2 points
A rocket accelerates from 50 m/s to 250 m/s in 10 seconds. What is the acceleration of the rocket?
0.04 m/s²
25 m/s²
2500 m/s²
O 20 m/s²
Answers
Answer:
The acceleration of the rocket is 20 m/s².
Explanation:
This can be calculated by dividing the change in velocity by the time it took to achieve that change in velocity. In this case, the change in velocity is 250 m/s - 50 m/s = 200 m/s, and it took 10 seconds, so the acceleration is 200 m/s / 10 s = 20 m/s².
Related Questions
it took 3.5 hours for a train to travel a distance between two cities at a velocity of 120 miles per hour how many miles Live between the two cities
Answers
hope this helps........
according to the most recent data from satellites making precise measurements of the properties of the cosmic background radiation (cbr) the dark energy makes?
Answers
According to the most recent data from satellites making precise measurements of the properties of the cosmic background radiation (CBR), it has been determined that dark energy makes up approximately 68% of the total energy density of the universe.
This means that dark energy is the dominant force driving the acceleration of the expansion of the universe.
The CBR is the afterglow of the Big Bang, and by analyzing its properties, scientists can learn more about the structure and evolution of the universe. The Planck satellite, launched in 2009, has been instrumental in providing high-precision measurements of the CBR and contributing to our understanding of dark energy.
Despite being the dominant force in the universe, dark energy remains a mystery. Its nature and properties are still largely unknown, but it is thought to be a property of space itself rather than a type of matter or energy. Ongoing research and observations will continue to shed light on this elusive phenomenon and deepen our understanding of the universe as a whole.
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define center of gravity
Answers
Answer: a point from which the weight of a body or system may be considered to act. In uniform gravity it is the same as the center of mass.
Explanation:
look it up
As a concerned citizen, you have volunteered to serve on a committee investigating injuries to High School students participating in sports. Currently your committee is investigating the high incidence of arm injuries in cricket bowlers. You think that you've developed a clever way to determine the force of tension in a player's arm while bowling. You're going to assume that the ball is moving in uniform circular motion while being thrown by the bowler, so even though it's not released while at the top of its circular path, you assume it is moving at the same speed at those two points. You measure the length of the bowler's arm to be 78 cm. They release the ball from a height of 2.04 m above the ground. You've set up a slow-motion camera to capture video of the batter hitting the ball. You then use video analysis software to measure the velocities of the ball and bat before and after being hit . Before hitting the ball, the bat is moving at 16.7 m/s, at an angle of 11 degrees above horizontal. Immediately after hitting the ball, it is moving at 12.9 m/s, in the same direction. The bat contacts the ball when the ball is 42 cm above the ground. With the way the camera is set up, you can't get a dear image of the ball before being hit, but you are able to measure that after being hit it is moving at 20,1 m/s, at an angle of 39 degrees above horizontal. You've measured the mass of the ball to be 0.16 kg, and the bat has a mass of 1.19 kg. In a previous experiment, you determined that the average amount of energy the ball loses to the environment on its way from the bowler to the batter (due to interactions with the air and the ground when bouncing) is 36). a) What is the speed of the ball just before striking the bat? b) At what speed is the ball moving when released by the bowler? (hint: use an energy analysis) c) What is the force of tension in the bowler's arm if they release the ball at the top of their swing?
Answers
a) The speed of the ball just before striking the bat is equal to the horizontal component of the final velocity: Speed of ball = |v2 * cos(39°)|.
b) The speed of the ball when released by the bowler is given by: Speed of ball = √(2 * g * h), where g is the acceleration due to gravity and h is the height of release.
c) The force of tension in the bowler's arm when releasing the ball at the top of their swing is determined by the centripetal force: Force of tension = m * v^2 / r, where m is the mass of the ball, v is the speed of the ball when released, and r is the length of the bowler's arm.
a) To determine the speed of the ball just before striking the bat, we can analyze the velocities of the bat and the ball before and after the collision. From the information provided, the initial velocity of the bat (v1) is 16.7 m/s at an angle of 11 degrees above horizontal, and the final velocity of the ball (v2) after being hit is 20.1 m/s at an angle of 39 degrees above horizontal.
To find the speed of the ball just before striking the bat, we need to consider the horizontal component of the velocities. The horizontal component of the initial velocity of the bat (v1x) is given by v1x = v1 * cos(11°), and the horizontal component of the final velocity of the ball (v2x) is given by v2x = v2 * cos(39°).
Since the ball and bat are assumed to be in the same direction, the horizontal component of the ball's velocity just before striking the bat is equal to v2x. Therefore, the speed of the ball just before striking the bat is:
Speed of ball = |v2x| = |v2 * cos(39°)|
b) To determine the speed of the ball when released by the bowler, we can use an energy analysis. The energy of the ball consists of its kinetic energy (K) and potential energy (U). Assuming the ball is released from a height of 2.04 m above the ground, its initial potential energy is m * g * h, where m is the mass of the ball, g is the acceleration due to gravity (approximately 9.8 m/s²), and h is the height.
At the point of release, the ball has no kinetic energy, so all of its initial potential energy is converted to kinetic energy when it reaches the bottom of its circular path. Therefore, we have:
m * g * h = 1/2 * m * v^2
Solving for the speed of the ball (v), we get:
Speed of ball = √(2 * g * h)
c) To determine the force of tension in the bowler's arm when they release the ball at the top of their swing, we need to consider the centripetal force acting on the ball as it moves in a circular path. The centripetal force is provided by the tension in the bowler's arm.
The centripetal force (Fc) is given by Fc = m * v^2 / r, where m is the mass of the ball, v is the speed of the ball when released, and r is the radius of the circular path (equal to the length of the bowler's arm).
Therefore, the force of tension in the bowler's arm is equal to the centripetal force:
Force of tension = Fc = m * v^2 / r
By substituting the known values of mass (m), speed (v), and the length of the bowler's arm (r), we can calculate the force of tension in the bowler's arm.
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the objective that has 10x stamped on the casing is in alignment. what is the total magnification of the specimen?
Answers
If the object with 10x stamped on the casing is aligned, the specimen's total magnification is 100x.
How does 10X in a microscope translate?We all understand that 10X refers to the objective lens's effective magnification, which is ten times life size. When paired with a 10X ocular lens in a compound, this results in a final magnification of 100X. (10 X 10).
How much more magnification are 10X and 10X overall?The sum of the magnifications from the two lens systems is the overall magnification. As a result, the 10X objective and 10X ocular lenses on the microscope would magnify the object by 10 x 10 or 100 times.
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What is the conversation of energy
Answers
Answer:
The conservation of energy is a principle where according to which the energy of interacting bodies or particles in a closed system remains constant.
Explanation:
Answer:
a principle stating that energy cannot be created or destroyed, but can be altered from one form to another.
Mrs. Byers is swinging a mass on a string above her head with a radius of 7 m. If she decreases the radius by a factor of 7, by what factor does the centripetal acceleration change?
Answers
Answer:
Explanation:
Given:
V₁ = V₂ = V
R₁ = 7 m
n = 7
R₂ = R₁ / n = 7 / 7 = 1 m
____________
aₙ₂ / aₙ₁ - ?
aₙ₁ = V₁² / R₁ = V² / 7
aₙ₂ = V₂² / R₂ = V² / 1 = V²
aₙ₂ / aₙ₁- = V² / (V²/7) = 7
Centripetal acceleration increased by 7 times
4. A bullet of mass 30 g is fired from a rifle of mass 5kg at a speed of 259m/s.
a) What is the momentum of the rifle just after the bullet is fired?
b) What is the recoil velocity of the rifle?
Answers
Answer:
Rifle Momentum=7.77kg*m/s v'= 1.554 m/s
Explanation:
a) m1v1 + m2v2 = m1v1' + m2v2'
0+0 = 0.03*259 + P(rifle momentum)
solve for P
p= 7.77kg*m/s
b) 7.77= 5*v'
v'= 1.554 m/s
The momentum of the rifle just after the bullet is fired is 7.77 kg.m/s and the recoil velocity of the rifle at the time of firing is 1.554 m/s.
What is momentum?
Momentum of a particle is the product of the mass of the particle and its velocity. Momentum is a vector quantity. It has both the magnitude and direction of motion. According to the Newton's second law of motion, the rate of change of the momentum is equal to the force acting on the particle which is in motion.
Momentum can be calculated by the general formula
p = m.v
where, p = momentum of the particle,
m = mass of the particle,
v = velocity of the particle.
Rifle Momentum= mass × velocity
P = m × v'
a) m1v1 + m2v2 = m1v1' + m2v2'
0+0 = 0.03 × 259 + P(rifle momentum)
0 = 7.77 + P
P = 7.77kg.m/s
b) p = m × v
7.77= 5 × v'
v'= 1.554 m/s
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Which physical of aluminum allows it to be formed into thin sheets?
OA. electrical conductivity
OB. malleability
OC. density
OD. thermal conductivity
Answers
Answer:
OD. thermal conductivity
Explanation:
Answer:
C density that's what I thing at least
Consider optical absorption. Mark the correct statement(s). Absorption can only occur if the photon energy is larger than the energy gap of a semiconductor. Absorption can only occur if the photon energy is less than the energy gap of a semiconductor. Absorption is strongest if the photon energy matches the energy difference between the centers of the valence and conduction band. Absorption is strongest if the photon energy matches the energy difference between the band edges of valence and conduction band.
Answers
Consider optical absorption, the correct statement is that a. absorption can only occur if the photon energy is larger than the energy gap of a semiconductor.
This is because when a photon with sufficient energy interacts with a semiconductor material, it can excite an electron from the valence band to the conduction band, creating an electron-hole pair. The photon must have energy equal to or greater than the bandgap energy for this process to occur. If the photon energy is less than the energy gap, it cannot excite the electron, and absorption will not take place.
Additionally, absorption is strongest when the photon energy matches the energy difference between the band edges of the valence and conduction bands, this is due to the density of available states for the electron to occupy, as it is more likely to find an empty state to transition into at the band edges. As the photon energy matches this energy difference, the probability of absorption increases, leading to stronger absorption in the semiconductor material. So therefore in optical absorption, a. absorption can only occur if the photon energy is larger than the energy gap of a semiconductor. is the correct statement.
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A ladder (ℓL = 7.80 m) of weight WL = 350 N leans against a smooth vertical wall. The term "smooth" means that the wall can exert only a normal force directed perpendicular to the wall and cannot exert a frictional force parallel to it. A firefighter, whose weight is 885 N, stands 6.40 m up from the bottom of the ladder (this distance goes along the ladder, it is not the vertical height). Assume that the ladder's weight acts at the ladder's center, and neglect the hose's weight. What is the minimum value for the coefficient of static friction between the ladder and the ground, so that the ladder (with the fireman on it) does not slip? (Assume = 54.0°.)
Answers
Answer: In order for the ladder (with the firefighter on it) to not slip against the ground, the friction between the ladder and the ground must provide enough horizontal force to prevent the ladder from sliding horizontally. The minimum value of the coefficient of static friction between the ladder and the ground can be calculated using the following steps:
Step 1: Identify the forces acting on the ladder.
The forces acting on the ladder are the weight of the ladder (WL) acting downward at the center of the ladder, the weight of the firefighter (Wf) acting downward at a distance of 6.40 m up from the bottom of the ladder, the normal force (N) exerted by the ground acting perpendicular to the ground, and the frictional force (f) acting horizontally in the direction opposite to the potential sliding motion of the ladder.
Step 2: Write down the equations for force equilibrium.
In the vertical direction, the sum of the vertical forces must be zero:
N + Wf - WL = 0
In the horizontal direction, the sum of the horizontal forces must be zero:
f = 0 (since there is no horizontal acceleration)
Step 3: Express the forces in terms of known quantities.
WL = 350 N (given)
Wf = 885 N (given)
The angle of inclination of the ladder with respect to the ground is given as 54.0°.
Step 4: Calculate the normal force N.
Using the vertical force equilibrium equation, we can solve for N:
N = WL - Wf = 350 N - 885 N = -535 N (negative sign indicates that N acts in the opposite direction of WL and Wf)
Step 5: Calculate the frictional force f.
Since the ladder is on the verge of slipping, the frictional force f will be at its maximum value, which is given by:
f = μN, where μ is the coefficient of static friction.
Step 6: Calculate the coefficient of static friction μ.
Using the calculated value of N, we can now calculate μ:
μ = f / N = (-535 N) / N = -535
Step 7: Determine the minimum value of μ.
The coefficient of static friction cannot be negative, as it is always non-negative in reality. Therefore, the minimum value of the coefficient of static friction between the ladder and the ground is 0, which means that the ladder must have sufficient friction with the ground to prevent slipping.
In conclusion, the minimum value for the coefficient of static friction between the ladder and the ground, so that the ladder (with the firefighter on it) does not slip, is 0.
8. An example of muscular endurance is:
A. Sit and Reach
B. Push Up
C. 100 meter sprint
D. None Of The Above
Answers
Suppose that the separation between speakers A and B is 5.00 m and the speakers are vibrating in phase. They are playing identical 125-Hz tones, and the speed of sound is 343 m/s. What is the largest possible distance between speaker B and the observer at C, such that he observes destructive interference?
Answers
The largest possible distance between speaker B and the observer at C is 1.37 m.
Largest possible distance between the observer and speaker B
The largest possible distance between speaker B and the observer at C occurs when the difference in travel distances is just one half wavelength.
λ = v/f
λ = (343)/125
λ = 2.744
¹/₂λ = ¹/₂(2.744) = 1.37 m
Thus, the largest possible distance between speaker B and the observer at C is 1.37 m.
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Consider a certain object A. Which of the following is an example of its internal energy?
A. Energy of a second object in thermal contact with object A
B. Elastic energy due to stretched bonds between different parts of object A
C. Energy due to the magnetic forces exerted on each part of object A
D. Energy due to the electric forces exerted on each part of object A
Answers
Consider a certain object A, the following is an example of its internal energy is B. Elastic energy due to stretched bonds between different parts of object A
Internal energy is the sum of the kinetic and potential energy of the particles that make up an object. Internal energy is therefore a property of the object that depends on the internal state of its constituent particles. Elastic energy due to stretched bonds between different parts of object A is an example of its internal energy. Internal energy is a property of a system, which is the sum of the kinetic and potential energies of the molecules that make up the system.
It's a result of the motion of particles within a system that is not related to the motion of the system as a whole. Internal energy of an object is the total of its kinetic energy, potential energy, and internal potential energy. Therefore, Elastic energy due to stretched bonds between different parts of object A is an example of its internal energy. In conclusion, Elastic energy due to stretched bonds between different parts of object A is an example of its internal energy, so the correct answer is B. Elastic energy due to stretched bonds between different parts of object A
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A train accelerates from 23m/s to 190m/s in 54 seconds. What was its acceleration?
Answers
Answer:
Use the method on the image and solve it.
The train is accelerating with an initial velocity of 23 m/s, a final velocity of 190 m/s in the time period of 54 seconds, then the acceleration will be 3.09 m/s².
What is velocity?Velocity is the measurement of a particle's or object's displacement with relation to time. The recognized unit of magnitude for velocity is the meter per second (m/s) (also known as speed).
There are several ways to show a velocity vector's direction, depending on how many dimensions are provided.
The given values in the question are,
Initial velocity, u = 23 m/s
Final velocity, v = 190 m/s and,
Time, t =54 seconds.
By putting the formula of the equation of motion :
v = u + at
190 = 23 + (a)(54)
a = 167/54
a = 3.09 m/s².
Hence, the acceleration of the train is equal to 3.09 m/s².
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A river flows north at 4 miles per second and a boy swims straight across it at 2 miles per second is the river is 8 miles wide how far will the boy be from his starting point after crossing the river
Answers
Answer:
16 miles (with the crazy number units given)
Explanation:
Find out how long it takes to swim across....use this time times the flow rate to see how far downstream he travels.....before he goes over the dam!
2 miles per second ??? VERY fast ( that is 7200 mph)
8 miles / 2 miles/sec = 4 seconds to swim across
river flow is 4 miles per second <=======extremely fast!!
4 mi/sec * 4 s = 16 miles
What is the force of gravity on a 10kg rock on Earth?
Answers
The force of gravity is 98 N
The force is determined to be the amount of energy that a rock exerts. This force can be of different types. One such type is the force of gravity. It is the force applied by the rock on the earth in presence of gravity on the earth.
While calculating the force of gravity, the force is applied downwards towards the direction of the earth and this sometimes is called as the scientific weight of an rock.
It is calculated by the product of gravitational acceleration and the mass.
Given,
Mass = 10 kg
Gravitational acceleration(g) = 9.8
Force = mg
Force = 10 * 9.8
Force = 98 N
Therefore, the force of gravity of the rock having a mass of 10 kg is 98 N.
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Two worlds in the outer solar system that seem remarkably similar to each other are:
Answers
Two worlds in the outer solar system that seem remarkably similar to each other are: Triton and Pluto
The outer solar system comprises the next four planets and everything beyond the planet Neptune but within the gravitational pull of the Sun. The Kuiper Belt and the Oort Cloud are also parts of the outer region.
Triton is only slightly larger than Pluto. Both worlds have similar surface materials, such as nitrogen, methane and carbon monoxide. Their diameters, masses and densities are also similar. Both Triton and Pluto may also have originated within the Kuiper Belt. Triton is thought to be originally a Kuiper Belt Object that was captured by Neptune's gravity.
Because Triton and Charon-Pluto are both from the Kuiper belt they are both made of similar materials such as nitrogen, methane, carbon dioxide and water ice. Both have large cores that are made primarily of rock with mantles of water ice and crusts made of frozen nitrogen. Neither of them have a magnetic field.
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Astronomers believe that the mergers of smaller galaxies can trigger the formation of
Answers
Astronomers believe that the mergers of smaller galaxies can trigger the formation of larger galaxies and active galactic nuclei (AGN).
When smaller galaxies merge, their stars, gas, and dark matter combine, creating a larger and more massive galaxy. This process also often leads to an increase in star formation, as the colliding gas clouds create regions of high density, which are conducive to the birth of new stars.
Additionally, the merger can cause gas and dust to accumulate in the central region of the new galaxy, leading to the formation of an active galactic nucleus (AGN). This AGN consists of a supermassive black hole surrounded by an accretion disk of gas, which emits high amounts of energy as the gas spirals into the black hole.
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If a moving object is 75% kinetic energy how much potential energy does it have?
Answers
Answer:
the ebergy
Explanation:
energy does it have if a miving object
What is the charge of an ionic compound after an ionic bond is formed?
Answers
Answer:
Ionic bonds are formed between cation and anions . A cation is formed when a metal ion loses valence electron while an anion is formed when a non-metal gains a valence electron.
Which phrase describes the composition of the outer planets?
are gaseous
contain water
have high densities
are made mostly of liquidlanets.
Answers
The phrase that describes the composition of the outer planets is 'are gaseous'. That is option A.
What is a planet?A planet is defined as the astronomical object that has enough gravity that causes it to revolve round about the sun.
There are various types of planet and they include the following:
MercuryVenusEarth. Mars. Jupiter. Saturn. Uranus. Neptune.Each planet is made up of and inner and outer geographical environment which in turn bears various unique characteristics.Most outer planets are made up of gaseous contents.
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how has evidence changed our views on the universe
Answers
Answer:
We found out more about how the universe had started (Big Bang theory), how the planets were created and how stars are born.
Shawn is walking two dogs; Walter and Rosie. Rosie is pulling straight ahead with a force of 31 N. Suddenly Walter sees a squirrel and starts pulling directly to the side with a force of 186 N. How hard must Shawn pull to resist the combined forces of the two dogs? Give your answer to one decimal place.
Answers
Shawn needs to exert a force of approximately 188.46 N to resist the combined forces of the two dogs, Walter and Rosie. The forces of Rosie and Walter, which are 31 N and 186 N respectively, are perpendicular to each other. By using the Pythagorean theorem, the resultant force can be calculated.
In the given question, Shawn is walking two dogs named Walter and Rosie. While walking, Rosie pulls straight ahead with a force of 31 N. However, Walter sees a squirrel and starts pulling directly to the side with a force of 186 N.
According to the question, the force of Rosie is 31 N and Walter is 186 N.
Now, to find out the resultant force acting on Shawn, we can use Pythagorean theorem as both forces act perpendicular to each other.
R² = P² + Q²Here, R = the resultant force which is to be determined.
P is the force of Rosie which is 31 N and Q is the force of Walter which is 186 N.
Hence, the equation becomes:
R² = 31² + 186²R² = 961 + 34596R² = 35557R = √35557R = 188.46 N (approximately)
Therefore, the force with which Shawn must pull to resist the combined forces of the two dogs is 188.46 N.
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I am riding my bike at 25 m/s, I start to slow down at a rate of -4 m/s2. I slow down for 5 seconds... what is my final velocity?
Answers
The final speed of the bike is 5 m/s.
What is velocity?Speed is measured as the ratio of distance to the time in which the distance was covered.
To calculate the final velocity, we use the formula below.
Formula:
v = u+at................ Equation 1
Where:
v = Final velocityu = Initial velocitya = Accelerationt = Time.From the question,
Given:
u = 25 m/sa = -4 m/s²t = 5 secondsSubstitute these values into equation 1
v = 25+(-4×5)v = 25-20v = 5 m/sHence, the final speed of the bike is 5 m/s.
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What is an inclined plane that is wrapped in spiral
Answers
Answer:
A screw
Explanation:
The threads of a screw act like an inclined plane to increase the distance over which you exert the input force.
Hola!!!
what is meant by Multiverse???
.
.
.
.
.
.
.
anyone here??
Answers
Explanation:
group of multiple universes
these universes comprise everything that exists: the entirety of space, time, matter, energy, information, and the physical laws and constants that describe them.
Define weight
Please help!!Thanks!!
Answers
Answer:
in science and engineering , the weight of an object is the force acting on the object due to gravity.
At a drag race, a jet car travels 1/4 mile in 5.2 seconds. What is the final speed of the
car and its acceleration?
Answers
Answer:
1609.3
Explanation:
help me please!! in a stankey diagram, what does the thickness of the lines represent?
Answers
Answer: The thickness of the vertical flow lines indicates the relative quantity.
The thickness of the vertical flow lines indicates the relative quantity.
What is vertical flow?A vertical flow constructed wetland is a planted filter bed that is drained at the bottom. Wastewater is poured or dosed onto the surface from above using a mechanical dosing system. The water flows vertically down through the filter matrix to the bottom of the basin where it is collected in a drainage pipe.Vertical flow immunoassays rely on the same basic principles as the more common lateral flow immunoassay format with some modifications. The most apparent difference between the two methods being the vertical and lateral flow of fluid. However, vertical flow technology has several advantages over traditional lateral flow assays with the most significant being the reduced assay time (<5 minutes), table I.To learn more about vertical flow refer to:
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