Many scientists do not believe in astrology because
The price at which a nations currency can be bought using another nations currency is known as
A. The rate of exchange
B.consumer advantage
C.globalization
D.currency trade
Answer:
A. The rate of exchange
Explanation:
Suppose you are an astronaut and you have been stationed on a distant planet. you would like to find the acceleration due to the gravitational force on this planet so you devise an experiment. you throw a rock up in the air with an initial velocity of 11 m/s and use a stopwatch to record the time it takes to hit the ground. if it takes 7.0 s for the rock to return to the same location from which it was released, what is the acceleration due to gravity on the planet?
Answer: g = -3.143 m/s²
Explanation: To determine acceleration due to the gravitational force, it can be used the following formula:
v = v₀ + gt, where:
v₀ is the initial velocity;
g is acceleration due to gravity
t is the time to return to the point of origin
When the rock return to the point of origin, there is no velocity, so v = 0.
The time to go up is the same to go down, so t = [tex]\frac{t}{2}[/tex] = [tex]\frac{7}{2}[/tex].
Substituing in the formula:
v = v₀ + gt
0 = 11 + g.[tex]\frac{7}{2}[/tex]
g = [tex]\frac{(0 - 11).2}{7}[/tex]
g = - 3.143
The acceleration due to the gravitational force is g = - 3.143 m/s².
A man stands on a scale in an elevator as shown here. the force of his weight when the elevator is still is fg downward. suppose the elevator's acceleration downward is 1/4 g. the weight of the man, fs, is what
The weight of the man in the elevator is [tex]\frac{3}{4} f_g[/tex].
What is weight?Weight of a body is the force with which the earth attracts it. due to having both magnitude and direction, Weight is a vector quantity. Si unit of weight is Newton.
Given parameter:
The force of his weight in still elevator is = [tex]f_g[/tex]
And, the elevator's acceleration downward is 1/4 g.
Let, the mass of the man is = m.
So, his weight in still elevator = [tex]f_g[/tex] = mg.
Where, g = acceleration due to the gravity.
When the elevator moves downward, the experienced weight of the man will change and magnitude of it will be equal to the difference of his weight in still elevator and pseudo force due to the elevator's acceleration downward is 1/4 g .
The pseudo force due to the elevator's acceleration = mass × acceleration
= m× 1/4 g
= 1/4 mg
Fs=m×g-m×1/4g=m×(g-1/4g)=m×3/4g
Now, the weight of the man experienced during the elevator's acceleration downward is 1/4 g is, [tex]f_s[/tex] = [tex]f_g -\frac{1}{4}[/tex]mg = 3/4 mg = [tex]\frac{3}{4}[/tex] [tex]f_g[/tex].
Hence, the net weight of the man is [tex]\frac{3}{4}[/tex] [tex]f_g[/tex].
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A fish swimming in a horizontal plane has velocity v with arrowi = (4.00 i + 1.00 j) m/s at a point in the ocean where the position relative to a certain rock is r with arrowi = (12.0 i − 2.00 j) m. after the fish swims with constant acceleration for 17.0 s, its velocity is v with arrow = (23.0 i − 1.00 j) m/s. (a) what are the components of the acceleration of the fish? ax = m/s2
Final answer:
To find the acceleration components of the fish, the change in velocity components is divided by the time interval. The x-component is 1.12 m/s² and the y-component is -0.12 m/s².
Explanation:
The student is asking how to calculate the components of acceleration given the initial and final velocity of a fish over a certain time period. To find the acceleration components, we use the formula a = (vf - vi) / t, where vf is the final velocity, vi is the initial velocity, and t is the time over which the change occurred. For the x-component: ax = (23.0 m/s - 4.00 m/s) / 17.0 s = 1.12 m/s². For the y-component: ay = (-1.00 m/s - 1.00 m/s) / 17.0 s = -0.12 m/s².
If the rectangular barge is 3.0 m by 20.0 m and sits 0.70 m deep in the harbor, how deep will it sit in the river?
The harbour contains salt water while the river contains fresh water. So assuming that the densities of fresh water and salt water are:
density (salt water) = 1029 kg / m^3
density (fresh water) = 1000 kg / m^3
The amount of water (in mass) displaced by the barge should be equal in two waters.
mass displaced (salt water) = mass displaced (fresh water)
Since mass is also the product of density and volume, therefore:
[density * volume]_salt water = [density * volume]_fresh water ---> 1
First we calculate the amount of volume displaced in the harbour (salt water):
V = 3.0 m * 20.0 m * 0.70 m
V = 42 m^3 of salt water
Plugging in the values into equation 1:
1029 kg / m^3 * 42 m^3 = 1000 kg/m^3 * Volume fresh water
Volume fresh water displaced = 43.218 m^3
Therefore the depth of the barge in the river is:
43.218 m^3 = 3.0 m * 20.0 m * h
h = 0.72 m (ANSWER)
Based on Archimedes' principle, the rectangular barge will sit at the same depth of 0.70m in both the harbor and the river, if the river and the harbor have the same type of water.
Explanation:The depth at which the rectangular barge will sit in the river relates to the concept of buoyancy and the principle of Archimedes. According to this principle, the weight of the water displaced by the barge is equal to the weight of the barge itself.
Provided that the river and the harbor have the same type of water (salt water or fresh water), the barge will sit at the same depth in both, which is 0.70m deep. This is because the barge, with dimensions of 3.0m by 20.0m, will displace an equal volume of water to balance its own weight in any body of water it is placed in.
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a speeding car traveling north at 80mph passes the tramway intersection when the police begin pursuit. The police start 6 miles south of tramway traveling at 100mph. How many miles north of tramway will they be when they catch up with the speeding car?
A proton is placed in an electric field of intensity 500 n/c what is the magnitude and direction of the acceleration of this proton due to this field
Calculate the magnitude and direction of the acceleration of a proton placed in an electric field of 500 N/C.
Magnitude of Acceleration: The magnitude of the acceleration of the proton can be calculated using Newton's second law, F = ma, where F is the force experienced by the proton in the electric field. Given that the electric field intensity is 500 N/C and the charge of a proton is 1.6 x 10^-19 C, you can find the acceleration.
Direction of Acceleration: The direction of the acceleration will be the same as the direction of the force experienced by the proton in the electric field, which is determined by the positive charge of the proton relative to the field lines.
The acceleration of a proton in a 500 N/C electric field is calculated using the charge of the proton and its mass, along with the given field intensity. The proton's charge is 1.60 x 10^-19 C, and its mass is 1.67 x 10^-27 kg. The proton accelerates in the same direction as the electric field.
To calculate the magnitude and direction of the acceleration of a proton in an electric field, we can use the formula for force F exerted on a charge q in an electric field E: F = qE. Next, we use Newton's second law of motion, which states that the force F on an object is equal to its mass m times its acceleration a: F = ma. Since the two expressions are both equal to the force F, we can set them equal to each other to find the acceleration: ma = qE. For a proton, the charge q is equal to the elementary charge, which is approximately 1.60 x 10-19 C. Hence, the acceleration a is found by rearranging the formula to a = qE/m.
The mass of a proton is approximately 1.67 x 10-27 kg. Substituting the given electric field intensity of 500 N/C, the charge of a proton, and the mass into the formula, we get:
a = (1.60 x 10-19 C) \\* (500 N/C) / (1.67 x 10-27 kg)
Calculating this, we get the acceleration a of the proton. Since the proton is positively charged, it will accelerate in the same direction as the electric field. This gives us both the magnitude of the acceleration and its direction.
Calculate the average velocity of the car for the time interval t=0 to t1 = 2.00 s .
Among all the given options, the correct option is option A. Distance, displacement, or acceleration can be used to describe motion.
What is average velocity?Physical quantity concepts like velocity, velocity, distance, displacement, or acceleration can be used to describe motion. Sir Isaac Newton provided the correct definition of motion. These quantities are all explained in terms of the same parameter, time.
The proportion of the total all quantities to the entire number of quantities is what is simply meant by the word "average." In Physics, an alternative strategy is used. Let's first define velocity precisely as well as speed and how the two are related before moving on to average velocity.
Total Displacement = Area under v-t graph
=πr²/2
=π×1²/2
=π/2m
Average velocity = Total Displacement / total time
= π/2/2 = π/4m/s
Therefore, the correct option is option A.
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A man swims at a speed of 0.4 m/s. How long will it take him to cross a pool of length 50 m?
Two objects are placed in thermal contact and are allowed to come to equilibrium in isolation. the heat capacity of object a is three times the heat capacity of object b and the initial temperature of object a (ta) is twice the initial temperature of object b (tb). 1) what will the final temperature of the two-object system be?
At thermal equilibrium, when the colder object has a higher heat capacity than the hotter object, the final temperature of the system will be closer to the initial temperature of the colder object.
Thermal Equilibrium of Two Objects
When two objects with different initial temperatures are placed in thermal contact and isolated from their surroundings, they will exchange heat until reaching thermal equilibrium. Specifically, the zeroth law of thermodynamics states that if two systems are in thermal contact and no heat flows between them, they are at the same temperature, implying they have reached thermal equilibrium.
The object with the higher heat capacity can absorb more heat without a significant increase in temperature.
The concept of thermal equilibrium in thermodynamics states that objects in contact will approach the same temperature, following the zeroth law of thermodynamics.
In the scenario, where the heat capacity of the colder object B is much greater than that of the hotter object A, and both objects are allowed to reach thermal equilibrium, the final temperature of the system will be closer to the initial temperature of object B, the colder object. This is because the object with the greater heat capacity will undergo a smaller change in temperature for the same amount of heat exchange, compared to the object with the smaller heat capacity.
PLEASE GO ANSWER MY 3 MOST RECENT QUESTION I NEED HELP!!!!!!!!!!!!!!
3. Compare how a positively charged object and a negatively charged object interact with a neutral object.
4. What happens to the composition of an atom to cause it to become positively or negatively charged?
5. If you rub a balloon on a piece of fabric or carpeting and then hold it against your head, your hair can stand on end. Use what you have learned in this lesson to explain why this happens
Starting from rest, a disk takes 8 revolutions to reach an angular velocity ω at constant angular acceleration. how many additional revolutions are required to reach an angular velocity of 3 ω ?
To find the additional revolutions required to reach an angular velocity of 3ω, we can use the equations of rotational motion.
Explanation:To find the solution to this problem, we can use the equations of rotational motion. The first step is to find the initial angular velocity, ω0. Given that the disk takes 8 revolutions to reach an angular velocity ω, we can calculate that ω0 = 2π * 8 / 8 = 2π rad/s.
Next, we can use the equation ω = ω0 + αt to find the angular acceleration, α. Rearranging the equation, we get α = (ω - ω0) / t = (3ω - 2π) / t.
Finally, we can use the equation ω = ω0 + αt to find the additional time, t', required to reach an angular velocity of 3ω. Rearranging the equation, we get t' = (3ω - ω0) / α = (3ω - 2π) / ((3ω - 2π) / t).
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With the switch closed, how does the voltage across the 20-ω resistor compare to the voltage across the 10-ω resistor?
Which energy conversion occurs in a battery-powered flashlight?
Answer: The correct answers are "chemical energy into electrical energy" and then "the electrical energy into light energy".
Explanation:
In the battery-powered flashlight, the battery supplies the chemical energy which makes the electrons to flow in the circuit and constitutes the current.
Then, the flashlight flashes the light in this way.
In the battery-powered flashlight, firstly, the chemical energy gets converted into electrical energy and then the electrical energy gets converted into light energy.
The roller-coaster car shown in fig. 6-41 (h1 = 45 m, h2 = 16 m, h3 = 26 m), is dragged up to point 1 where it is released from rest. assuming no friction, calculate the speed at points 2, 3, and 4.
There are many ways to solve this but I prefer to use the energy method. Calculate the potential energy using the point then from Potential Energy convert to Kinetic Energy at each points.
PE = KE
From the given points (h1 = 45, h2 = 16, h3 = 26)
Let’s use the formula:
v2= sqrt[2*Gravity*h1] where the gravity is equal to 9.81m/s2
v3= sqrt[2*Gravity*(h1 - h3 )] where the gravity is equal to 9.81m/s2
v4= sqrt[2*Gravity*(h1 – h2)] where the gravity is equal to 9.81m/s2
Solve for v2
v2= sqrt[2*Gravity*h1]
= √2*9.81m/s2*45m
v2= 29.71m/s
v3= sqrt[2*Gravity*(h1 - h3 )
=√2*9.81m/s2*(45-26)
=√2*9.81m/s2*19
v3=19.31m/s
v4= sqrt[2*Gravity*(h1 – h2)]
=√2*9.81m/s2*(45-16)
=√2*9.81m/s2*(29)
v4=23.85m/s
To calculate the speed at points 2, 3, and 4 of the roller-coaster car, we can use the principle of conservation of mechanical energy. At point 1, the car is released from rest, so its initial velocity is 0 m/s. Therefore, its potential energy at point 1 is equal to its total mechanical energy at point 1. Using the principle of conservation of mechanical energy again, we can find the speed at points 2, 3, and 4.
Explanation:To calculate the speed at points 2, 3, and 4 of the roller-coaster car, we can use the principle of conservation of mechanical energy. At point 1, the car is released from rest, so its initial velocity is 0 m/s. Therefore, its potential energy at point 1 is equal to its total mechanical energy at point 1:
Using the principle of conservation of mechanical energy again, we can find the speed at point 2:
Similarly, we can find the speed at point 3 using the same principle:
Finally, the speed at point 4 can be found:
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At what speed do a bicycle and its rider, with a combined mass of 100 kg , have the same momentum as a 1600 kg car traveling at 5.2 m/s ?
A steam engine absorbs 4 x 105 J and expels 3.5 x 105 J in each cycle. What is its efficiency?
100%
12.5%
75%
33%
Harry is reading an online summary of the law of reflection. The site states that after light hits a mirror, the angle of reflection is the angle between the reflected ray and the normal, which is the surface of the mirror.Which statement corrects an error on the site?
'A line perpendicular to the mirror's surface is called the normal. This is the right statement for correcting a website error.
What is the law of reflection?The law of reflection states that when a ray is reflected off a downy surface, the reflected ray's slope is equivalent to the incident ray's slope.
The incident ray and the reflected ray are always in the same plane as the incident ray and perpendicular to the surface at the incident ray's point of reference.
The angle of reflection is comparable to the angle of incidence when light rays fall on a flat surface, and the incident ray, reflected ray, and normal to the surface all lie in the same plane.
Hence 'A line perpendicular to the mirror's surface is called the normal. This is the right statement for correcting a website error.
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The current estimate for the age of earth of 4.57 ga comes from _____.
Which statement best describes the difference between acceleration and deceleration?
Deceleration is a type of acceleration where an object slows down, always acting opposite to the direction of motion. Negative acceleration, on the other hand, refers to acceleration in a negative direction as per the coordinate system and may not involve slowing down. Correctly distinguishing between these terms requires understanding both the motion's direction and the chosen coordinate system.
Explanation:The difference between acceleration and deceleration relates to the direction of the change in velocity relative to the object's current motion. While acceleration refers to a change in velocity, either in magnitude or direction, deceleration specifically refers to acceleration that occurs in the opposite direction of an object's motion and results in a reduction of the object's speed. It is a common misconception to equate deceleration with negative acceleration; although related, they are not always the same because negative acceleration refers to acceleration in a negative direction in the chosen coordinate system, which might not necessarily mean the object is slowing down.
Deceleration always reduces speed, whereas negative acceleration can occur when an object is speeding up in a direction defined as negative by a coordinate system. Therefore, deceleration is a form of acceleration that always acts in the opposite direction to the velocity, causing the object to slow down. On the other hand, negative acceleration is coordinate-dependent and may either represent an object slowing down or speeding up, depending on its initial direction of motion.
It is advisable to avoid the use of the term 'deceleration' when referring to negative acceleration, as one must also consider the sign of the object's velocity to determine if the object is slowing down.
Block A, with a mass of 4.0 kg, is moving with a speed of 2.0 m/s while block B , with a mass of 8.0 kg, is moving in the opposite direction with a speed of 3.0 m/s. The center of mass of the two block system is moving with velocity of?
We have that the velocity two block system is mathematically given as
vcm= -16 m/s
Velocity two block system
Question Parameters:
With a mass of 4.0 kg, is moving with a speed of 2.0 m/s while block B , with a mass of 8.0 kg, is moving in the opposite direction with a speed of 3.0 m/s.
Generally the equation for the Velocity is mathematically given as
vcm = (m1*v1) + (m2*v2)
vcm = ((4*2)-(8*3))
vcm= -16 m/s
And the direction is
dcm = in the direction of block B
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A metal smith pours 3.00 kg of lead shot at 99oc into 1.00 kg of water at 25oc in an isolated container. what is the final temperature of the mixture?
A piston has an external pressure of 15.0 atm. how much work has been done in joules if the cylinder goes from a volume of 0.150 liters to 0.640 liters?
In Physics, the work done on a system is calculated using the formula W = P∆V. Using a conversion factor to change atmospheres to Joules/liter, the total work done by the piston as the cylinder's volume changed was approximately 744.55 Joules.
Explanation:The work done on a system in physics is given by formula W = P∆V, where P is pressure and ∆V is the change in volume. Considering the conversion factor of 1 atm equaling 101.3 J/liter in this context, we apply this formula to find the work done. Given that the pressure equals 15.0 atm, which is equal to 1519.5 Joules per liter, and the change in volume equals 0.490 liters (0.640 liters - 0.150 liters), we multiply these values together to determine the work to be approximately 744.55 Joules.
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The pioneer in the technique of photographic collage was:
The correct answer is Raoul Hausmann. He was an Austrian artist and writer. And he was a forefather and dominant figure of the Dada movement in Berlin, who was known particularly for his ironic photomontages and his provocative writing on art. One of the important figures there also includes the experimental photographic collages, sound poetry and institutional reviews that has a profound influence on the European Avant-Garde in the aftereffects of World War I.
What force is exerted by the water on the window of an underwater vehicle at this depth if the window is circular and has a diameter of 35.0 cm?
To calculate the force exerted by the water on the window of an underwater vehicle at a certain depth, use the formula Force = Pressure x Area. Calculate the pressure using the formula Pressure = Density x Gravity x Depth. Calculate the area using the formula Area = π x (radius)^2.
Explanation:The force exerted by the water on the window of an underwater vehicle at a certain depth can be calculated using the formula:
Force = Pressure x Area
The pressure exerted by water at a given depth is given by the formula:
Pressure = Density x Gravity x Depth
Using the given diameter of the window, you can calculate the area of the window by using the formula for the area of a circle:
Area = π x (radius)^2
By substituting the values into the formulas and calculating, you can find the force exerted by the water on the window.
ben(55 kg) is standing on very slippery ice when junior(25kg) bumps into him. junior was moving at a speed of 8m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision .
If a flea can jump straight up to a height of 0.550 m , what is its initial speed as it leaves the ground?
Final answer:
The initial speed of a flea as it leaves the ground to reach a height of 0.550 meters is approximately 3.29 meters per second, calculated using the formula v = √{2gh}, where g is the acceleration due to gravity and h is the height.
Explanation:
The question asks us to find the initial speed of a flea as it leaves the ground to reach a height of 0.550 meters. To solve this, we can use the physics concept of kinematic equations, specifically the one that relates initial velocity, acceleration due to gravity, and maximum height achieved by a projectile. The formula we will use is: v = √{2gh}, where v is the initial velocity, g is the acceleration due to gravity (approximately 9.81 m/s²), and h is the maximum height (0.550 m).
Substituting the given values into the formula, we get:
v = √{2*9.81*0.550} = 3.29 m/s.
Therefore, the initial speed of the flea as it leaves the ground is approximately 3.29 meters per second.
A 100 N force pulls a box horizontally across a floor for 2 m. How much was done by the force of gravity (which pulls straight down on the box)?
The work done by the force of gravity will be 200 J.
What is work done?Work done is defined as the product of applied force and the distance through which the body is displaced on which the force is applied.
Work may be zero, positive and negative. it depends on the direction of the body displaced. if the body is displaced in the same direction of the force it will be positive.
The given data in the problem is;
F is the force applied = 100 N
d is the displacement = 2 m
W is the work done
The done by the force of gravity will be ;
W = F × d
W= 100 N × 2 m
W = 200 Nm
W = 200 J
Hence, the work done by the force of gravity will be 200 J.
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The ratio of the distance a bullet travels to the amount of time it takes to travel is known as the _____ of the bullet, depending on whether we need to know the direction or not.
Answer:
speed or velocity
Explanation:
The ratio of distance travels to the time taken is called speed.
Speed = distance traveled / time taken
Speed is a scalar quantity and its SI unit is m/s.
If the direction of distance given then it is velocity.
Velocity is defined as the ratio of displacement to the time taken.
Velocity is a vector quantity and its SI unit is m/s.