Answer: 1440
Explanation: 2 hours is equal to 24 hours times 60 gets you your answer.
Equation: 24×60=?
If mass A is 1.0 kg, mass B is 5.0 kg, and the frictional pulley has a mass of 0.5 kg and a radius of 0.15 m, what is the velocity of A and B at 0.5 seconds?
a. A = 1.72 m/s, B = 0.22 m/s
c. A = 0.22 m/s, B = 1.72 m/s
b. A = 3.14 m/s, B = -3.14 m/s
d. A = -3.14 m/s, B = 3.14 m/s
Answer:
b. A = 3.14 m/s, B = -3.14 m/s
Explanation:
Assuming this refers to an Atwood machine, draw free body diagrams for each mass.
For mass A, there are two forces: tension T₁ pulling up and weight m₁g pulling down.
For mass B, there are two forces: tension T₂ pulling up and weight m₂g pulling down.
For the pulley, there are two torques: tension T₁r pulling counterclockwise and tension T₂r pulling clockwise.
Sum of forces on A in the +y direction:
∑F = ma
T₁ − m₁g = m₁a
T₁ = m₁g + m₁a
Sum of forces on B in the -y direction:
∑F = ma
m₂g − T₂ = m₂a
T₂ = m₂g − m₂a
Sum of torques on the pulley in the clockwise direction:
∑τ = Iα
T₂r − T₁r = (½ mr²) (a/r)
T₂ − T₁ = ½ ma
Substitute:
m₂g − m₂a − (m₁g + m₁a) = ½ ma
m₂g − m₂a − m₁g − m₁a = ½ ma
m₂g − m₁g = m₂a + m₁a + ½ ma
g (m₂ − m₁) = a (m₂ + m₁ + ½ m)
a = g (m₂ − m₁) / (m₂ + m₁ + ½ m)
a = (9.8 m/s²) (5.0 kg − 1.0 kg) / (5.0 kg + 1.0 kg + ½ (0.5 kg))
a = 6.272 m/s²
Given:
v₀ = 0 m/s
a = 6.272 m/s²
t = 0.5 s
Find: v
v = at + v₀
v = (6.272 m/s²) (0.5 s) + 0 m/s
v = 3.14 m/s
Therefore, mass A will rise at 3.14 m/s, and mass B will fall at 3.14 m/s.
iron is electroplated with------ to protect it from corrosion.
a) tin
b). copper
c) silver
d) chromium
Answer:
B) cooper
Explanation:
the Cooper will protect the iro from attack by reagents such as acid
I need help on these 2 questions please ???
What can you use to demonstrate that matter is made up of tiny particles?
~A hypothesis
~A decision
~A prediction
~A model
A model can be used to demonstrate that matter is made up of tiny particles (option D).
What is a model?A model is a simplified representation used to explain the workings of a real world system or event.
An atom is the smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.
This means that an atom is made up of smaller particles called subatomic particles.
However, a model is what can be used to demonstrate that matter is made up of tiny particles.
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1. A student is biking to school. She travels 0.7 km north, then realizes something has fallen out of her bag.
She travels 0.3 km south to retrieve her item. She then travels 0.4 mi north to arrive at school. The journey
takes her 15 min.
a. What is her total displacement?
b. What is her average velocity?
Explanation:
(a) Displacement of an object is the shortest path covered by it.
In this problem, a student is biking to school. She travels 0.7 km north, then realizes something has fallen out of her bag. She travels 0.3 km south to retrieve her item. She then travels 0.4 mi north to arrive at school.
0.4 miles = 0.64 km
displacement = 0.7-0.3+0.64 = 1.04 km
(b) Average velocity = total displacement/total time
t = 15 min = 0.25 hour
[tex]v=\dfrac{1.04\ km}{0.25\ h}\\\\v=4.16\ km/h[/tex]
Hence, this is the required solution.
If our solar system's Sun was half the mass as it is now, what would happen to the orbit of the Earth
Do you think it would be possible to get your maximum heart rate ? Why or why not
Answer:
Speaking hypothitically, since I dont have a lot of knowledge around this subject, but yes i think it's possible, and probably not as rare as one might think.
Explanation:
why do athletes stretch before the game??? and hii pls help
Answer:
to stretch their muscles so they don't strain or hurt themselves
Explanation:
hi!
Answer:
it's kinda like a warm up. they're getting their body ready for extreme physical activity.
Explanation:
hope it helps, and hi
Why is climate changing?
Answer:
because the seasons are changing?
Answer:
Climate is changing because we have seasons.
Explanation:
How can you turn off a magnetic field produced by an electrical current?
a By placing a material with strong magnetic properties inside the coil of a solenoid b By making a loop or coil in the wire c By increasing the current in the wire d By turning the electrical current off
Answer:By turning the electrical current off
Explanation:Trust me I took the test
Answer:
d) By turning the electrical current off
Explanation:
this is the only one that fits this situation because all of the other answers help improve the magnetic field.
why discharge does not take place at very low pressure
Answer:
read explanation
Explanation:
Due to this reason a gas (air) a conductor of electricity at low pressure. ... It is because when the gas is at very low pressure positive charged ions are not available to eject out the electron from the cathode hence the discharge current stops.No, vacuum cannot conduct electricity.
An atom with 5 protons 6neutrons.and 5 electrons has an atomic mass of_______amu
Answer:
5 + 6 = 11
You just add the protons and the neutrons and you get the atomic mass
How often does a 16-year-old need a medical evaluation from a doctor?
A.
once every 6 months
B.
once every 3 years
C.
once every 1 year
D.
once every 2 years
Please select the best answer from the choices provided.
A
B
C
D
Answer:
b
i just took the quiz
Answer:
The correct answer is B. once every 3 years
If (x + 8) is a factor of f(x), which of the following must be true?
Both x = -8 and x = 8 are roots of f(x).
Neither x = -8 nor x = 8 is a root of f(x).
f(-8) = 0
Of(8) = 0
?
Answer:
c <3.
Explanation:
trust me :D
Answer:
f(–8) = 0
Explanation:
just took the quiz
Why do we dream? What causes you to dream?
Answer:
you dream because
Explanation: you sleep
A. B. C. D.
-___________
4. Two scientists are experimenting with pure samples of isotope X, a highly radioactive substance. The first scientist has a sample with a mass of 20 grams. He
measures a half-life of 232 seconds. The second scientist has a sample of the same substance with a mass of 80 grams. What is the half-life that she is most likely
to measure?
A. 58 seconds
B.232 seconds
C.464 seconds
D. 928 seconds
Answer:
D
Explanation:
The substances are the exact same!
The half life should be the same too :)
A half life is how long it takes for a substance to break down and leave your system.
So for 20 grams, it goes away in 232 seconds, but for 80 grams, which is 4 times the amount, you would also multiply the half life by 4
I hope this is correct!
The half-life of the sample of isotope X of 80 grams is the same as that of the sample of 20 grams, that is, 232 seconds (option B).
To find the answer, we need to remember the definition of half-life.
The half-life ([tex]t_{1/2}[/tex]) of a radioactive substance is the time at which the initial amount of a substance (the number of disintegrations, mass, activity) decreases by half after it decays into another substance, due to the emission of radiation in the form of a particle (alpha, beta⁺, beta⁻) or energy (gamma-ray or X-ray).
Since the two scientists are experimenting with the same isotope X, the half-life of the sample is the same, regardless of its initial and final mass, so the half-life of the sample of 80 g is 232 seconds.
Therefore, the answer is option B (232 seconds).
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I hope it helps you!
Joe throws a ball straight down a 100 m building with a velocity of 5 m/s. How long does it take the ball to reach the ground?
Do the two cars ever have the same velocity at one instant of time? If so, between which two frames? Check all that apply. Check all that apply. Cars have the same velocity at one instant of time between dots 1 and 2. Cars have the same velocity at one instant of time between dots 2 and 3. Cars have the same velocity at one instant of time between dots 3 and 4. Cars have the same velocity at one instant of time between dots 4 and 5. Cars have the same velocity at one instant of time between dots 5 and 6. Cars never have the same velocity at one instant of time.
Answer:
Cars have the same velocity at one instant of time between dots 4 and 5.
Explanation:
after looking at the image it is visible that same distance is covered by both cars in the frame between 4 and 5
An object travels along a straight, horizontal surface with an initial speed of 2 ms. The position of the object as a function of time is given in the table. Which of the following graphs represents the object’s velocity as a function of time?
Answer:
The options are not provided, so i will answer in a general way.
We know that:
The movement is along a straight horizontal surface, then we have one-dimensional motion.
The speed is 2m/s
We want a graph of position vs time.
Now, remember the relation:
Distance = Speed*Time
Then we can write the position as a function of time as:
P(t) = 2m/s*t + P0
Where t is our variable, that represents time in seconds, and P0 is the position at time t = 0seconds, we can assume that this is zero.
Then the equation is:
P(t) = 2m/s*t
And the graph is something like:
The velocity of the object as function of time is given as, v = u + at
The given parameters;
initial velocity of the object, u = 2 m/s
The velocity of an object is defined as the change in the displacement of the object per change in time of the object's motion.
The final velocity of the object at any time, t, is given as;
v = u + at
where;
u is the initial velocity
a is the acceleration of the object
t is the time of motion
Thus, at every time (t), the velocity of the object will be the sum of the initial velocity and the product of the acceleration and time of motion.
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Under normal conditions, what color do we expect diamonds to be?
Looking at the examples below and select the change in matter that is an example of a physical change A Ice Melting B leaves changing color C starting a fire
Answer: Your answer will be A
Convert 0.0000004372896 to scientific notation.
459 ft/sec --> mi/hr
Answer:
?
Explanation:
what im not understanding do u need help?
How is friction reduced between an air hockey puck and the table?
Cause it's Corona Time
Why is the sky blue
A. It's lonely and sad
B. Gases and particles in Earth's atmosphere scatter sunlight in all directions
C. Because it absorbs all colors except blue
Answer:
B
Explanation:
Test
5. Gravitational and magnetic forces are examples of _______forces.
6_______are forces that are equal in magnitude but opposite in
direction
7.__________are forces that cause a change in the motion of an object.
8. The sum of all forces acting in an object is called________
9. If the forces in an object are balanced, the net force is________
10. If the forces in an object are unbalanced, the net force is________
Answer:
Explanation:
5.non contact force
6.balanced force
7.unbalanced force
8.net force
9.zero
10.is the difference between two forces
mark me as brainliest please
The correct terms for the question are listed below
.non contact force
balanced force
unbalanced force
net force
zero
is the difference between two forces
Gravitational as well as magnetic forces can be regarded as one of the examples of non contact forces.Balance forces can be regarded as a force equal in magnitude and the force I still opposite in direction
Unbalance forces can be regarded as a type of forces that is responsible for alterations in the motion of a particular object.Net force can be regarded as the summation of all forces that is acting in overall on a particular object In a case when a forces in an object are not balanced, then net force is becomes zero
Therefore, Net force give summation of all forces on an object.
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HELPPP!!!
Count the total number of atoms in SiO 2 :
A. 3
B. 4
C. 2
D. 5
E. 6
Answer:3
Explanation:
Answer:
I had this awhile ago if I'm not mistaking its A
Can someone help me please
Answer:
D
Explanation:
Because it is impossible for it to show the real depth of the ocean and how deep it is
A track star runs the first 500 meters of a race in only 75 seconds. What is the track
star's speed
Answer:
6.667 m/s
Explanation:
500 meters = 75 seconds
500 meters / 75 seconds = 6.667 m/s
