Answer:
(a) the height of the diving board is 22.896 m
(b) the horizontal distance traveled by the girl is 7.02 m
(c) if she had just drop off the board, her time to drop to the water would have been longer.
Explanation:
Given;
initial speed of the girl, u = 3.9 m/s
time to hit the water, t = 1.8 s
(a) the height of the diving board is calculated as;
h = ut + ¹/₂gt²
h = (3.9 x 1.8) + ¹/₂ x 9.8 x 1.8²
h = 7.02 + 15.876
h = 22.896 m
(b) the horizontal distance traveled by the girl is calculated as;
X = ut
X = 3.9 x 1.8
X = 7.02 m
(c) if she just drop off the board, then the initial speed will be zero;
h = ut + ¹/₂gt²
h = 0 + ¹/₂gt²
2h = gt²
[tex]t^2 = \frac{2h}{g} \\\\t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2 \ \times\ 22.896 }{9.8} }\\\\t = 2.16 \ s[/tex]
Thus, if she had just dropped off the board, her time to drop to the water would have been longer.
21. A delivery driver drove south 230 km from Sawpit to Gassville. He then turned around and drove back north for 71 km to Mount Carmel. The total trip took 9 hours
What was the delivery driver's average speed?"
Average speed
km per hour
"Round your answer to two decimal places if necessary
The process of a nucleus giving off radioactive particles to become more stable is called
Answer:
Radioactive Decay
Explanation:
When going from a fast speed to a slow speed how is light bent?
1.away from the normal line
2.toward the normal line
Answer:
Toward the normal line
Explanation:
I had the same question on a quiz
An empty coke bottle is dropped off a 236 m high cliff in Nairobi. At what speed does the bottle hit the ground?
Answer:
v=68[m/s]
Explanation:
To solve this problem we have to use the law of energy conservation, which tells us that potential energy is converted into kinetic energy.
[tex]E_{pot}=E_{kin}[/tex]
[tex]E_{pot}=m*g*h[/tex]
[tex]E_{kin}=0.5*m*v^{2}[/tex]
where:
m = mass [kg]
g = gravity acceleration = 9.81 [m/s²]
h = elevation = 236 [m]
v = velocity [m/s]
[tex]m*9.81*236=0.5*m*v^{2}\\2315.16 = 0.5*v^{2}\\v=\sqrt{4630.32} \\v=68[m/s][/tex]
HELP WILL MARK BRAINLIEST!!
Answer:15
Explanation:
Question 2 (10 points)
NEED HELP ASAPPPPPPP!!!!
To stop the soccer ball, and gain control of it is called what?
(a) winning
(b) trapping
(c) stopping
(d) kicking
Answer:
traping
Explanation:
Answer:
B. Trapping
Explanation:
Create a scenario that explains relative motion.
Un carro parte del reposo y acelera uniformemente a 4.0 m / s^2 durante 5.0 s. A continuación, mantiene la velocidad que alcanzó durante 10 s. Luego, disminuye la velocidad a una velocidad constante de 2.0 m / s^2 durante 4.0 s.
Answer:
Average speed of the car = 16.53 m.s
Explanation:
For first 5 seconds:
As the car starts from rest, so the initial speed of the car, u=0
Acceleration, a= 4 m/s^2
So, the final speed (speed at time, t=5 second)
v=u+at
v=0 + 4 x 5 = 20 m/s
Distance covered,
[tex]s=ut+\frac 1 2 a t^2 \\\\s=0+\frac 1 2 \times 4 \times 5^2[/tex]
s=50 m
As the car maintained the constant speed of 20 m/s for the next 10 seconds.
Distance traveled in 10 seconds, d=20 x 10 =200 m
For the last 4 seconds:
The car slows down at the rate of 2.0 m / s ^ 2 from the speed of 20 m/s.
As the car slows down, so the acceleration will be negative, i.e a=-2 m/s^2
[tex]s=ut+\frac 12 at^2 \\\\s=20\times 4 +\frac 12 (-2)4^2[/tex]
s=80-16=64 m.
Considering all three cases, the total distance covered=
=50+200+64=314 m
Total time= 5+10+4=19 s
So, the averate peed= Totat distance covered / total time taken
=314/19=16.53 m/s
a 2kg box frictionless ramp angle 60 degrees top of ramp is 30 m how long will it take to reach the ground
Answer:
2.66secs
Explanation:
To get the time it will take to reach the ground, we will use the equation of motion;
S = ut + 1/2at²
S is the distance
u is the initial velocity
g is the acceleration due to gravity
Given
S = 30m
u = 0m/s
Let's get the acceleration
According to newton's second law;
[tex]\F_x = ma_x\\F_m - F_f = ma_x\\mgsin \theta - 0 = ma_x\\gsin\theta = a_x\\a_x = 9.8sin 60\\a_x = 9.8(0.8660)\\a_x = 8.49m/s^2[/tex]
Get the required time:
Recall that: S = ut + 1/2at²
Substitute the given parameters and find t
30 = 0(t) + 1/2(8.49)t²
30 = 4.24t²
t² = 30/4.24
t² = 7.08
t = √7.08
t = 2.66secs
Hence it take the box 2.66seconds to reach the ground
Andre listed some properties of electromagnetic waves.
1) transfer thermal energy by radiation
2) can transfer energy over great distances
3) need matter to transfer energy through
4) are disturbances that carry energy
Which best describes Andre’s error?
Electromagnetic waves transfer thermal energy by conduction.
Electromagnetic waves can only transfer energy over short distances.
Electromagnetic waves can transfer energy through empty space.
Electromagnetic waves are not considered disturbances.
Answer: Electromagnetic waves can transfer energy through empty space.
Explanation:
Electromagnetic waves are formed when an electric field comes in contact with a magnetic field. The electric field and magnetic field of an electromagnetic wave are perpendicular to each other. They are also perpendicular to the direction of the wave.
Electromagnetic waves travel with speed of light in vacuum.
Electromagnetic wave does not need a medium to propagate or travel from one place to another. Electromagnetic waves are 'transverse' waves which means that they are measured by their amplitude and wavelength.
Electromagnetic waves do not lose energy when they travel and thus can travel far from its source.
Answer:
C.
Electromagnetic waves can transfer energy through empty space.
Explanation:
cause i dont need one
At night, within how many feet of approaching a vehicle from the rear must you dim your high beam headlights
Answer: 500 ft
Explanation:
High beam headlights help one to see better at night as the range of vision is greatly expanded. They can however, blind drivers coming on the opposite lane.
It is therefore prudent to ensure that when using high beam headlights, you dim them when a car is coming towards you. The appropriate distance to do so is a minimum of 500 ft from the car.
WILL MARK BRAINIEST!!!!!! (Fill in the blanks with the possible answers at the bottom)
1. A Shallow __ is a good indicator of tsunamis, but sends data very slowly and cannot detect earthquakes. *
2. A __ is caused by a sudden shift in the ocean crust which displaces the water. *
3. Tsunamis are common at __ plate boundaries, since large earthquakes release the built up pressure, resulting in a quick vertical movement of the plate. *
4. A tsunamis is possible, but unlikely at a __ plate boundary where two plates are moving sideways past each other. *
5. The Indonesian Earthquake of 2004 had a 9.1__, which was the third largest ever recorded in human history. *
ALL POSSIBLE ANSWERS!!!!
A. Earthquake,
B. Tsunami,
C. Magnitude,
D. Sensor,
E. Transform,
F. Convergent,
G. Divergent.
the photo shows a swimmer pushing off the side of a pool
Answer:
Every action has an equal and opposite reaction.
Explanation:
Answer:
An action-reaction force pair
Explanation:
define work and power
Answer:
Work and power is described below in complete details.
Explanation:
Work is described as the method of energy change to the movement of an object through the employment of force. This is ordinarily expressed as the outcome of power and displacement. The SI unit of work is Joule. Power is described as the quantity of energy conveyed in unit time. Power is a measure of the amount of work performed per unit of time.
An electric heater is rated at 1500 W. If the heater is rated as 80% efficient, calculate the output
rate of energy
Answer:
Power = 1200 [W].
Explanation:
The efficiency of an electrical equipment is defined as the relationship between the power realized, over the power that is consumed. For this case, they give us the data of consumed power and efficiency in this way we can calculate the power that the equipment performs.
[tex]Efficency=\frac{Power_{done}}{P_{consumed}}\\0.8 = \frac{Power_{done}}{1500} \\Power_{done}=1500*0.8\\Power_{done} = 1200 [W][/tex]
This means that of the 1500 [W], 1200 [W] are actually used to get the job done. This is established by means of the first law of thermodynamics.
What is the motion of the particles in this kind of wave?
O The particles will move up and down over large areas.
O The partices will move up and down over small areas.
O The particles will move side to side over small areas.
O The particles will move side to side over large areas.
Answer:
a is correct
The particles will move up and down over large areas.
Answer:
B. The particles will move up and down over small areas.
Explanation:
I just took the quiz and got 100% :)
Which expression is equivalent to 5(2+7)? 0 2(5+7) O 2 + 7(5) O 5(2)+7 O 5(2)+5(7)
Answer:
5(2)+5(7)
Explanation:
5(2)+5(7)=10+35=45
If you put 2 eggs in water for 5 secs will it explode???
Answer:
No not at all
Explanation:
Answer:
Hard-boiled eggs don't react well (or, depending on the perspective, react extremely well) to microwaves. Heat one up in a microwave and — assuming it doesn't burst
so yeah it does not explode
Why is it generally easy to filter out particles in suspension?
Answer: A suspension is a heterogeneous mixture in which some of the particles settle out of the mixture upon standing. The particles in a suspension are far larger than those of a solution, so gravity is able to pull them down out of the dispersion medium (water).
Explanation:
What is the KE of a 13kg boulder moving at 78.3m/s?
Answer:
39850.785 J
Explanation:
0.5 x m x v^2
0.5x13x78.3^2
Answer:
KE =
[tex] \frac{1}{2} m {v}^{2} \\ [/tex]
Explanation:
[tex]ke = \frac{1}{2} m {v}^{2} \\ = \frac{1}{2} \times 13 \times {78 . 3}^{2} \\ ke = 39850.785j \\ [/tex]
A light ray transfers from more to less dense medium at certain condition , if we repeat this experiment by increasing the angle of incidence in more dense medium to double its value in the 1st condition so the value of the relative refractive index between the 2 media is
increased to double
decreased to half
still constant
there is no relative refractive index between more and less dense medium
Answer:
The correct option is;
Still constant
Explanation:
The relative refractive index ₁n₂ between the two medium can be as follows;
[tex]_1n_2 = \dfrac{The \ speed \ of \ light \ in \ medium \ 1}{The \ speed \ of \ light \ in \ medium \ 2} = \dfrac{c_1}{c_2}[/tex]
Therefore, given that the speed of light in medium 1 is constant and the speed of light on medium 2 is also constant, the relative refractive index ₁n₂ = c₁/c₂ is always constant.
Referring to the graph below of data describing a cart pulled across a level surface. When a 4 N force pulls on the cart, the cart accelerates at 5 m/s^2. What is the friction force resisting the pull?
Answer:
0.5 N
Explanation:
(0.6 kg)(9.8 m/s^2) = 5.88 N
(0.6 kg)(5 m/s^2) = 3 N
4 N - 3 N = 1 N
1 N/5.88 N = 0.17
(0.17)(3 N) = 0.51 N which rounds to 0.5 N
When a 4 N force pulls on the cart, the cart accelerates at 5 m/s². The frictional force resisting the pull is 0.5 N.
What is friction?Friction is defined as the force preventing sliding solid surfaces, fluid layers, and material components from moving relative to one another. When two bodies in contact move in relation to one another, friction, a resistive force, arises. friction factors Between-body surface adhesion: When two materials are in close proximity to one another, a molecular force called adhesion is created.
(0.6 kg) (9.8 m/s²2) = 5.88 N
(0.6 kg) (5 m/s²2) = 3 N
4 N - 3 N = 1 N
1 N/5.88 N = 0.17
(0.17) (3 N) = 0.51 N ≅ 0.5 N
Thus, when a 4 N force pulls on the cart, the cart accelerates at 5 m/s². The frictional force resisting the pull is 0.5 N.
To learn more about friction, refer to the link below:
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Determine the molar mass of CeAl12O19.
Answer:
1 mole = 767.882 g
1 gram = 0.001 mole
Explanation:
The molar mass of CeAl₁₂O₁₉ is 770.686grams. The molar mass of a substance is the amount of substance which is present in one mole of the compound.
What is Molar mass?Molar mass of a substance is the mass in grams of one mole of the compound or chemical substance. In a chemical substance, the amount of entities which are present such as atoms, molecules, ions, is defined as a mole. A mole of any substance has 6.022 × 1023 molecules in it.
The molar mass of CeAl₁₂O₁₉ can be calculated as it is made up of three atoms which are Ce (Cerium), twelve atoms of Aluminium (Al), and nineteen atoms of O (Oxygen).
Atomic mass of Cerium = 140.116u
Atomic mass of Aluminium = 26.981539 u
The mass of 12 Aluminium atoms = 12 × 26.98 u
The mass of 12 Aluminium atoms = 323.76 u
Atomic mass of Oxygen = 15.999 u
The mass of 19 atoms of Oxygen = 303.81 u
Therefore, the mass of CeAl₁₂O₁₉ = 140.116 u + 323.76 u + 303.81 u
The molar mass of CeAl₁₂O₁₉ is 770.686 grams.
Learn more about Molar mass here:
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HELP!! I need an explanation for this question!
Assuming a constant force, and hence a constant acceleration a, we have by Newton's second law,
4.0 N = (1.2 kg) a → a = (4.0 N) / (1.2 kg)
and by definition of average velocity,
a = (5.0 m/s - 2.0 m/s) / t
where t denotes the time for which the force is applied.
So,
(4.0 N) / (1.2 kg) = (3.0 m/s) / t → t = (3.0 m/s) (1.2 kg) / (4.0 N) = 0.90 s
The diagram is a real world example of the first and second laws of thermodynamics. It shows how thermal energy is used to generate electricity. Which best describes how the diagram illustrates both laws of thermodynamics?
Answer:
First law: kinetic energy is used to turn an electric generator
Second law: some thermal energy is lost to the environment as it travels through the system
Explanation:
The first law of thermodynamics is known as the law of conservation of energy. It states that energy can neither be created nor destroyed but can only be transferred or changed from one form to another. When thermal energy is used to generate electricity, the kinetic energy of the steam is used to turn the electric generator (thereby producing electrical energy).
The second law of thermodynamics states that energy transfer or transformation leads to an increase in entropy resulting in the loss of energy. This law also states that as energy is transferred or transformed, some is lost in a form that is unusable. When thermal energy is used to generate electricity, some of the thermal energy is lost to the environment as it travels through the system.
Answer:
NOT A
Explanation:
Sorry I couldn't guess it right. Source EDGEN
1. How much heat is produced if you heat .25 kg water from 25 degrees C to 100 degrees C. The specific heat of water is 4180 J/kg C.
Answer:
Q = 78375 [J]
Explanation:
To solve this problem we must use the following ideal equation for the thermal energy of an element or substance depending on the temperature change.
[tex]Q=m*C_{p}*(T_{final}-T_{initial})[/tex]
where:
Q = heat [J]
m = mass = 0.25 [kg]
Cp = specific heat = 4180 [J/kg*C]
Tinitial = 25[°C]
Tfinal = 100 [°C]
[tex]Q =0.25*4180*(100-25)\\Q = 78375 [J][/tex]
Pollen is one-celled, or unicellular. It is used for reproduction in many types of plants. The bee is collecting nectar and, while doing that is transferring the very tiny pollen grains. The bee and the flowering plant are multicellular organisms, but they both have many things in common with the unicellular pollen What is one feature NOT shared by all three? All are made of one or more cells. The cells of each contain genetic material. The cells of each contain exactly the same parts.
Answer:
The cells of each contain exactly the same parts.
Explanation:
Three different organisms are involved in this question viz: pollen, bee and flowering plant. According to the question, they are all living organisms, which means that they all contain one or more cells.
Although they all have cells but the cells of each does not contain exactly the same parts. Bee is an animal while pollen produced by the flowering plants are plants, hence, the parts/organelles contained in each cell of the mentioned organisms are mentioned.
Do you attract the earth or the earth attract you ?Which one is attracting with a large force ?You or the earth
What is the GPE of a ball with a mass of 2.3N that is sitting on top of a shelf 3.25m high?
Answer:
mgh = GPE
Explanation:
2.3×3.25
7.475J
A projectile is launched from ground level at an angle of 30.0° above horizontal with a speed of 10.0 m/s. If the projectile is moving over level ground, what is the maximum height above the ground that the projectile reaches?
Answer:
Maximum height = 1.27 m
Explanation:
Given:
θ = 30°
Speed = 10 m/s
Find:
Maximum height
Computation:
Maximum height = v²(sinθ)² / 2g
Maximum height = 10²(sin30)² / (2x9.81)
Maximum height = 1.27 m