Answer:
wave is in the y-direction, the wave is traveling in the
Explanation:
What is the final speed of a free electron accelerated from rest through a potential difference of -120 V? The mass of the electron is 9.11x10-31kg. You need to express the speed in km/s.
You should round your answer to an integer, indicate only the number, do not include the unit.
Answer:
The final speed of the electron is 6,497 km/s
Explanation:
Given;
mass of the electron, m = 9.11 x 10⁻³¹ kg
electron potential, V = -120 V
Apply work energy theorem;
¹/₂mv² = eV
Where;
v is the final speed of the electron
e is the charge of the electron, = 1.602 x 10⁻¹⁹ C
[tex]v = \sqrt{\frac{2eV}{m} }\\\\v = \sqrt{\frac{2(1.602*10^{-19})(120)}{9.11*10^{-31}} }\\\\v = 6496473.75 \ m/s\\\\v = 6,497 \ km/s[/tex]
Therefore, the final speed of the electron is 6,497 km/s
Question 4 of 10
How does the electric current of an AC generator differ from that of a DC
generator?
O A. It is much stronger.
OB. It flows through the permanent magnets.
C. It is much weaker.
D. It constantly reverses direction.
Answer:
D) it constantly reverses direction
Explanation:
Just took the test
A 1000kg car is moving with a speed of 20m/s. Determine the net work required to move the
vehicle to a speed of 30m/s?
Answer:
250,000 Joules
Explanation:
The work required is the amount of energy added, so the answer is the difference in kinetic energy before and after the acceleration of the car. (The problem doesn't say it's flat where the car is, but well assume it since there is no information about an elevation change that would require us to concern ourselves with potential energy!)
W = E_final - E_initial
= 1/2 m v_final^2 - 1/2 m v_initial^2
= 1/2 m (v_final^2 - v_initial^2)
= 1/2 (1000 kg) ( (30 m/s)^2 - (20 m/s^2) )
= 1/2 (1000 kg) (500 m^2/s^2)
= 250,000 kg m^2/s^2
= 250,000 Joules
A car traveling 13 m/s to the north collides with a car traveling 19 m/s to the
south. Each car has a mass of 1250 kg. If the system is defined as the two
cars, what is the change in momentum of the system due to the collision?
A. 0 kg*m/s
B. 40,000 kg*m/s
O c. 16,250 kg-m/s
D. 23,750 kg-m/s
Answer: 0kg(m/s)
Explanation:
how many significant figures does 1700000000 have ?
Answer:
2 sig
Explanation:
1 and 7
A particle moves along the x axis. It is initially at the position 0.180 m, moving with velocity 0.060 m/s and acceleration -0.380 m/s^2. Suppose it moves with constant acceleration for 3.80 s.
Required:
a. Find the position of the particle after this time.
b. Find its velocity at the end of this time interval.
Answer:
a
[tex]x_2 = -2.3356[/tex]
b
[tex]v = -1.384 \ m/s[/tex]
Explanation:
From the question we are told that
The initial position of the particle is [tex]x_1 = 0.180 \ m[/tex]
The initial velocity of the particle is [tex]u = 0.060 \ m/s[/tex]
The acceleration is [tex]a = -0.380 \ m/s^2[/tex]
The time duration is [tex]t = 3.80 \ s[/tex]
Generally from kinematic equation
[tex]v = u + at[/tex]
=> [tex]v = 0.060 + (-0.380 * 3.80)[/tex]
=> [tex]v = -1.384 \ m/s[/tex]
Generally from kinematic equation
[tex]v^2 = u^2 + 2as[/tex]
Here s is the distance covered by the particle, so
[tex](-1.384)^2 = (0.060)^2 + 2(-0.380)* s[/tex]
=> [tex]s = -2.5156 \ m[/tex]
Generally the final position of the particle is
[tex]x_2 = x_1 + s[/tex]
=> [tex]x_2 = 0.180 + (-2.5156)[/tex]
=> [tex]x_2 = -2.3356[/tex]
Which of the following scenarios best describes Newton's law of action-reaction?
F A bottle of soda sitting in the console of a vehicle appears to move left as the vehicle makes a sharp
right turn.
A rocket moves upward as the engine pushes downward against exhaust gases and the exhaust gases
push upward against the engine.
H
A train traveling 88 kilometers per hour takes approximately one mile to come to a complete stop.
J
An ice skater sharpens the blades of their skates to lessen the effect of friction.
A rocket moves upward as the engine pushes downward against exhaust gases and the exhaust gases push upward against the engine.
When I mix 200g of water at 10°C with 300g of water at 55°C, what is the final temperature of the mixture?
Answer:
4th of August is the
Explanation:
5th and then I can help out by getting
The second floor of a house is 6 m above the street level. How much work is required to lift a 300-kg refrigerator to the second-story level?
Answer:
Work done, W = 18 kJ
Explanation:
Given that,
The mass of a refrigerator, m = 300 kg
The second floor of a house is 6 m above the street level.
We need to find the work required to lift the refrigerator to the second-story level.
Work done, W = F × d
Putting all the values,
W = 300 × 10 × 6
W = 18000 J
or
W = 18 kJ
So, 18 kJ of work is done in lifting the refrigerator to the second-story level.
a. An object weighs 7.84 N when it is in air and 6.86 N when it is immersed in water. What is the specific gravity of the object?
b. How much pressure does it take for a pump to supply a drinking fountainwith 300 kPa, if the fountain is 30.0 m above the pump?
Answer:
a
[tex]W_s = 8[/tex]
b
[tex]P = 594 000 \ Pa[/tex]
Explanation:
Considering question a
From the question we are told that
The weight of the object in air is [tex]W_1 = 7.84 \ N[/tex]
The weight of the object in water is [tex]W_2 = 6.86\ N[/tex]
Generally the specific gravity of the object is mathematically represented as
[tex]W_s = \frac{W_1 }{W_1 - W_2 }[/tex]
=> [tex]W_s = \frac{7.84}{7.84 -6.86 }[/tex]
=> [tex]W_s = 8[/tex]
Considering question b
From the question we are told that
The pressure required is [tex]P_r = 300 \ kPa = 300 *10^{3} \ Pa[/tex]
The height is [tex]h = 30.0 \ m[/tex]
Generally the pressure require to get the water to the given height is mathematically represented as
[tex]P_h = \rho * g * h[/tex]
Here [tex]\rho[/tex] is the density of water with value [tex]\rho = 1000 \ kg / m^3[/tex]
So
[tex]P_h = 1000 * 9.8 * 30[/tex]
=> [tex]P_h = 294000 \ Pa[/tex]
Generally the pressure require to pump the water to the given height at the require pressure is mathematically represented as
[tex]P = P_h + P_r[/tex]
=> [tex]P = 294000 + 300*10^{3}[/tex]
=> [tex]P = 594 000 \ Pa[/tex]
An object is thrown straight down with an initial speed of 4 m/s from a window which is 8 m above the ground. Calculate: a) The time it takes the object to reach the ground b) Its velocity when it reaches the ground.
Answer:
0.41s
8.01m/s
Explanation:
Using the formula; v = u + at
Where;
u = initial velocity (m/s)
v = final velocity (m/s)
t = time (s)
a = acceleration (m/s²)
According to the provided information, u = 4m/s, s = 8m,
V = u + at
4 = 0 + 9.8t
4 = 9.8t
t = 0.41s
b) v = u + at
v = 4 + 9.8(0.41)
v = 4 + 4.018
v = 8.018m/s
Consider a polymer formed by a chain process. By how much does the kinetic chain length change if the concentration of initiator decreases by a factor of 10.0 and the concentration of monomer increases by a factor of 5.0?
how was the theory of plate tectonics developed?
Answer:
Plate tectonic theory began in 1915, when Alfred Wegener developed his "continental drift" idea. Wegener believed that continents plowed through ocean basin crust, explaining why many coasts (such as those in South America and Africa) appear to fit together like a puzzle.
1. Find the period of a tuning fork that vibrates 120 times/sec.?? I will give brainlest
Answer:
it the last one
Explanation:
Why do you think the objects in each collision experience a different change in velocity?
Answer:
In a collision, there is a collision force which endures for some amount of time to cause an impulse. This impulse acts upon the object to change its velocity and thus its momentum
You are currently getting 26 sales opportunities per day and closing 64% of them. How many sale opportunists per day?
Answer: 16
Explanation:
Which of the following is an example of Newton’s second law of motion?
A.....Catie’s skateboard hits a curb and she falls forward onto the grass.
B.....a tissue and a rock are dropped from a ladder. The rock exerts a greater force when it hits the ground.
C.....a person stands on a chair and pushes down, and the chair pushes upwards on
the person.
D......Tires from a bike push against the road, and the road pushes back.
Answer:
B
Explanation:
Newton’s Second Law of Motion
Newton’s Second Law of Motion states that ‘when an object is acted on by an outside force, the mass of the object equals the strength of the force times the resulting acceleration’.
This can be demonstrated dropping a rock or and tissue at the same time from a ladder. They fall at an equal rate—their acceleration is constant due to the force of gravity acting on them.
The rock's impact will be a much greater force when it hits the ground, because of its greater mass. If you drop the two objects into a dish of water, you can see how different the force of impact for each object was, based on the splash made in the water by each one.
Answer:
b
Explanation:
What is a physical combination of two or more substances that are blended together without forming a new substance?
Answer:
It is called a mixture.
Explanation:
A mixture is a physical combination of 2 or more substances that are blended together without forming a new substance.
what is the correct term for the people who came before us?
Answer:
Ancestors!
Explanation:
I know a thing or two~
Answer:
It depends on what the context is, if you mean people that came long before us you might be refering to ancestors, but if you mean people that came before us at any time then you would be refering to a predecessor.
Explanation:
A 72.0-kg person pushes on a small doorknob with a force of 5.00 N perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the frictionless hinges of the door. The door begins to rotate with an angular acceleration of 2.00 rad/s2, What is the moment of inertia of the door about the hinges? A) 2.74 kg m2 B) 1.88 kg m2 C) 0.684 kg m2 D) 4.28 kg m2 E) 7.52 kg m2
Answer:
[tex]I=2\ kgm^2[/tex]
Explanation:
Given that,
Mass of a person, m = 72 kg
Force acting on a doorknob, F = 5 N
The doorknob is located 0.800 m from axis of the frictionless hinges of the door.
The angular acceleration of the dor, a = 2 rad/s²
We need to find the moment of inertia of the door about the hinges.
The person applies a torque to the door and it is given by :
[tex]\tau=Fr[/tex] ...(1)
Also, the torque is equal to :
[tex]\tau=I\alpha[/tex] ...(2)
From equation (1) and (2) we get :
[tex]Fr=I\alpha[/tex]
I is the moment of inertia
[tex]I=\dfrac{Fr}{\alpha }\\\\I=\dfrac{5\times 0.8}{2}\\\\=2\ kgm^2[/tex]
So, the moment of inertia of the door about the hinges is [tex]2\ kgm^2[/tex].
Cars have safety features to protect people during a crash. A bumper is one type of safety feature. Which bumper design do
you think is safer?
a bumper that crumples
a bumper that's rigid
Answer:
Explanation:
second one ??? pls i hope im right
Answer:
A bumper that crumbles (plato)
Explanation:
What is inertia?
An object's tendency to move quicker
An object's tendency to change direction
An object's tendency to resist changes in motion
An unbalanced force on an object
Answer:
I think the answer should be an object's tendency to resist changes in motion.
Explanation:
Inertia is resistance of any physical object to any changes in its velocity.
Answer:
an object's tendency to resist changes in motion.
Explanation:
On a smooth horizontal floor, an object slides into a spring which is attached to another mass that is initially stationary. When the spring is most compressed, both objects are moving at the same speed. Ignoring friction, and considering the two masses and spring as a system, what is conserved during this interaction?A) momentum and potential energyB) kinetic energy onlyC) momentum and kinetic energyD) momentum onlyE) momentum and mechanical energy
Answer:
E) momentum and mechanical energy
Explanation:
In the context, an object is attached to the another mass with a spring which is initially at a rest position. Now when the spring is compressed, the two masses moves with the same speed. Now since the both the masses combines with the spring to move together they are considered as one system and in this case the momentum and the kinetic energy will be conserved.
The kinetic energy and momentum of the system after collision and the kinetic energy and momentum of the two masses before collision will be constant.
What is the definition of kepal law
Humpback whales sometimes catch fish by swimming rapidly in a circle, blowing a curtain of bubbles that confuses a school of fish and traps it in a small area, where the whales can easily catch and eat them. Suppose a 25,000-kg humpback whale swims at 2.0 m/s in a circle of radius 8.2 m. What centripetal force must the whale generate?
Answer:
1.2 x [tex]10^4[/tex] N
Explanation:
The centripetal force of a body moving in a circle is given by:
Centripetal force = [tex]\frac{Mv^2}{r}[/tex]
where M = mass of the object, v = velocity with which the object is moving, and r = radius of the circle.
In this case, M = 25,000 kg, v = 2.0 m/s, and r = 8.2 m. Hence;
Centripetal force generated by the whale = 25,000 x 2^2/8.2
= 12,195.12 N = 1.2 x [tex]10^4[/tex] N to two significant digits.
sandra wants to lower her body fat percentage which choices will help her reach her goal
Sandra can take to lower her body fat percentage to eat several, balanced, low-calorie meals throughout the day and to exercise regularly.
What is body fat?When we can't access food for a lengthy period of time, fat is a vital source of stored energy.
There are several steps Sandra can take to lower her body fat percentage:
Exercise regularly: Regular physical activity, such as cardiovascular exercise, resistance training, and high-intensity interval training (HIIT), can help increase muscle mass and reduce body fat.
Eat a healthy diet: Eating a balanced diet that includes plenty of fruits, vegetables, whole grains, lean proteins, and healthy fats can help Sandra maintain a calorie deficit, which is necessary for reducing body fat. Avoiding processed foods, added sugars, and excessive amounts of saturated and trans fats can also be beneficial.
Control portions: Paying attention to portion sizes can help Sandra avoid overeating and maintain a calorie deficit. She can also use tools like measuring cups and a food scale to help control portion sizes.
Stay hydrated: Drinking enough water can help Sandra maintain a healthy metabolism and reduce feelings of hunger.
Get enough sleep: Getting adequate sleep (7-9 hours per night) can help regulate hormones that impact metabolism and hunger, making it easier to maintain a calorie deficit and reduce body fat.
Learn more about body fats here:
https://brainly.com/question/1495805
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23)
What statement BEST describes a gas?
A)
Gases have definite shape and variable volume.
B)
Gases have variable shape and variable volume.
0
Gases have a definite shape and definite volume.
D)
Gases have a variable shape and definite volume.
Answer:
b
Explanation:
What total distance did this student travel?
Seems like some of your question is missin
Explanation:
At standard temperature and pressure, carbon dioxide has a density of 1.98 kg/m3. What volume does 1.70 kg of carbon dioxide occupy at standard temperature and pressure?
Answer:
volume= 0.85m^3Explanation:
The density of a substance is defined as the mass per unit volume of the substance, the unit is in kg/m^3 and it is represented by the greek letter rho
Step one:
given data
we are told that the density of Co2= 1.98 kg/m3
and the mass of Co2 is= 1.70 kg
we know the relation between mass, volume and density is
[tex]density=mass/volume[/tex]
make volume subject of formula we have
[tex]volume=mass/density[/tex]
substitute we have
[tex]volume=1.7/1.98\\\\volume= 0.85m^3[/tex]
Find the Acceleration of a car with the mass of 1200kg and a force of 11x10^3 N
Answer:
9.17 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{11 \times {10}^{3} }{1200} \\ = 9.16666...[/tex]
We have the final answer as
9.17 m/s²Hope this helps you