is less load in the circuit. Thus, the circuit with one bulb and two batteries will glow brightest.So, the circuit that would glow brightest is b - A simple circuit with one bulb and two batteries
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PLEASE HELLP ILL GIVE CROWN AND HEART
Surface currents in major oceans generally circulate in a ________ direction in the northern hemisphere.
A ) Clockwise
B ) Counter-clockwise
C ) Northern
D ) Southern
Answer:
Anti clockwise
hope it helps u
please mark me brailliest
A 70 Newton dog ran across the yard. What do we know about the dog?
The dog's volume
The dog's weight
The dog's mass
The dog's acceleration
When 70 Newton dog ran across the yard. we know The dog's weight. Hence option B is correct.
What is Newton's second law of motion. ?Force(F) applied on the body is mass(m) times its acceleration(a). i.e. F=ma according to this equation we get acceleration as a = this equation says that when we apply more force to the body, more acceleration it gets. When more is the mass of the body, greater force is needed to accelerate with same amount to that less mass.
70N dog means it is his weight, from which we can calculate its mass, by relation F = mg where g is acceleration due to gravity.
Hence for objective option B is correct, and for MSQ Both B and C is correct.
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https://brainly.com/question/10069252
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10. The elevator in the new office building warns that it can safely lift 300 kg at one time. If John (850N), Betty (530N), Robert (740N), and Alice (610N) all get in the elevator at once, can the elevator safely carry them up to the third floor?
I can't tell right away. The elevator's limit is given in terms of mass, but the four people are listed in terms of their weights. In order to compare them, we'll have to convert one or the other.
The total of the four people's weights is:
John . . . . . . . 850N
Betty . . . . . . . 530N
Robert . . . . . . 740N
Alice . . . . . . . .610N
Total . . . . . . 2,730N
The elevator can't accept more than 300 kg of mass.
The weight of any mass is (mass) x (gravity).
On Earth, 300kg weighs (300kg) x (9.8 m/s²) = 2,940 N.
Wonderful !
2,730N is less than 2,940N.
Yes ! According to Otis' engineers, John, Betty, Robert and Alice can safely ride the elevator together, (although Betty and Alice may have a different opinion).
PLEASE HELP—ITS PHYSICS AND I NEED ANSWERS ASAP
According to Newton, which of these will determine if and how an object will move?
Answer:
unbalanced force
Explanation:
According to Newton the determining factor on if and how an object will move is the unbalanced force acting upon that object. In Newton's first law he states that an object will remain at rest unless acted on by an unbalanced force. This unbalanced force needs to be stronger than any opposite force being acted upon by the same object. Enough so that the object exits its state of rest and begins moving in the direction in which the force is being applied. If the force is not strong enough to overcome the opposite forces then the object will not move.
hii please help i’ll give brainliest!!
Answer: It is the second one
Explanation: Just please trust me on this one
Answer: The answer to it is
B
Explanation:
Which are advantages of renewable resources? Check all that apply.
Renewable energy supplies are completely reliable everywhere.
Some renewable resources will never be used up.
Little or no waste is produced by renewable resource plants.
Electricity can be generated in large quantities.
Many renewable energy facilities have lower operating costs.
Answer:
Some renewable resources will never be used up.
Little or no waste is produced by renewable resource plants.
Many renewable energy facilities have lower operating costs.
Explanation:
just did on edge
Answer:
B,C, and E are correct
Explanation:
a) A 12 kg object has a velocity of 37.5 m/s. What is its momentum?
b) How far does it get in 16 s?
Answer:
The answer would be 450 m kg/s
Explanation/ Explanation / Example:
Provided an object traveled 500 meters in 3 minutes , to calculate the average velocity you should take the following steps: Change minutes into seconds (so that the final result would be in meters per second). 3 minutes = 3 * 60 = 180 seconds , Divide the distance by time: velocity = 500 / 180 = 2.77 m/s .
If this doesn't help let me know!
Don't scroll down. Help pls 22 POINTS!!
Answer:
I don't know if these are all right but these are my best answers. good luck and I hope you do well.
1. true
2. true
3. false
4. true
5. true
6. true
7. true
8. true
9. false
10. false
13. it stimulates the heart through chest compressions
14. on bare skin upper right shoulder and lower left ribs
15. no CPR
Explanation:
What does the diagram show about phases and the phase of the substance as it is heated? Check all that apply.
(ANSWERED)
The substance is a gas at more than 2,000°C.
The particles are close together but move in different directions between 0°C and 2,200°C.
The attractions between the particles increase in region 2.
The speed of the particles increases in region 5.
The substance does not exist as a solid.
(the answer is B and D) got a 100
Answer:
2 and 4
Explanation:
right on edge
Answer:
can confirm its 2 and 4
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
An athlete whirls a 8.00 kg hammer m from the axis of rotation in a horizontal circle, as shown in the figure below . The hammer makes one revolution in s. What is the centripetal force on the hammer ?
Answer:
[tex]mv \div r \\ mass \times velocity \div radius[/tex]
A student conducts an experiment in which a cart is pulled by a variable applied force during a 2 s time interval. In trial 1, the student exerts the force on a cart of mass M. In trial 2, the student exerts the force on a cart of mass 3M. In trial 3, the student exerts the force on a cart of 5M. In which trial will the cart experience the greatest change in momentum from 0 s to 2 s?
Answer:
The answer is "Including all three studies of 0s to 2s, that shift in momentum is equal".
Explanation:
Its shift in momentum doesn't really depend on the magnitude of its cars since the forces or time are similar throughout all vehicles.
Let's look at the speed of the car
[tex]F = m a\\\\a =\frac{F}{m}[/tex]
We use movies and find lips
[tex]\to v = v_0 + a t\\\\\to v = v_0 + (\frac{F}{m}) t[/tex]
The moment is defined by
[tex]\to p = m v[/tex]
The moment change
[tex]\Delta p = m v - m v_0[/tex]
Let's replace the speeds in this equation
[tex]\Delta p = m (v_0 + \frac{F}{m t}) - m v_0\\\\\Delta p = m v_0 + F t - m v_0\\\\\Delta p = F t[/tex]
They see that shift is not directly proportional to the mass of cars since the force and time were the same across all cars.
A 0.15-m straight wire moves with a constant velocity of 7.0 m/s perpendicularly
through a magnetic field. If the magnetic field has a strength of 0.40 T, what is the
electromotive force?
Answer: force is 0.42 N
Explanation: F = l·v·B
A good example of kinetic energy would be_____.
A. a car driving on a road
B. a stretched rubber band
C. a rollercoaster at the top of a hill
D. an Apple high in a tree
PLEASE HELP ME WITH THIS QUICK IT IS TIMED AND IM ONLY ON NUMBER 5 AND THERE IS 17 QUESTIONS
Answer:
B.) a stretched rubber band
Explanation:
-
Brainliest for correct answer :))
Choose the 2nd Option.....
A hockey stick moves toward a puck sitting on ice. A blue arrow labeled A points up from the puck. A blue arrow labeled F subscript g points down from the puck. What force is represented by vector A? If the hockey puck is moving to the right, what will happen when it is hit with a significant force by the hockey stick?
Answer:
normal force, the pluck will move off in a different direction
Explanation:
Answer:
Normal force, the puck will move off in a different direction
Explanation:
Derive, with full working, the symbol equation for the power output P watts of the energy transfer that occurs when a mass of m kg falls through a height of h metres in t seconds.
- The gravitational force on a 352 kg satellite is -2100 N. Find its
distance from Earth's center.
Answer:
8173.8 km
Explanation:
Fg=G(M*m/r^2)
r=sqrt(G*M*m/Fg)
G=6.6743*10^-11
M(earth)=5.972*10^24kg
M(object)=352kg
Fg=-2100N
r=sqrt((6.6743*10^-11)*(5.972*10^24kg)*(352)/-2100)
r=8173808m
r=8173.8km
According to Newton's calculations, gravity reduces to a fourth of what it was at the surface of the Earth if the distance from the planet's centre is doubled. At the Earth's surface, a satellite with a mass of 1,000 kg exerts a weight force of 9,800 N.
What gravitational force act on satellite?Satellites are pulled toward Earth by its gravity, even when they are hundreds of kilometres distant. The satellite doesn't fall back to Earth; instead, it travels into orbit above it due to gravity and the velocity it acquired during launch into space.
A satellite that is in a steady circular orbit around the Earth is always falling. It encounters a gravitational pull toward the centre of Earth as it orbits, which forces it to shift course and “fall” towards Earth.
Therefore, Since gravity is the only force acting on a satellite in circular orbit, the centripetal force and gravity must be equal: Fc = Fg.
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A boom is to be dropped from moving helicopter on the ground. Explain how can it hut the target ?
Answer:
A bomb that is dropped from a moving helicopter doesn't fall directly downward rather it follows the parabolic path as it were thrown horizontally from a height with certain initial velocity. Therefore, the bomb should be dropped from farther distance equal to the horizontal range before the helicopter reaches above the target.