Answer:
E = 2450 J
Explanation:
Given that,
Mass of Humpty Dumpty, m = 5 kg
He jumps from a 50 m high bridge.
Feeling nervous, he paces back and forth with a velocity of 2 m/s.
We need to find Humpty Dumpty's gravitational potential energy before jumping. The formula is given by :
[tex]E=mgh\\\\E=5\times 9.8\times 50\\\\E=2450\ J[/tex]
So, the required gravitaional potential energy is 2450 J.
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:
-
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:
PLEASE HELP!!!!!!!!!!!!!
a. A light wave travels through glass (n=1.5) at an angle of 28°. What angle does it have when
it passes from the glass into water (n = 1.33)?
B. Draw a ray diagram to locate the image of the object below. Write one or two sentences to describe the type of image, it’s size relative to the object, and it’s position with respect to the lens.
C. An object is located 94.0 cm from a concave mirror. The focal length is 34.0 cm. What is the image distance? Is the image real or virtual??
D. An Object is located 65.0 cm from a concave lens. The image distance is -11.8 cm. What is the magnification?
E. For a person who is nearsighted, seeing objects that are far away is difficult. The light from these objects does not get focused far enough back in the eye. Write one or two sentences to identify the type of lens that can be used to correct nearsightedness and describe why it works.
PLEAAAASE HELP MEEE
Answer:
A. The angle with which the light passes from glass into water is approximately 31.97°
B. The image formed is, real, inverted, and smaller than the object
C. The image distance is 53.2[tex]\overline 6[/tex] cm
The image is real
D. The magnification is approximately 0.182
E. The type of lens required is a concave lens which corrects the focus of a powerful eye lens or a long eyeball
Explanation:
The given parameters for the light wave are;
The refractive index of the glass medium, n₁ = 1.5
The angle of incidence of the light, θ₁ = 28°
The refractive index of water, n₂ = 1.33
A. Let θ₂ represent the angle with which the light passes from glass into water
Snell's law is mathematically stated as follows;
n₁·sin(θ₁) = n₂·sin(θ₂)
According to Snell's law, we have;
1.5 × sin(28°) = 1.33 × sin(θ₂)
sin(θ) = (1.5 × sin(28°))/1.33 = 0.52947920615
∴ θ₂ = arcsin(0.52947920615) ≈ 31.97°
The angle with which the light passes from glass into water, θ₂ ≈ 31.97°
B. Please find attached the drawing of the image created with Microsoft Visio
From the drawing, we have that the image formed is real inverted smaller than the object and between the focus and radius of curvature
C. The location of the object from the mirror, u = 94.0 cm
The focal length of the mirror, f = +34.0 cm
The mirror formula for a concave mirror is given as follows;
[tex]\dfrac{1}{f} = \dfrac{1}{u} + \dfrac{1}{v}[/tex]
Therefore, we have;
[tex]\dfrac{1}{34.0} = \dfrac{1}{94.0} + \dfrac{1}{v}[/tex]
[tex]\dfrac{1}{v} = \dfrac{1}{34.0} - \dfrac{1}{94.0} = \dfrac{15}{799}[/tex]
[tex]\therefore \dfrac{v}{1} = v =\dfrac{799}{15} = 56.2\overline 6[/tex]
The image distance, v = 799/15 = 53.2[tex]\overline 6[/tex] cm
Therefore the image is in front of the mirror, which is a real image
The image is real
D. The given parameters of the object and lens are;
The distance of the object from the lens, u = 65.0 cm
The distance of the image formed from the lens, i = -18 cm
The magnification, M, is given as follows;
[tex]M = \dfrac{-v}{u}[/tex]
Therefore;
[tex]M = \dfrac{-(-11.8)}{65.0} = \dfrac{59}{325} \approx 0.18153846153[/tex]
The magnification, M ≈ 0.182
E. For a person who is near sighted, the light from objects from distant location are almost parallel and are brought to a focus in front of the retina and therefore, they appear blurred
The use of a concave lens is required to correct nearsightedness as it causes the light to appear come from a point before the focus such that the divergent rays of the object refracted through the concave lens comes to a focus at the.
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
Sound waves move the fastest through which medium
Water at high temp
Water at low temp
Air at high temp
Air at low temp
Answer:
water at high temperature
Explanation:
When heated, molecules move faster which results in the sound waves being transmitted faster.
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.
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:
What property of sound does a decibel measure
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:
What is the correct reason for blinking / flickering of stars? Explain it.
A) The blasts in the stars.
B) Absorption of star light by the atmosphere.
C) Motion of the stars.
D) Changing refractive index of gases in the atmosphere.
plz suggest me a answer which can give me 3 marks
Answer:
d. changing refractive index of gases in the atmosphere
Explanation:
light from a star passes through the atmosphere to reach our eyes. however, the layers of gases in the atmosphere are in constant motion, so the light gets bent and appears to be flickering.
i hope this helps! :D
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:
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
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]
Brainliest for correct answer :))
Choose the 2nd Option.....
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.
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 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
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.
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!
11. All objects gain or release heat at the same rate. *
The statement is false.
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:
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.
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.
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
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
Learn more about electric circuit here:
https://brainly.com/question/19651288
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:
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
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:
- 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.
Learn more about satellite here:
https://brainly.com/question/9266911
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How much force would be expected to be needed to lift the weight of 87N when the effort length is 9.2m and the resistance length is 3.4m
Answer:
Force = 504.6 N
Explanation:
Weight, W = mg
Weight of object = 87 N
Effort length = 9.2 m
Resistance length = 3.4 m
The required length, h = Effort length - Resistance length
= 9.2 - 3.4
= 5.8 m
But,
F = mgh
= W x h
F = 87 x 5.8
= 504.6 N
The value of force required to lift the weight is 504.6 N.