When a rigid body rotates about a fixed axis, all the points in the body have the same ___
A. 1: Tangential speed. B. 2: angular acceleration. C. 3: tangential acceleration. D. 4: linear displacement. E. 5: centripetal acceleration.
Answers
When a rigid body rotates about a fixed axis, all the points in the body have the same tangential speed.
Explanation:
Tangential speed is the linear speed of an object moving along a circular path. The centripetal force is the force that acts on an object moving in a circular path and is directed toward the center of the circle. Centripetal force and tangential speed are related to each other.
The centripetal force acting on an object is proportional to the square of its tangential speed. However, the given question, asks for the property that is the same for all the points in the rigid body. All the points in a rigid body rotating about a fixed axis have the same tangential speed. This is because all points in the rigid body move along the same circular path at the same angular speed. Hence, the correct option is 1: tangential speed.
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Related Questions
60.0 kg downhill skier is moving with a speed of 10.0 m/s as she starts her descent from a level plateau at 150.0 meters of height above the base of the slope below. The length of the slope is 650 meters. There is a frictional force of 70 N affecting the skier's motion while she coasts the entire descent without using her poles. Upon reaching the bottom she continues to coast to a stop. How much kinetic energy will she have at the bottom of the hill?
Answers
Answer:
She will have kinetic energy at the bottom of the hill=45700 J
Explanation:
We are given that
Mass, m=60 kg
Speed, v=10 m/s
Height, h=150 m
Length of slope, d=650 m
Frictional force, f=70 N
We have to find the kinetic energy she will have at the bottom of the hill.
Kinetic energy at the bottom of the hill
=Initial kinetic energy+ mgh-fd
Substitute the values
Kinetic energy at the bottom of the hill
=\(\frac{1}{2}(60)(10)^2+60\times 9.8\times 150-70\times 650\)
=\(45700J\)
Hence, she will have kinetic energy at the bottom of the hill=45700 J
If your initial speed was 15 m/s , and you were heading due west, what was your average velocity during braking
Answers
Answer:
Your average velocity would be 20 m/s.
Explanation:
hope this helped!
Explain how motion is relative
Answers
Answer:
it's always relative because it's measured or observed with respect to another thing
Explanation:
do you understand?
Calculate the kinetic energy of a 5.0kg object moving at 4.0 m/s
Answers
Answer:
The answer is
40 JExplanation:
The kinetic energy of an object given it's mass and velocity can be found by using the formula
\(KE = \frac{1}{2} m {v}^{2} \)
where
m is the mass
v is the velocity
From the question
m = 5 kg
v = 4 m/s
The kinetic energy is
\(KE = \frac{1}{2} \times 5 \times {4}^{2} \\ = \frac{1}{2} \times 5 \times 16 \\ = 5 \times 8\)
We have the final answer as
40 JHope this helps you
what happens the second time dr. hewitt lifts the bowling ball near his teeth and gives it a push?
Answers
The second time Dr. Hewitt lifts the bowling ball near his teeth and gives it a push, the same forces are at play as the first time he did so. When he lifts the ball, he exerts an upward force equal to the weight of the ball to overcome gravity.
When he gives it a push, he applies a forward force to the ball. The friction between the ball and the ground opposes the motion of the ball, but eventually, the ball starts moving forward.
Assuming Dr. Hewitt applies the same amount of force, the ball will move at the same speed and cover the same distance as the first time. However, if he applies more force or pushes it in a different direction, the ball's speed and direction will change.
It is important to note that repeatedly lifting heavy objects near one's teeth can be dangerous, as it can strain the neck and back muscles and cause injury. It is best to use proper lifting techniques and seek assistance when handling heavy objects.
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A spaceship with a constant speed of 0. 800c relative to earth travels to a star that is 4. 30 light-years from earth. how much time for this trip would elapse on a clock on board the spaceship?
Answers
The answer is time for this trip would elapse on a clock on board the spaceship is \(1.02 \times 10^{8} secends\)
\(V_{0}=0.800 \mathrm{C}\)
Distance from Earth (x)=4.30 light-years
Time req. to do in earth frame of reference \($=\frac{4.30 \text { light years }}{0.800 \mathrm{c}}$\)
\($=\frac{4.3 \times 9.46 \times 10^{15} \mathrm{M}}{0.8 \times 3 \times 10^{8} \mathrm{~m} / \mathrm{s}}$\)
\($=1.695 \times 10^{8}$\) seconds
proper time = Time in earth's reference\($\sqrt{1-\frac{v^{2}}{C^{2}}}$\)
\(=1.698 \times 10^{8} \times 0.6=1.02 \times 10^{8} secends\)
What is Space contraction?
The contraction of space is a notion presented in spatial relativity in which an object's distance travelled when moving at a percentage of the speed of light is smaller than that measured by an observer in an inertial reference frame \(\mathrm{x}_{0}=\mathrm{x} \times \sqrt{1-\frac{\mathrm{v}^{2}}{\mathrm{c}^{2}}}\)Lorentz-FitzGerald contraction, also known as space contraction, is the shortening of an object in the direction of its motion relative to an observer in relativity physics.To learn more about Space contraction visit:
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Work is done when force is applied ____________________________________________?
Question options:
A. for a long period of time
B. in the opposite direction
C. in the same direction that the object moves
D. none of the above
Answers
Answer:
D none of the above
Explanation:
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When an object moves in the direction of the force, work is done.
A woman stands in a boat at rest on a calm lake. She throws a 10 kg anchor off the front of the boat, which has a mass of 1,000 kg
What is the initial momentum of the anchor-boat system?
A)1,000 kg m/s
B)zero because both objects are at rest.
C)1,010 kg m/s
D)10,000 kg m/s
PLEASE HELP!! I don’t understand
Answers
Answer: B) zero because both objects are at rest
Explanation:
Given the following :
Mass of anchor = 10kg
Mass of boat = 1000kg
Note : both boay and anchor are at rest, this gives a Velocity of zero
The momentum of a body is given as the product of Mass and velocity, that is,
Momentum = mass × velocity
Initial Momentum of anchor-boat system =
(mass of boat× initial velocity of boat) + (mass of anchor × initial velocity of anchor)
Initial Velocities of boat and anchor = 0
Therefore,
Initial momentum = (1000 × 0) + (10 × 0)
Initial momentum = (0 + 0) = 0
This is ecause both objects are at rest.
need help asap, thank you !
In the absence of air resistance, a projectile launched at an angle of 33 above the horizontal will have the same range as a projectile launched at which of the following angles? O 38 O 57⁰ 0:45. 07
Answers
A projectile is launched at an angle of 33⁰ above the horizontal, then the projectile launched at an angle of 90 - 33 = 57⁰ will have the same range as the projectile launched at 33⁰. The correct option is (B) 57⁰.
In the absence of air resistance, a projectile launched at an angle of 33 above the horizontal will have the same range as a projectile launched at an angle of 57⁰.
The range of a projectile can be determined by using the range formula.
R = ((v^2 * sin(2θ))/g) Where
R is the range of the projectile,
v is the velocity of the projectile,
θ is the angle at which the projectile is launched, and
g is the acceleration due to gravity.
In the absence of air resistance,
the horizontal component of velocity of a projectile remains constant throughout the flight.
So, the range of a projectile depends only on its initial velocity and the angle at which it is launched.
If a projectile is launched at an angle θ,
the time of flight of the projectile can be calculated by using the following formula:
T = (2v * sin(θ))/g
The maximum height reached by the projectile is given by the formula:
H = (v^2 * sin^2(θ))/2gIf a projectile is launched at an angle θ, then the range of the projectile will be the same as the range of the projectile launched at an angle of (90 - θ).
So, if a projectile is launched at an angle of 33⁰ above the horizontal, then the projectile launched at an angle of 90 - 33 = 57⁰ will have the same range as the projectile launched at 33⁰.
Therefore, the correct option is (B) 57⁰.
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one reason that sibling relationships are thought to be so important is that siblings
Answers
Sibling relationships are thought to be so important because they often provide a lifelong source of emotional support and social learning.
Siblings are often the longest lasting relationships in a person's life, and they can provide a sense of emotional support throughout one's life. Siblings also play a significant role in social learning, as they provide a natural context for children to learn social skills such as conflict resolution, negotiation, and communication.
Additionally, siblings may share similar experiences and understandings due to their shared upbringing, which can lead to a strong bond. Overall, sibling relationships are thought to be important due to their potential for lifelong support and social learning.
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What is the mass,volume,density and relative density?
Answers
mass = 2.76 g
volume = 25.5 mL
density of the fluid = 2.5 g/mL
R. D = Density of fluid
Density of water
Density of water = 1g/mL
R. D = 2.5/1
R. D = 2.5
the
estimated age of the solar sysytem is 4558 million years, with N =
4.558, what is the value of the exponent, n?
Answers
The estimated age of the solar system is 4558 million years,
with N = 4.558.
The exponent n is a number that represents the power to which the base number is raised.
The exponential function is represented as xn, where x is the base and n is the exponent.
The question seeks to determine the value of n given N and the estimated age of the solar system.
The formula for calculating the value of n is:
N = 10n
Taking the logarithm of both sides, we get:
log(N) = log(10n)
Using the rule of logarithm, log(a^b) = b log(a), we can rewrite the equation as:
log(N) = n log(10)
Since log(10) = 1, we have:
n = log(N)
Substituting N with the estimated age of the solar system, we get:
n = log(4.558)
Using a calculator, we find that log(4.558) is approximately 0.6609.
the value of the exponent, n, is approximately 0.6609.
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a jet can travel at 350 m/s.
calculate how far it will travel in :
a) 30 secs
b) 5mins
c) half an hour
Answers
Explanation:
distance = speed x time
a- d= 350 m/s x 30s
d= 10500m
b- 5 mins = 300 sec
d= 350 m/s x 300s
d= 105000 m
c- 30 mins = 1800 sec
d= 350 m/s x 1800 s
d= 630000 m
helppp pls A rock rests on the ground. A force pulls the rock toward the earth, and another force pulls the rock toward the moon.
Why does the rock stay on the ground?
A. The force pulling the rock toward the earth is weaker than the force pulling the rock toward the moon.
B. The rock is moving, but it's not visible to the human eye.
C. Only one force can act on an object at one time.
D. The force pulling the rock toward the earth is greater than the force pulling the rock toward the moon.
Answers
Answer:
D. The force pulling the rock toward the earth is greater than the force pulling the rock toward the moon.
is an ocean wave electromagnetic or mechanical
Answers
Answer:
mechanical
Explanation:
the energy is carried by water <3 hope this helped
Two microphones are connected to a
computer. The microphones are held 2.0 m
apart. Harold rings a bell, and the computer
shows that it took the sound 0.0058 seconds
to travel from one microphone to the other.
What is the velocity of the sound wave?
Round your answer to one decimal place.
Answers
Answer:
344.8 m/s
Explanation:
Looking for speed of sound = meters / sec
2 meters / .0058 seconds = 344.8 m/s
The velocity of the sound wave is 344.8 meter/second.
What is sound?A sound is a vibration that travels as a mechanical wave across a medium. It can spread through a solid, a liquid, or a gas as the medium. Solids carry sound the quickest, liquids somewhat more slowly, and gases the least slowly.
According to physics, sound is described as a vibration that travels through a material like a gas, liquid, or solid as an audible wave of pressure.
Given parameters:
The microphones are held 2.0 m apart.
it took the sound 0.0058 seconds to travel from one microphone to the other.
Hence, the velocity of the sound wave is = distance travelled/time taken
= 2.0 meter / 0.0058 second
= 344.8276 meter/second.
Hence, the velocity of the sound wave is 344.8 meter/second ( after rounding answer to one decimal place.).
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HI can anybody tell me what newtons first law is pls don't make it sound too professional pls tyy
Answers
a girl stands 1.5 m in front of a plane mirror, what is the distance of her image,and what are four image characteristics
Answers
Answer:
the distance to the image is 1.5 m
Explanation:
To find the position of the image let's use the equation of the constructor
\(\frac{1}{f} = \frac{1}{p} + \frac{1}{q}\)
where p and q are the distance to the object and the image, respectively, and f is the focal length.
In this case a plane mirror has a focal length at infinity, if we substitute in the equation
1 / p = - 1 / q
q = -p
therefore the distance to the image is 1.5 m
this image has some characteristics:
* It is a virtual image, this means that light rays do not pass through it
* It is a right image, that is, the image is in the same direction of the object.
* the magnification is 1, since the height of the image and the object are the same
* has the right - left direction reversed
A 39 kg child sits in a 64 kg boat at rest, and throws a 4.8 kg package horizontally from the boat at a velocity of +13.7 m/s. What is the velocity of the boat after this?
Answers
Answer:
0.63 m/s
Explanation:
Given that,
Mass of a child = 39 kg
The mass of a boat =64 kg
The child throws a 4.8 kg package horizontally from the boat at a velocity of +13.7 m/s.
We need to find the velocity of the boat after the scenario. The momentum of the system will remain conserved. So,
+ ( + ) = 0
\(u=-\dfrac{ 4.8\times 13.7}{39+64}\\\\u=-0.63\ m/s\)
So, the velocity of the boat after this is 0.63 m/s.
You go to a dog park that is shaped like a rectangle. you walk into the park at the entrance in the northwest corner. the park is called the land of 133 puppies! that's a very specific name. you only see 16 puppies at the entrance. you walk 33.8 meters to the east to go to the puppy water fountain to see if you can find the other puppies. it is 3 o'clock in the afternoon and there are 21 puppies here. the fountain has a circumference of 6.71 meters. interesting. the one with with the black and white spots plays with a golf ball rolling down a ramp. you leave and walk 41.1 meters south to the puppy playground. there are 21 puppies running around and playing. there is a statue of a doggo that is 10.47 meters tall. wow. you hear excited yips to the west, so you walk 33.8 meters back to the western side of the park to find a puppy food truck! here, there are 98 puppies! the park is aptly named.
how much shorter would it have been to have gone straight to the puppy food truck from the entrance instead of the route you chose? (distance minus displacement)
Answers
The difference between the distance traveled and the displacement from the entrance to the puppy food truck is 108.7 meters.
How much shorter was the direct route to the puppy food truck from the entrance?To calculate the difference between the distance traveled and the displacement, we need to compare the total distance covered along the chosen route with the straight-line distance from the entrance to the puppy food truck. The distance traveled is the sum of the distances traveled in each direction, while the displacement is the straight-line distance between the starting and ending points.
By using the given information about the distances walked in each direction, we can determine the total distance covered. Subtracting the displacement from the distance traveled gives us the difference, which represents how much shorter the direct route would have been.
This calculation helps quantify the efficiency of the chosen route and provides an understanding of the potential time and effort saved by taking a more direct path.
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what are forces that two objects apply on each other
Answers
HOPE IT HELPED:) HAVE A NICE DAY
1. In a certain wire, 10 C of charge passes through it in 100 seconds. What is
the current in the wire?
Answers
Answer:
the correct answer is 10 wires
Explanation:
So you divide 10x the seconds then you know that 10x10 is 100 and then the answer becomes 10.
Someone please help me into what was the average speed for the entire trip thank you
Answers
From the position-time graph, we have the following:
Distance covered Time
0 to 28 m 0 to 20 seconds
28m to 52 m 20 to 60 seconds
At 52 m 60 to 80 seconds
52 to -20m 80 to 110 seconds
Let's find the average speed for the entire trip.
To find the average speed, apply the formula:
\(avg\text{ spe}ed=\frac{total\text{ distance}}{total\text{ time}}\)Distance at line 1: 28 - 0 = 28m
Distance at line 2: 52 - 28 = 24 m
Distance at line 3: 0 m
Distance at line 4: -20m - 52 = -72 m
Thus, we have the equation:
\(s=\frac{d_1}{t_1}+\frac{d_2}{t_2}+\frac{d_3}{t_3}+\frac{d_4}{t_4}\)Where:
d1 = 28 m
d2 = 24 m
d3 = 0 m
d4 = 72 m
t = 110 s
Now substitue values into the equation:
\(\begin{gathered} s=\frac{28}{20}+\frac{24}{40}+\frac{0}{20}+\frac{72}{30} \\ \\ s=4.4\text{ m/s} \end{gathered}\)Therefore, the average speed for the trip is 4.4 m/s.
ANSWER:
Equation:
\(s=\frac{d_1}{t_1}+\frac{d_2}{t_2}+\frac{d_3}{t_3}+\frac{d_4}{t_4}\)Substitution:
\(s=\frac{28}{20}+\frac{24}{40}+\frac{0}{20}+\frac{72}{30}\)Calculation:
\(\begin{gathered} s=1.4\text{ + }0.6\text{ + 0 + }2.4 \\ \\ s=4.4\text{ m/s} \end{gathered}\)7. What is the kinetic energy when the moving cart is 2/3 the way down (height=5 m) when the total mechanical energy is _____________
Please I need someone to help me with this?!
Answers
(a) The kinetic energy of the cart when it moves is 2/3 the way down is 1/3mgh.
(b) The total mechanical energy of the cart at the given height of 5 m is 5mg.
Potential energy of the cart
The potential energy of the cart when it is 2/3 way down the given height of 5 m is calculated as follows;
ΔP.E = mghf - mgh₀
ΔP.E = mg(hf - h₀)
ΔP.E = mg(2h/3 - h)
ΔP.E = -¹/₃mgh
Kinetic energy of the cartΔK.E = -ΔP.E
ΔK.E = ¹/₃mgh
Total mechanical energy of the cartM.A = P.E + K.E
M.A = ²/₃mgh + ¹/₃mgh
M.A = mgh
M.A = mg(5)
M.A = 5mg
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what applied horizontal force will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight?
Answers
Answer:
The applied horizontal force that will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight is 800 N.
Explanation:
The friction force is given by:
F_f = μmg
F_f = μmg = 0.5 * 400 kg * 9.8 m/s² = 1960 N
The net force on the crate is given by:
F_net = F_a - F_f
The net force is equal to the mass of the crate times its acceleration, so:
m * a = F_a - F_f
400 kg * 1 m/s² = F_a - 1960 N
F_a = 400 kg * 1 m/s² + 1960 N = 800 N
Therefore, the applied horizontal force that will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight is 800 N.
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43. What is precipitation hardening? 44. Diffusion is driven by two things, what are they? 45. Diffusion processes can be in two states, what are they? 46. Which Laws pertain to each type of Diffusion
Answers
43. Precipitation hardening is a heat treatment technique used to strengthen certain alloys by creating a fine dispersion of precipitates within the material, increasing its strength and hardness.
44. Diffusion is driven by two things: concentration gradient (difference in concentration) and temperature gradient (difference in temperature).
45. Diffusion processes can be in two states: Fickian diffusion and Non-Fickian diffusion.
46. Fick's first law and Fick's second law pertain to Fickian diffusion, which is the diffusion process governed by concentration gradients and follows Fick's laws.
Heat is a form of energy that is transferred between objects or systems due to temperature difference. It flows from hotter regions to colder regions until thermal equilibrium is reached. Heat can be transferred through conduction, or radiation. It is measured in units of joules (J) or calories (cal) and plays crucial role in thermodynamics and understanding thermal processes.
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7. A volcanic island arc is formed when
Answers
As the volume of a gas increases, its pressure
(Assume all other factors are held constant).
Answers
which object has the most kinetic energy a truck going 100 miles per hour or a motorcycle going 100 miles per hour
Answers
Answer:
The truck
Explanation:
Kinetic energy is directly proportional to mass. Since the truck has more mass, it will have more energy.
Using this circuit, find the Norton equivalent circuit about terminals a and b. Req and leq are the equivalent resistance and current used in the Norton's equivalent circuit. V1 = 10 V, 11 = 2A, R1 = 4 ohms, R2 = 8 ohms, R3 = 4 ohms R Marked out of 1 P Flag question a R2 1) + b Select one: a. leq = 0.2 A, Reg = 4 ohms b. leq = -0.2 A, Req = 6.66 ohms O c. leq = 0.2 A, Req = 6.66 ohms O d. leq = -0.2 Reg = 4 ohms
Answers
Ohms: According to the qusetion, the correct option is c. leq = 0.2 A, Req = 6.66 ohms.
What is ohms?Ohms is a measure of electrical resistance. It is named after the German physicist Georg Ohm, who discovered that the current through a conductor is directly proportional to the voltage applied to it. The ohm is the SI unit of electrical resistance and is denoted by the symbol Ω. It is the resistance between two points of a conductor when a constant potential difference of one volt is applied to it, resulting in a current of one ampere. The electrical resistance of an object is equal to the ratio of the voltage applied to the current that passes through it.
This can be found by using the current divider rule to find the current at each node.
Then, the Norton equivalent can be found by using the formula
Ieq = V/Req
Since V = 10V and Ieq = 0.2A,
Then Req = 10/0.2 = 6.66 ohms.
Therefore, according to the qusetion, the correct option is c. leq = 0.2 A, Req = 6.66 ohms.
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