What’s the force of a pitching machine on a baseball? Baseballs pitched by a machine have a horizontal velocity of 30 meters/second. The machine accelerates the baseball from 0 meters/second to 30 meters/second in 0.5 seconds. If a baseball has a mass of 0.15 kilograms, the force the machine exerts is newtons. Use F = ma, where .
Answer:
So F=ma
The acceleration of the baseball is:
where and are the final and initial speed of the ball, and is the time interval in which the force acted.
Replacing the numbers, we get
And at this point, we can use Newton's second law F=ma to find the value of the force of the pitching machine:
The cliff divers at acapulco, mexico, jump off a cliff 17.2 m above the ocean. ignoring air resistance, how fast are the divers going when they hit the water?
Halfway though a cross-country meet,a runner’s speed is 4m/s.In the last stretch,she increases her speed to 7m/s.What is her change in speed?
Answer:
The change in speed is 3m/s
Explanation:
The change is speed is defined as the difference between final and initial speed:
ΔV=[tex]V_{2}-V_{1}[/tex]
where V2 and V1 are the final and initial speeds, respectively.
Plugging in the values
ΔV=7m/s-4m/s=3m/s
Which is a drawback of agricultural technology?
A. Better communication
B. Prevents disease
C. Water pollution
D. Kills bugs
If a car goes along a straight road heading east and speeds up from 45ft/s to 60ft/s in 5s , calculate the acceleration
Joan is setting up an experiment in the lab to observe newton's second law of motion. she has a model car that has a mass of 45 kg, and it is accelerating at 7 m/s/s. she then increases the acceleration to 28 m/s/s. what happens to the force of the car?
Answer:
4 times its original size
Explanation:
study island said so
Which describes the movement of a fluid during convection?
A. Warm and cool fluids rise.
B. Warm and cool fluids sink.
C.Warm fluid rises and cool fluid sinks.
D.Warm fluid sinks and cool fluid rises.
Hello there!
The hotter molecules would then become expanded and then they would then be warm and cool, and then the fluids would then rise. When the fluids such as gas for example, when they are warm and then cool, they would then rise, and this would be an example of a movement of a fluid during convection.
I hope this helps you! :)
A. Warm and cool fluids rise.
B. Warm and cool fluids sink.
C.Warm fluid rises and cool fluid sinks.
D.Warm fluid sinks and cool fluid rises.
I hope this helps you!
If you're taking the course on Edge, the answer is C.
Is it accurate to describe the physical universe as composed of only matter and energy?
Plz explain , many thanks!
A ball is thrown downward at 5ms from roof 10m high its velocity when it reaches the ground is?,
Which of the following does the endocrine system regulate??
A. Hormones
B. Reflexes
C. Respiration
D. Senses
Answer: Your answer would be A Hormones
Hope this helped XD
Question 1 Unsaved
Most of the mass of the solar system is located in which of the following?
Question 1 options:
Earth
comets
sun
Jupiter
Answer:
The Sun
Explanation:
Did the test, k12
What is absolute zero? A. Zero on the Celsius scale B. The point at which all motion stops C. Zero on the Fahrenheit scale D. 273 on the Kelvin scale
Absolute zero is the theoretical lowest temperature at which all molecular motion stops. It's equivalent to -273.15 degrees Celsius or 0 Kelvin.
Explanation:Absolute zero refers to the lowest possible temperature that can be theoretically achieved. It represents the point at which all molecular motion is presumed to stop, which is choice B in your options. However, this doesn't mean that all forms of energy disappear at this temperature - quantum mechanics tells us that minimal vibrations persist even at this extreme. In practical terms, absolute zero is equivalent to -273.15 degrees Celsius, or 0 on the Kelvin scale (not 273 Kelvin as option D suggests). Neither 0 degrees on the Celsius scale (option A), nor 0 degrees on the Fahrenheit scale (option C), is equivalent to absolute zero.
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Jamal does not produce enough insulin to regulate his blood sugar. What part of the endocrine system is most likely being affected??
A. Adrenal gland
B. Pancreas
C. Pituitary gland
D. Testes
the mass of a proton is 1.6726 * 10^-24 and the mass of a electron is 9.1093 * 10^-28. What is the difference between the mass of a proton and the mass of an electron?
Answer:
Its C
Explanation:
1.6735 × 10–27
Plants use carbon dioxide for .
1. respiration
photosynthesis
In the following diagram, the voltage is 1.5 volts and the resistance is 6.0 ohms. Use Ohm's law to determine the current in the circuit.
A)0.25 amps
B)4.0 amps
C)6.0 amps
D)9.0 amps
HELP ASAP on a test
The current in the circuit from the voltage 1.5 V and the resistance 6 ohm is 0.25 ampere. Thus, option A is correct.
What is Ohm's law?Ohm's law is defined as the current flow in the circuit is directly proportional to the applied voltage in the circuit. Ohm's law is applicable at a constant temperature.
V∝I, where V is the potential difference and I is the current. Ohm's law can also be defined as, V = IR, and R is the resistance of the circuit. The unit of current is ampere(A).
Resistance is defined as the obstruction in current flow and the unit of resistance is ohm(Ω). Resistance is inversely proportional to the current flow. Resistance increases with the decrease of current and vice-versa.
From the given,
Voltage(V) = 1.5 V
Resistance (R) = 6 Ω
Ohm's law, V = IR
V / R = I
I = 1.5 / 6
= 0.25 A
I = 0.25 ampere
Thus, the current flow in the circuit is 0.25 A. Hence, the ideal solution is option A.
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When you hold a warm bowl, the temperature of your palms of your hands increases this is example of
In which situation would an object weigh the LEAST? (assume all the objects have the same mass) A) an object on Earth Eliminate B) an object on the moon C) an object half-way between the Earth and moon D) an object in space closer to the moon than the Earth
Answer: The correct answer is D.
Explanation:
The object weigh less on the moon than Earth. The weight of the object on the moon is one sixth the weight of the object on the Earth.
Greater the mass of the object, greater will be the gravitational force. Then more will be the weight of the object. The mass of the moon is less than the mass of the earth. The object weigh less on the moon than Earth.
As you go away from the Earth's surface, the weight of the object will get reduce.
An object in space closer to the moon than the earth.
Therefore, an object in space closer to the moon than the Earth would weigh the least.
If a ball is tossed straight up into the air, at what position is its potential energy the greatest? Question 2 options: a) when it is at the top b) when it is getting near the top c) when it leaves your hand d) when it starts to fall back to your hand
In order to effectively radiate a radio signal, an antenna must be at least one-half the wavelength of transmission in length, i.e., minimum antenna height = 1/2(λ). WITY operates at a frequency of 980.0 kHz. What is the minimum height (m) of the antenna that WITY (nostalgia radio) must have?,
The wavelength of the is the distance of corresponding points between the two consecutive waves.
The minimum height (m) of the antenna that WITY (nostalgia radio) must have is 153.06 meters.
What is the wavelength?The wavelength of the is the distance of corresponding points between the two consecutive waves.
It can be given as,
[tex]\lambda=\dfrac{c}{f}[/tex]
Here [tex]c[/tex] is the speed of light and [tex]f[/tex] is the frequency of the wave.
Given information-
The minimum height of the antenna is 1/2(λ).
The frequency on which the radio operates is 980.0 kHz.
As the speed of light is [tex]3\times 10^8\rm m/s[/tex]. Thus, find the value of wavelength using the above formula first,
[tex]\lambda=\dfrac{3\times 10^8\rm}{980\times10^3}\\\lambda=306.122\rm m[/tex]
Suppose the minimum height of the antenna is x meters. As the minimum height of the antenna is 1/2(λ). Thus,
[tex]x=\dfrac{1}{2} \times306.122\\x=153.06[/tex]
Hence, the minimum height (m) of the antenna that WITY (nostalgia radio) must have is 153.06 meters.
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If the Earth and distant stars were stationary (motionless) in space, what would we observe about the wavelength from these stars?
A.Wavelengths measured would match the actual wavelengths emitted.
B.Wavelengths measured would be shorter than the actual wavelengths emitted.
C.Wavelengths measured would be longer than the actual wavelengths emitted.
If a star is moving toward us in space, what would we observe about the wavelength from these stars?
A.Wavelengths measured would be shorter than the actual wavelengths emitted.
B.Wavelengths measured would match the actual wavelengths emitted.
C.Wavelengths measured would be longer than the actual wavelengths emitted.
What is one way you can destroy a magnet’s magnetism? a. by putting it in water b. by cooling it c. by heating it d. by breaking it into pieces
the answer is C LOLOLO
Elements can be broken down through ____ processes.
A. Chemical processes, but not nuclear
B. only biological
C. both chemical and nuclear
D. Nuclear processes, but not chemical
Answer: I believe the answer is: Nuclear processes, but not chemical
Explanation:
A 1.80 m radius playground merry-go-round has a mass of 120 kg and is rotating with an angular velocity of 0.330 rev/s. what is its angular velocity, in rev/s, after a 27.5 kg child gets onto it by grabbing its outer edge? the child is initially at rest.
To find the final angular velocity of the merry-go-round after the child gets on it, we use the conservation of angular momentum. By setting the initial and final angular momenta equal, we can solve for the final angular velocity. The final angular velocity is found to be approximately 0.301 rev/s.
Explanation:To find the angular velocity of the merry-go-round after the child gets on it, we need to consider the conservation of angular momentum. The initial angular momentum of the system is equal to the final angular momentum after the child grabs the outer edge. The initial angular momentum of the system is calculated as the product of the moment of inertia of the merry-go-round and its initial angular velocity. The final angular momentum is calculated as the sum of the moment of inertia of the merry-go-round and the child and the final angular velocity.
Let's denote the initial angular velocity of the merry-go-round as ω1, the final angular velocity as ω2, the moment of inertia of the merry-go-round as I1, the moment of inertia of the child as I2, the radius of the merry-go-round as R, the mass of the merry-go-round as M, and the mass of the child as m.
The initial angular momentum is given by:
L1 = I1 * ω1
And the final angular momentum is given by:
L2 = (I1 + I2) * ω2
Setting the initial and final angular momenta equal, we have:
I1 * ω1 = (I1 + I2) * ω2
Rearranging the equation, we can solve for ω2:
ω2 = (I1 * ω1) / (I1 + I2)
Substituting the given values, we have:
ω2 = (120 kg * (1.80 m)^2 * 0.330 rev/s) / ((120 kg * (1.80 m)^2) + (27.5 kg * (1.80 m)^2))
Simplifying the expression, we can calculate the final angular velocity:
ω2 ≈ 0.301 rev/s
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A car with a mass of 1,500 kilograms is moving around a circular curve at a uniform velocity of 16 m/s. The curve has a radius of 100 meters. What's the centripetal force on the car?
A motorboat, whose speed in still water is 15 km/hour, traveled with the current of a river for 35 km, and against the current for 25 km. the boat took the same time traveling with the current as it did traveling against the current. what is the speed of the current in the river?
Light with a frequency of 7.18 Ã 1014 hz lies in the violet region of the visible spectrum. what is the wavelength of this frequency of light? answer in units of nm.
Which best describes latitude
What best describes Latitude is ; The measure of the angular distance North and south of the equator at zero degrees
What is latitudeLatitude lines are horizontal lines which measures the angular distance north and south of the equator which is set at zero degrees, the latitudes measures the distance between th north pole and the south pole of the earth.
Hence we can conclude that What best describes Latitude is ; The measure of the angular distance North and south of the equator at zero degrees.
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A horizontal pull A pulls two wagons over a horizontal frictionless floor, the first wagon is 500N, the second is 2000 N. The tension in the light horizontal rope connecting the wagons is.
help explain your answer,
Sound waves require a medium to travel through, such as a solid, liquid or gas because A) waves cannot move through a vacuum. B) sound only works within certain pressures. C) waves only work within certain temperatures. D) sound is molecules bumping into one another. Eliminate
D) sound is molecules bumping into one another.
Explanation:
Sound waves are longitudinal waves generated by the vibrations of the molecules of a medium. These oscillations occur in a direction parallel to the direction of propagation of the wave (longitudinal wave), so basically the wave is transmitted by the collisions between the molecules of the medium, and therefore D. is the correct answer. Morevoer, these oscillations create regions of higher density of molecules (called compressions) and regions of lower density of molecules (called rarefactions).