Which of the following describes acceleration?
1. An object speeding up
2. An object slowing down
3. An object changing direction
4. An object at rest
Group of answer choices
1 and 3
1, 2, and 3
1 and 2
1, 2, 3, and 4
Answers
Related Questions
List 3 ways that the asthenosphere is different from the lithosphere:
Answers
Has a lower density than the asthenosphere
Allows for conductive heat transfer
Asthenosphere: Asthenosphere is denser than the lithosphere
Allows for advective heat transfer
Many electrical appliances such as straightening irons, electric razors, and hair dryers come with warning tags not to use them while in the shower or
bathtub. How does wet skin make these appliances more dangerous?
Answers
It is important to always follow the warning labels on electrical appliances and avoid using them in wet conditions, such as in the shower or bathtub, to reduce the risk of electrical shock and potential injury.
Why are electrical appliances designed to be used in dry conditions?Electrical appliances are designed to be used in dry conditions, and when they come into contact with wet skin, it increases the risk of electrical shock. The presence of water, especially in a shower or bathtub, can provide a pathway for electricity to flow through your body, which can result in electrocution.
Water is an excellent conductor of electricity, and it can reduce the resistance in your body, making it easier for electrical current to pass through. When you are in a shower or bathtub, your skin becomes wet and thus reduces your body's resistance to electric current. This can increase the amount of current that flows through your body and can result in serious injury or death.
Additionally, electrical appliances that are not specifically designed for use in wet environments may not be insulated properly, which can increase the risk of electrical shock. Water can also damage the internal components of electrical appliances, leading to a malfunction that can cause an electrical shock.
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Which of these properties is the best measure of a star's brightness? (1 point)
O age
O size
O absolute magnitude
O apparent magnitude
Answers
Answer:
ABSOLUTE MAGNITUDE, C
Explanation:
Absolute magnitude is how bright the star is from a distance of 10 parsecs. Apparent magnitude is how bright the star appears from Earth, which can vary, because some stars may be farther or closer away. Age and size are not very accurate either. For example, at the end of their lifetimes, very big start may explode in a violent and bright supernova, and outshine the stars near them. As for size, as many stars several times smaller than the sun shine much brighter than it, making it inaccurate.
A car drives at a constant speed of 21 m/s around a circle of radius 100m. What is the centripetal acceleration of the car
Answers
The centripetal acceleration of the car driving at a constant speed of 21 m/s around a circle with a radius of 100 m is calculated to be 4.41\(m/s^2.\)
To find the centripetal acceleration of the car, we can use the formula:
a = \(v^2\) / r
where "a" represents the centripetal acceleration, "v" is the velocity of the car, and "r" is the radius of the circular path.
Given that the car drives at a constant speed of 21 m/s and the radius of the circle is 100 m, we can substitute these values into the formula to calculate the centripetal acceleration.
a = (21\(m/s)^2\)/ 100 m
a = 441 \(m^2/s^2\)/ 100 m
a = 4.41 \(m/s^2\)
Therefore, the centripetal acceleration of the car is 4.41\(m/s^2.\) This centripetal acceleration represents the inward acceleration that keeps the car moving in a circular path, and its magnitude is determined by the square of the velocity divided by the radius of the circle.
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A cricket starts at the 5 meter mark on a ruler. It jumps to the 10 meter mark. Then, it jumps back to the 6 meter mark. Calculate the cricket’s displacement.
Answers
We have that the cricket’s displacement is
\(D_t=9meters\)
From the Question we are told that
Start position 5 meter mark
It jumps to the 10 meter mark.
it jumps back to the 6 meter mark.
Generally the equation for cricket’s displacement. is mathematically given as
\(D_t=Initial +final(displacement)\\\\D_t=(10-5)+(10-6)\)
\(D_t=9meters\)
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A squirrel runs at a steady rate of 0.51 m/s in a circular path around a tree. If the squirrel's centripetal acceleration is 0.43 m/s 2 , what is the radius of the circle?
Answers
Answer:
0.84m
Explanation:
0.51+0.43=0.93
πr can be 22/7 or 3.14
radius is 2x2= 4
3.14 divide0.93divide 4
=0.84m/s
Answer:
0.605 m (approx.)
Explanation:
We know, given the radius and the circular velocity we can yield the centripetal acceleration using this equation,
\(a = \frac{v^2}{r}\)
From this equation, we can solve for \($r$\) like this,
\(r = \frac{v^2}{a}\\r = \frac{0.51^2}{0.43} m \\ = 0.605 m\)
A Stone was thrown horizontally at a speed of 5. 0m/s from the top of a cliff 78. 4 m high
A. How long does it take the stone to hit the bottom of the cliff
B. How far from the base of the cliff does the stone strike the ground
C. What are the horizontal and vertical components of velocity of the stone as it hits the ground
Answers
A. It takes about 4 seconds for the stone to hit the bottom of the cliff. B. The horizontal distance the stone strike the ground is 20 m. C. The horizontal and vertical components of velocity of the stone as it hits the ground is 5.0 m/s, and -39.24 m/s (downward) respectively.
A. The time it takes a stone to hit the bottom of the cliff can be determined using the kinematic equation for displacement:
`Δy = viyt + 1/2at²`,
where Δy is the vertical displacement, viy is the initial vertical velocity, a is the acceleration due to gravity, and t is time.The initial vertical velocity of the stone is zero since it was thrown horizontally. Therefore, we have:
Δy = 78.4 m and a = -9.81 m/s² (downward).
Substituting these values, we get:
78.4 m = 0 + 1/2(-9.81 m/s²)t²
t ≈ 4 seconds.
B. The horizontal distance traveled by the stone is given by the formula:
`d = vixt`,
where d is the horizontal distance, vix is the initial horizontal velocity, and t is time.
Since there is no horizontal acceleration acting on the stone, vix remains constant at 5.0 m/s.
Thus, we have: d = 5.0 m/s × 4 s = 20 m.
Therefore, the stone strikes the ground 20 meters from the base of the cliff.
C. The horizontal component of velocity remains constant at 5.0 m/s since there is no horizontal acceleration acting on the stone. The vertical component of velocity can be found using the kinematic equation:
`vf = vi + at`,
where vf is the final velocity, vi is the initial velocity, a is the acceleration, and t is time.
When the stone hits the ground, its final vertical velocity is -vfy (downward), and its initial vertical velocity is zero.
Substituting these values, we get:
-vfy = 0 + (-9.81 m/s²) × 4 s
vfy ≈ -39.24 m/s (downward).
Therefore, the horizontal component of velocity is 5.0 m/s, and the vertical component of velocity is -39.24 m/s (downward).
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I need help on these 2 questions please ???
Answers
How much energy is stored in a 55kg on the top of a 65 m building
Answers
The energy stored in a 55 kg object at the top of a 65 m building is 34,255 joules.
The energy stored in an object at a certain height is given by the formula:
Potential Energy (PE) = m * g * h
In the equation, mass (m) represents the mass of the object, gravitational acceleration (g) represents the acceleration due to gravity, and height (h) represents the vertical distance the object is elevated from the reference point.
Given:
Mass (m) = 55 kg
Height (h) = 65 m
Gravitational acceleration (g) = 9.8 m/s²
Substituting the given values into the formula:
PE = 55 kg * 9.8 m/s² * 65 m
PE = 34,255 joules (J)
Therefore, A 55 kilogram item at the top of a 65 m structure stores 34,255 joules of energy.
This energy is stored within the object and is a result of its elevated position. When the object is released or falls, this potential energy will be converted into kinetic energy as it accelerates downwards due to the force of gravity.
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A 3.5 m long frictionless pendulum of mass 2.0 kg is released from point A at an angle θ of 10 degrees. What is the speed of the pendulum at point D, half the height up to point E?
Answers
Answer:
5
Explanation:
melsun slemalawkew melsun asawkecn
If two people lift identical stacks of books the same distance and one person does the job twice as fast, which of the following has doubled?
-power
-work output
-work input
-efficiency
Answers
Answer:
Power
Explanation:
Power is defined as the rate of doing work with reference to the time spent and the formula is force multiplied by velocity.
In this case, if two people lift identical stacks of books the same distance and one person does the job twice as fast, then it means the velocity in the case is doubled which will also lead to an increase in the Power .
PowerExplanation:
The formula for power is Work divided by time taken, so P=W/T.
That case, involved power, since one of the people did work twice as fast, but, it was the same amount of work each person did, for the same distance (not exact distance, but usually the same)
a stone is dropped from the edge of a roof, and hits the ground with a velocity of -140 feet per second. how high (in feet) is the roof?
Answers
The height of the roof is approximately 74.4 feet.
To determine the height of the roof, we can use the equation of motion for a falling object. The equation is:
h = (1/2)gt^2 + v0t + h0
where:
h is the height of the object
g is the acceleration due to gravity (approximately 32.2 feet per second squared)
t is the time taken for the object to fall
v0 is the initial velocity of the object (which is -140 feet per second in this case)
h0 is the initial height of the object (which is the height of the roof in this case)
Since the stone is dropped, the initial velocity (v0) is 0 and the equation simplifies to:
h = (1/2)gt^2 + h0
The stone hits the ground with a velocity of -140 feet per second, which means its final velocity (vf) is also -140 feet per second. We can use this information to find the time it took for the stone to fall using the equation:
vf = gt
-140 = 32.2t
Now, solve for t:
t = -140 / 32.2
t ≈ 4.35 seconds
Substituting this value of t back into the equation, we can solve for h0:
h = (1/2)gt^2 + h0
0 = (1/2)(32.2)(4.35)^2 + h0
0 = 74.4 + h0
Solve for h0:
h0 = -74.4 feet
Therefore, the height of the roof is approximately 74.4 feet.
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the primitive (first) atmosphere of venus probably consisted of substantial amounts of
Answers
The primitive (first) atmosphere of Venus is believed to have consisted of substantial amounts of carbon dioxide (CO2). Venus is known for having a dense and predominantly carbon dioxide atmosphere, making it the planet with the highest concentration of CO2 in its atmosphere among the terrestrial planets in our solar system.
Studies and observations of Venus suggest that during its early history, volcanic activity released large amounts of carbon dioxide into the atmosphere. Over time, the buildup of carbon dioxide contributed to a greenhouse effect, trapping heat and causing Venus to experience a runaway greenhouse effect. This led to extreme surface temperatures and the formation of a thick atmosphere primarily composed of carbon dioxide.
Other minor components of Venus' primitive atmosphere may have included nitrogen, sulfur dioxide, water vapor, and traces of other gases. However, carbon dioxide is considered the most significant and abundant component in Venus' atmosphere, playing a crucial role in shaping its extreme climate and conditions.
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the earth is about 81 times as massive as the moon. suppose the earth and moon are 240,000 miles apart. if you were an astronaut between the earth and moon at what distance from the earth will the gravitational attraction on you from the two bodies be equal and opposite?
Answers
The distance from the earth is 216,000 miles.
Gravitational attraction:
The force of attraction between all masses in the universe especially the attraction of the earth's mass for bodies near its surface.
Let us assume that the mass of moon is M. Then the mass of earth is 81M. The distance from the earth is 240,000miles.
We have to calculate gravitational fields due to earth and moon at that point and equal it to zero.
Therefore we have:
GM/ (d-r)² = G81M/ r²
9(d -r) = r
r = 9d/10
Putting the value of d = 240,000, then we have:
r = 9 × 240,000/ 10
= 216000 miles
Therefore the distance from the earth is 216,000 miles.
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a ping-pong ball weighs 0.025 n. the ball is placed inside a cup that sits on top of a vertical spring. if the spring is compressed 0.055 m and released, the maximum height above the compressed position that the ball reaches is 2.84 m. assuming only conservative forces are applied to the ball, determine the spring constant. choose the right answer and justify it showing all your calculations.
Answers
The spring constant is 2.09 N/m.
To determine the spring constant, we can use the conservation of mechanical energy principle. When the spring is compressed, its potential energy is converted into gravitational potential energy when the ball reaches its maximum height. We can set up the equation:
(1/2) * k * x² = m * g * h
where k is the spring constant, x is the compression distance (0.055 m), m is the mass of the ball, g is the gravitational constant (9.81 m/s² ), and h is the maximum height (2.84 m). First, we need to find the mass of the ball:
0.025 N = m * 9.81 m/s²
m = 0.025 N / 9.81 m/s² = 0.00255 kg
Now we can substitute the values into the equation and solve for k:
(1/2) * k * (0.055 m)² = (0.00255 kg) * (9.81 m/s²) * (2.84 m)
k = (0.00255 kg * 9.81 m/s² * 2.84 m) / (0.5 * (0.055 m)²) = 2.09 N/m
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A Ferris wheel with a diameter
of 40 m makes one revolution
every 20 minutes. What is its
average speed in meter/min?
Answers
Answer:
6.3 m/min
Explanation:
Circumference of a circle = 2πr
r = D/2 = 40m/2 = 20m
C = 2π(20m) = 125.7 m
speed = distance/time = (125.7 m) / (20 min) = 6.3 m/min
El tren Lima la Orolla va a una velocidad de 10 km/h y de pronto aplica el freno por un derrumbe en la via. Si demora 18 segundos en detenerse ¿Qué distancia recorrerá hasta detenerse completamente?
Answers
Answer:
Distancia = 50.04 metros
Explanation:
Dados los siguientes datos;
Velocidad = 10 km/h
Tiempo = 18 segundos
Para encontrar la distancia;
Conversión:
10 km/h = 10 * 1000/3600 = 2.78 m/s
Distancia = velocidad * tiempo
Distancia = 2.78 * 18
Distancia = 50.04 metros
Por lo tanto, el tren viajaría 50.04 metros antes de detenerse por completo.
Answer:
yes
Explanation:
yes
At which point is cool air circulating beneath warm air?
A. 1
B. 2
C. 3
D. 4
Answers
Answer:
The answer is A
Explanation:
I took the quiz
The point where the cool air circulated beneath warm air is option A. 1
Cool air circulation:Cold air should be entered from the left and movement should be down. It can't be clouded with the rain. The entering of the warm air should not be from the right and moved up. Neither the warm air should be entered from the top left and then moved down with respect to the clouds. In this way, the point of the cool air circulation should be one.
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In a closed system, as kinetic energy increases, what happens to potential energy?
Answers
How exactly would I find the total amount of energy used for a 60 cm stomp rocket that weighs 13.874 g and was launched at 40 degrees for a total of 2.45 seconds?
I wasn't given the initial velocity or Initial speed.
Answers
Answer:
To find the total amount of energy used for a stomp rocket, we can consider the different forms of energy involved: potential energy, kinetic energy, and work done by external forces.
Potential Energy (PE):The potential energy is given by the formula PE = mgh, where m is the mass of the rocket, g is the acceleration due to gravity (approximately 9.8 m/s²), and h is the height the rocket reaches. Since the height is not provided in the question, we cannot calculate the potential energy without this information.
Kinetic Energy (KE):The kinetic energy is given by the formula KE = (1/2)mv², where m is the mass of the rocket and v is the velocity. Since the initial velocity is not provided, we cannot calculate the kinetic energy without this information.
Work Done by External Forces (W):The work done by external forces can be calculated using the formula W = Fd, where F is the force applied and d is the displacement. In the case of a stomp rocket, the external force comes from the stomp or launch mechanism. Without information about the force applied or the displacement, we cannot calculate the work done by external forces.
Unfortunately, without the initial velocity, initial speed, force applied, displacement, or height reached, it is not possible to calculate the total amount of energy used for the stomp rocket. Additional information would be required to perform the calculation.
In Pem Davidson Buck's Derailing Rebellion: Inventing White Privilege:
1. How was race constructed in the early days of colonization?
2. How was white privilege established?
In Domination and Subordination:
1. What does it mean to be in a double bind? Provide an example.
Answers
Answer:among
Explanation:r:among r:among r:among r:among r:among r:among r:among
A hockey player skates across a rink of length 75m in 8.9 seconds. What is the average speed of the hockey player? The hockey player is moving at a speed of 9.5 m/s. If it takes him 2 seconds to come to a stop under constant acceleration, how far does he travel while stopping?
Answers
The average velocity is given by
\(v=\frac{d}{t}\)Where d is the distance covered and t is the time taken.
For the given case, we have
d = 75 m
t = 8.9 s
\(v=\frac{d}{t}=\frac{75}{8.9}=8.43\; \frac{m}{s}\)Therefore, the average speed of the hockey player is 8.43 m/s
The hockey player is moving at a speed of 9.5 m/s.
Please help me I have physics tomorrow and im so confused
Answers
Answer:
trust the process
Explanation:
quadratic formula, use synthetic division also use the p-q method for the roots and factoring.
the perimeter of a rectangle is 28 inches if the width of the rectangle is 7 inches what is the length
Answers
it needs to b 20 characters so im adding all this extra stuff, its 4 tho
2x+4y
GCF for the polynomial
Answers
Answer:
\(\boxed{2}\)
Explanation:
The GCF is the greatest common factor of the polynomial.
\(2x = 1, \ 2, \ x\)
\(4y=1, \ 2, \ 4,\ y\)
The greatest common factor is 2.
George rides his bike to his friend’s house that is 5 kilometers from his house. If he rides his bike at an average speed of 15 km/h, how long will it take him to get to his friend’s house?
Answers
Answer:
The answer is 0.33 H!
Explanation:
•when there is no temperature difference between a substance and its surroundings, no net energy is transferred as heat
A.true
B.false
Answers
Answer:
A. True
Explanation:
It is true that when there is no temperature difference between a substance and its surrounding, no net energy is transferred as heat.
The term used for this is thermal equilibrium. Thermal equilibrium occurs when two substances or even places are at the same temperature.
For heat to flow a gradient must be set up. The gradient implies that one part is at a higher temperature than the other. So, the system then works till thermal equilibrium is attained. Heat generally moves from a hotter to a colder body. When both bodies are at even or equal temperature, then heat stops moving.Antonio reads in his lab directions that he needs to obtain 15ml of distilled water. which piece of lab equipment does antonio need in order to measure this?
Answers
Antonio will need a pipette to measure 15 ml of distilled water in a laboratory.
What is a pipette?A pipette is a laboratory equipment used in measuring liquids in little amounts. 15 ml is a small amount of liquid so a pipette is a better fit for such amount.
We can conclude that a pipette is a better instrument to measure 15 ml of distilled water.
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Can someone one help me please !!!
Answers
Answer:
Current in the circuit(I) = 0.5 ampere
Explanation:
Given:
Number of resistors = 2 (10 ohm each)
Series of resistors
EMF = 10 volt
Find:
Current in the circuit(I)
Computation:
Total resistance in series = R1 + R2
Total resistance in series = 10 + 10
Total resistance in series = 20 ohm
Current in the circuit(I) = EMF / Total resistance in series
Current in the circuit(I) = 10 / 20
Current in the circuit(I) = 0.5 ampere
a 66-kgkg skier starts from rest at the top of a 1200-mm-long trail which drops a total of 270 mm from top to bottom. at the bottom, the skier is moving 11 m/sm/s.
Answers
According to the given statement the skier's average speed is approximately 2.44 m/s.
The skier's initial position is at the top of a 1200 m long trail.
The trail drops a total of 270 m from top to bottom.
At the bottom of the trail, the skier is moving at a speed of 11 m/s.
To find the skier's initial velocity, we can use the equation v² = u² + 2as, where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the distance traveled.
In this case, the skier starts from rest (u = 0 m/s), so the equation simplifies to v² = 2as.
Given that the distance traveled is 270 m, and the final velocity is 11 m/s, we can substitute these values into the equation to solve for the initial velocity.
11² = 2 * a * 270.
Simplifying further, we get 121 = 540a.
Dividing both sides by 540, we find that a = 121/540.
Now, we can use the equation v = u + at to find the time it takes for the skier to reach the bottom of the trail.
Given that the final velocity is 11 m/s, the initial velocity is 0 m/s, and the acceleration is 121/540 m/s², we can substitute these values into the equation to solve for t.
11 = 0 + (121/540) * t.
Simplifying further, we get 11 = 121t/540.
Multiplying both sides by 540, we find that 5940 = 121t.
Dividing both sides by 121, we find that t = 5940/121.
Finally, we can calculate the skier's average speed by dividing the total distance traveled (270 m) by the total time taken (5940/121 s).
Average speed = distance / time = 270 / (5940/121) = 14520/5940 = 2.44 m/s.
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