HELP + extra pts // Two 10-m high diving platforms are at opposing ends of a 30-m pool. How fast must two clowns run straight off their boards if they want to collide at the middle of the pool and the surface of the water?
Explanation:
The clowns need to leave the diving boards with enough horizontal velocity such that each travels 15 m (half the width of the pool) in the same time that they fall (vertically) the 10-m from the top of the diving board.
We'll assume no force acts on the clowns horizontally to slow them down while they are in flight. And we'll assume that only gravity acts on the clowns vertically.
We can treat the horizontal and vertical components separately. This will help simplify the problem.
Let's start with the vertical displacement. Let's say the clown is dropped from a height of 10-m. How long would it take them to fall that distance?
Using our equations of motion (with constant, linear acceleration), we can solve for this time. [tex]d = vt + \frac{1}{2} at^2[/tex]
Where d is the distance travelled, v is the initial velocity, a is acceleration, and t is time.
If the clown is dropped, they have an initial velocity of 0 (zero). We assumed only gravity acts on the clown, so acceleration equals the gravitational acceleration on earth. [tex]a = 9.8m/s^2[/tex]
The distance the clown travels is 10-m from the diving board to the surface of the water.
Let's solve. [tex]10 = 0*t + \frac{1}{2} (9.8) t^2 \rightarrow 20/9.8 = t^2 \rightarrow t = \sqrt{20/9.8}[/tex]
Now that we know time, we can calculate how fast the clown needs to be running when they leap from the diving board to cover a distance of 15-m (Remember, half the width of the pool.)
Using our equations of motion, we know that [tex]d = vt + 0.5at^2[/tex]
We assumed no forces act horizontally on the clown, therefore a = 0. We just need to solve for v. Substituting in the time we just solved for, we get something like this. [tex]15 = v \sqrt{20/9.8}[/tex]
I'll leave it to you to solve this equation.
1.
Sarah has a chocolate box that has a length of 12 cm, a width of 6 cm, and a height of 9
cm. What is the volume of the box?
2.
A water tank is 90 m long. 60 m wide, and 40 m deep. What is the volume of the water
tank?
3. A rectangular prism has a length of 4 m, a height of 9 m, and a width of 2 m. What is the
volume of the prism?
Answer:
i d k ok
Explanation:
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Question:
Use your knowledge of waves in the graph shown to determine the frequency of wave C. What does it tell you about the speed of the wave?
"Frequency" means how often something happens. When you say how many times it happens every SECOND, you can call the number Hertz, or Hz.
In the graph, there are 10 vibrations in 10 seconds, 20 of them in 20 seconds, and 30 in 30 seconds. This should pretty much shout at you "THERE'S ONE VIBRATION EVERY SECOND !". When you realize that, you can say the frequency of the vibration is 1 Hz.
The graph tells us nothing about the speed of the waves. I suspect there's another picture to the question that you didn't include. If the other part shows the wavelength, then we could figure out the speed. But with just what you're showing us, we can't.
Do you hear sounds around you as one frequency at a time or as many frequencies at once?
Answer:
The commonly stated range of human hearing is 20 Hz to 20 kHz. Under ideal laboratory conditions, humans can hear sound as low as 12 Hz and as high as 28 kHz, though the threshold increases sharply at 15 kHz in adults, corresponding to the last auditory channel of the cochlea.
Explanation:
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Answer:
20 Hz to 20 kHz. Humans can hear sound as low as 12 Hz and as high as 28 kHz, though the threshold increases sharply at 15 kHz.
Explanation:
learned this in physics about 2 years ago and its stuck with me ever since lol. sorry i am not the best at explaining lol
please answer I will give brainleist
which pair of chromosomes is the s3x chromosomes? Why?
Autosomes are homologous chromosomes i.e. chromosomes which contain the same genes (regions of DNA) in the same order along their chromosomal arms. The chromosomes of the 23rd pair are called allosomes consisting of two X chromosomes in most females, and an X chromosome and a Y chromosome in most males.
calculate the acceleration due to gravity on the International Space Station (which orbits at a distance of 408,000 m)
Answer:
none
Explanation:
none cause it's in space
Which of these materials would result in horizontally polarized light?
OA.
O B.
OC.
OD.
OE.
reflection from a tall aluminum pole
refraction from a glass sheet
reflection from an iron shed
reflection from wet asphalt
refraction from a water surface
does this man look okay? hes all pink and stuff O_O hes teaching me frickin science
Answer:
He is pink panther. How nerdy does he sound?
Explanation:
A 1.5 kg block moves at 4 m/s
Answer:
12 joules
Explanation:
I'm assuming you're looking for kinetic energy?? Kinetic energy is 1/2 mv^2. 4 squared is 16, 16 times 1.5 = 24. 24/2 = 12.
Electric Field Hockey
In this activity, you will again explore the relationship between an electric field and charged particles in the field, but this time you’ll have a gaming challenge. To begin, open Electric Field Hockey.
Directions:
On the control bar, make sure that the Puck is Positive and the Field boxes are checked. Also, make sure that the Practice option is selected.
Your aim is to score goals by manipulating the black puck (test charge) into the blue-colored bracket (goal) on the right. Think smart and place positive source charges (red) and negative source charges (blue) in such a way that the black puck moves into the goal.
Note that when you place a red, positive source charge in the hockey field, a red arrow appears on the black puck (test charge) showing the force the positive charge exerts on the puck. Similarly, when you place a blue, negative source charge in the hockey field, a blue arrow appears on the black puck (test charge) showing the force the negative charge exerts on the puck.
Question 1
Part A
Place a red charge on the hockey field and click Play. In which direction do electric field lines point? In which direction does the black puck move? What conclusion do you draw from this movement?
Part B
Click Reset and then click Clear. Now, place a blue charge in the hockey field and click Play. In which direction do electric field lines point? In which direction does the black puck move? What conclusion do you draw from this movement?
Part C
Manipulate the mass of the puck by dragging the mass bar to the right to increase the mass and to the left to decrease it. What changes do you see in the speed of the puck? Which principle works behind this change?
Part D
In the same situation, what do you observe about the relationship between the speed of the black puck and its distance from the blue charge?
Question 2
You can make the puck travel in complex ways by placing a set of charges around on the field. So, here’s your game challenge: Arrange sources charge around to propel the puck from its starting position into the goal. That’s pretty easy for a straight shot; you just put a negative charge behind the goal. But what if there are barriers along the way? This is a real test of your physical understanding, including Newton’s laws of motion and electrostatic forces. Game’s on!
Part A
On the control bar, check the Trace and Field boxes. The game has three Difficulty levels. Start with Difficulty level one and arrange source charges to get the puck into the goal. Once you’ve made a score at any level, increase the Difficulty level. Take a screen capture of two of your most difficult goals and paste them here. At least one of these should be at Difficulty level 2 or 3.
Please Answer Questions with complete sentences.
Answer:
The positive charges point away from each other
Explanation:
Why?
Arrows point away from the positive charge and toward the
negative charge.
Explanation:
Suppose that you rubbed a balloon with a sample of animal fur such as a wool sweater or even your own hair. The balloon would likely become charged and its charge would exert a strange influence upon other objects in its vicinity. If some small bits of paper were placed upon a table and the balloon were brought near and held above the paper bits, then the presence of the charged balloon might create a sufficient attraction for the paper bits to raise them off the table. This influence - known as an electric force - occurs even when the charged balloon is held some distance away from the paper bits. The electric force is a non-contact force. Any charged object can exert this force upon other objects - both charged and uncharged objects. One goal of this unit of The Physics Classroom is to understand the nature of the electric force. In this part of Lesson 1, two simple and fundamental statements will be made and explained about the nature of the electric force.
Perhaps you have heard it said so many times that it sounds like a cliché.
Opposites attract. And likes repel.
These two fundamental principles of charge interactions will be used throughout the unit to explain the vast array of static electricity phenomena. As mentioned in the previous section of Lesson 1, there are two types of electrically charged objects - those that contain more protons than electrons and are said to be positively charged and those that contain less protons than electrons and are said to be negatively charged. These two types of electrical charges - positive and negative - are said to be opposite types of charge. And consistent with our fundamental principle of charge interaction, a positively charged object will attract a negatively charged object. Oppositely charged objects will exert an attractive influence upon each other. In contrast to the attractive force between two objects with opposite charges, two objects that are of like charge will repel each other. That is, a positively charged object will exert a repulsive force upon a second positively charged object. This repulsive force will push the two objects apart. Similarly, a negatively charged object will exert a repulsive force upon a second negatively charged object. Objects with like charge repel each other.
The activity where to explore the relationships between the electricity field charged with particles and those of the hockey field
The positively change will attract to each other and will opposite to the negatively changed ones. Arrows point away from the positive charge and toward the negative charge.Learn more about the you will again explore the relationship.
brainly.com/question/12661264.
One advantage that sexual reproduction has over asexual reproduction is the ability to produce genetic diversity. Why is genetic diversity an advantage?
Answer:
Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population. Genetic variation is advantageous to a population because it enables some individuals to adapt to the environment while maintaining the survival of the population
Explanation:
Source: the internet
Please help with these questions!!!!!
Answer:
4.c
5.d
6.c
Explanation:
If there are two forces going in the same direction how would you find the net force?
a
add
b
multiply
c
subtract
d
divide
Answer:
A) Add
Explanation:
Answer:
a. add
Explanation:
Net [anything] is just a fancy way of saying total.
(Note that you would subtract if they were going in opposite directions. (Technically, you would be adding a negative, but that's the same as subtracting.))
what are the standard units of displacement?
Think about the types of forces holding the atoms together in different chemicals. Are there any patterns that can be drawn from the data? Explain.
Hello. You did not enter the data to which this question refers, which makes it impossible for it to have an exact answer. However, I will try to help you in the best possible way.
The forces that hold the elements together are called intermolecular forces. They are formed by covalent bonds between the molecules and can be called: dipole-induced (occurs between nonpolar molecules that have a negative pole and a positive pole) and dipole-dipole (occurs between polar moileculas, except when hydrogen is present).
Help ASAP please ASAP
Answer:
the anwser you are looking for is B
Explanation:
Calculate the BMI for a person who is 5'1" and weighs 172 pounds before you calculate the BMI you must convert the height into meters and the weight into kg you can use the internet to convert them
The answer for this are
32.9
.03
184.86
It’s PE
Answer:
It is 32.9
Explanation:
a dvd player that is not playing but still plugged in still uses 10.0 of power. what is this vampire current if the machine is plugged into a 120 v electric outlet
Answer:
Current = 0.0833 Amperes
Explanation:
Given the following data;
Power = 10Watts
Voltage = 120V
To find the ampere-current;
Power = current * voltage
Substituting into the equation, we have;
10 = current * 120
Current = 10/120
Current = 0.0833 Amperes
4. If the velocity of the particles is high, they will collide with each other with less force.
a. TRUE
b. FALSE
Answer:
7657
Explanation:
b. FALSE
If the velocity of particle is high then they will collide with each other with a greater force because their momentum will be high
What is force?force is a push or pull on a body .
What is momentum?Momentum is the product of mass and velocity,
More the velocity, higher will be the momentum.
since force is directly proportional to rate of change of momentum
F = Δp/Δt
so on when bodies having higher velocities collide their rate of change of momentum is higher hence more will be the force
To know more on force here
https://brainly.com/question/13447525
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The mass of an object is the measure of what characteristic of the object?
O A. its volume
OB. the space it occupies
OC, the amount of matter it has
OD. its weight
ANSWER PLZ
Answer:
C. The amount of matter it has
What is a wind turbine often used for?
Answer:
Wind Turbines are used in a variety of applications from harnessing offshore wind resources to generating electricity for a single home.
Explanation:
Is it possible to have acceleration at constant velocity
Answer:
No
Explanation:
It is not possible to have acceleration at constant velocity
#HopeItHelps
pls help i’ll give brainliest if you give a correct answer!!
Answer:
Friction force is the correct answer.
Actually I'm wrong the person who has commented is correct
SOME ONE PLZ HELP WILL GIVE THE BRAINIEST
Answer:
I. 90%
II. 60 MW
Explanation:
From the question given above, the following data were obtained:
Power input = 600 MW
Power output = 540 MW
I. Determination of the efficiency.
Power input = 600 MW
Power output = 540 MW
Efficiency =?
Efficiency = output / input × 100
Efficiency = 540 / 600 × 100
Efficiency = 90%
II. Determination of the power wasted by the pump.
Power input = 600 MW
Power output = 540 MW
Power wasted =?
Power wasted = Power input – Power output
Power wasted = 600 – 540
Power wasted = 60 MW
In a good hit, a baseball and bat are in contact with each other for about 1 millisecond. In the first game of the 2012 World Series, Tigers pitcher Justin Verlander threw a 100-mph pitch to the Giants' Pablo Sandoval. Sandoval's hit returned the ball directly back at Verlander at 70 mph. Calculate the average force of the bat on the ball, during the contact. Round the final answer to the nearest whole number.
Answer:
Explanation:
100 mph = 100 x 1760 x 3 / ( 60 x 60 )
= 146.67 ft / s
70 mph = 70 x 1760 x 3 / ( 60 x 60 )
= 102.67 ft/s
Let mass of the ball = m .
The ball which was moving with a velocity of 146.67 ft/s is turned back by the action of force of bat on the ball and it moved in opposite direction with velocity of - 102.67 ft/s ( - ve sign due to reversed direction )
If m be the mass of ball
change in momentum = m x 146.67 - ( - m x 102.67 )
= m x 146.67 + m x 102.67
= 249.34 m
Change in momentum = impulse = force x time
Putting the given values
249.34 m = force x 1 x 10⁻³ ( time = 10⁻³ s )
force = 249.34 m x 10³ poundal .
Here m is mass of the ball in lb .
If the half-life of tritium (hydrogen-3) is 12.3 years, how much of
a 10 g sample of tritium is present after 250.0 years?
Answer:
0.0000076 grams
Explanation:
We're given the half life of Tritium to be 12.3 years. In order to find out the amount of substabce remaining:
Let's first find how many 'half lives' are in 250 years.
[tex]n = \frac{250}{12.3} = 20.325[/tex]
Now what is half life? It means the time taken for a given quantity of an element to lose half it's mass.
So in 12.3 years we can find that The amount of 250 g of Tritium will be 250/2 = 125 g. In 24.6 years we'll have 125/2 = 62.5 g
So now we can devise a formula:
[tex]m = \frac{original \: amount}{ {2}^{n} } [/tex]
Where m is the remaining amount and n is th number of half lives in the time given.
Using this formula we can calculate:
[tex]m = \frac{10}{ {2}^{20.325} } [/tex]
Doing this calculation we get:
[tex]m = 0.0000076 \: g[/tex]
As we can see a very small value remains.
Which of the following is not true about vitamins?
A. Vitamins assist in forming bone and tissue.
B. Vitamins are only found in plants.
C. Vitamins help your cells function properly.
D. Vitamins help the body use proteins, carbohydrates, and fats.
The strength of a gravitational force between two objects depends on
A. mass and volume.
B. distance and volume.
C. mass and distance.
D. size and shape.
Reset Submit
Answer:
C. mass and distance.
Explanation:
The strength of a gravitational force between two objects depends on mass and distance.
Which of the following objects has kinetic energy?
A) A diver standing on a diving platform.
B) A hockey puck gliding across the ice.
C)an archers bow that is drawn back.
D) a runner waiting on the starting blocks.
Answer:
B
Explanation:
A body has kinetic energy that is moving