Dennis, 60 feet in 0.5 seconds is the average speed of a pitcher's fastball. So, the correct option is (A).
What is the Average speed?Average speed is defined as the total distance covered by the object in a particular time interval. Average speed is a scalar quantity which is represented by the magnitude and not the direction.
The formula for average speed is found by calculating the ratio of the total distance traveled by the body to the time taken to cover that distance which is expressed as:
Average speed= Total distance travelled/ Time taken
The unit of the average speed is meter/second.
In the above given information, the pitcher's fastball average speed of Dennis is 120
Thus, Dennis, 60 feet in 0.5 seconds is the average speed of a pitcher's fastball. So, the correct option is (A).
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What are the 8 types of energy? SOMEONE PLEASE PLEASE HELP
thermal energy, radiant energy, chemical energy, nuclear energy, electrical energy, motion energy, sound energy, elastic energy and gravitational energy
The eight types of energy are Kinetic Energy, Potential Energy, Thermal Energy, Chemical Energy, Electrical Energy, Radiant Energy, Nuclear Energy, and Sound Energy.
The eight types of energy are:
Kinetic Energy: The energy possessed by an object due to its motion.
Potential Energy: The energy stored in an object based on its position or condition.
Thermal Energy: The energy associated with the motion of particles in a substance. It is related to temperature.
Chemical Energy: The energy stored in the bonds of chemical compounds.
Electrical Energy: The energy associated with the movement of electric charges.
Radiant Energy: The energy carried by electromagnetic waves, such as light or radio waves.
Nuclear Energy: The energy released or absorbed during nuclear reactions or radioactive decay.
Sound Energy: The energy produced by the vibration of objects and transmitted through a medium as sound waves.
These are the commonly recognized types of energy. It's important to note that energy can often be converted from one form to another.
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Is the number on a speedometer a scalar or a vector? PLS HELP !!
The slope of a distance vs. time graph is a measurement called
A. displacement
B. speed
C. correlation
D. velocity
Answer:
B. speed
Explanation:
im not sure hahahaha
The sum of potential energy and kinetic energy is
Answer:
The total mechanical energy
Explanation:
M = Mass
V = Velocity
G = Gravity
H = Height
KE = 1/2mv²
PE = mgh
ME = KE + PE
ME = 1/2 mv² + mgh
PLS HELP. WORTH 25 POINTS
Explain how conduction, convection, and radiation drive the water cycle in Earth’s system.
Answer:
During the day, sunlight heats the ground, which in turn heats the air directly above it via conduction. At night, the ground cools and the heat flows from the warmer air directly above to the cooler ground via conduction.
Explanation:
Luck For You!
The process, in which conduction, convection, and radiation drive the water cycle in Earth’s system, is discussed in the answer.
What is water cycle?The energy from the sun is what largely drives the water cycle. By evaporating water from the oceans, lakes, rivers, and even the soil, this solar energy powers the cycle. Through the process of transpiration, more water is transferred from plants to the atmosphere. Water droplets gradually acquire enough mass to fall back to Earth as precipitation as liquid water evaporates or transpires, forming clouds and water vapour.
The precipitation eventually transforms into runoff or groundwater and makes its way back into the surface reservoirs across a variety of periods. The hydrosphere currently contains the same amount of water as it has always contained in the Earth system since the water cycle is essentially a closed system.
Solar heat energy comes on earth's surface via radiation to the ponds, lakes, oceans, seas, rivers and other water resources and then the waterbodies get heated via conduction and evaporation happens. During evaporation time temperature water vapor goes to high altitude via convection of heat and cloud forms.
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In which box could “gas” be placed?
*C. W is not the answer
50 POINTS! I really need help with these pressure and volume questions from Boyle's Law. PLEASE HELP
1.If a sample of gas has a volume of 100.0ml when the pressure is 50.0kPa, what is the volume when the pressure is increased to 400.0kPa, assuming temperature and number of moles is held constant?
2. What pressure would be required to take 100.0ml of a gas at 103.0kPa and squish it down to 2.00ml, assuming temperature and number of moles is held constant?
4. If the temperature and number of moles are held constant, what would be the new volume if 2.00cm3 of a gas at 3.00atm is changed to 0.0200atm?
7. What pressure must be applied to a sample of Freon gas having a volume of 325L at 20.0°C and 723Torr to permit the expansion of the gas to a volume of 975L at 20.0°C?
Answer:
1) [tex]V_{1}[/tex]= 100ml = 0.1 L
2) [tex]P_{1}[/tex]= 50kPa
[tex]1) P_{2} =400 kPa\\2)V_{2} =?[/tex]
So,
[tex]P_{1}V_{1} = P_{2} V_{2}[/tex]
[tex]V_{2} = \frac{0.1 x 50}{400}[/tex]
[tex]V_{2} = 0.0125 L[/tex]
[tex]2) V_{1} = 100 mL = 0.1 L\\P_{1}= 103 kPa\\V_{2}=2 mL\\P_{2} =?\\[/tex]
[tex]P_{1} V_{1} =P_{2} V_{2}\\ P_{2}=\frac{0.1x103}{2}\\ P_{2}=5.15 kPa[/tex]
[tex]4) V_{1}=2 cm^{3} = 0.002 dm^3\\P_{1} =3 atm x 760 = 2280 torr\\P_{2} = 0.0200 atm x 760=15.2 torr[/tex]
Same, formula as above,
[tex]V_{2}=\frac{2280x0.002}{15.2}\\V_{2}=0.3 L[/tex]
[tex]7)V_{1}=325\\T_{1}=20^{0}C=293K\\ P_{1}=723 torr\\V_{2}=975L\\T_{2} = 20^0 C= 293K\\P_{2}=?[/tex]
By the formula,
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}} \\P_{2} = \frac{723x325x293}{293x975}[/tex]
[tex]P_{2} =241 Torr[/tex]
A motorbike reaches a speed of 20 m/s over 60m, whilst
accelerating at 3m/s?, determine the bike's initial speed.
Initial speed = 2√10 m/s
Further explanationLinear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration
An equation of uniformly accelerated motion
V = vo + at
Vt² = vo² + 2a (x-xo)
x = distance on t
vo / vi = initial speed
vt / vf = speed on t / final speed
a = acceleration
vf=20 m/s
d = 60 m
a = 3 m/s²
[tex]\tt vf^2=vi^2+2.ad\\\\20^2=vi^2+2\times 3\times 60\\\\400=vi^2+360\\\\40=vi^2\\\\vi=\sqrt{40}=2\sqrt{10}~m/s[/tex]
If Earth’s mass was cut in half, what would happen to your mass? Why?
Answer: decrease.
Explanation:
If Earth's mass was cut in half, what would happen to your mass? it would decrease because gravitational force decreases.
How long would it take Jesse with an acceleration of -2.50 m/s2 to bring his bicycle with an initial velocity of 13.5 m/s to a complete stop?
Answer: 5.4 seconds
Explanation:
The time taken to stop the bicycle is 5.4 seconds. The final velocity is zero. Then, the distance travelled by the bicycle is 36.45 m.
What is acceleration ?Acceleration is a physical quantity that, measures the rate of change in velocity. It is a vector quantity thus having both magnitude and direction. It can be defines as the ratio of change in velocity to the change in time.
Given initial velocity = 13.5 m/s
final velocity is zero since the bicycle is stopping.
then Δt = Δv/a
Δt = 13.5 m/s/ 2.50 m/s² = 5.4 seconds.
Hence, the bicycle will take 5.4 s to complete stop.
The distance covered within this time can be determined using the equation as follows:
s = ut + 1/2 at²
where u is the initial velocity
s = (13 m/s × 5.4 s) + (-2.50 m/s² ×5.4 s ×5.4 s) = 36.4 m.
Therefore, the bicycle will travel up to 36.4 m before stopping.
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Protons are found only in the atomic nucleus.
TRUE
FALSE
Answer:
true
Explanation:
Protons and neutrons are found in the nucleus
Why is there no weather on the Moon?
Answer:
the moon has no atmosphere, and it cannot trap heat or insulate the surface.
Explanation:
the moon is too small. ... With weak gravity, gases that are emitted from the surface quickly are lost to outer space.
If the distance from the Earth’s center to the Moon’s center were suddenly doubled, what would occur to the gravitational force between them?
(A) Gravitational force would decrease by a factor of 4.
(B) Gravitational force would increase by a factor of 4.
(C) Gravitational force would decrease by a factor of 2.
(D) Gravitational force would increase by a factor of 2.
Answer:
C)Gravitational force would decrease by a factor of 2.
Explanation:
Hope this helps :)
PLEASE HELP THIS IS DUE IN 10 MINUTES- (15 points!)
1st question- what are the weather fronts(use the pic for help)
2nd question- who has better weather— high pressure systems or low pressure systems and how do you know?
(Please add explanation)<3
Answer: I would say that B would have better weather because those dots on the right are cold fronts and the smooth side without the dots is a warm front. I hope this helps :)
Explanation:
which other team sport basketball is the most like.
hi
Answer: mmm... If you mean most like Basketball it's net ball but i don't know much about Basket ball teams
Explanation:
a tennis ball is thrown straight up with an initial velocity of 22.5 m/s how much total time is the ball in the air
Answer:
4.6s
Explanation:
v=u+at
0=22.5+(-9.8)t
-22.5=-9.8t
t=-22.5/-9.8
t=2.295 s
The total time will double
2.295×2=4.59s
=4.6s
what is the dimensional formula of potential difference
Answer:
[M1 L2 T-3 I-1]
For his science project, Austin wants to determine if the pH of standing rainwater changes over time. He collects rainwater and distributes it evenly in 5 jars and places them all indoors in a spot that does not receive a lot of sunlight to limit evaporation. Using a pH testing kit, he measures the pH of the water in the first jar on the 4th day, second jar on the 8th day, third jar on the 12th day, fourth jar on the 16th day and fifth jar on the 20th day. What is the independent, or manipulated, variable in Austin's experiment?
Answer:
This question lacks options, the options are:
A. the number of days the rainwater was allowed to sit
B. the number of times the rainwater was observed
C. the change in the amount of rainwater due to evaporation
D. the change in pH of the rainwater over time
The answer is A
Explanation:
In an experiment, the independent variable is the variable that is changed or manipulated by the experimenter in order to effect a measurable response.
In this experiment, Austin is trying to determine how time changes the pH of standing rainwater. He collects rainwater and distributes it evenly in 5 jars, which he measured the pH at different days using a pH testing kit. Hence, the independent or manipulated variable is THE NUMBER OF DAYS THE RAINWATER WAS ALLOWED TO SIT before measuring their pH.
Activity 3. Let's Do The Mathi
Direction: Use Newton's second law equation to solve for force, mass, and acceleration
Problem 1- A ball with a mass of 0.5 kg is hit with a force of 2.5N. What is its acceleration?
Problem 2- What is the acceleration of a 15kg box that is pushed across a horizontal surface
with a force of 50N?
Problem 3- An object with a mass of 2.0 kg has a force of 5.0 N applied to it. What is the
resulting acceleration of the object?
Problem 4- An object with a mass of 3.0 kg accelerates 2.5 m/s2 when an unknown force is
applied to it. What is the amount of the force?
Problem 5- An object accelerates 12.0 m/s2 when a force of 6.0 N is applied to it. What is the
mass of the object?
Answer:
Problem 1-
The acceleration = 5 m/s²
Problem 2 -
The acceleration = 3.[tex]\overline 3[/tex] m/s²
Problem 3 -
The acceleration = 2.5 m/s²
Problem 4-
The force applied = 7.5 N
Problem 5-
The mass of the object, = 0.5 kg.
Explanation:
Problem 1-
The mass of the ball, m = 0.5 kg
The force (applied) with which it was hit, F = 2.5 N
The acceleration, a = Force/Mass = 2.5 N/(0.5 kg) = 5 m/s²
The acceleration = 5 m/s²
Problem 2 -
The mass of the box, m = 15 kg
The force (applied) with which it was hit, F = 50 N
The acceleration, a = Force/Mass = 50 N/(15 kg) = 10/3 = 3.[tex]\overline 3[/tex] m/s²
The acceleration = 3.[tex]\overline 3[/tex] m/s²
Problem 3 -
The mass of the object, m = 2.0 kg
The force (applied) with which it was hit, F = 5.0 N
The acceleration, a = Force/Mass = 5.0 N/(2.0 kg) = 2.5 m/s²
The acceleration = 2.5 m/s²
Problem 4-
The mass of the object, m = 3.0 kg
The acceleration, a, of the object = 2.5 m/s²
The force applied to it, F = Mass × Acceleration = 3.0 kg × 2.5 m/s² = 7.5 N
The force applied = 7.5 N
Problem 5-
The acceleration, a, of the object = 12 m/s²
The force applied, F = 6.0 N
The mass of the object, m = Force/Acceleration = 6.0 N/(12 m/s²) = 0.5 kg
The mass of the object, = 0.5 kg.
Old thermometers contained very small amounts of mercury. The mercury in the photo has a melting point of −38.8 °C. What can you conclude about the melting point of the mercury in old thermometers?
A. Its melting point can only be determined when the mercury is burned.
B. Its melting point changes as the mercury’s temperature changes.
C. Its melting point equals −38.8 °C because it is mercury.
D. Its melting point is less than −38.8 °C because its volume is smaller.
Answer:
C. Its melting point equals −38.8 °C because it is mercury.
Explanation:
Given that the old thermometer contained a very small amount of mercury and the melting point of mercury is [tex]-30^{\circ}C[/tex].
The temperature at which any material starts changing from the solid-state to the liquid-state is known as the melting point of the material.
As the melting point of any material does not depends on the amount of material. So, whether there is a small amount of mercury or is a large amount of mercury.
Hence, the melting point remains [tex]-30^{\circ}C[/tex] because it is mercury.
So, option (C) is correct.
As per the definition above, there is no need to burn the mercury to determine the melting point, so option (A) is wrong.
The melting point does not depend on the initial temperature, mass, volume of the material, so options (B) and (D) are wrong.
Alok and his father are sitting at a distance of 5 meter on a seesaw. His father is at the distance of 2 meter from the fulcrum and Slok weighs 20 kg. If they are balancing the seesaw, find the weight of his father.
Answer:
30kg
Explanation:
Distance between Alok and father = 5m
Father's distance from fulcrum = 2m
Solak's weight = 20kg
Unknown:
Weight of the father = ?
Solution:
This problem entail the balancing of forces around a fulcrum.
In this problem;
workdone by father = workdone by Alok
( mass x distance) father = (mass x distance) Alok
distance of Alok from the fulcrum = 3m
Input the parameters and solve;
mass of father x 2 = 20 x 3
mass of father = 30kg
The weight of the father is 30kg
Why can u see the planets at night
Answer:
stupid question
Explanation:
Questlon 6 of 10 Which two types of energy does an apple falling to the ground have?
A. Potential energy
B. Nuclear energy
C. Kinetic energy
D. Elastic energy
E. Sound energy
A. Potential energy C. Kinetic energy
I just took the quiz
Answer:
Potential energy + Kinetic energy
Explanation:
ap3x verified
True or False. Energy can move in waves.
True, energy can in move in waves because waves transfers energy during their propagations.
A wave is a disturbance that transfers energy from one point to another, along its path of propagation.
A wave can be mechanical or electromagnetic.
A mechanical type of wave requires material medium for its propagation.
Examples;
sound wavewater waveAn electromagnetic wave does not require material medium for its propagation.
Examples;
Gamma rayx-rayultraviolet rayvisible light, etcThus, we can conclude that energy can in move in waves because waves transfers energy during their propagations.
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what is the least efficient way to roast a marshmallow using heat transfer conduction, convection, or radiation?
Answer:
convection
Explanation:
The only way convection can only take place in liquids and gas.Since the marshmello is neither,convection is the least effective way
Describe a circumstance where you want friction to work against Newton’s First Law.
Answer:
If I was riding my bicycle, and there was no friction to work against Newton's First Law, I'd give a first push, and I would never be able to turn or stop.
Explanation:
Two students described a part of Earth's innermost layer.
Daniel: Densest part
Joshua: Has highest temperature and pressure
Which part of the innermost layer did Daniel and Joshua describe?
They both described the outer part.
They both described the inner part.
Daniel described the outer part and Joshua described the inner part.
Daniel described the inner part and Joshua described the outer part.
Answer:
It is B
Explanation:
Because the high temp and perisher is inner and the densest is the same thing
Answer: They both described the inner part
Explanation:
What will most likely occur if sulfur forms an ionic bond with another element?
A. Sulfur will accept electrons.
B. Sulfur will donate electrons
C. Sulfur will become a positive ion.
D. Sulfur will become less stable.
Five mL of ethanol has a mass of 3.9 g, and 5.0 mL of benzene has a mass of 44 g. Which liquid is denser?
Answer:
Benzene
Explanation:
A denser substance will have a higher or larger mass in the same volume. Therfore benzene will be a denser liquid as the mass is bigger in the same volume compared to ethonal.
You can also work this out by using the density formula which is mass of the substance over the unit of volume.
please help im dying