Answer:
[tex]a_c = 3.92 m/s^2[/tex]
Explanation:
tangential speed of the girl is given as
[tex]v_t = 2.8 m/s[/tex]
diameter of the circle is given as
[tex]d = 4.0 m[/tex]
so here the radius of the circle is given as
[tex]R = 2.0 m[/tex]
now we know that centripetal acceleration of the object moving in circle is given as
[tex]a_c = \frac{v^2}{R}[/tex]
[tex]a_c = \frac{2.8^2}{2}[/tex]
[tex]a_c = 3.92 m/s^2[/tex]
A car initially traveling at a speed of 16 meters per second accelerates uniformly to a speed of 20 meters per second over a distance of 36 meters. what is the magnitude of the car's acceleration?
The formula for calculating acceleration can be derived from:
v^2 = v0^2 + 2 a d
where a is acceleration, v is final velocity, v0 is initial velocity and d is distance
Rewriting in terms of a:
a = (v^2 – v0^2) / 2 d
a = (20^2 – 16^2) / (2 * 36)
a = 2 m/s^2
The magnitude of the car's acceleration is
[tex]\rm 2\;m/sec^2[/tex]
Step by Step Solution :
Given :
Final Speed, v = 20 m/sec
Initial Speed, u = 16 m/sec
Distance Covered, s = 36 m
Calculation :
We know that,
[tex]\rm v^2-u^2=2as[/tex] --- (1)
Now from equation (1),
[tex]20^2-16^2=2\times a\times 36[/tex]
[tex]a =\dfrac{20^2-16^2}{2\times36}[/tex]
[tex]\rm a = 2 \; m/sec^2[/tex]
The magnitude of the car's acceleration is
[tex]\rm 2\;m/sec^2[/tex]
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The magnitude of the electrical force acting between a +2.4 × 10–8 C charge and a +1.8 × 10–6 C charge that are separated by 0.008 m is N, rounded to the tenths place.
A model rocket flies horizontally off the edge of a cliff at a velocity of 50.0 m/s. If the canyon below is 100.0 m deep, how far from the edge of the cliff does the model rocket land?
First calculate for the time it takes for the model rocket to reach the land. Using the formula:
h = vi t + 0.5 g t^2
where h is height = 100 m, vi is initial vertical velocity = 0 since it simply dropped, t is time = ?, g = 9.8 m/s^2
100 = 0.5 (9.8) t^2
t = 4.52 seconds
So the total horizontal distance taken is:
d = 50 m/s * 4.52 s
d = 225.90 m
The distance from the edge of the cliff where the model rocket will land is ; 225.90 m
Using the given data :
Velocity of rocket = 50.0 m/s
Depth of canyon ( H ) = 100 m deep
Initial velocity ( vi ) = 0
To determine how far from the edge of the cliff does the model rocket land
H = vi( t ) + 0.5gt²
100 = 0.5*(9.8)*t²
∴ t = 4.52 secs
Velocity = horizontal distance / time
∴ distance ( horizontal distance ) = velocity * time
distance = 50 m/s * 4.52 secs = 225.90 m
Hence we can conclude that The distance from the edge of the cliff where the model rocket will land is ; 225.90 m .
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The mass of a basketball is three times greater then the mass of a softball. Compare the momentum’s of a softball and a basketball if they both are moving at the same velocity.
Final answer:
Momentum depends on mass and velocity, and in this scenario, the basketball will have three times more momentum than the softball despite moving at the same velocity. Understanding momentum is key in analyzing the effects of collisions and interactions involving objects of different masses and velocities.
Explanation:
Momentum is a measure of how hard it is to stop an object and depends on both mass and velocity. The momentum of an object (p) is given by the product of its mass (m) and velocity (V): p = mV. In the given scenario, if a basketball has three times greater mass than a softball but both are moving at the same velocity, the basketball will have three times more momentum compared to the softball.
This difference in momentum reflects the impact a player with a greater mass but the same velocity can have in collisions, as momentum is crucial in determining the effect of such interactions. Therefore, if the mass of the softball is m, and the velocity of both the softball and basketball is v, then the momentum of the softball will be m × v and the momentum of the basketball will be 3m × v, which is three times greater than that of the softball.
A truck travels up a hill with a 7.9 ◦ incline. the truck has a constant speed of 25 m/s. what is the horizontal component of the truck's velocity? answer in units of m/s.
The amount Of Kinetic energy an object has depends on its?
A. Motion
B. Position
C. Gravity
D. Height
If a fly sits halfway between the axis and the edge of a rotating phonograph turntable, what happens to its tangential speed when the RPM is tripled?
Answer:
Tripled
Explanation:
The relation between the tangential speed and the angular speed is given by
v = r ω
where, r is the radius of the circular path and ω be the angular velocity
As we know that
ω = 2π f
Where, f is the frequency of rotation in rpm
So, v = 2π f r
As the RPM becomes tripled, the tangential velocity is also tripled.
I really need help! Please no one has helped me! Will give BRAINLIEST, THANKS, and RATE!! Please help if you are good at science and HURRY PLEASE!!!
How does the law of conservation of mass apply to this reaction: C2H4 + 3O2 --> 2H2O + 2CO2?
A.Only the oxygen needs to be balanced
B. The equation needs to be balanced. There are fewer oxygen atoms in the equation than hydrogen and carbon
C.The law of conservation of mass has already been applied
D. Each element needs to be balanced
It is "c", and i hope it's correct. please pm me, if you need more help
How did scientists determine the age of the ocean floor?
The prefix milli- means one thousandth, or 10 –3 . how many milliseconds (ms) are in 6.7 seconds?
Venus has about 80 percent of earth's mass and about 95 percent of earth's radius. your weight on venus will be
A storm is moving east towards your house at an average speed of 35 km/hr. If the storm is currently 80 kilometers from your house in how much time do you expect it to arrive
Mechanical waves require a ____________ to travel through but electromagnetic waves can travel through empty space.
300,000 kilo
your welcome
Chemical reactions with metals may create some interesting results such as precipitate. What is precipitate?
A- a solid that forms when two liquids are mixed
B- a solid that forms when two gases are mixed
C- a gas that forms when two liquids are mixed
D- a liquid that forms when two solids are mixed
Answer:
TITE
Explanation:
When a comet passes near the sun, part of it takes on the appearance of a large, bright ball from which the tail extends. this part is called _________?
When changing the direction that the ambulance is traveling, the force that causes everything in the ambulance to shift in the direction it was just moving is called?
a group of cells that grow very fast
Answer:
Cancer
Explanation:
You are on an elevator that is plummeting toward the ground at 30 m/s and you jump up right before it hits the ground. you jump upward with a velocity of 5 m/s. at what speed do you hit the ground?
Determine the energy in joules of a photon whose frequency is 3.55 x10^17 hz
Planck's equation can be used as a formula to determine the energy of a photon. In this problem, given the frequency and using 6.63 x 10^-34 J.s as Planck's constant, the energy can be calculated. This Physics concept is useful in understanding the energy-frequency relationship of photons.
Explanation:Solution
To calculate the energy of a photon, we can use the Planck's equation E = hv, where 'E' is the energy of the photon, 'h' is the Planck's constant and 'v' is the frequency of the photon.
In this case, the frequency of the photon 'v' is given as 3.55 x 10^17 Hz and Planck's constant 'h' is a universally accepted constant which is 6.63 x 10^-34 J.s. Substituting these values into Planck's equation we get:
E = 6.63 x 10^-34 J.s x 3.55 x10^17 Hz
Upon calculating, the energy in Joules of the photon can be found.
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As police car with a blaring siren driver away from you while are on standing near intersection, the frequency of the siren is _____therefore, the pitch of the siren is _____.
A) lower, lower B) lower, higher C) higher, louder D) higher, lower E) higher, higher
What is the relationship between color and wavelength for light?
Color is the frequency of the light and wavelength is the speed of that light. Depending on the color it will have a higher frequency and a smaller wavelength while another will have a lower frequency and a longer wavelength so that the colors will even out. Hope this helps.
The color of light is determined by its wavelength. In the visible light spectrum, longer wavelengths are perceived as red, while shorter wavelengths are perceived as blue or violet. This is evident in phenomena like rainbows.
Explanation:The relationship between color and wavelength for light is that the color of light that we perceive is determined by the wavelength of the light. In the visible light spectrum, each color corresponds to a different range of wavelengths. For instance, red light has longer wavelengths (about 700 nM to 635 nM), whereas blue or violet light has shorter wavelengths (around 450 nM to 400 nM). This is why when we see a rainbow, it is a gradation of colors from red (long wavelength) at the top to violet (short wavelength) at the bottom. This happens because of the refraction and dispersion of light in droplets of water.
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Every action has an equal and opposite reaction meaning
in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
The first scientist to be credited for postulating that earth circled the sun was
How to find acceleration when given distance and velocity?
To find acceleration using velocity and distance, use the kinematic equation v² = vo² + 2a(d − do). If the object starts from rest, rearrange the equation to solve for acceleration: a = (v² - vo²)/2d. Keep in mind that this approach assumes constant acceleration and ignores forces such as air resistance and friction.
Explanation:To find acceleration when given distance and velocity, you can use physics' kinematic equations that relate displacement, velocity, acceleration, and time. One of these equations is v² = vo² + 2a(d − do), where v is the final velocity, vo is the initial velocity, a is the acceleration, and d is the displacement or distance.
First, to find acceleration (a), you have to ensure that the initial velocity (vo) is zero (when the object starts from rest). After this, rearrange the equation to solve for acceleration: a = (v² - vo²)/(2d). This will help you find the acceleration when you plug in your given final velocity (v) and distance (d).
Note: This method assumes a constant acceleration and does not consider forces like friction or air resistance. It's fundamental to consider this when dealing with real-world problems.
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Which of the following most likely has neither a fixed shape nor a fixed volume?
A) neon gas
B) solid copper
C) liquid nitrogen
D) liquid Mercury
A circle has an initial radius of 50ft when the radius begins decreasing at a rate of 2ft/s. what is the rate of change of the area at the instant the radius is 10ft?
The rate of change of the area of a circle with a decreasing radius at the instant the radius is 10ft, is -40π ft²/s.
Explanation:The subject of this question seems to be about the concept of rate of change specifically dealing with the changing area of a circle given a decreasing radius. The circle's area is defined by the equation A = πr². We are told the radius is decreasing at a rate of 2ft/s. To find the rate of change of the area, we can use the formula for the derivative of the circle's area with respect to time, which is dA/dt = 2πr(dr/dt). Plugging in 10 for the radius (r) and -2 for dr/dt (since the radius is decreasing), we get dA/dt = 2π*10*(-2) = -40π ft²/s. So, at the instant the radius is 10ft, the area is decreasing at a rate of 40π ft²/s.
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The rate of change of the area of a circle at the instant the radius is 10ft, while the radius is decreasing at 2ft/s, is -40π ft²/s or putting π = 3.14 we get -125.6 ft²/s.
The question is asking for the rate of change of the area of a circle when the radius is decreasing at a constant rate. Since the area of a circle is defined by the equation A = πr² , where A is the area and r is the radius, we use calculus to find the rate of change of the area with respect to time ([tex]\frac{dA}{dt}[/tex]).
When the radius r is 10ft, the derivative of the area with respect to the radius ([tex]\frac{dA}{dt}[/tex]) is 2πr.
Since the question states that the radius is decreasing at a rate of 2ft/s, we have :
[tex]\frac{dr}{dt}[/tex] = -2ft/s.
Using the chain rule, we can find the rate of change of the area by multiplying these two rates:
[tex]\frac{dA}{dt}[/tex] = [tex]\frac{dA}{dr}[/tex] x [tex]\frac{dr}{dt}[/tex].
So at r = 10ft,
[tex]\frac{dA}{dt}[/tex] = 2π x 10ft x -2ft/s,
or, [tex]\frac{dA}{dt}[/tex] = -40π ft²/s .
putting π = 3.14 we get
[tex]\frac{dA}{dt}[/tex] = -125.6 ft²/s.
When is an object moving in uniform circular motion?
A. when it speeds up around a curve
B. when its tangential speed is constant
C. when it has no net force acting on it
D. when its acceleration is tangent to a circle
Answer:
B:when its tangential speed is constant
Although the speed of an object that has a uniform circular motion is constant, its velocity is not constant. Not only that, but it is actually changing constantly.
If you placed a negatively charged object within this electric field, which direction will it move?
Answer:to the right
Explanation:
A.
You are standing in a moving bus, facing forward, and you suddenly move forward as the bus comes to an immediate stop. what force caused you to move forward?
When a 40-n force, parallel to the incline and directed up the incline, is applied to a crate on a frictionless incline that is 30 above the horizontal, the acceleration of the crate is 2.0 m/s2 , up the incline. the mass of the crate is:?
To find the mass of the crate on a frictionless incline with a known force and acceleration, use Newton's second law. The mass is calculated as 40 N divided by 2.0 m/s^2, resulting in 20 kg.
Explanation:To determine the mass of the crate on an incline, you can use Newton's second law of motion, which is F = ma, where F is the force, m is the mass, and a is the acceleration. In this case, we know the force applied up the incline (40 N), the acceleration of the crate (2.0 m/s2), and we need to determine the mass m. The equation can be rearranged to solve for mass by dividing both sides by acceleration, resulting in m = F/a. Thus, dividing the force by the acceleration, you get m = 40 N / 2.0 m/s2 = 20 kg. So, the mass of the crate is 20 kilograms.